Diodes PAM3131 User Manual

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3A ADJUSTABLE LOW VOLTAGE LOW DROPOUT CMOS REGULATOR

Description

The PAM3131 is a 3A CMOS adjustable LDO regulator that features a low quiescent current, ultra low input, output, and dropout voltages, as well as over temperature protection. It is available in TO-263 and PSOP-8 (Exposed Pad) packages. The output voltage is adjustable from 0.9V to 3.3V. The PAM3131 is stable with a ceramic output capacitor of 1.0μF or higher.

This family of regulators can provide either a stand alone power supply solution or act as a post regulator for switch mode power supplies. They are particularly well suited for applications requiring low input and output voltages.

Features

• Low-Dropout Regulator Supports Input Voltages Down to 1.4V

• Low Dropout Voltage: 300mV@ 3A

• Output Voltage Adjustable from 0.9V-3.3V

• Stable with a Ceramic Output Capacitor of 1.0μF or Higher

• Low Quiescent Current

• Current Limit

• Over Temperature Shutdown

• Short Circuit Current Protection

• Low Temperature Coefficient

• Standard TO-263 and PSOP-8 (Exposed Pad) Packages

• Pb-Free Package

Pin Assignments

Applications

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PAM3131

Typical Applications Circuit

• DSP, FPGA, and Microprocessor Power Supplies

• 1.2V Core Voltage for DSPs

• SATA Power Supply

• LCD TV/ Monitors

• Wireless Devices

• Communication Devices

• Portable Electronics

• Post Regulator for SMPS

PAM3131

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Pin Description

Pin Name

VIN

EN

ADJ

VOUT

GND 3 1, 4, 8 Ground

PWRGD — 5 Power Good

Pin Number

TO263-5L PSOP-8(EPD)

1 2 Input 2 3 Enable Pin 4 6 Adjustable Pin 5 7 Output

Function

Functional Block Diagram

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PAM3131

Absolute Maximum Ratings (@T

These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability. All voltages are with respect to ground.

Parameter Rating Unit

Input Voltage 4.0 V Output Pin Voltage Operation Temperature Range -40 to +85 °C Operation Junction Range -40 to +125 °C Maximum Output Current Storage Temperature -65 to +150 °C Maximum Junction Temperature 150 °C Soldering Temperature 300, (5sec) °C

PAM3131

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= +25°C, unless otherwise specified.)

A

-0.3 to V

P

/(VIN–VO)

D

+0.3

IN

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V

—

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Recommended Operating Conditions (@T

Parameter Rating Unit

Supply Voltage Range 1.4 to 3.6 V Operation Temperature Range -40 to +85 Junction Temperataure Range -40 to +125

= +25°C, unless otherwise specified.)

A

Thermal Information

Parameter Symbol Package Max Unit

Thermal Resistance (Junction to Case)

Thermal Resistance (Junction to Ambient)

Internal Power Dissipation (TA = 25°C) PD

θ

PAM3131

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JC

JA

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TO-263 7

PSOP-8 10

TO-263 35

PSOP-8 50

TO-263 2800

PSOP-8 2000

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°C

°C/W

mW

PAM3131

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PAM3131

Electrical Characteristics (@T

Parameter Symbol Test Conditions Min Typ Max Units

Input Voltage Range ADJ Reference Voltage

Dropout Voltage

Short Circuit Current Output Current

Quiescent Current Ground Pin Current

Line Regulation LNR

Load Regulation LDR Over Temperature Shutdown OTS 150 °C Over Temperature Hysteresis OTH 50 °C Temperature Coefficient

Power Supply Ripple Rejection PSRR

Output Noise Vn f = 10Hz to 100kHz 40

Notes: 1. The minimum input voltage ( ) of the PAM3131 is determined by output voltage and dropout voltage. The minimum input voltage is defined as:

2. Output current is limited by P

PAM3131

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D

= +25°C, VIN = VO +1V, CIN = 4.7µF, CO = 4.7µF, unless otherwise specified.)

A

V

IN

IO = 100mA

V

REF

= 500mA

I

O

V

DROP

IO = 3.0A

I

VO < 0.3V

SC

3.0 Note 2 A

IO = 0mA

VO > 0.8V

V

≤ 2.5V, IO = 10mA

O

= VO +0.5V to VO +1.5V

V

IN

I

GND

I

O

I

Q

VO > 2.5V, IO = 10mA

= 3.3V to 3.6V

V

IN

I

= 1mA to 3.0A, VIN = V

O

T

, maximum IO = PD/(V

40 ppm/°C

C

= 100mA, VO = 1.5V

I

O

IN(MAX)

-VO).

V

= 0.9V

O

VO = 1.0V

2.5V > VO ≥ 1.2V VO ≥ 2.5V

= 0.9V

V

O

VO = 1.0V

2.5V > VO ≥ 1.2V VO ≥ 2.5V

+0.5A

O

f = 100Hz 64 f = 1kHz 58

Note 1 3.6 V

0.882 0.900 0.918 V

330 500 220 400 50 200 40 150 500 400 350 300

1.0 A

90 150 µA

1.0 mA

0.2 1.0 %/V

0.5 2 %/A

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µV

mV

dB

RMS

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Typical Performance Characteristics (@T

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= +25°C, CIN =4.7µF, CO = 2.2µF, unless otherwise specified.)

A

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