Advanced Monolithic Systems Inc wwwadvancedmonolithiccom Phone (925) 4430722 Fax (925) 4430723
Advanced AMS1117
Monolithic 1A LOW DROPOUT VOLTAGE REGULATOR
Systems
RoHs Compliant
FEATURES APPLICATIONS
•••• Three Terminal Adjustable or Fixed Voltages* •••• High Efficiency Linear Regulators
15V 18V 25V 285V 33V and 50V •••• Post Regulators for Switching Supplies
•••• Output Current of 1A •••• 5V to 33V Linear Regulator
•••• Operates Down to 1V Dropout •••• Battery Chargers
•••• Line Regulation 02 Max •••• Active SCSI Terminators
•••• Load Regulation 04 Max •••• Power Management for Notebook
•••• SOT223 TO252 and SO8 package available •••• Battery Powered Instrumentation
GENERAL DESCRIPTION
The The AMS1117 series of adjustable and fixed voltage regulators are designed to provide 1A output current and to operate down
to 1V inputtooutput differential The dropout voltage of the device is guaranteed maximum 13V at maximum output current
decreasing at lower load currents
Onchip trimming adjusts the reference voltage to 15 Current limit is also trimmed minimizing the stress under overload
conditions on both the regulator and power source circuitry
The AMS1117 devices are pin compatible with other threeterminal SCSI regulators and are offered in the low profile surface
mount SOT223 package in the 8L SOIC package and in the TO252 (DPAK) plastic package
ORDERING INFORMATION
PACKAGE TYPE OPERATING JUNCTION
TO252 SOT223 8L SOIC TEMPERATURE RANGE
AMS1117CD AMS1117 AMS1117CS 40 to 125 ° C
AMS1117CD15 AMS111715 AMS1117CS15 40 to 125 ° C
AMS1117CD18 AMS111718 AMS1117CS18 40 to 125 ° C
AMS1117CD25 AMS111725 AMS1117CS25 40 to 125 ° C
AMS1117CD285 AMS1117285 AMS1117CS285 40 to 125 ° C
AMS1117CD33 AMS111733 AMS1117CS33 40 to 125 ° C
AMS1117CD50 AMS111750 AMS1117CS50 40 to 125 ° C
*For additional available fixed voltages contact factory
PIN CONNECTIONS
3 PIN FIXEDADJUSTABLE
VERSION
1 GroundAdjust
2 VOUT
3 VIN
SOT223 Top View
1 2 3
8L SOIC Top View
1
2
8
4
3
7
5
6 VOUT
NC
VOUT
GNDADJ
VOUT
VOUT
NC
VIN
TAB IS
OUTPUT
TO252 FRONT VIEW
1
2
3
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AMS1117
ABSOLUTE MAXIMUM RATINGS (Note 1)
Power Dissipation Internally limited Soldering information
Input Voltage 15V Lead Temperature (25 sec) 265 °C
Operating Junction Temperature Range Thermal Resistance
Control Section 40°C to 125 °C SO8 package ϕ JA 160 °CW
Power Transistor 40 °C to 125 °C TO252 package ϕ JA 80 °CW
Storage temperature 65 °C to +150°C SOT223 package ϕ JA 90 °CW*
* With package soldering to copper area over backside
ground plane or internal power plane ϕ JA can vary from
46 °CW to >90 °CW depending on mounting technique and
the size of the copper area
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I OUT 0 mA and T J +25°C unless otherwise specified
Parameter
Device Conditions Min Typ Max Units
Reference Voltage
(Note 2)
AMS1117 IOUT 10 mA
15V ≤ (V IN VOUT) ≤ 12V
1232
12125
1250
1250
1268
12875
V
V
Output Voltage
(Note 2)
AMS111715 30V ≤ VIN ≤ 12V 1478
1455
1500
1500
1522
1545
V
V
AMS111718 33V ≤ VIN ≤ 12V 1773
1746
1800
1800
1827
1854
V
V
AMS111725 40V ≤ VIN ≤ 12V 2463
2425
2500
2500
2537
2575
V
V
AMS1117285 435V ≤ VIN ≤ 12V 2808
27645
2850
2850
2892
29355
V
V
AMS111733 475V ≤ VIN ≤ 12V 3251
3201
3300
3300
3349
3399
V
V
AMS111750 65V ≤ VIN ≤ 12V 4925
4850
5000
5000
5075
5150
V
V
Line Regulation AMS1117 15V ≤ (V IN VOUT) ≤ 12V 0015
0035
02
02
AMS111715 30V ≤ VIN ≤ 12V 03
06
5
6
mV
mV
AMS111718 33V ≤ VIN ≤ 12V 03
06
5
6
mV
mV
AMS111725 40V ≤ VIN ≤ 12V 03
06
6
6
mV
mV
AMS1117285 435V ≤ VIN ≤ 12V 03
06
6
6
mV
mV
AMS111733 475V ≤ VIN ≤ 12V 05
10
10
10
mV
mV
AMS111750 65V ≤ VIN ≤ 12V 05
10
10
10
mV
mV
Load Regulation
(Notes 2 3)
AMS1117 (VIN VOUT) 15V 10mA ≤ IOUT ≤ 1A 01
02
03
04
AMS111715 VIN 3V 0 ≤ IOUT ≤ 1A 3
6
10
20
mV
mV
AMS111718 VIN 33V 0 ≤ IOUT ≤ 1A 3
6
10
20
mV
mV
AMS111725 VIN 5V 0 ≤ IOUT ≤ 1A 3
6
12
20
mV
mV
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AMS1117
