AS3677_17 Datasheet, PDF (1/106 Pages) ams AG – High-efficiency step up DC/DC converter

General Description
AS3677
Highly Integrated Lighting
Management Unit
The AS3677 is a highly-integrated CMOS power and lighting
management unit for mobile telephones, and other Li+ battery
powered devices.
The AS3677 incorporates one step up DC/DC converter for
white backlight LEDs, one analog-to-digital converter, RGB
driver, six current sinks, LED in-circuit function test, an I²C serial
interface, and control logic all onto a single device. It includes
a charge pump to control e.g. an RGB together with an internal
pattern generator for smooth blinking effects.
It supports ambient light sensor (ALS) processing and two
Dynamic Luminance Scaling (DLS) inputs (also called Dynamic
Backlight Control - DBC).
Internally the PWM signal for DLS can be used to change the
analog current through the current sources (two channels can
be used simultaneously). This avoids noise in the system as the
changes of backlight control happen continuously without
using the PWM modulation scheme.
Output voltages and output currents are fully programmable.
The AS3677 is part of the ams AS3675, AS3687/87XM, AS3688
and AS3689 lighting management unit family. It is software
compatible to AS3675, AS3676, AS3687/87XM, AS3688 and
AS3689.
The AS3677 is available in a space-saving WL-CSP package
measuring only 2.2×2.2×0.6mm and operates over the
-30°C to 85°C temperature range.
Ordering Information and Content Guide appear at end of
datasheet.
ams Datasheet
[v1-32] 2016-Sep-27
Page 1
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