AS3687 Overview
The AS3687/87XM is a highly-integrated CMOS Lighting Management Unit for mobile telephones, and other 1-cell Li+ or 3-cell NiMH powered devices. The AS3687/87XM incorporates one Step Up DC/DC Converter for white backlight LEDs, one low noise Charge Pump for indicator- or RGB- LEDs, LED test circuit (production test of the soldered LEDs at the customer site), one Analog-to-Digital Converter, seven current sinks, a...
AS3687 Key Features
- High-Efficiency Step Up DC/DC Converter
- Up to 25V/50mA for White LEDs
- Programmable Output Voltage with External Resistors and Serial Interface
- Overvoltage Protection
- High-Efficiency Low Noise Charge Pump
- 1:1, 1:1.5, and 1:2 Mode
- Automatic Up Switching (can be disabled and 1:2 mode can be blocked)
- Output Current up to 150mA
- Efficiency up to 95%
- Only 4 External Capacitors Required: 2 x 500nF Flying Capacitors, 2 x 1µF Input/Output Capacitors