Description

The AS3676 is a highly-integrated CMOS Power and Lighting Management Unit for mobile phones, and other 1-cell Li+ or 3-cell NiMH powered devices.

The AS3676 incorporates one Step Up DC-DC Converter for white backlight LEDs, one high-power Charge Pump, one Analog-to-Digital Converter, 13 current sinks, LED in-circuit function test, a two wire serial interface, and control logic all onto a single device.

It supports Ambient Light Sensor (ALS) processing and a Dynamic Luminance Scaling (DLS) input. Output voltages and output currents are fully programmable.

The AS3676 is part of the ams LMU family. It is software compatible to AS3687/87XM and AS3689 and pin and software compatible to AS3675.

Key Features

• High-Efficiency Step Up DC/DC Converter programmble up to 26V/50mA
• High-Efficiency High-Power Charge Pump (1:1, 1:1.5, 1:2 Modes)
• 13 Fully Programmable Current Sinks
• Dynamic Luminance Scaling (DLS) support to improve backlight operating time (all current sources adjustable)
• Abient Light Sensor (ALS) input with internal hardware processing
• Internal PWM Generation with Autonomous Logarithmic up/down Dimming
• LED Pattern Generator for Autonomous Funlight, Smartlight and Indicator Effects
• 10-bit Successive Approximation ADC
• Automatic LED testing (open and shorted LEDs can be identified)
• Strobe Timeout protection (up to 1.6s)
• Three General Purpose Inputs/Output
• Programmable LDO (1.8 to 3.35V, 150mA)
• Audio Synchronized LED Effects
• Wide Battery Supply Range: 3.0 to 5.5V
• Two Wire Serial Interface Control
• Over current and Thermal Protection
• WL-CSP30 3x2.5mm, 0.5mm pitch Package

Applications

• Smartphones
• Feature Phones
• Mobile Phones
• Portable DVD / TV Player
• Portable Learning Toys
• Portable Navigation Devices
• Portable Medical Consumer Devices

Block diagram for AS3676 - Lighting Management Unit with Audio Sync & ALS/DLS