Advanced Monolithic Systems AMS2911 Service Manual

http://www.BDTIC.com/AMS

Advanced AMS2911

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 Li

• Operates Down to 1V Dropout • Battery Chargers

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

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

• Available in TO-220, TO-263, TO-252 and SOT-223

packages

GENERAL DESCRIPTION

The AMS2911 series of adjustable and fixed voltage regulators are designed to provide 1A output current and to operate
down to 1V input-to-output differential. The dropout voltage of the device is guaranteed maximum 1.5V at maximum output
current, decreasing at lower load currents.
On-chip trimming adjusts the reference voltage to 1%. Current limit is also trimmed, minimizing the stress under overload
conditions on both the regulator and power source circuitry.
The AMS2911 devices are pin compatible with other three-terminal regulators and are offered in the 3 lead TO-220 package,
in the 3Lead TO-263 (Plastic DD), in the TO-252 (DPAK) and in the low profile surface mount SOT-223 package.

ORDERING INFORMATION:

3 LEAD TO-220 3 LEAD TO-263 TO-252 SOT-223

PACKAGE TYPE OPERATING JUNCTION

AMS2911CT AMS2911CM AMS2911CD AMS2911
AMS2911CT-1.5 AMS2911CM-1.5 AMS2911CD-1.5 AMS2911-1.5
AMS2911CT-1.8 AMS2911CM-1.8 AMS2911CD-1.8 AMS2911-1.8
AMS2911CT-2.5 AMS2911CM-2.5 AMS2911CD-2.5 AMS2911-2.5
AMS2911CT-2.85 AMS2911CM-2.85 AMS2911CD-2.85 AMS2911-2.85
AMS2911CT-3.3 AMS2911CM-3.3 AMS2911CD-3.3 AMS2911-3.3
AMS2911CT-5.0 AMS2911CM-5.0 AMS2911CD-5.0 AMS2911-5.0
*For additional available fixed voltages contact factory.

PIN CONNECTIONS

FIXED VERSION

1- V

IN

2- Ground

OUT

3- V

ADJUSTABLE VERSION

1- V

IN

2- Adjust

OUT

3- V

• Post Regulators for Switching Supplies
near Regulator

• Battery Powered Instrumentation

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

TO-252 FRONT VIEW

3
2
1

TO-220 FRONT VIEW

3
2

1

TO-263 FRONT VIEW

3
2
1

Advanced Monolithic Systems, Inc.

AMS2911

http://www.BDTIC.com/AMS

ABSOLUTE MAXIMUM RATINGS (Note 1)

Power Dissipation Internally limited Thermal Resistance
Input Voltage 15V TO-220 package
Operating Junction Temperature TO-263 package
Control Section
Power Transistor
Storage temperature

-40°C to 125°C

-40°C to 150°C

- 65°C to +150°C
Soldering information
Lead Temperature (25 sec)

265°C

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

= 50°C/W

ϕ

JA

ϕ

JA

30°C/W

JA=

80°C/W

ϕ

JA=

= 90°C/W*

ϕ

JA

can vary from

Parameter

Device Conditions Min Typ Max Units

Reference Voltage
(Note 2)

Output Voltage
(Note 2)

Line Regulation AMS2911

AMS2911-1.5

AMS2911-1.8

AMS2911-2.5

AMS2911-2.85

AMS2911-3.3

AMS2911-5.0

Load Regulation
(Notes 2, 3)

