AMS AMS1117 Schematics

Post Regulators for Switching Supplies

Advanced
Monolithic

Systems

AMS1117

1A LOW DROPOUT VOLTAGE REGULATOR

RoHs Compliant

FEATURES

APPLICATIONS

•••• Three Terminal Adjustable or Fixed Voltages* •••• High Efficiency Linear Regulators

1.5V, 1.8V, 2.5V, 2.85V, 3.3V and 5.0V

••••

•••• Output Current of 1A •••• 5V to 3.3V Linear Regulator

•••• Operates Down to 1V Dropout •••• Battery Chargers

•••• Line Regulation: 0.2% Max. •••• Active SCSI Terminators

•••• Load Regulation: 0.4% Max. •••• Power Management for Notebook

•••• SOT-223, TO-252 and SO-8 package available •••• Battery Powered Instrumentation

GENERAL DESCRIPTION

The AMS1117 series of adjustable and fixed voltage regulators are designed to provide up to1A output current and to operate
down to 1V input-to-output differential. The dropout voltage of the device is guaranteed maximum 1.3V, decreasing at lower
load currents.
On-chip trimming adjusts the reference voltage to 1.5%. Current limit is set to minimize the stress under overload conditions
on both the regulator and power source circuitry.
The AMS1117 devices are pin compatible with other three-terminal SCSI regulators and are offered in the low profile surface
mount SOT-223 package, in the 8L SOIC package and in the TO-252 (DPAK) plastic package.

ORDERING INFORMATION:

PACKAGE TYPE OPERATING JUNCTION

TO-252 SOT-223 8L SOIC

AMS1117CD AMS1117 AMS1117CS
AMS1117CD-1.5 AMS1117-1.5 AMS1117CS-1.5
AMS1117CD-1.8 AMS1117-1.8 AMS1117CS-1.8
AMS1117CD-2.5 AMS1117-2.5 AMS1117CS-2.5
AMS1117CD-2.85 AMS1117-2.85 AMS1117CS-2.85
AMS1117CD-3.3 AMS1117-3.3 AMS1117CS-3.3
AMS1117CD-5.0 AMS1117-5.0 AMS1117CS-5.0

*For additional available fixed voltages contact factory.

PIN CONNECTIONS

3 PIN FIXED/ADJUSTABLE
VERSION

1- Ground/Adjust
2- V
3- VIN

OUT

TEMPERATURE RANGE

-40 to 125° C

-40 to 125° C

-40 to 125° C

-40 to 125° C

-40 to 125° C

-40 to 125° C

-40 to 125° C

SOT-223 Top View

1

2

3

8L SOIC Top View

GND/ADJ

V

OUT

V

OUT

V

IN

TO-252 FRONT VIEW

TAB IS

OUTPUT

1

2

3

4

8

N/C

7

V

OUT

6

V

OUT

5

N/C

3
2
1

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AMS1117

Junction Temperature Range

OUT

ABSOLUTE MAXIMUM RATINGS

Power Dissipation Internally limited Soldering information
Input Voltage 15V Lead Temperature (25 sec)
Operating
Control Section
Power Transistor
Storage temperature

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

= 0 mA, and TJ = +25°C unless otherwise specified.

OUT

(Note 1)

-40°C to 125°C

-40°C to 125°C

- 65°C to +150°C

Thermal Resistance

SO-8 package
TO-252 package
SOT-223 package

* With package soldering to copper area over backside
ground plane or internal power plane ϕ
46°C/W to >90°C/W depending on mounting technique and
the size of the copper area.

265°C

ϕ JA= 160°C/W

ϕ JA= 80°C/W

ϕ JA= 90°C/W*

can vary from

JA

Parameter

Device Conditions Min Typ Max Units

Reference Voltage
(Note 2)

Output Voltage
(Note 2)

Line Regulation AMS1117

AMS1117-1.5

AMS1117-1.8

AMS1117-2.5

AMS1117-2.85

AMS1117-3.3

AMS1117-5.0

Load Regulation

(Notes 2, 3)

