DATA SHEET
AHK3292
Two-Channel LED Driver
General Description Features
The AHK3292 is a linear current-sink LED driver, capable 2.7V to 5.5V Input Supply Range
of driving one or two LEDs up to 30.2mA each. Featuring Drives up to 2 LEDs at up to 30.2mA each
individual low resistance, low drop-out voltage current Low Resistance Current Sinks
sinks, the AHK3292 allows the LEDs to be regulated Low Dropout, Typically 40.5mV at Full Scale
directly from a Lithium Ion/Polymer battery without the Linear LED Output Current Control
2
need for an additional step-up power supply, thereby S Cwire Interface
reducing the external component count, eliminating Single-wire
switching noise and maximizing efficiency. 32 Steps
10% LED Output Current Accuracy
2
Skyworks' Simple Serial Control (S Cwire) interface
3% LED Output Current Matching
is used to enable, disable, and set the LED drive current
Low Current Shutdown Mode
for 32-level linear scale LED brightness control. For
Low Cost 6-pin SOT23 Package
maximum flexibility the LED current can be set, up to a
maximum of 30.2mA per channel, using an external R
SET
resistor.
Applications
The AHK3292 is packaged in a Pb-free 6-pin SOT23
Entry Level Mobile Phones
O
package and is available over a -40 to +85 C tempera-
Indicator LEDs
ture range.
Keyboard Backlight
MP3 Players
Typical Application Circuit
Input Voltage
2.7V to 5.5V
C
IN
IN
AHK3292
EN/SET
EN
2
S Cwire
D1
Interface
D2
RSET
GND
R
SET
9.53k
Skyworks Solutions, Inc. Phone [781] 376-3000 Fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com
1
202170A Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice. July 13, 2012 DATA SHEET
AHK3292
Two-Channel LED Driver
Pin Descriptions
Pin # Symbol Function Description
2 2
S Cwire serial input. EN is used for ON/OFF control. EN is also the data input for the S Cwire
1 EN I
interface used to control the 32 levels of LED brightness according to the current set by RSET.
2 GND I/O Ground. Connect this pin to the system ground.
Input power pin. Connect IN to the power source, typically the battery. Bypass IN to GND with
3 IN I
a 1F or larger ceramic capacitor.
Backlight LED 2 current sink output. Connect the cathode of LED 2 to D2. If not used, connect
4 D2 O
D2 to IN.
Connect resistor from this pin to GND to set the maximum LED current level. For optimal LED
5 RSET I output current accuracy and matching in the AHK3292, use a 9.53k 1% resistor to set each
full-scale output current to 30.2mA maximum.
Backlight LED 1 current sink output. Connect the cathode of LED 1 to D1. If not used, connect
6 D1 O
D1 to IN.
Pin Configuration
SOT23-6
(Top View)
6
1
EN D1
2 5
GND RSET
3 4
IN D2
Skyworks Solutions, Inc. Phone [781] 376-3000 Fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com
2
202170A Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice. July 13, 2012