A8483: 1.2 MHz Step-up Converter for Display Bias Supply

This device is discontinued. Samples are no longer available. Date of status change: June 2, 2014.

The A8483 is a simple five-pin 1.2 MHz current-mode step-up dc-to-dc converter. It includes an integrated 36 V FET and comes in a small 3 x 3 mm 10-lead thermally enhanced MLP/TDFN lead- (Pb) free package. It can be used in many applications (see datasheet circuits). For example, it delivers 15 V at 15 mA with 2.7 V input. Input voltage can range from 2.5 V to 10 V when connected directly to a battery or input rail. Output voltage can be set up to 35 V. Smaller external components and the integrated switch reduce component count and footprint for a variety of applications.

Applications include:

• OLED bias supply / WLED backlight
• Portable battery-powered equipment
• Cellular phones
• PDAs (Personal Digital Assistant)
• Camcorders, personal stereos, MP3 players, cameras
• Mobile GPS system

• Output voltage up to 35 V
• 2.5 to 10 V input
• 0.9 to 18 V input with separate bias supply
• Delivers 15 V at 15 mA with 2.7 V input
• Constant 1.2 MHz switching frequency provides low noise
• 350 mA switch current limit
• 1 µA shutdown current
• Low-noise PWM/analog dimming