LTC3408 datasheet(1/12 Pages) LINER

Part #	LTC3408

Description	1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor

PDF	12 Pages

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3408

3408f

■ WCDMA Cell Phone Power Amplifiers

■

Wireless Modems

WCDMA Transmitter Power Supply

, LTC and LT are registered trademarks of Linear Technology Corporation.

1.5MHz, 600mA

Synchronous Step-Down

Regulator with Bypass Transistor

■ Dynamically Adjustable Output from 0.3V to 3.5V

■ 600mA Output Current

■ Internal 0.08

Ω P-Channel MOSFET Bypass

Transistor

■ High Efficiency: Up to 96%

■ 1.5MHz Constant Frequency Operation

■ No Schottky Diode Required

■ Low Dropout Operation: 100% Duty Cycle

■ 2.5V to 5V Input Voltage Range

■ Shutdown Mode Draws < 1

µA Supply Current

■ Current Mode Operation for Excellent Line and

Load Transient Response

■ Overtemperature Protected

■ Available in 8-Lead 3mm

× 3mm DFN Package

The LTC

®3408 is a high efficiency monolithic synchro-

nous buck regulator optimized for WCDMA power ampli-

fier applications. The output voltage can be dynamically

programmed from 0.3V to 3.5V. At VOUT > 3.6V an internal

0.08

Ω bypass P-channel MOSFET connects VOUT directly

to VIN, eliminating power loss through the inductor.

The input voltage range is 2.5V to 5V making the LTC3408

ideally suited for single Li-Ion battery-powered applica-

tions. 100% duty cycle provides low dropout operation,

extending battery life in portable systems.

Switching frequency is internally set at 1.5MHz, allowing

the use of small surface mount inductors and capacitors.

The internal synchronous switch increases efficiency and

eliminates the need for an external Schottky diode.

The LTC3408 is available in a low profile (0.75mm) 8-lead

3mm

× 3mm DFN package.

Efficiency Power Lost vs Load Current

U.S. Patent Numbers: 5481178, 6580258, 6304066, 6127815, 6498466, 6611131

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

VIN

CIN

†

10

µF

CER

VIN

2.7V

TO 5V

*

**

†

LTC3408

RUN

REF

4.7

µH*

3403 TA01

MURATA LQH32CN4R7M11

TAIYO YUDEN JMK212BJ475MG

TAIYO YUDEN JMK212BJ106MN

SW

VOUT

GND

COUT**

4.7

µF

CER

VOUT

3

× VREF

600mA

WCDMA

RF PA

OUTPUT

PROGRAMMING

DAC

LOAD CURRENT (mA)

1

0.01

0.1

1

0

20

10

60

30

70

40

80

50

90

100

10

100

1000

3408 F04

VOUT = 1.2V

VOUT = 1.5V

VOUT = 1.8V

VOUT = 2.5V

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