1 Features

1• 2.2-V to 7-V Input Range

• 150-mA, 0.7-Ω Internal Switch

• Adjustable Output Voltage up to 20 V

• Input Undervoltage Lockout

• 0.01-μA Shutdown Current

• Uses Small Surface-Mount Components

• Small 5-Pin SOT-23 Package

2 Applications

• LCD Bias Supplies

• White-LED Backlighting

• Handheld Devices

• Digital Cameras

• Portable Applications

3 Description

The LM2705 is a micropower step-up DC-DC

converter in a small 5-pin SOT-23 package. A

current-limited, fixed-off-time control scheme

conserves operating current, which results in high

efficiency over a wide range of load conditions. The

21-V switch allows for output voltages as high as

20 V. The low 400-ns off-time permits the use of tiny,

low-profile inductors and capacitors to minimize

footprint and cost in space-conscious portable

applications. The LM2705 is ideal for LCD panels

requiring low current and high efficiency as well as

white-LED applications for cellular phone backlighting.

The LM2705 device can drive up to 3 white

LEDs from a single Li-Ion battery. The low peakinductor

current of the LM2705 makes it ideal for USB

applications.