ISL97634_14 Datasheet, PDF (1/12 Pages) Intersil Corporation – White LED Driver with Wide PWM Dimming Range

White LED Driver with Wide PWM Dimming Range
ISL97634
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.
Related Literature
• See TB470, “Using the ISL97634 White LED Driver Demo
Board”
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)
Applications
• LED Backlighting for:
- Cell phones
- Smartphones
- MP3
- PMP
- Automotive Navigation Panel
- Portable GPS
10µH or 22µH
VIN
VIN
PWM/EN
NC
GND
LX
VOUT
FBSW
FB
FIGURE 1. TYPICAL APPLICATION CIRCUIT
August 27, 2013
FN6264.4
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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