AMS2911-1.5

AMS2911-1.8

AMS2911-2.5

AMS2911 I

AMS2911-1.5

AMS2911-1.8

AMS2911-2.5

AMS2911-2.85

AMS2911-3.3

AMS2911-5.0

AMS2911

= 10 mA

OUT

10mA ≤ I

≤ 1A , 4.35V≤ VIN ≤ 12V

0 ≤ I

OUT

≤ 1A , 4.35V≤ VIN ≤ 12V

0 ≤ I

OUT

≤ 1A , 4.35V≤ VIN ≤ 12V

0 ≤ I

OUT

≤ 1A , 4.35V≤ VIN ≤ 12V

0 ≤ I

OUT

≤ 1A , 4.75V ≤ VIN ≤ 12V

0 ≤ I

OUT

≤ 1A , 6.5V ≤ VIN ≤ 12V

0 ≤ I

OUT

= 10 mA , 1.5V≤ (VIN - V

I

LOAD

4.35V≤ V

4.35V≤ V

4.35V≤ V

4.35V≤ V

4.75V≤ V

6.5V≤ V

IN

- V

(V

IN

OUT

= 5V, 0 ≤ I

V

IN

= 5V, 0 ≤ I

V

IN

= 5V, 0 ≤ I

V

IN

≤ 1A, 1.5V≤ (VIN - V

OUT

≤ 12V

IN

≤ 12V

IN

≤ 12V

IN

≤ 12V

IN

≤ 12V

IN

≤ 12V

) =3V, 10mA ≤ I

≤ 1A

OUT

≤ 1A

OUT

≤ 1A

OUT

OUT

OUT

) ≤ 12V

OUT

≤ 1A

) ≤ 12V

1.238

1.225

1.485

1.476

1.782

1.773

2.475

2.460

2.82

2.79

3.267

3.235

4.950

4.900

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

0.015

0.035

0.3

0.3

0.3

0.3

0.5

0.5

3 6 10

3 6 10

3 6 12

0.6

0.6

0.6

0.6

1.0

1.0

0.1

0.2

1.262

1.270

1.515

1.524

1.818

1.827

2.525

2.540

2.88

2.91

3.333

3.365

5.050

5.100

.02
.02

5
6

5
6

6
6

6
6

10
10

10
10

0.3

0.4

20

20

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

Advanced Monolithic Systems, Inc.

http://www.BDTIC.com/AMS

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

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

OUT

AMS2911

Parameter

Device Conditions Min Typ Max Units

Load Regulation
(Notes 2, 3)

AMS2911-2.85

AMS2911-3.3

= 5V, 0 ≤ I

V

IN

V

= 5V, 0 ≤ I

IN

OUT

OUT

≤ 1A

≤ 1A

3 6 12

20

3 7 15

25

Dropout Voltage
(V

- V

OUT

)

IN

Current Limit

Minimum Load

AMS2911-5.0

AMS2911-1.5/-1.8/-2.5/-

2.85/ -3.3/-5.0
AMS2911-1.5/-1.8/-2.5/-

2.85/ -3.3/-5.0

V

= 8V, 0 ≤ I

IN

∆V

OUT

(VIN - V

AMS2911 (VIN - V

≤ 1A

OUT

, ∆V

= 1%, I

REF

) = 5V

OUT

) = 12V (Note 5)

OUT

= 1A (Note 4)

OUT

5

10

1.3 1.5

20

35

.9 1.1 1.5

5 10

Current

≤ 12V

V

Quiescent Current AMS2911-1.5/-1.8/-2.5/-

IN

2.85/ -3.3/-5.0

Ripple Rejection AMS2911

AMS2911-1.5/-1.8/-2.5/-

2.85

AMS2911-3.3

AMS2911-5

f =120Hz , C
(V

IN-VOUT

f =120Hz , C

= 6V

V

IN

f =120Hz , C

= 6.3V

V

IN

f =120Hz , C

= 8V

V

IN

= 25µF Tantalum, I

OUT

) = 3V, C

ADJ

= 25µF Tantalum, I

OUT

= 25µF Tantalum, I

OUT

= 25µF Tantalum, I

OUT

=25µF

OUT

OUT

OUT

OUT

= 1A,

= 1A,

= 1A

= 1A

5

60 75

60

72

60 72

60 68

dB

10

Thermal Regulation AMS2911 TA = 25°C, 30ms pulse 0.008 0.04 %W

mV
mV

mV
mV

mV
mV

V

A

mA

mA

dB

dB

dB

Adjust Pin Current AMS2911

Adjust Pin Current

AMS2911

Change
Temperature Stability

10mA ≤ I

10mA ≤ I

≤ 1A , 1.5V≤ (VIN - V

OUT

≤ 1A , 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

OUT

)

(% of V
Thermal Resistance

Junction-to-Case

= 25°C , 10Hz ≤ f ≤ 10kHz

T

A

M Package: Control Circuitry/ Power Transistor

T Package: Control Circuitry/ Power Transistor

0.003 %

1.5/4.0

1.5/4.0

°C/W
°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 1.2W. 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 maintain regulation. When 1.5 ≤ (V

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

- V

) ≤12V the device is

IN

OUT

Advanced Monolithic Systems, Inc.