A8483

www.DataSheet4U.com A8483 Package EK: MLP/TDFN, 3 × 3 mm 0.75 mm Nominal Height 1.2 MHz Step-up Converter for Display Bias Supply The A8483 is a current mode step-up dc-to-dc converter, available in a 5-pin 3 mm × 3 mm thermally enhanced MLP/TDFN lead (Pb) free package. Smaller external components and integrated 36 V switch reduce component count and footprint for a variety of applications. APPLICATIONS „ „ „ „ „ „ OLED bias supply / WLED backlight Portable battery-powered equipment Cellular phones PDAs (Personal Digital Assistant) Camcorders, personal stereos, MP3 players, cameras Mobile GPS systems Approximate Scale 1:1 FEATURES „ „ „ „ „ „ „ „ 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 VOUT 5 VIN VSUPPLY C1 1 µF EN 4 Enable R2 39 kΩ L1 10 µH 1 SW D1 IOUT1 + IOUT2 = 15 mA 5 VIN L1 10 µH 1 SW D1 R1 732 kΩ FB 3 VOUT2 R2 39 kΩ D2 –12 V VOUT1 +12 V OLED A8483 GND 2 FB 3 R1 820 kΩ C2 1µ µF VSUPPLY C1 1 µF EN 4 Enable A8483 GND 2 C2 0.47 µF C3 0.47 µF Li-ion 2.5 V to 5.5 V Li-ion 2.5 V to 5.5 V C4 0.47 µF Figure 1. OLED Bias Supply. Use for cell phones, MP3 players, DSCs, and PDAs. 32 V, 18 mA VOUT 5 VIN VSUPPLY C1 1 µF 5V EN 4 Enable R2 15 kΩ L1 10 µH 1 SW D1 R1 768 kΩ for VOUT = 32 V 604 kΩ for VOUT = 25 V 25 V, 25 mA Figure 2. Small LCD Bia...