ISL97632_08 Datasheet, PDF (1/9 Pages) Intersil Corporation – White LED Driver with Digital Dimming

®
Data Sheet
February 22, 2008
ISL97632
FN9239.3
White LED Driver with Digital Dimming
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 6 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 single-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 6 LEDs 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.
Pinout
ISL97632
(8 LD 2x3 TDFN)
TOP VIEW
GND ₁
VIN 2
EN 3
SDIN 4
8 ^LX
7 VOUT
6 FBSW
5 FB
Typical Application Circuit
10µH or 22µH
VIN
VIN
EN
SDIN
GND
LX
VOUT
FBSW
FB
Features
• 5-Bit Digital Dimming Control
• Drives up to 6 LEDs in Series
• OVP (14V, 18V and 26V for 3, 4, and 6 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)
Applications
• LED backlighting for
- Cell phones
- Smartphones
- MP3
- PMP
- Automotive Navigation Panel
- Portable GPS
Ordering Information
PART NUMBER
(Note)
PACKAGE
PART TAPE AND REEL
MARKING
(Pb-Free)
PKG.
DWG.#
ISL97632IRT14Z-T* ELB
8 Ld 2x3 TDFN
L8.2x3A
ISL97632IRT14Z-TK* ELB
8 Ld 2x3 TDFN
L8.2x3A
ISL97632IRT18Z-T* ELC
8 Ld 2x3 TDFN
L8.2x3A
ISL97632IRT18Z-TK* ELC
8 Ld 2x3 TDFN
L8.2x3A
ISL97632IRT26Z-T* ELD
8 Ld 2x3 TDFN
L8.2x3A
ISL97632IRT26Z-TK* ELD
8 Ld 2x3 TDFN
L8.2x3A
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach
materials and 100% matte tin plate PLUS ANNEAL - e3 termination
finish, which is RoHS compliant and compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J STD-020.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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