LED Driver. AAT1401 Datasheet

AAT1401 Driver. Datasheet pdf. Equivalent


Skyworks AAT1401
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 • sales@skyworksinc.com • www.skyworksinc.com
202113A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 27, 2012
1


AAT1401 Datasheet
Recommendation AAT1401 Datasheet
Part AAT1401
Description Serial LED Driver
Feature AAT1401; DATA SHEET AAT1401 Serial LED Driver with Filtered PWM and 32-Step S2C Dimming Control General Desc.
Manufacture Skyworks
Datasheet
Download AAT1401 Datasheet




Skyworks AAT1401
DATA SHEET
AAT1401
Serial LED Driver with Filtered PWM and 32-Step S2C Dimming Control
Pin Descriptions
Pin #
A1
A2
A3
B1
B3
C1
C3
D1
D2
D3
Symbol
LX
IN
EN/SET
PGND
PWM
GND
COMP
CS
RSET
OVP
Function
Switching node of boost converter. Connect an inductor between LX and input supply (VIN); Schottky
rectifier anode is connected between LX pin while cathode is connected to output capacitor.
Supply input for the IC. Connect a 4.7µF 6.3V/10V ceramic capacitor from this pin to GND.
Enable on/off control and S2Cwire interface input.
Power ground pin.
Input PWM pin. Pull high to disable the PWM dimming feature.
Ground pin.
Compensation pin. Connect a capacitor from this pin to GND. Compensation components are mainly
related to the output capacitor valued. See the Capacitor Selection section in the Application Infor-
mation section of this datasheet.
Connect to the cathode of the last diode of the LED string.
Connect a resistor to GND to set maximum LED current up to 31mA.
Feedback pin for over-voltage protection.
Pin Configuration
WLCSP10 1.1 x1.5
(Top View)
A1 A2 A3
B1 B3
C1 C3
D1 D2 D3
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
2 202113A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 27, 2012



Skyworks AAT1401
DATA SHEET
AAT1401
Serial LED Driver with Filtered PWM and 32-Step S2C Dimming Control
Absolute Maximum Ratings1
Symbol
VIN
VLX
VCS
VEN/SET,VPWM, VRSET,
VCOMP, VOVP
Description
IN to GND, PGND
LX to GND, PGND
SINK to GND, PGND
EN/SET, PWM, RSET, COMP, OVP to GND/PGND
Value
-0.3 to 6.0
-0.3 to 34
-0.3 to 28
-0.3 to IN +0.3
Units
V
V
V
V
Thermal Information2
Symbol
ΘJA
PD
TJ
TLEAD
Description
Thermal Resistance
Maximum Power Dissipation
Maximum Junction Operating Temperature
Maximum Soldering Temperature (at leads, 10 sec.)
Value
122
820
-40 to +155
300
Units
OC/W
mW
OC
Recommended Operating Conditions
Symbol
VIN
VOUT
L1
FPWM-F
TA
Description
Input Supply Voltage
Boosted Output Voltage
Inductor Value
Input Filtered PWM Frequency
Ambient Temperature Range
Min
2.7
VIN + 3V
4.7
100
- 40
Typ
10
Max
5.5
VOUT3
22
100,000
85
Units
V
V
μH
Hz
°C
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on an FR4 board.
3. Check Electrical Characteristics.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202113A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 27, 2012
3







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