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Skyworks - Serial LED Driver

Numéro de référence AAT1401
Description Serial LED Driver
Fabricant Skyworks 
Logo Skyworks 





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AAT1401 fiche technique
DATA SHEET
AAT1401
Serial LED Driver with Filtered PWM and 32-Step S2C Dimming Control
General Description
The AAT1401 is a step-up single channel LED driver with
an input voltage range of 2.7V to 5.5V. The wide input
voltage range, small solution size, advanced dimming
features and high efficiency is suitable for LED backlight
solutions for single cell Li-ion based equipment. A preci-
sion, high voltage current sink maintains the maximum
LED current set by an external resistor from 10 to 31mA.
The high switching frequency supports ultra small, low
cost filtering components.
Two dimming controls are available; 32 dimming steps
using the S2Cwire™ interface, and filtered PWM control.
The frequency range of the PWM dimming extends up to
100 kHz eliminating audible noise and suitable for CABC
(Content Adaptive Brightness Control) applications.
The device includes over-temperature protection and
programmable over-voltage protection and recovers
automatically when the faults are removed. The AAT1401
is available in a 10-pin wafer-level chip scale package
(WLCSP) and is rated over the -40°C to +85°C tempera-
ture range.
Features
Input Voltage Range: 2.7 to 5.5V
Drives up to 28V with 6 Series LEDs at 31mA
1MHz Switching Frequency Allows Small External
Components
Up to 85% Efficiency
Dimming Control Options:
32 Steps - S2Cwire Single Wire Interface
Filtered PWM
Low Operating Current at 2.3mA
Shutdown Current < 1µA
Over-Voltage Protection for Open-LED Faults
Over Temperature Protection
Ultra Small, Low Profile 10-pin 1.55 x 1.15mm WLCSP
Package
Applications
Digital Still Cameras (DSC)
Mobile Handsets
Netbooks and Notebooks
Portable Media Players
White LED Drivers
Typical Application
VIN:
2.7V–5.5V
CIN
4.7µF
CCOMP
56nF
D1
L1 10μH
S2C
PWM
RSET
10k
IN
LX
OVP
AAT1401
EN/SET
PWM
COMP
RSET
CS
GND PGND
R1
R2
Up to 6
WLEDs
VOUT:
Up to 28V
at 31mA
COUT
0.1µF
50V
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202113A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 27, 2012
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