AAT1401 Datasheet, PDF (1/19 Pages) List of Unclassifed Manufacturers – FOUR-CHANNEL DIGITAL STILL CAMERA POWER SUPPLY

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
V_IN:
2.7V–5.5V
C_IN
4.7µF
C_COMP
56nF
D1
L1 10μH
R1
LX
IN
OVP
AAT1401 _R2
S²C
PWM
R_SET
10k
EN/SET
PWM
COMP
CS
RSET
GND PGND
Up to 6
WLEDs
V_OUT:
Up to 28V
at 31mA
C_OUT
0.1µF
50V
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
202113A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 27, 2012
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