LTC3406BES5-1.5 Linear Technology Corporation, LTC3406BES5-1.5 Datasheet

LTC3406BES5-1.5

Manufacturer Part Number

LTC3406BES5-1.5

Description

Manufacturer

Linear Technology Corporation

Datasheets

1.LTC3406BES5-1.5.pdf (16 pages)

2.LTC3406BES5-1.5.pdf (16 pages)

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FEATURES

TYPICAL APPLICATIO

■

APPLICATIO S

■

High Efficiency: Up to 96%

600mA Output Current at V

2.5V to 5.5V Input Voltage Range

1.5MHz Constant Frequency Operation

No Schottky Diode Required

Low Dropout Operation: 100% Duty Cycle

Low Quiescent Current: 300µA

0.6V Reference Allows Low Output Voltages

Shutdown Mode Draws < 1µA Supply Current

Current Mode Operation for Excellent Line and

Load Transient Response

Overtemperature Protected

Low Profile (1mm) ThinSOT

Cellular Telephones

Personal Information Appliances

Wireless and DSL Modems

Digital Still Cameras

MP3 Players

Portable Instruments

TO 5.5V

2.7V

Figure 1a. High Efficiency Step-Down Converter

4.7µF

CER

†

MURATA LQH32CN2R2M33

TAIYO YUDEN JMK212BJ475MG

TAIYO YUDEN JMK316BJ106ML

RUN

LTC3406B-1.8

GND

OUT

= 3V

Package

2.2µH*

3406B F01a

10µF

CER

OUT

†

1.8V

600mA

OUT

DESCRIPTIO

The LTC

nous buck regulator using a constant frequency, current

mode architecture. The device is available in an adjustable

version and fixed output voltages of 1.5V and 1.8V. Supply

current with no load is 300µA and drops to <1µA in

shutdown. The 2.5V to 5.5V input voltage range makes the

LTC3406B ideally suited for single Li-Ion battery-powered

applications. 100% duty cycle provides low dropout op-

eration, extending battery life in portable systems. PWM

pulse skipping mode operation provides very low output

ripple voltage for noise sensitive applications.

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. Low

output voltages are easily supported with the 0.6V feed-

back reference voltage. The LTC3406B is available in a low

profile (1mm) ThinSOT package. Refer to LTC3406 for

applications that require Burst Mode

Burst Mode is a registered trademark of Linear Technology Corporation.

ThinSOT is a trademark of Linear Technology Corporation.

Protected by U.S. Patents, including 6580258, 5481178.

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

Synchronous Step-Down

3406B is a high efficiency monolithic synchro-

100

0.1

Figure 1b. Efficiency vs Load Current

Regulator in ThinSOT

V OUT = 1.8V

V IN = 3.6V

V IN = 4.2V

OUTPUT CURRENT (mA)

1.5MHz, 600mA

V IN = 2.7V

100

3406B F01b

operation.

LTC3406B

1000

3406bfa

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