PAM2319

Dual High-Efficiency PWM Step-Down DC-DC Coverter

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Power Analog Microelectronics Inc

www.poweranalog.com

12/2011 Rev1.1

Features

Applications

General Description

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Supply Voltage:2.7V to 5.5V

Output Voltage:

Vo1 ADJ/1000mA

Vo2 ADJ/2000mA

Low Quiescent Current:

Channel 1: 40uA; Channel 2: 55uA

High Efficiency:

Switching Frequency: 3MHz(Channel 1)

2.5MHz(Channel 2)

Internal Synchronous Rectifier

Soft Start

Under-Voltage Lockout

Short Circuit Protection

Thermal Shutdown

Small WDFN3X3-12L Pb-Free/Halogen

Free Package

RoHS/REACH Compliant

Portable Electronics

Personal Information Appliances

Wireless and DSL Modems

The PAM2319 is a dual step-down current-mode,

DC-DC converter. At heavy load, the constant-

f r e q u e n c y P W M c o n t r o l p e r f o r m s e x c e l l e n t

stability and transient response. To ensure the

longest battery life in portable applications, the

PA M 2 3 1 9 p r o v i d e s a p o w e r - s a v i n g P u l s e -

Skipping Modulation (PSM) mode to reduce

quiescent current under light load operation.

The PAM2319 supports a range of input voltages

from 2.7V to 5.5V, allowing the use of a single

Li+/Li-polymer cell, multiple Alkaline/NiMH cell,

USB, and other standard power sources. The dual

output voltages are adjustable from 1.0V to 3.3V .

Both channels employ internal power switch and

synchronous rectifier to minimize external part

c o u n t a n d r e a l i z e h i g h e f f i c i e n c y. D u r i n g

shutdown, the input is disconnected from the

output and the shutdown current is less than

0.1 A. Other key features include under-voltage

lo ckou t,so ft-sta rt,sho rt circuit p ro tection and

thermal shutdown.

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Typical Application

Figure 1. Adjustable Voltage Regulator

C in 1

1 uF

0

C i n2

1 u F

0

0

0

0

0

VIN1( 4)

(8)AGND 1

(6 )SW1

EN 1(9 )

(5 )PGN D1

(7 )FB 1

PAM23 19

EN 2 (1 0)

VIN2 (2 )

(1 )FB2

(3)AGND 2

( 12) SW2

(1 1)P GN D2

L1

1 .0u H

1

2

R 1 1

3 0 0 k

R 1 2

1 5 0 k

C fw1

10 0 pF

C in

1 0 uF

Co 1

10u F

0

0

Vo1

1 .8 V/1 00 0 m A

L 2

1 .0 uH

1

2

R 2 1

1 5 0 k

R 2 2

1 5 0 k

C fw2

10 0 pF

Co 2

10 uF

0

0

Vo 2

1 .2 V/2 00 0 m A

0

VIN

2.7 V--5 .5V