1
FN9239.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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ISL97632
LED Driver with 1-Wire 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 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.
Pinout
ISL97632
(8 LD 2x3 TDFN)
TOP VIEW
Typical Application Circuit
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)
Applications
• LED backlighting for
- Cell phones
- Smartphones
-MP3
-PMP
- Automotive Navigation Panel
- Portable GPS
2
3
4
1
7
6
5
8
GND
VIN
EN
SDIN
LX
VOUT
FBSW
FB
VIN
LX
FBSW
GND
VIN
EN
FB
VOUT
SDIN
10µH OR 22µH
Ordering Information
PART NUMBER
(Note)
PART
MARKING
TEMP
RANGE
(°C)
PACKAGE
Tape and Reel
(Pb-Free)
PKG.
DWG.
NO.
ISL97632IRT14ZT* ELB -40 to +85 8 Ld 2x3 TDFN L8.2x3A
ISL97632IRT14ZTK* ELB -40 to +85 8 Ld 2x3 TDFN L8.2x3A
ISL97632IRT18ZT* ELC -40 to +85 8 Ld 2x3 TDFN L8.2x3A
ISL97632IRT18ZTK* ELC -40 to +85 8 Ld 2x3 TDFN L8.2x3A
ISL97632IRT26ZT* ELD -40 to +85 8 Ld 2x3 TDFN L8.2x3A
ISL97632IRT26ZTK* ELD -40 to +85 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.
Data Sheet March 22, 2010
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