器件名称: A8483
功能描述: 1.2 MHz Step-up Converter for Display Bias Supply
文件大小: 328.62KB 共9页
简 介: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 F EN 4 Enable R2 39 kΩ L1 10 H 1 SW D1
IOUT1 + IOUT2 = 15 mA 5 VIN L1 10 H 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 1 F
VSUPPLY
C1 1 F EN 4 Enable
A8483 GND 2
C2 0.47 F
C3 0.47 F
Li-ion 2.5 V to 5.5 V
Li-ion 2.5 V to 5.5 V
C4 0.47 F
Figure 1. OLED Bias Supply. Use for cell phones, MP3 players, DSCs, and PDAs. 32 V, 18 mA
VOUT 5 VIN VSUPPLY C1 1 F 5V EN 4 Enable R2 15 kΩ L1 10 H 1 SW D1 R1 768 kΩ for VOUT = 32 V 604 kΩ for VOUT = 25 V 25 V, 25 mA
Figure 2. Small LCD Bias Supply. Li+ battery to ±12 V.
Connect either……