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I OUT 0 mA and T J +25°C unless otherwise specified
Parameter
Device Conditions Min Typ Max Units
Load Regulation
(Notes 2 3)
AMS1117285 VIN 435V 0 ≤ IOUT ≤ 1A 3
6
12
20
mV
mV
AMS111733 VIN 475V 0 ≤ IOUT ≤ 1A 3
7
15
25
mV
mV
AMS111750 VIN 65V 0 ≤ IOUT ≤ 1A 5
10
20
35
mV
mV
Dropout Voltage
(VIN VOUT)
AMS1117151825
2853350
∆VOUT ∆VREF 1 I OUT 1A (Note 4)
11 13
V
Current Limit
AMS1117151825
2853350
(VIN VOUT) 15V
900 1100 1500 mA
Minimum Load
Current
AMS1117 (V IN VOUT) 15V (Note 5) 5 10 mA
Quiescent Current AMS1117151825
2853350
(VIN VOUT) 15V
5
11
mA
Ripple Rejection AMS1117 f 120Hz C OUT 22 µF Tantalum I OUT 1A
(VINVOUT ) 3V C ADJ 10 µF
60 75 dB
AMS1117151825
285
f 120Hz C OUT 22 µF Tantalum I OUT 1A
VIN 435V
60
72
dB
AMS111733 f 120Hz C OUT 22 µF Tantalum I OUT 1A
VIN 475V
60 72
dB
AMS111750 f 120Hz C OUT 22 µF Tantalum I OUT 1A
VIN 65V
60 68
dB
Thermal Regulation AMS1117 TA 25°C 30ms pulse 0008 004 W
Adjust Pin Current AMS1117 IOUT 10mA 15V ≤ (V IN VOUT) ≤ 12V 55
120
µA
µA
Adjust Pin Current
Change
AMS1117 IOUT 10mA 15V ≤ (V IN VOUT) ≤ 12V 02
5
µA
Temperature Stability 05
Long Term Stability TA 125°C 1000Hrs 03 1
RMS Output Noise
( of V OUT )
TA 25°C 10Hz ≤ f ≤ 10kHz 0003
Thermal Resistance
JunctiontoCase
All packages
15 °CW
Parameters identified with boldface type apply over the full operating temperature range
Note 1 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur For guaranteed specifications and test conditions see the
Electrical Characteristics The guaranteed specifications apply only for the test conditions listed
Note 2 Line and Load regulation are guaranteed up to the maximum power dissipation of 12 W for SOT223 22W for TO252 and 780mW for 8Lead
SOIC Power dissipation is determined by the inputoutput differential and the output current Guaranteed maximum power dissipation will not be available
over the full inputoutput range
Note 3 See thermal regulation specifications for changes in output voltage due to heating effects Line and load regulation are measured at a constant
junction temperature by low duty cycle pulse testing Load regulation is measured at the output lead ~18 from the package
Note 4 Dropout voltage is specified over the full output current range of the device
Note 5 Minimum load current is defined as the minimum output current required to maintain regulation When 15V ≤ (V IN VOUT) ≤ 12V the device is
guaranteed to regulate if the output current is greater than 10mA
Advanced Monolithic Systems Inc wwwadvancedmonolithiccom Phone (925) 4430722 Fax (925) 4430723
AMS1117
APPLICATION HINTS
The AMS1117 series of adjustable and fixed regulators are easy to
use and are protected against short circuit and thermal overloads
Thermal protection circuitry will shutdown the regulator should
the junction temperature exceed 165 °C at the sense point
Pin compatible with older three terminal adjustable regulators
these devices offer the advantage of a lower dropout voltage more
precise reference tolerance and improved reference stability with
temperature
Stability
The circuit design used in the AMS1117 series requires the use of
an output capacitor as part of the device frequency compensation
The addition of 22 µF solid tantalum on the output will ensure
stability for all operating conditions
When the adjustment terminal is bypassed with a capacitor to
improve the ripple rejection the requirement for an output
capacitor increases The value of 22 µF tantalum covers all cases of
bypassing the adjustment terminal Without bypassing the
adjustment terminal smaller capacitors can be used with equally
good results
To further improve stability and transient response of these
devices larger values of output capacitor can be used
Protection Diodes
Unlike older regulators the AMS1117 family does not need any
protection diodes between the adjustment pin and the output and
from the output to the input to prevent overstressing the die
