ISL97634

White LED Driver with PWM Dimming

OVERVIEW

The ISL97634 represents an efficient and highly integrated PWM boost LED driver that is suitable for LED backlighting in small size LCD panels. With integrated Schottky diode, OVP, and wide range of PWM dimming capability, the ISL97634 provides a simple, reliable, and flexible solution to the backlight designers.

The ISL97634 features a wide range of PWM dimming control capability. It allows dimming frequency as low as DC to 32kHz beyond audible spectrum. The ISL97634 also features a feedback disconnect switch to prevent the output from being modulated by the PWM dimming signal that minimizes system disturbance.

The ISL97634 is available in the 8 Ld TDFN (2mmx3mm) package. There are 14V, 18V, and 26V OVP options that are suitable for various number of LEDs in series. The ISL97634 is specified for operation over the -40°C to +85°C ambient temperature at input voltage from 2.4V to 5.5V.

KEY FEATURES

  • Drives Up to 26V Output
  • Integrated over-voltage protection (OVP) of 14V, 18V, and 26V for various number of LEDs in series
  • PWM Dimming Control From DC to 32kHz
  • Output Disconnect Switch
  • Integrated Schottky Diode
  • 2.4V to 5.5V Input
  • 85% Efficiency
  • 1.4MHz Switching Frequency Allows Small LC
  • 1µA Shutdown Current
  • Internally Compensated
  • 8 Ld TDFN (2mmx3mm)
  • Pb-Free (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL97634
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
PWM DC to 32kHz
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 (%)
85
# 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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