AMS1117-1.5

AMS1117-1.8

AMS1117-2.5

AMS1117 I

AMS1117-1.5 VIN = 3V 1.478

AMS1117-1.8 VIN = 3.3V 1.773

AMS1117-2.5 VIN = 4V 2.463

AMS1117-2.85 VIN = 4.35V 2.808

AMS1117-3.3 VIN = 4.8V 3.251

AMS1117-5.0 VIN = 6.5V 4.925

AMS1117

= 10 mA

OUT

1.5V≤ (VIN - V

1.5V≤ (VIN - V

1.5V≤ (VIN - V

1.5V≤ (VIN - V

1.5V≤ (VIN - V

1.5V≤ (VIN - V

1.5V≤ (VIN - V

1.5V≤ (VIN - V

(VIN - V

VIN = 3V, 0 ≤ I

VIN = 3.3V, 0 ≤ I

VIN = 5V, 0 ≤ I

) =1.5V, 10mA ≤ I

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

OUT

) ≤ 12V

) ≤ 12V

) ≤ 12V

) ≤ 12V

) ≤ 12V

) ≤ 12V

) ≤ 12V

) ≤ 12V

≤ 0.8A

≤ 0.8A

≤ 0.8A

OUT

≤ 0.8A

1.232

1.2125

1.455

1.746

2.425

2.7645

3.201

4.850

0.015

0.3

0.3

0.3

0.3

0.5

0.5

3

3

3

1.250

1.250

1.500

1.500

1.800

1.800

2.500

2.500

2.850

2.850

3.300

3.300

5.000

5.000

0.035

0.6

0.6

0.6

0.6

1.0

1.0

0.1

0.2

6

6

6

1.268

1.2875

1.522

1.545

1.827

1.854

2.537

2.575

2.892

2.9355

3.349

3.399

5.075

5.150

0.2

0.2

5

6

5

6

6

6

6

6

10

10

10
10

0.3

0.4

10

20

10

20

12

20

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V
V

V
V

V
V

V
V

V
V

V
V

V
V

%
%

mV
mV

mV
mV

mV
mV

mV
mV

mV
mV

mV
mV

%
%

mV
mV

mV
mV

mV
mV

IN

OUT

OUT

ADJ

OUT

AMS1117

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

Parameter

Device Conditions Min Typ Max Units

Load Regulation

(Notes 2, 3)

AMS1117-3.3

AMS1117-5.0

Dropout Voltage

(V

-

V

)

Current Limit

Minimum Load
Current

Quiescent Current AMS1117-1.5/-1.8/-2.5/-

Ripple Rejection AMS1117

AMS1117-3.3

AMS1117-5.0

Thermal Regulation AMS1117 TA = 25°C, 30ms pulse 0.008 0.04 %W

AMS1117-2.85

AMS1117-1.5/-1.8/-2.5/-

2.85/-3.3/-5.0

AMS1117-1.5/-1.8/-2.5/-

2.85/-3.3/-5.0

AMS1117 (VIN - V

2.85/-3.3/-5.0

AMS1117-1.5/-1.8/-2.5/-

2.85

= 0 mA, and TJ = +25°C unless otherwise specified.

OUT

VIN = 4.35V, 0 ≤ I

VIN = 4.75V, 0 ≤ I

VIN = 6.5V, 0 ≤ I

∆V

, ∆V

OUT

REF

OUT

OUT

≤ 0.8A

OUT

= 1%, I

≤ 0.8A

≤ 0.8A

= 0.8A (Note 4)

OUT

(VIN - V

OUT

) = 1.5V

) = 1.5V (Note 5)

OUT

(VIN - V

f =120Hz , C
(VIN-V

f =120Hz , C

) = 1.5V

OUT

= 22µF Tantalum, I

OUT

) = 3V, C

= 22µF Tantalum, I

OUT

=10µF

OUT

OUT

VIN = 4.35V

f =120Hz , C

= 22µF Tantalum, I

OUT

OUT

VIN = 4.75V

f =120Hz , C

= 22µF Tantalum, I

OUT

OUT

VIN = 6.5V

= 1A,

= 1A,

= 1A

= 1A

3

3

5

10

1.1 1.3

6

7

12
20

15

25

20

35

900 1,100 1,500

5 10

60 75

60

60 72

60 68

5

72

dB

11

mV
mV

mV
mV

mV
mV

V

mA

mA

mA

dB

dB

dB

Adjust Pin Current AMS1117

Adjust Pin Current

AMS1117

Change

Temperature Stability

I

=10mA , 1.5V≤ (VIN - V

OUT

I

=10mA, 1.5V≤ (VIN - V

OUT

OUT

OUT

) ≤ 12V

) ≤ 12V

55

0.2

0.5

120

5

µA
µA

µA

%

Long Term Stability TA =125°C, 1000Hrs 0.3 1 %

RMS Output Noise

(% of V

)

Thermal Resistance
Junction-to-Case

TA = 25°C , 10Hz ≤ f ≤ 10kHz

All packages

0.003

15 °C/W

%

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 1.2 W for SOT-223, 2.2W for TO-252 and 780mW for 8-Lead
SOIC. Power dissipation is determined by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available
over the full input/output 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 ~1/8” from the package.

Note 4:
Note 5:

Dropout voltage is specified up to 0.8A load. For currents over 0.8A dropout will be higher

Minimum load current is defined as the minimum output current required to maintain regulation. When 1.5V ≤ (VIN - V
guaranteed to regulate if the output current is greater than 10mA.

) ≤ 12V the device is

OUT

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