Internal resistors are limiting the internal current paths on the
AMS1117 adjustment pin therefore even with capacitors on the
adjustment pin no protection diode is needed to ensure device
safety under shortcircuit conditions
Diodes between the input and output are not usually needed
Microsecond surge currents of 50A to 100A can be handled by the
internal diode between the input and output pins of the device In
normal operations it is difficult to get those values of surge
currents even with the use of large output capacitances If high
value output capacitors are used such as 1000 µF to 5000 µF and
the input pin is instantaneously shorted to ground damage can
occur A diode from output to input is recommended when a
crowbar circuit at the input of the AMS1117 is used (Figure 1)
AMS1117
IN OUT
ADJ + COUT
22µ F
VOUT
R1
R2
CADJ
10 µF
D1
VIN
Figure 1
Output Voltage
The AMS1117 series develops a 125V reference voltage between
the output and the adjust terminal Placing a resistor between these
two terminals causes a constant current to flow through R1 and
down through R2 to set the overall output voltage This current is
normally the specified minimum load current of 10mA Because
IADJ is very small and constant it represents a small error and it
can usually be ignored
AMS1117
IN OUT
ADJ R1
R2
VOUT
VREF
VIN
IADJ
50 µA
VOUT V REF (1+ R2R1)+I ADJ R2
Figure 2 Basic Adjustable Regulator
Load Regulation
True remote load sensing it is not possible to provide because the
AMS1117 is a three terminal device The resistance of the wire
connecting the regulator to the load will limit the load regulation
The data sheet specification for load regulation is measured at the
bottom of the package Negative side sensing is a true Kelvin
connection with the bottom of the output divider returned to the
negative side of the load
The best load regulation is obtained when the top of the resistor
divider R1 is connected directly to the case not to the load If R1
were connected to the load the effective resistance between the
regulator and the load would be
RP x ( R2+R1 ) R P Parasitic Line Resistance
R1
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AMS1117
APPLICATION HINTS
Connected as shown R P is not multiplied by the divider ratio
AMS1117
IN OUT
ADJ
RLR1*
R2*
VIN
RP
PARASITIC
LINE RESISTANCE
*CONNECT R1 TO CASE
CONNECT R2 TO LOAD
Figure 3 Connections for Best Load Regulation
In the case of fixed voltage devices the top of R1 is connected
Kelvin internally and the ground pin can be used for negative side
sensing
Thermal Considerations
The AMS1117 series have internal power and thermal limiting
circuitry designed to protect the device under overload conditions
However maximum junction temperature ratings of 125°C should
not be exceeded under continuous normal load conditions
Careful consideration must be given to all sources of thermal
resistance from junction to ambient For the surface mount
package SOT223 additional heat sources mounted near the device
must be considered The heat dissipation capability of the PC
board and its copper traces is used as a heat sink for the device
The thermal resistance from the junction to the tab for the
AMS1117 is 15 °CW Thermal resistance from tab to ambient can
be as low as 30 °CW
The total thermal resistance from junction to ambient can be as
low as 45 °CW This requires a reasonable sized PC board with at
least on layer of copper to spread the heat across the board and
couple it into the surrounding air
Experiments have shown that the heat spreading copper layer does
not need to be electrically connected to the tab of the device The
PC material can be very effective at transmitting heat between the
pad area attached to the pad of the device and a ground plane
layer either inside or on the opposite side of the board Although
the actual thermal resistance of the PC material is high the
LengthArea ratio of the thermal resistance between layers is
