LTC3406AIS5 View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC3406AIS5

1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

Linear Technology 

FEATURES

■ High Efficiency: Up to 96%

■ Very Low Quiescent Current: Only 20µA

■ Low Output Ripple Voltage During Burst Mode®

Operation

■ 600mA Output Current

■ 2.5V to 5.5V Input Voltage Range

■ 1.5MHz Constant Frequency Operation

■ No Schottky Diode Required

■ Low Dropout Operation: 100% Duty Cycle

■ ±2% 0.6V Reference

■ Shutdown Mode Draw ≤1µA Supply Current

■ Internal Soft-Start Limits Inrush Current

■ Current Mode Operation for Excellent Line and

Load Transient Response

■ Overtemperature Protected

■ Low Profile (1mm) ThinSOTTM Package

APPLICATIONS

■ Cellular Telephones

■ Wireless and DSL Modems

■ Digital Still Cameras

■ Media Players

■ Portable Instruments

■ Point of Load Regulation

TYPICAL APPLICATION

2.2μH

VIN

VIN

SW

4.7μF

22pF

CER

LTC3406A

RUN VFB

GND

619k

309k

3406A TA01

VOUT

1.8V

600mA

10μF

CER

LTC3406A

1.5MHz, 600mA

Synchronous Step-Down

Regulator in ThinSOT

DESCRIPTION

The LTC®3406A is a high efficiency monolithic synchro-

nous buck regulator using a constant frequency, current

mode architecture. Supply current during operation is only

20μA, dropping to ≤1μA in shutdown. The 2.5V to 5.5V

input voltage range makes the LTC3406A ideally suited

for single Li-Ion battery-powered applications. 100% duty

cycle provides low dropout operation, extending battery

runtime portable systems. Automatic Burst Mode opera-

tion increases efficiency at light loads, further extending

battery runtime.

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

feedback reference voltage. The LTC3406A is available in

a low profile (1mm) ThinSOT package.

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

ThinSOT is a registered trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

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

Efficiency vs Load Current

100

90

80

70

60

50

40

30

20

VIN = 2.7V

10

VIN = 3.6V

0 VOUT = 1.8V

VIN = 4.2V

0.1

1

10

100

1000

OUTPUT CURRENT (mA)

3406A TA01b

3406afa

1

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