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.