small The data in Table 1 was taken using 116 FR4 board with
1 oz copper foil and it can be used as a rough guideline for
estimating thermal resistance
For each application the thermal resistance will be affected by
thermal interactions with other components on the board To
determine the actual value some experimentation will be
necessary
The power dissipation of the AMS1117 is equal to
PD ( V IN VOUT )( I OUT )
Maximum junction temperature will be equal to
TJ T A(MAX) + P D(Thermal Resistance (junctiontoambient))
Maximum junction temperature must not exceed 125 °C
Ripple Rejection
The ripple rejection values are measured with the adjustment pin
bypassed The impedance of the adjust pin capacitor at the ripple
frequency should be less than the value of R1 (normally 100 Ω to
200 Ω) for a proper bypassing and ripple rejection approaching the
values shown The size of the required adjust pin capacitor is a
function of the input ripple frequency If R1100 Ω at 120Hz the
adjust pin capacitor should be >13 µF At 10kHz only 016 µF is
needed
The ripple rejection will be a function of output voltage in circuits
without an adjust pin bypass capacitor The output ripple will
increase directly as a ratio of the output voltage to the reference
voltage (V OUT V REF )
Table 1
COPPER AREA THERMAL RESISTANCE
TOP SIDE* BACK SIDE BOARD AREA (JUNCTIONTOAMBIENT)
2500 Sq mm 2500 Sq mm 2500 Sq mm 55°CW
1000 Sq mm 2500 Sq mm 2500 Sq mm 55°CW
225 Sq mm 2500 Sq mm 2500 Sq mm 65 °CW
100 Sq mm 2500 Sq mm 2500 Sq mm 80 °CW
1000 Sq mm 1000 Sq mm 1000 Sq mm 60 °CW
1000 Sq mm 0 1000 Sq mm 65°CW
* Tab of device attached to topside copper
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AMS1117
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Operating Current
(Adjustable Device) ShortCircuit Current
Load Regulation Ripple Rejection vs Current
Adjust Pin CurrentTemperature Stability
0 5 10 15 20
0
3
6
9
12
INPUTOUTPUT DIFFERENTIAL (V)
0 5 10 15
MINIMUM OPERATING CURRENT (mA)
INPUTOUTPUT DIFFERENTIAL
0
025
050
075
100
125
SHORT CIRCUIT CURRENT (A)
50 25 0 25 50 75 100 125
020
015
010
005
0
005
010
TEMPERATURE (°C)
OUTPUT VOLTAGE DEVIATION ()
0 025 05 075 10
0
10
20
30
40
50
60
70
80
90
100
OUTPUT CURRENT (A)
RIPPLE REJECTION (dB)
50 25 0 25 50 75 100 125 150
20
10
0
10
20
TEMPERATURE (°C)
OUTPUT VOLTAGE CHANGE ()
TEMPERATURE (°C)
50 25 0 25 50 75 100 125 150
0
10
20
30
40
50
60
70
80
90
100
ADJUST PIN CURRENT (
µ
A)
TJ 125°C
TJ 25°C
f RIPPLE 120Hz
f RIPPLE 20Hz
VRIPPLE ≤3Vpp
VRIPPLE ≤05Vpp
∆ I LOAD 1A
VOUT 5V
CADJ 25 µF
COUT 25 µF
TJ 125°C
TJ 25°C
Advanced Monolithic Systems Inc wwwadvancedmonolithiccom Phone (925) 4430722 Fax (925) 4430723
AMS1117
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted
TO252 PLASTIC PACKAGE (D)
0030
(0762)
TYP
00870094
(221239) 00180023
(046058)
0020±0002
(0510±00508)
00180023
(046058) D (D3) AMS DRW# 011601
00350050
(089127)
00350045
(089114)
02350245
(59696223)
01560204
(396518)
02550265
(648673)
02060214
(523544)
0025
(0635)
TYP
70°
03800410
(9651041)
00450060
(114152)
3 LEAD SOT223 PLASTIC PACKAGE
01300146
(330371)
02480264
(630671)
01160124
(295315)
02640287
(671729)
0090
(229)
NOM
0071
(180)
MAX
00330041
(084104)
00250033
(064084)
0181
(460)
NOM
0012
(031)
MIN
00250033
(064084)
10°
MAX
10°16°
10°16°
00100014
(025036)
(SOT223 ) AMS DRW# 042292Advanced Monolithic Systems Inc wwwadvancedmonolithiccom Phone (925) 4430722 Fax (925) 4430723
AMS1117
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued)
8 LEAD SOIC PLASTIC PACKAGE (S)
0°8° TYP
00100020
(02540508)
S (SO8 ) AMS DRW# 042293
x 45°
00160050
(04061270)
00080010
(02030254)
00040010
(01010254)
00140019
(03550483)
00530069
(13461752)
0050
(1270)
TYP
01500157**
(38103988)
02280244
(57916197)
01890197*
(48015004)
*DIMENSION DOES NOT INCLUDE MOLD FLASH MOLD FLASH
SHALL NOT EXCEED 0006 (0152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH INTERLEAD
FLASH SHALL NOT EXCEED 0010 (0254mm) PER SIDE
1 2 3 4
