IS31BL3229

Integrated Silicon Solution, Inc. – www.issi.com

1

Rev.A, 09/17/2012

8-LED BACKLIGHT DRIVER

October 2012

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.

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



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.