LTC3426 데이터 시트보기 (PDF) - Linear Technology

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LTC3426

1.2MHz Step-Up DC/DC Converter in SOT-23

Linear Technology 

LTC3426

1.2MHz Step-Up DC/DC

Converter in SOT-23

FEATURES

■ Internal 2A MOSFET Switch

■ 1.2MHz Switching Frequency

■ Integrated Soft-Start

■ Low 1.6V VIN Operation

■ Low RDS(ON) Switch: 100mΩ at 5V Output

■ Delivers 5V at 800mA from a 3.3V Input

■ Delivers 3.3V at 800mA from a 2.5V Input

■ Uses Small, Low Profile External Components

■ Low Profile (1mm) SOT-23 (ThinSOTTM) Package

U

APPLICATIO S

■ White LED Driver Supply

■ Local 3.3V or 5V Supply

■ Battery Back-Up

TYPICAL APPLICATIO

3.3V to 5V Boost Converter

2.2µH

VIN

3.3V

10µF

SW

VIN

VOUT

LTC3426

OFF ON

SHDN FB

GND

VOUT

5V

800mA

22µF

3426 TA01

DESCRIPTIO

The LTC®3426 step-up switching regulator generates an

output voltage of up to 5.5V from an input voltage as low

as 1.6V. Ideal for applications where space is limited, it

switches at 1.2MHz, allowing the use of tiny, low cost and

low profile external components. Its internal 2A, 100mΩ

NMOS switch provides high efficiency even at heavy load,

while the constant frequency, current mode architecture

results in low, predictable output noise that is easy to filter.

Antiringing circuitry reduces EMI concerns by damping

the inductor while in discontinuous mode, and internal

soft-start eases inrush current worries. Internal frequency

compensation is designed to accommodate ceramic out-

put capacitors, further reducing noise. The device features

very low shutdown current of 0.5µA.

The LTC3426 is available in the 6-lead SOT-23 package.

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

ThinSOT is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

Protected by U.S. Patents, including 6498466, 6611131

Efficiency

100

VIN = 3.3V

95 VOUT = 5V

90

85

80

75

70

65

60

55

50

1

10

100

LOAD CURRENT (mA)

1000

3426 TA01b

3426fa

1

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