ISL97801 Datasheet, PDF (1/19 Pages) Intersil Corporation – High Power LED Driver

®
Data Sheet
April 2, 2007
ISL97801
FN6428.1
High Power LED Driver
The ISL97801 is a high-power LED backlight driver with an
integrated 36V FET designed to drive up to 8 high-power
LEDs in series. The PWM converter runs from an internally
generated 1MHz clock. With efficiencies over 90% the
regulator provides tight control of LED current and may be
configured in either boost or buck topologies, allowing from 3
to 8 series diodes to be driven from wide input voltages.
LED light level may be controlled either by:
1. LED DC bias current set via the LEVEL pin, or
2. External low frequency PWM control via the
ENABLE/PWM pin.
In both control modes optional over temperature thermal
protection of the LED reduces the LED DC bias current
above an adjustable set temperature, protecting the LED
from thermal damage. An optional fault monitor drives an
external FET between the input supply and inductor,
providing short circuit current protection for the LED and
inductor as well as load dump protection for automotive
applications. For low cost applications the pass transistor
may be omitted and the fault pin bypassed.
The ISL97801 is packaged in a 20 Ld 4mm x 4mm QFN
package and is specified for operation over the -40°C to
+105°C temperature range.
Ordering Information
PART
NUMBER
(Note)
TAPE &
PART REEL/
MARKING QTY
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL97801ARZ 978 01ARZ - 20 Ld 4x4 QFN L20.4x4C
ISL97801ARZ-TK 978 01ARZ 13”/ 20 Ld 4x4 QFN L20.4x4C
1,000
ISL97801ARZ-T 978 01ARZ 13”/ 20 Ld 4x4 QFN L20.4x4C
6,000
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are 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.
Features
• Drives 3-8 high-power LEDs in series, up to 32V
• 2.7V to 16V input voltage range
• Boost or Buck configurable switch
• 3A integrated FET
• Automotive load dump protection
• Light output temperature compensation
• LED over-temperature protection
• LED disconnect
• PWM/analog light level control
• Small, 20 Ld 4mm x 4mm QFN package
• Pb-free plus anneal available (RoHS compliant)
Applications
• Display backlighting
- Automotive
- LCD monitor
- Notebook displays
• LED accent lighting
• Automotive lighting
Pinout
ISL97801
(20 LD 4X4 QFN)
TOP VIEW
VDC 1
VHI 2
OVP 3
SWD1 4
SWD2 5
THERMAL
PAD
15 ENL
14 MODE
13 EN/PWM
12 SWS1
11 SWS2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2007. All Rights Reserved
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