IS31BL3229 Datasheet, PDF (1/11 Pages) Integrated Silicon Solution, Inc – 8-LED BACKLIGHT DRIVER

IS31BL3229
8-LED BACKLIGHT DRIVER
GENERAL DESCRIPTION
The IS31BL3229 with a smart charge-pump circuit is a
parallel white-LED driver with eight matched 20mA
current outputs. It can supply a total output current of
160mA over an input voltage range of 2.7V to 5.5V.
IS31BL3229 typically draws less than 1µA when placed
in shutdown, and 0.7mA when operating in the no-load
and 1X mode condition. If any of the outputs are not
used, leave the pin(s) unconnected. Brightness can be
controlled by simple-series-control techniques and
external PWM signal.
IS31BL3229 is available in QFN-20 (3mm × 3mm). It
operates from 2.7V to 5.5V over the temperature range
of -40°C to +85°C.
October 2012
FEATURES
 Supply voltage: 2.7V ~ 5.5V
 1X, 1.5X operating mode
 fade in and fade out mode
 Output current can be 25mA
 32 current level and PWM intensity control
 Low input current ripple, low EMI
 90% high efficiency
 No inductors, low noise operation
 Over voltage protection on output
 Built-in thermal protection
 Automatic soft start
 Built-in thermal protection
 QFN-20 (3mm × 3mm ) package
APPLICATIONS
 Cell phone, smart phone, PDA
 Mp3, Mp4, PMP
 White LED backlighting
TYPICAL APPLICATION CIRCUIT
Figure 1 Typical Application Circuit
Note 1: PWM pin should be pulled high if modulated by EN pin only. EN pin should be pulled high if modulated with PWM pin only. Please refer
to Page 8 for detail information.
Note 2: The fade in and fade out mode is only available when shut down and enable the IC by EN pin.
Note 3: D1 must be connected and others can be floating in less than 8 LEDs application.
Note 4: The IC should be placed far away from the mobile antenna in order to prevent the EMI.
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev.A, 09/17/2012