8 7 6 5
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Advanced AMS1117
Monolithic 1A LOW DROPOUT VOLTAGE REGULATOR
Systems
RoHs Compliant
FEATURES APPLICATIONS
•••• Three Terminal Adjustable or Fixed Voltages* •••• High Efficiency Linear Regulators
15V 18V 25V 285V 33V and 50V •••• Post Regulators for Switching Supplies
•••• Output Current of 1A •••• 5V to 33V Linear Regulator
•••• Operates Down to 1V Dropout •••• Battery Chargers
•••• Line Regulation 02 Max •••• Active SCSI Terminators
•••• Load Regulation 04 Max •••• Power Management for Notebook
•••• SOT223 TO252 and SO8 package available •••• Battery Powered Instrumentation
GENERAL DESCRIPTION
The The AMS1117 series of adjustable and fixed voltage regulators are designed to provide 1A output current and to operate down
to 1V inputtooutput differential The dropout voltage of the device is guaranteed maximum 13V at maximum output current
decreasing at lower load currents
Onchip trimming adjusts the reference voltage to 15 Current limit is also trimmed minimizing the stress under overload
conditions on both the regulator and power source circuitry
The AMS1117 devices are pin compatible with other threeterminal SCSI regulators and are offered in the low profile surface
mount SOT223 package in the 8L SOIC package and in the TO252 (DPAK) plastic package
ORDERING INFORMATION
PACKAGE TYPE OPERATING JUNCTION
TO252 SOT223 8L SOIC TEMPERATURE RANGE
AMS1117CD AMS1117 AMS1117CS 40 to 125 ° C
AMS1117CD15 AMS111715 AMS1117CS15 40 to 125 ° C
AMS1117CD18 AMS111718 AMS1117CS18 40 to 125 ° C
AMS1117CD25 AMS111725 AMS1117CS25 40 to 125 ° C
AMS1117CD285 AMS1117285 AMS1117CS285 40 to 125 ° C
AMS1117CD33 AMS111733 AMS1117CS33 40 to 125 ° C
AMS1117CD50 AMS111750 AMS1117CS50 40 to 125 ° C
*For additional available fixed voltages contact factory
PIN CONNECTIONS
3 PIN FIXEDADJUSTABLE
VERSION
1 GroundAdjust
2 VOUT
3 VIN
SOT223 Top View
1 2 3
8L SOIC Top View
1
2
8
4
3
7
5
6 VOUT
NC
VOUT
GNDADJ
VOUT
VOUT
NC
VIN
TAB IS
OUTPUT
TO252 FRONT VIEW
1
2
3
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AMS1117
ABSOLUTE MAXIMUM RATINGS (Note 1)
Power Dissipation Internally limited Soldering information
Input Voltage 15V Lead Temperature (25 sec) 265 °C
Operating Junction Temperature Range Thermal Resistance
Control Section 40°C to 125 °C SO8 package ϕ JA 160 °CW
Power Transistor 40 °C to 125 °C TO252 package ϕ JA 80 °CW
Storage temperature 65 °C to +150°C SOT223 package ϕ JA 90 °CW*
* With package soldering to copper area over backside
ground plane or internal power plane ϕ JA can vary from
46 °CW to >90 °CW depending on mounting technique and
the size of the copper area
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I OUT 0 mA and T J +25°C unless otherwise specified
Parameter
Device Conditions Min Typ Max Units
Reference Voltage
(Note 2)
AMS1117 IOUT 10 mA
15V ≤ (V IN VOUT) ≤ 12V
1232
12125
1250
1250
1268
12875
V
V
Output Voltage
(Note 2)
AMS111715 30V ≤ VIN ≤ 12V 1478
1455
1500
1500
1522
1545
V
V
AMS111718 33V ≤ VIN ≤ 12V 1773
1746
1800
1800
1827
1854
V
V
AMS111725 40V ≤ VIN ≤ 12V 2463
2425
2500
2500
2537
2575
V
V
AMS1117285 435V ≤ VIN ≤ 12V 2808
27645
2850
2850
2892
29355
V
V
AMS111733 475V ≤ VIN ≤ 12V 3251
3201
3300
3300
3349
3399
V
V
AMS111750 65V ≤ VIN ≤ 12V 4925
4850
5000
5000
5075
5150
V
V
Line Regulation AMS1117 15V ≤ (V IN VOUT) ≤ 12V 0015
0035
02
02
AMS111715 30V ≤ VIN ≤ 12V 03
06
5
6
mV
mV
AMS111718 33V ≤ VIN ≤ 12V 03
06
5
6
mV
mV
AMS111725 40V ≤ VIN ≤ 12V 03
06
6
6
mV
mV
AMS1117285 435V ≤ VIN ≤ 12V 03
06
6
6
mV
mV
AMS111733 475V ≤ VIN ≤ 12V 05
10
10
10
mV
mV
AMS111750 65V ≤ VIN ≤ 12V 05
10
10
10
mV
mV
Load Regulation
(Notes 2 3)
AMS1117 (VIN VOUT) 15V 10mA ≤ IOUT ≤ 1A 01
02
03
04
AMS111715 VIN 3V 0 ≤ IOUT ≤ 1A 3
6
10
20
mV
mV
AMS111718 VIN 33V 0 ≤ IOUT ≤ 1A 3
6
10
20
mV
mV
AMS111725 VIN 5V 0 ≤ IOUT ≤ 1A 3
6
12
20
mV
mV
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AMS1117
ELECTRICAL CHARACTERISTICS
