LT3154

1

Rev. 0

For more information www.analog.com

Document Feedback

TYPICAL APPLICATION

FEATURES

DESCRIPTION

6A Low Noise, High Performance

Buck-Boost DC/DC Converter

The LT®3154 is a highly efficient, high current, buck‑boost

DC/DC converter that operates from input voltages

above, below or equal to the regulated output voltage.

The LT3154’s advanced topology provides a continu‑

ous transfer through all operating modes. VIN operation

from 1.8V to 5.5V provides flexibility for a wide variety of

power sources. The output voltage is adjustable between

1.8V to 5.5V.

To minimize external components the LT3154 can be

configured to operate from a 2.2MHz internal oscillator.

To optimize applications for highest efficiency or small‑

est footprint the oscillator can be programmed between

400kHz to 4MHz, or synchronized to an external clock for

noise sensitive circuits.

Selectable Burst Mode operation reduces quiescent cur‑

rent to 15μA, ensuring high efficiency across the entire

load range. The VIN start‑up threshold (UVLO) can be

adjusted for various input sources. An internal or exter‑

nally programmable soft‑start limits inrush current

during start‑up. Other features include <1μA shutdown

current, short circuit, and thermal overload protection.

The LT3154 is housed in the thermally enhanced 16‑lead

(3mm × 3mm × 0.75mm) LQFN package.

Efficiency vs VIN PWM Mode

APPLICATIONS

n

Single Inductor Buck-Boost Architecture

n

Low Noise Buck-Boost Architecture

n

Wide VIN Range 1.8V to 5.5V

n

Adjustable VOUT Range 1.8V to 5.5V

n

5A of Continuous Output Current with VIN > VOUT

n

Up to 95% Efficiency

n

Selectable Internal 2.2MHz Fixed Frequency

Adjustable and Synchronizable: Up to 4MHz

n

Burst Mode® IQ 15µA for High Efficiency at Light Loads

n

Programmable Soft‑Start and VIN UVLO

n

Simple Solution with Minimal External Components

n

Portable Inventory Terminals

n

Handheld Computers

n

Medical and Industrial Instruments

n

Wireless RF Transmitter

n

Backup Power Applications

n

Battery Powered Systems

All registered trademarks and trademarks are the property of their respective owners.

4A

3A

2A

1A

0.5A

INPUT VOLTAGE (V)

1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4 5.8

80

82

84

86

88

90

92

94

96

98

3154 TA01b

LOAD CURRENT

2.2MHz OPERATION

VOUT

3.3V

VIN

1.8V TO 5.5V

BURST

3154 TA01a

PWM

22µF

100µF

1nF

40.2k

100k

232k

0.68µH

EN/UVLO

LT3154

RT

SS

FB

VC

GND

SW1

SW2

PGND

SYNC/MODE

PVOUT

VOUT

PVIN

VIN