LP3204A-15B5 POWER [Lowpower Semiconductor inc], LP3204A-15B5 Datasheet

LP3204A-15B5

Manufacturer Part Number

LP3204A-15B5

Description

1.5MHz, 800mA, High Efficiency Synchronous PWM Step-Down DC/DC Convert

Manufacturer

POWER [Lowpower Semiconductor inc]

Datasheet

1.LP3204A-15B5.pdf (11 pages)

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General Description

The LP3204 is a constant frequency, current mode,

PWM step-down converter. The device integrates a

main switch and a synchronous rectifier for high

efficiency. The 2.5V to 5.5V input voltage range

makes the LP3204 is ideally suited for portable

electronic devices that are powered from 1-cell

Li-ion battery or from other power sources within

the range such as cellular phones, PDAs and

handy-terminals.

Internal synchronous rectifier with low RDS(ON)

dramatically reduces conduction loss at PWM mode.

The

efficiency while eliminate the need for an external

Schottky diode.The switching ripple is easily

smoothed-out by small package filtering elements

due to a fixed operation frequency of 1.5MHz. This

along with small SOT-23-5 package provide small

PCB area application. Other features include soft

start, lower internal reference voltage with 2%

accuracy, over temperature protection, and over

current protection.

Ordering Information

LP3204-datasheet Feb.-2006

LP3204 □ - □ □ □ □

internal

synchronous

1.5MHz, 800mA, High Efficiency Synchronous

Output Voltage:

Output Type:

A:A-Type

B:B-Type

B5: SOT-23-5

15: 1.5V

18: 1.8V

25: 2.5V

28: 2.8V

AD:Adjust

switch

Package Type

increases

Features

Applications

Pin Configurations

Marking Information

Suitable for use in SnPb or Pb-free

RoHS compliant and compatible

soldering processes.

with the current require ments of

IPC/JEDEC J-STD-0202.

PWM Step-Down DC/DC Convert

High Efficiency: 96%

1.5MHz Fixed-Frequency PWM Operation

Adjustable Output From 0.6V to VIN

800mA Output Current, 1.1A Peak Current

No Schottky Diode Required

100% Duty Cycle Low Dropout Operation

Available in SOT23-5 Package

Short Circuit and Thermal Protection

Over Voltage Protection

Low than 1µA Shutdown Current

Portable Media Players/MP3 players

Cellular and Smart mobile phone

PDA

DSC

Wireless Card

A-Type

B-Type

LP3204

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LP3204A-15B5 Summary of contents

Page 1

High Efficiency Synchronous General Description The LP3204 is a constant frequency, current mode, PWM step-down converter. The device integrates a main switch and a synchronous rectifier for high efficiency. The 2.5V to 5.5V input voltage range makes the ...

Page 2

Typical Application Circuit LP3204-datasheet Feb.-2006 - 2 2 LP3204 ...

Page 3

Functional Pin Description Function Block Diagram Absolute Maximum Ratings LP3204-datasheet Feb.-2006 - 3 3 LP3204 ...

Page 4

Electrical Characteristics (VIN = 3.6V, VOUT = 2.5V, VREF = 0.6V 2.2µH, CIN= 4.7µF, COUT= 10µF, TA= 25°C, IMAX = 650mA unless otherwise specified) Parameter Symbol Input Voltage Range VIN Quiescent Current IQ Shutdown Current ISHDN Reference Voltage ...

Page 5

Typical Operating Characteristics LP3204-datasheet Feb.-2006 - 5 5 LP3204 ...

Page 6

LP3204-datasheet Feb.-2006 - 6 6 LP3204 ...

Page 7

LP3204-datasheet Feb.-2006 - 7 7 LP3204 ...

Page 8

Applications Information The basic LP3204 application circuit is shown in Typical Application Circuit. External component selection is determined by the maximum load current and begins with the selection of the inductor value and operating frequency followed by CIN and COUT. ...

Page 9

LP3204-datasheet Feb.-2006 - 9 9 LP3204 ...

Page 10

Checking Transient Response The regulator loop response can be checked by looking at the load transient response. Switching regulators take several cycles to respond to a step in load current. When a load step occurs, VOUT immediately shifts by an ...

Page 11

LP3204-datasheet Feb.-2006 - 11 11 LP3204 ...

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