ISL97632

LED Driver with 1-Wire Dimming

OVERVIEW

The ISL97632 represents an efficient and highly integrated PWM boost LED driver that is suitable for 1.8" to 3.5" LCDs that employ 2 to 7 white LEDs for backlighting. With integrated Schottky diode, OVP, and dynamic digital dimming capability, the ISL97632 provides a simple, reliable, and flexible solution to the backlight designers.

The ISL97632 features a simple 1-Wire digital interface that provides a 5-bit dimming control. The dimming signal adjusts the FB voltage and therefore the LED brightness in a DC manner in 32 linear steps. An EN pin can be used to provide a zero brightness setting or shutdown power saving function.

The ISL97632 is available in the 8 Ld TDFN (2mmx3mm) package. There are 14V, 18V, and 26V OVP options that are suitable for 3, 4, and 7 LEDs (3.5V/20mA type) backlight applications respectively. The ISL97632 is specified for operation over the -40°C to +85°C ambient temperature at input voltage from 2.4V to 5.5V.

KEY FEATURES

  • 1-Wire 5-Bit Digital Dimming
  • Drives Up to 7 LEDs in Series (3.5V/20mA type)
  • OVP (14V, 18V and 26V for 3, 4, and 7 LEDs applications)
  • Integrated Schottky Diode
  • 2.4V to 5.5V input
  • 86% Efficiency
  • 1.4MHz Switching Frequency Allows Small LC
  • Enable for Shutdown Function or Zero Brightness Setting
  • 1µA Shutdown Current
  • Internally Compensated
  • 8 Ld TDFN (2mmx3mm)
  • Pb-Free (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL97632
Basic Information
Production Status
Mass Production
# of Devices/ Channels
1
Total Current for DC/DC Lighting (mA)
40
Output Current Max/Channel (mA)
40
Output Voltage Max (V)
27
Brightness Control
Digital 5-Bit Dimming
Bus/Output Interface
Single Wire
Input Voltage Max (V)
5.5
Input Voltage Min (V)
2.4
Backlight for LCD Size (min) (in)
1.8
Backlight for LCD Size (max) (in)
3.5
Qualification Level
Standard
Peak Efficiency (%)
86
# of LEDs (max)
7
Frequency
1.4 MHz
IS (max)
1.5 mA
IQ (max)
1 µA
ISW (typ) (mA)
470
Integrated Diode
Yes
Over Voltage Protection
Yes
Fault Switch
Yes
Topologies
Inductor Boost
Input Voltage Range (V)
2.4 to 5.5
Backlight for LCD Size
1.8 to 3.5
Can Sample
YES
Temperature Range
-40 to +85

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