Advanced Monolithic Systems AMS1117 Service Manual

http://www.BDTIC.com/AMS

Advanced AMS1117
Monolithic 1A LOW DROPOUT VOLTAGE REGULATOR

Systems

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 1A output current and to operate down

1V input-to-output differential. The dropout voltage of the device is guaranteed maximum 1.3V at maximum output current,

to
decreasing at lower load currents.
On-chip trimming adjusts the reference voltage to 1.5%. 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 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:

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-

OUT

VIN

PACKAGE TYPE OPERATING JUNCTION

TEMPERATURE RANGE

SOT-223 Top View

•••• Post Regulators for Switching Supplies

-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

8L SOIC Top View

GND/ADJ

V

OUT

V

OUT

V

IN

1

2

3

4

8

N/C

7

V

OUT

6

V

OUT

5

N/C

TO-252 FRONT VIEW

TAB IS

OUTPUT

1

2

3

3
2
1

Advanced Monolithic Systems, Inc.

http://www.BDTIC.com/AMS

AMS1117

ABSOLUTE MAXIMUM RATINGS (Note 1)

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

-40°C to 125°C

-40°C to 125°C

- 65°C to +150°C

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.

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

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

OUT

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

AMS1117-1.8

AMS1117-2.5

AMS1117-2.85

AMS1117-3.3

AMS1117-5.0

AMS1117

Advanced Monolithic Systems, Inc.

= 10 mA

OUT

1.5V≤ (VIN - V

3.0V≤ VIN ≤ 12V

3.3V≤ VIN ≤ 12V

4.0V≤ VIN ≤ 12V

4.35V≤ VIN ≤ 12V

4.75V ≤ VIN ≤ 12V

6.5V ≤ VIN ≤ 12V

1.5V≤ (VIN - V

3.0V≤ VIN ≤ 12V

3.3V≤ VIN ≤ 12V

4.0V≤ VIN ≤ 12V

4.35V≤ VIN ≤ 12V

4.75V≤ VIN ≤ 12V

6.5V≤ VIN ≤ 12V

(VIN - V

VIN = 3V, 0 ≤ I

VIN = 3.3V, 0 ≤ I

VIN = 5V, 0 ≤ I

OUT

OUT

) =1.5V, 10mA ≤ I

OUT

OUT

OUT

OUT

) ≤ 12V

) ≤ 12V

≤ 1A

≤ 1A

≤ 1A

OUT

≤ 1A

1.232

1.2125

1.478

1.455

1.773

1.746

2.463

2.425

2.808

2.7645

3.251

3.201

4.925

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

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

http://www.BDTIC.com/AMS

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

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

OUT

AMS1117

Parameter

Device Conditions Min Typ Max Units

Load Regulation

(Notes 2, 3)

AMS1117-3.3

AMS1117-5.0

Dropout Voltage

(V

- V

OUT

)

IN

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

VIN = 4.35V, 0 ≤ I

VIN = 4.75V, 0 ≤ I

VIN = 6.5V, 0 ≤ I

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

∆V

OUT

(VIN - V

AMS1117 (VIN - V

(VIN - V

2.85/-3.3/-5.0

f =120Hz , C
(VIN-V

AMS1117-1.5/-1.8/-2.5/-

2.85

f =120Hz , C
VIN = 4.35V

f =120Hz , C
VIN = 4.75V

f =120Hz , C
VIN = 6.5V

≤ 1A

OUT

≤ 1A

OUT

≤ 1A

OUT

, ∆V

= 1%, I

REF

) = 1.5V

OUT

) = 1.5V (Note 5)

OUT

) = 1.5V

OUT

= 22µF Tantalum, I

OUT

) = 3V, C

OUT

= 22µF Tantalum, I

OUT

= 22µF Tantalum, I

OUT

= 22µF Tantalum, I

OUT

ADJ

OUT

=10µF

= 1A (Note 4)

OUT

OUT

OUT

OUT

= 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

OUT

)

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: 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

guaranteed to regulate if the output current is greater than 10mA.

maintain regulation. When 1.5V ≤ (VIN - V

) ≤ 12V the device is

OUT

Advanced Monolithic Systems, Inc.