ADMOS AMS1503CT-3.5, AMS1503CT-3.3, AMS1503CT-3.0, AMS1503CT-2.85, AMS1503CT-5.0 Datasheet

Advanced AMS1503
Monolithic 3A LOW DROPOUT VOLTAGE REGULATORS

Systems

FEATURES APPLICATIONS

•• Adjustable or Fixed Output •• High Current Regulators

1.5V, 2.5V, 2.85V, 3.0V, 3.3V, 3.5V and 5.0V

•• Output Current of 3A •• Adjustable Power Supply

•• Low Dropout, 500mV at 3A Output Current •• Notebook/Personal Computer Supplies

•• Fast Transient Response

•• Remote Sense

GENERAL DESCRIPTION

The AMS1503 series of adjustable and fixed low dropout voltage regulators are designed to provide 3A output current to
power the new generation of microprocessors. The dropout voltage of the device is 100mV at light loads and rising to 500mV
at maximum output current. A second low current input voltage 1V or greater then the output voltage is required to achieve
this dropout. The AMS1503 can also be used as a single supply device.
New features have been added to the AMS1503: a remote Sense pin is brought out virtually eliminating output voltage
variations due to load changes. The typical load regulation, measured at the Sense pin, for a load current step of 100mA to 3A
is less than 1mV.
The AMS1503 series has fast transient response. The Adjust pin is brought out on fixed devices. To further improve the
transient response the addition of a small capacitor on the Adjust pin is recommended.
The AMS1503 series are ideal for generating power supplies of 2V to 3V where both 5V and 3.3V supplies are available.
The AMS1503 devices are offered in 5 lead TO-220 and TO-263 (plastic DD) packages and in the 7 lead TO-220 package.

•• Post Regulators for Switching Supplies

ORDERING INFORMATION: PIN CONNECTIONS

PACKAGE TYPE OPERATING JUNCTION

5 LEAD TO-263 5 LEAD TO-220 7 LEAD TO-220

AMS1503CM AMS1503CT AMS1503CT-1.5
AMS1503CM-1.5 AMS1503CT-1.5 AMS1503CT-2.5
AMS1503CM-2.5 AMS1503CT-2.5 AMS1503CT-2.85
AMS1503CM-2.85 AMS1503CT-2.85 AMS1503CT-3.0
AMS1503CM-3.0 AMS1503CT-3.0 AMS1503CT-3.3
AMS1503CM-3.3 AMS1503CT-3.3 AMS1503CT-3.5
AMS1503CM-3.5 AMS1503CT-3.5 AMS1503CT-5.0
AMS1503CM-5.0 AMS1503CT-5.0

TEMPERATURE RANGE

0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C
0 to 125° C

5 LEAD TO-220

5
4
3
2
1

FRONT VIEW

7 LEAD TO-220

7
6
5
4
3
2
1

FRONT VIEW

5 LEAD TO-263

5
4
3
2
1

FRONT VIEW

V

POWER

V

CONTROL

OUTPUT

ADJUST/GND

SENSE

NC
ADJUST

Vcontrol
SENSE

Vpower
Vcontrol
OUTPUT
ADJUST/GND
SENSE

Vpower

OUTPUT
GND

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AMS1503

Junction Temperature Range

ABSOLUTE MAXIMUM RATINGS (Note 1)

V

Input Voltage 6V Soldering information

POWER

V
Operating
Control Section
Power Transistor
Storage temperature

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

Parameter Device Conditions Min Typ Max Units

CONTROL

Input Voltage 13V Lead Temperature (10 sec)

Thermal Resistance

0°C to 125°C

0°C to 150°C

- 65°C to +150°C

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

LOAD

TO-220 package
TO-263 package

* With package soldering to 0.5in2 copper area over backside ground
plane or internal power plane ϕ
depending on mounting technique.

can vary from 20°C/W to >40°C/W

JA

300°C

ϕ JA= 50°C/W

ϕ JA= 30°C/W*

Reference Voltage AMS1503 V

Output Voltage AMS1503-1.5 V

AMS1503-2.5 V

AMS1503-2.85 V

AMS1503-3.0 V

AMS1503-3.3 V

AMS1503-3.5 V

AMS1503-5.0 V

Line Regulation AMS1503/-1.5/-2.5/

-2.85/-3.0/-3.3/-3.5/-5.0

Load Regulation AMS1503/-1.5/-2.5/

-2.85/-3.0/-3.3/-3.5/-5.0

Minimum Load

AMS1503 V

Current
Control Pin Current

(Note 4)

Ground Pin Current
(Note 4)

