AS3687XM

AS3687/87XM DDaatatsahseeht eet AS3687/87XM Flexible Lighting Management (Charge Pump, DCDC Step Up, Seven Current Sinks, ADC, LED Test, Audio Light) Technical coantmesntAsGtill valid 1 General Description 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 two wire serial interface, and control logic all onto a single device. Output voltages and output currents are fully programmable. The AS3687XM has an audio input to control one or two RGB LEDs. The AS3687/87XM is a successor to the austrimicrosystems AS3689 and therefore software compatible to the AS3689 (software written for the AS3689 can be easily reused for the AS3687/87XM). 2 Key Features ƒ 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 ƒ 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 − Supports LC...