LTC3406B-1.2 查看數據表（PDF） - Linear Technology

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LTC3406B-1.2

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

Linear Technology 

FEATURES

■ High Efficiency: Up to 96%

■ 600mA Output Current at VIN = 3V

■ 2.5V to 5.5V Input Voltage Range

■ 1.5MHz Constant Frequency Operation

■ No Schottky Diode Required

■ Low Quiescent Current: 300µA

■ Shutdown Mode Draws < 1µA Supply Current

■ Current Mode Operation for Excellent Line and

Load Transient Response

■ Overtemperature Protected

■ Low Profile (1mm) ThinSOTTM Package

U

APPLICATIO S

■ Cellular Telephones

■ Personal Information Appliances

■ Wireless and DSL Modems

■ Digital Still Cameras

■ MP3 Players

■ Portable Instruments

LTC3406B-1.2

1.5MHz, 600mA

Synchronous Step-Down

Regulator in ThinSOT

DESCRIPTIO

The LTC®3406B-1.2 is a high efficiency monolithic syn-

chronous buck regulator using a constant frequency,

current mode architecture. Supply current with no load is

300µA dropping to <1µA in shutdown. The 2.5V to 5.5V

input voltage range makes the LTC3406B-1.2 ideally suited

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

cycle provides low dropout operation, extending battery

life in portable systems. PWM pulse skipping mode opera-

tion 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. The

LTC3406B-1.2 is available in a low profile (1mm) ThinSOT

package.

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

trademarks are the property of their respective owners. ThinSOT is a trademark of Linear

Technology Corporation. Protected by U.S. Patents including 5481178, 6580258, 6304066,

6127815, 6498466, 6611131.

TYPICAL APPLICATIO

VIN

2.7V TO 5.5V

High Efficiency Step-Down Converter

CIN

4.7µF

CER

VIN

SW

LTC3406B-1.2

RUN VOUT

GND

2.2µH

3406B12 TA01a

COUT

10µF

CER

VOUT

1.2V

600mA

Efficiency and Power Loss

100

1

90

80

EFFICIENCY

0.1

70

60

50

40

30

20

10

0.1

0.01

POWER LOSS

0.001

VIN = 2.7V

VIN = 3.6V

VIN = 4.2V 0.0001

1

10

100

1000

LOAD CURRENT (mA)

3406B12 TA01b

sn3406b12 3406b12fs

1

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