AMS1503/-1.5/-2.5/

-2.85/-3.0/-3.3/-3.5/-5.0
AMS1503-1.5/-2.5/-2.85/

-3.0/-3.3/-3.5/-5.0

= 2.75V, V

CONTROL

V

= 2.7V to 12V, V

CONTROL

I

= 10mA to 3A

LOAD

= 4V, V

CONTROL

V

= 3V, V

CONTROL

= 5V, V

CONTROL

V

= 4V, V

CONTROL

= 5.35V, V

CONTROL

V

= 4.4V, V

CONTROL

= 5.5V, V

CONTROL

V

= 4.5V, V

CONTROL

= 5.8V, V

CONTROL

V

= 4.8V, V

CONTROL

= 6V, V

CONTROL

V

= 5V, V

CONTROL

= 7.5V, V

CONTROL

V

= 6.5V, V

CONTROL

I

= 10 mA , 1.5V≤ (V

LOAD

0.8V≤ (V

POWER

V

= V

CONTROL

I

= 10mA to 3A

LOAD

= 5V, V

CONTROL

V

= V

CONTROL

I

= 10mA to 3A

LOAD

V

= V

CONTROL

I

= 10mA to 3A

LOAD

POWER
POWER

POWER
POWER

POWER
POWER

- V
+ 2.5V, V

OUT

POWER

+ 2.5V, V

OUT

+ 2.5V, V

OUT

POWER

POWER

POWER

POWER
POWER

POWER
POWER

POWER
POWER

OUT

=2V, I

POWER

=2.V, I
=2.3V, I

=3.3V, I
=3.3V, I

=3.35V, I

=3.7V, I
=3.5V, I

=3.8V, I
=3.8V, I

=4.1V, I

=4V, I
=4.3V, I

=5.5V, I
=5.8V, I

CONTROL

) ≤ 5.5V

POWER

=3.3V, V

POWER

POWER

= 10mA

LOAD

=3.3V to 5.5V,

= 0mA

LOAD

= 0mA to 3A

LOAD

= 0mA

LOAD

= 0mA to 3A

LOAD

= 0mA

LOAD

= 0mA to 3A

LOAD

= 0mA

LOAD

= 0mA to 3A

LOAD

= 0mA

LOAD

= 0mA to 3A

LOAD

= 0mA

LOAD

= 0mA to 3A

LOAD

= 0mA

LOAD

= 0mA to 3A

LOAD

- V

) ≤ 12V

OUT

=V

+ 0.8V,

OUT

= 0V (Note 3)

ADJ

=V

+ 0.8V,

OUT

=V

+ 0.8V,

OUT

1.243

1.237

1.491

1.485

2.485

2.475

2.821

2.833

2.982

2.970

3.280

3.235

3.479

3.430

4.930

4.950

1.250

1.250

1.500

1.500

2.500

2.500

2.850

2.850

3.000

3.000

3.300

3.300

3.500

3.500

5.000

5.000
1 3

1 5

5 10

6 60 120

6 10

1.257

1.263

1.509

1.515

2.515

2.525

2.879

2.867

3.018

3.030

3.320

3.333

3.521

3.535

5.030

5.050

V
V

V
V

V
V

V
V

V
V

V
V

V
V

V
V

mV

mA

mA

mA

mA

Adjust Pin Current AMS1503 V
Current Limit AMS1503/-1.5/-2.5/

CONTROL

(VIN - V

= 2.75V, V

) = 5V

OUT

POWER

= 2.05V, I

LOAD

= 10mA

5 120

3.0 3.5 4.0

µA

A

-2.85/-3.0/-3.3/-3.5/-5.0

Ripple Rejection AMS1503/-1.5/-2.5/

-2.85/-3.0/-3.3/-3.5/-5.0

V

CONTROL

I

LOAD

= V

= 1.5A

POWER

= V

+ 2.5V, V

OUT

RIPPLE

= 1V

P-P

60 80 dB

Thermal Regulation AMS1503 TA = 25°C, 30ms pulse 0.002 0.020 %W
Thermal Resistance

Junction-to-Case

T Package: Control Circuitry/ Power Transistor
M Package: Control Circuitry/ Power Transistor

0.65/2.70

0.65/2.70

°C/W
°C/W

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AMS1503

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at I

Parameter Device Conditions Min Typ Max Units

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

OUT

Dropout Voltage

Control Dropout
(V

Power Dropout
(V

Parameters identified with boldface type apply over the full operating temperature range.

CONTROL

POWER

- V

- V

OUT

OUT

)

AMS1503/-1.5/-2.5/-

)

2.85/-3.0/-3.3/-3.5/-5.0

AMS1503/-1.5/-2.5/-

2.85/-3.0/-3.3/-3.5/-5.0

Note 2

V

POWER

V

POWER

V

CONTROL

V

CONTROL

V

CONTROL

=V
=V

=V
=V
=V

OUT

OUT

OUT

OUT

OUT

+ 0.8V, I
+ 0.8V, I

+ 2.5V, I
+ 2.5V, I
+ 2.5V, I

LOAD

LOAD

LOAD

LOAD

LOAD

= 10mA
= 3A

= 10mA
= 2A
= 3A

1.00

1.15

0.10

0.30

0.35

1.15

1.30

0.17

0.45

0.50

V
V

V
V
V

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: Unless otherwise specified V

OUT

= V

. For the adjustable device V

SENSE

ADJ

= 0V.

Note 3: The dropout voltage for the AMS1503 is caused by either minimum control voltage or minimum power voltage. The specifications represent the minimum

input/output voltage required to maintain 1% regulation.

Note 4: For the adjustable device the minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor divider

used to set the output voltage is selected to meet the minimum load current requirement.

Note 5: The control pin current is the drive current required for the output transistor. This current will track output current with a ratio of about 1:100. The

minimum value is equal to the quiescent current of the device.

PIN FUNCTIONS

Sense (Pin 1): This pin is the positive side of the

reference voltage for the device. With this pin it is
possible to Kelvin sense the output voltage at the load.

Adjust (Pin 2/5): This pin is the negative side of the
reference voltage for the device. Adding a small bypass
capacitor from the Adjust pin to ground improves the
transient response. For fixed voltage devices the Adjust
pin is also brought out to allow the user to add a bypass
capacitor.

GND (Pin 2, 7-Lead only): For fixed voltage devices this
is the bottom of the resistor divider that sets the output
voltage.

V

(Pin 5/6): This pin is the collector to the power

POWER

device of the AMS1503. The output load current is
supplied through this pin. The voltage at this pin must
be between 0.1V and 0.8V greater than the output
voltage for the device to regulate.

V

CONTROL

(Pin 4/3): This pin is the supply pin for the

control circuitry of the device. The current flow into
this pin will be about 1% of the output current. The
voltage at this pin must be 1.3V or greater than the
output voltage for the device to regulate.

Output (Pin 3/4): This is the power output of the
device.

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