Electrical Characteristics at I OUT 0 mA and T J +25°C unless otherwise specified
Parameter
Device Conditions Min Typ Max Units
Load Regulation
(Notes 2 3)
AMS1117285 VIN 435V 0 ≤ IOUT ≤ 1A 3
6
12
20
mV
mV
AMS111733 VIN 475V 0 ≤ IOUT ≤ 1A 3
7
15
25
mV
mV
AMS111750 VIN 65V 0 ≤ IOUT ≤ 1A 5
10
20
35
mV
mV
Dropout Voltage
(VIN VOUT)
AMS1117151825
2853350
∆VOUT ∆VREF 1 I OUT 1A (Note 4)
11 13
V
Current Limit
AMS1117151825
2853350
(VIN VOUT) 15V
900 1100 1500 mA
Minimum Load
Current
AMS1117 (V IN VOUT) 15V (Note 5) 5 10 mA
Quiescent Current AMS1117151825
2853350
(VIN VOUT) 15V
5
11
mA
Ripple Rejection AMS1117 f 120Hz C OUT 22 µF Tantalum I OUT 1A
(VINVOUT ) 3V C ADJ 10 µF
60 75 dB
AMS1117151825
285
f 120Hz C OUT 22 µF Tantalum I OUT 1A
VIN 435V
60
72
dB
AMS111733 f 120Hz C OUT 22 µF Tantalum I OUT 1A
VIN 475V
60 72
dB
AMS111750 f 120Hz C OUT 22 µF Tantalum I OUT 1A
VIN 65V
60 68
dB
Thermal Regulation AMS1117 TA 25°C 30ms pulse 0008 004 W
Adjust Pin Current AMS1117 IOUT 10mA 15V ≤ (V IN VOUT) ≤ 12V 55
120
µA
µA
Adjust Pin Current
Change
AMS1117 IOUT 10mA 15V ≤ (V IN VOUT) ≤ 12V 02
5
µA
Temperature Stability 05
Long Term Stability TA 125°C 1000Hrs 03 1
RMS Output Noise
( of V OUT )
TA 25°C 10Hz ≤ f ≤ 10kHz 0003
Thermal Resistance
JunctiontoCase
All packages
15 °CW
Parameters identified with boldface type apply over the full operating temperature range
Note 1 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur For guaranteed specifications and test conditions see the
Electrical Characteristics The guaranteed specifications apply only for the test conditions listed
Note 2 Line and Load regulation are guaranteed up to the maximum power dissipation of 12 W for SOT223 22W for TO252 and 780mW for 8Lead
SOIC Power dissipation is determined by the inputoutput differential and the output current Guaranteed maximum power dissipation will not be available
over the full inputoutput range
Note 3 See thermal regulation specifications for changes in output voltage due to heating effects Line and load regulation are measured at a constant
junction temperature by low duty cycle pulse testing Load regulation is measured at the output lead ~18 from the package
Note 4 Dropout voltage is specified over the full output current range of the device
Note 5 Minimum load current is defined as the minimum output current required to maintain regulation When 15V ≤ (V IN VOUT) ≤ 12V the device is
guaranteed to regulate if the output current is greater than 10mA
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AMS1117
APPLICATION HINTS
The AMS1117 series of adjustable and fixed regulators are easy to
use and are protected against short circuit and thermal overloads
Thermal protection circuitry will shutdown the regulator should
the junction temperature exceed 165 °C at the sense point
Pin compatible with older three terminal adjustable regulators
these devices offer the advantage of a lower dropout voltage more
precise reference tolerance and improved reference stability with
temperature
Stability
The circuit design used in the AMS1117 series requires the use of
an output capacitor as part of the device frequency compensation
The addition of 22 µF solid tantalum on the output will ensure
stability for all operating conditions
When the adjustment terminal is bypassed with a capacitor to
improve the ripple rejection the requirement for an output
capacitor increases The value of 22 µF tantalum covers all cases of
bypassing the adjustment terminal Without bypassing the
adjustment terminal smaller capacitors can be used with equally
good results
To further improve stability and transient response of these
devices larger values of output capacitor can be used
Protection Diodes
Unlike older regulators the AMS1117 family does not need any
protection diodes between the adjustment pin and the output and
from the output to the input to prevent overstressing the die
Internal resistors are limiting the internal current paths on the
