LTC3406-1.8 查看數據表（PDF） - Linear Technology

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LTC3406-1.8

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

Linear Technology 

FEATURES

■ High Efficiency: Up to 96%

■ Very Low Quiescent Current: Only 20µA

During 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

■ 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) ThinSOTTM Package

U

APPLICATIO S

■ Cellular Telephones

■ Personal Information Appliances

■ Wireless and DSL Modems

■ Digital Still Cameras

■ MP3 Players

■ Portable Instruments

LTC3406

LTC3406-1.5/LTC3406-1.8

1.5MHz, 600mA

Synchronous Step-Down

Regulator in ThinSOT

DESCRIPTIO

The LTC®3406 is a high efficiency monolithic synchro-

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 during operation is only 20µA and drops to ≤1µA

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

the LTC3406 ideally suited for single Li-Ion battery-pow-

ered applications. 100% duty cycle provides low dropout

operation, extending battery life in portable systems.

Automatic Burst Mode® operation increases efficiency at

light loads, further extending battery life.

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 LTC3406 is available in a low

profile (1mm) ThinSOT package.

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

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.

TYPICAL APPLICATIO

VIN

2.7V

TO 5.5V

CIN**

4.7µF

CER

4

VIN

3 2.2µH*

SW

LTC3406-1.8

1

5

RUN VOUT

GND

2

COUT†

10µF

CER

VOUT

1.8V

600mA

3406 F01a

*MURATA LQH32CN2R2M33

**TAIYO YUDEN JMK212BJ475MG

†TAIYO YUDEN JMK316BJ106ML

Figure 1a. High Efficiency Step-Down Converter

95

VIN = 2.7V

90

85

VIN = 3.6V

80

VIN = 4.2V

75

70

65

60

0.1

VOUT = 1.8V

1

10

100

OUTPUT CURRENT (mA)

1000

3406 F01b

Figure 1b. Efficiency vs Load Current

3406fa

1

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