AMS1117 adjustment pin therefore even with capacitors on the
adjustment pin no protection diode is needed to ensure device
safety under shortcircuit conditions
Diodes between the input and output are not usually needed
Microsecond surge currents of 50A to 100A can be handled by the
internal diode between the input and output pins of the device In
normal operations it is difficult to get those values of surge
currents even with the use of large output capacitances If high
value output capacitors are used such as 1000 µF to 5000 µF and
the input pin is instantaneously shorted to ground damage can
occur A diode from output to input is recommended when a
crowbar circuit at the input of the AMS1117 is used (Figure 1)
AMS1117
IN OUT
ADJ + COUT
22µ F
VOUT
R1
R2
CADJ
10 µF
D1
VIN
Figure 1
Output Voltage
The AMS1117 series develops a 125V reference voltage between
the output and the adjust terminal Placing a resistor between these
two terminals causes a constant current to flow through R1 and
down through R2 to set the overall output voltage This current is
normally the specified minimum load current of 10mA Because
IADJ is very small and constant it represents a small error and it
can usually be ignored
AMS1117
IN OUT
ADJ R1
R2
VOUT
VREF
VIN
IADJ
50 µA
VOUT V REF (1+ R2R1)+I ADJ R2
Figure 2 Basic Adjustable Regulator
Load Regulation
True remote load sensing it is not possible to provide because the
AMS1117 is a three terminal device The resistance of the wire
connecting the regulator to the load will limit the load regulation
The data sheet specification for load regulation is measured at the
bottom of the package Negative side sensing is a true Kelvin
connection with the bottom of the output divider returned to the
negative side of the load
The best load regulation is obtained when the top of the resistor
divider R1 is connected directly to the case not to the load If R1
were connected to the load the effective resistance between the
regulator and the load would be
RP x ( R2+R1 ) R P Parasitic Line Resistance
R1
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AMS1117
APPLICATION HINTS
Connected as shown R P is not multiplied by the divider ratio
AMS1117
IN OUT
ADJ
RLR1*
R2*
VIN
RP
PARASITIC
LINE RESISTANCE
*CONNECT R1 TO CASE
CONNECT R2 TO LOAD
Figure 3 Connections for Best Load Regulation
In the case of fixed voltage devices the top of R1 is connected
Kelvin internally and the ground pin can be used for negative side
sensing
Thermal Considerations
The AMS1117 series have internal power and thermal limiting
circuitry designed to protect the device under overload conditions
However maximum junction temperature ratings of 125°C should
not be exceeded under continuous normal load conditions
Careful consideration must be given to all sources of thermal
resistance from junction to ambient For the surface mount
package SOT223 additional heat sources mounted near the device
must be considered The heat dissipation capability of the PC
board and its copper traces is used as a heat sink for the device
The thermal resistance from the junction to the tab for the
AMS1117 is 15 °CW Thermal resistance from tab to ambient can
be as low as 30 °CW
The total thermal resistance from junction to ambient can be as
low as 45 °CW This requires a reasonable sized PC board with at
least on layer of copper to spread the heat across the board and
couple it into the surrounding air
Experiments have shown that the heat spreading copper layer does
not need to be electrically connected to the tab of the device The
PC material can be very effective at transmitting heat between the
pad area attached to the pad of the device and a ground plane
layer either inside or on the opposite side of the board Although
the actual thermal resistance of the PC material is high the
LengthArea ratio of the thermal resistance between layers is
small The data in Table 1 was taken using 116 FR4 board with
1 oz copper foil and it can be used as a rough guideline for
estimating thermal resistance
For each application the thermal resistance will be affected by
thermal interactions with other components on the board To
determine the actual value some experimentation will be
necessary
The power dissipation of the AMS1117 is equal to
PD ( V IN VOUT )( I OUT )
Maximum junction temperature will be equal to
TJ T A(MAX) + P D(Thermal Resistance (junctiontoambient))
Maximum junction temperature must not exceed 125 °C
Ripple Rejection
The ripple rejection values are measured with the adjustment pin
bypassed The impedance of the adjust pin capacitor at the ripple
frequency should be less than the value of R1 (normally 100 Ω to
200 Ω) for a proper bypassing and ripple rejection approaching the
values shown The size of the required adjust pin capacitor is a
function of the input ripple frequency If R1100 Ω at 120Hz the
adjust pin capacitor should be >13 µF At 10kHz only 016 µF is
needed
The ripple rejection will be a function of output voltage in circuits
without an adjust pin bypass capacitor The output ripple will
increase directly as a ratio of the output voltage to the reference
voltage (V OUT V REF )
Table 1
COPPER AREA THERMAL RESISTANCE
TOP SIDE* BACK SIDE BOARD AREA (JUNCTIONTOAMBIENT)
2500 Sq mm 2500 Sq mm 2500 Sq mm 55°CW
1000 Sq mm 2500 Sq mm 2500 Sq mm 55°CW
225 Sq mm 2500 Sq mm 2500 Sq mm 65 °CW
100 Sq mm 2500 Sq mm 2500 Sq mm 80 °CW
1000 Sq mm 1000 Sq mm 1000 Sq mm 60 °CW
1000 Sq mm 0 1000 Sq mm 65°CW
* Tab of device attached to topside copper
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AMS1117
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Operating Current
(Adjustable Device) ShortCircuit Current
Load Regulation Ripple Rejection vs Current
Adjust Pin CurrentTemperature Stability
0 5 10 15 20
0
3
6
9
12
INPUTOUTPUT DIFFERENTIAL (V)
0 5 10 15
MINIMUM OPERATING CURRENT (mA)
INPUTOUTPUT DIFFERENTIAL
0
025
050
075
100
125
SHORT CIRCUIT CURRENT (A)
50 25 0 25 50 75 100 125
020
015
010
005
0
005
010
TEMPERATURE (°C)
OUTPUT VOLTAGE DEVIATION ()
0 025 05 075 10
0
10
20
30
40
50
60
70
80
90
100
OUTPUT CURRENT (A)
RIPPLE REJECTION (dB)
50 25 0 25 50 75 100 125 150
20
10
0
10
20
TEMPERATURE (°C)
OUTPUT VOLTAGE CHANGE ()
TEMPERATURE (°C)
50 25 0 25 50 75 100 125 150
0
10
20
30
40
50
60
70
80
90
100
ADJUST PIN CURRENT (
µ
A)
TJ 125°C
TJ 25°C
f RIPPLE 120Hz
f RIPPLE 20Hz
VRIPPLE ≤3Vpp
VRIPPLE ≤05Vpp
∆ I LOAD 1A
VOUT 5V
CADJ 25 µF
COUT 25 µF
TJ 125°C
TJ 25°C
Advanced Monolithic Systems Inc wwwadvancedmonolithiccom Phone (925) 4430722 Fax (925) 4430723
AMS1117
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted
TO252 PLASTIC PACKAGE (D)
0030
(0762)
TYP
00870094
(221239) 00180023
(046058)
0020±0002
(0510±00508)
00180023
(046058) D (D3) AMS DRW# 011601
00350050
(089127)
00350045
(089114)
02350245
(59696223)
01560204
(396518)
02550265
(648673)
02060214
(523544)
0025
(0635)
TYP
70°
03800410
(9651041)
00450060
(114152)
3 LEAD SOT223 PLASTIC PACKAGE
01300146
(330371)
02480264
(630671)
01160124
(295315)
02640287
(671729)
0090
(229)
NOM
0071
(180)
MAX
00330041
(084104)
00250033
(064084)
0181
(460)
NOM
0012
(031)
MIN
00250033
(064084)
10°
MAX
10°16°
10°16°
00100014
(025036)
(SOT223 ) AMS DRW# 042292Advanced Monolithic Systems Inc wwwadvancedmonolithiccom Phone (925) 4430722 Fax (925) 4430723
AMS1117
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted (Continued)
8 LEAD SOIC PLASTIC PACKAGE (S)
0°8° TYP
00100020
(02540508)
S (SO8 ) AMS DRW# 042293
x 45°
00160050
(04061270)
00080010
(02030254)
00040010
(01010254)
00140019
(03550483)
00530069
(13461752)
0050
(1270)
TYP
01500157**
(38103988)
02280244
(57916197)
01890197*
(48015004)
*DIMENSION DOES NOT INCLUDE MOLD FLASH MOLD FLASH
SHALL NOT EXCEED 0006 (0152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH INTERLEAD
FLASH SHALL NOT EXCEED 0010 (0254mm) PER SIDE
1 2 3 4
8 7 6 5
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