ISL97636 Datasheet PDF - Intersil Corporation

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ISL97636
Intersil Corporation

Part Number ISL97636
Description 8-Channel LED Driver
Page 18 Pages


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®
Data Sheet
May 9, 2008
ISL97636
FN6570.0
8-Channel LED Driver
The ISL97636 is an integrated power LED driver that
controls 8 channels of LED current for LCD backlight
applications. The ISL97636 is capable of driving typically 72
(8x9) pieces of 3.5V/30mA or 80 (8x10) pieces of
3.2V/20mA LEDs. The ISL97636’s contains 8 channels of
voltage controlled current sources with typical currents
matching of ±1%, which compensate for the non-uniformity
effect of forward voltages variance in the LED stacks. To
minimize the voltage headroom and power loss in the typical
multi-strings operation, the ISL97636 features a dynamic
headroom control that monitors the highest LED forward
voltage string and uses its feedback signal for output
regulation.
The LED brightness can be pulse width modulated with an
applied PWM signal from DC to audio noise free 20kHz.
The ISL97636 features extensive protection functions that
include string open and short circuit detections, OVP, OTP,
thermal shutdown and an optional input overcurrent
protection with master fault disconnect switch.
Available in the 24 Ld 4mmx4mm QFN, the ISL97636
operates from -40°C to +85°C with input voltage ranges from
6V to 24V for high LEDs count applications.
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL97636IRZ* 976 36IRZ 24 Ld 4x4 QFN L24.4x4D
*Add “-T” or “-TK” suffix for tape and reel. 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.
Features
• 8 Channels
• 6V to 24V Input
• 34.5V Output Max
• Drive Maximally 72 (3.5V/30mA each) or 80 (3.2V/20mA
each) LEDs
• Current Matching ±1% Typ
• Dynamic Headroom Control
• PWM Signal up to 20kHz Dimming
• Protections
- String Open Circuit Detection
- String Short Circuit Detection with Selectable Thresholds
- Over-Temperature Protection
- Overvoltage Protection
- Optional Input Overcurrent Protection w/Disconnect SW
• 1.2MHz Switching Frequency
• 24 Ld 4mmx4mm QFN Package
• Pb-Free (RoHS compliant)
Applications
• Notebook Displays LED Backlighting
• LCD Monitor LED Backlighting
• Automotive Displays LED Backlighting
• Automotive or Traffic Lighting
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.



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Typical Application Circuit
VBL+ = 6V TO 24V
ISL97636
VOUT = 34.5V, 30mA PER STRING
ISL97636
21 FAULT
LX 19
LX 20
23 VIN
OVP 16
24 VDC PGND 17
PGND 18
22 COMP IIN0 15
6 PWMI/EN IIN1 14
11 RSET
IIN2 13
IIN3 12
5 GND
IIN4 10
IIN5 9
IIN6 8
IIN7 7
2 FN6570.0
May 9, 2008



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Block Diagram
VBL+ = 6V TO 24V
ISL97636
34.5V, 30mA PER STRING
(8 x 9 = 72 LEDS)
VIN
VDC
REG
OSC AND
RAMP
COMP
FAULT
O/P SHORT
FAULT DETECT
Σ =0
IMAX ILIMIT
LOGIC
FET
DRIVER
LX
OVP
PGND
COMP
RSET
GND
PWMI/EN
GM
AMP
REFERENCE
GENERATOR
HIGHEST VF
STRING
DETECT
+
-
FAULT DETECT
ISL97636
+
-
PWM
GENERATOR
PWM/OC/SC
OC, SC
DETECT
IIN0
IIN7
OC, SC
DETECT
FAULT DETECT
TEMP
SENSOR
+
-
FAULT/DETECT
FIGURE 1. ISL97636 BLOCK DIAGRAM
3 FN6570.0
May 9, 2008



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ISL97636
Absolute Maximum Ratings (TA = +25°C)
VIN, FAULT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 24V
VDC, COMP, RSET, EN/PWM . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
OVP, IIN0 - IIN7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 28V
LX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 36V
PGND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
Above voltage ratings are all with respect to GND pin
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Thermal Information
Thermal Resistance (Typical, Notes 1, 2) θJA (°C/W) θJC (°C/W)
24 Ld QFN . . . . . . . . . . . . . . . . . . . . . .
39
2
Thermal Characterization (Typical, Note 3)
PSIJT (°C/W)
24 Ld QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ~0.7
Maximum Continuous Junction Temperature . . . . . . . . . . . . +125°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests
are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTES:
1. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379.
2. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside assumed under ideal case temperature.
3. PSIJT is the junction-to-top thermal resistance. If the package top temperature can be measured, with this rating then the die junction temperature
can be estimated more accurately than the θJC and θJC thermal resistance ratings.
4. Limits established by characterization and are not production tested.
Electrical Specifications
All specifications below are tested at TA = -40°C to +85°C; VIN = 12V, EN = 5V, RSET = 36.6kΩ; Parameters
with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits
established by characterization and are not production tested.
PARAMETER
DESCRIPTION
CONDITION
MIN
TYP
MAX
UNIT
GENERAL
VIN
Backlight Supply Voltage
9 LEDs per channel
6
(3.5V/30mA type)
24 V
IVIN_STBY
VIN Shutdown Current
5 µA
VOUT
Vuvlo
Output Voltage
Undervoltage Lockout Threshold
34.5 V
2.45 2.8 V
Vuvlo_hys
Undervoltage Lockout Hysteresis
300 mV
SS Soft-start
1 ms
PWM GENERATOR
EN/PWM
EN/PWM Voltage Range
2.7 5.5 V
ENmin
Minimum Enable Signal
40 µs
tMAX_PWM_OFF Maximum PWMI Off Time Before
Shutdown
EN/PWMI toggles
28 ms
REGULATOR
VDC
IVDC_STBY
LDO Output Voltage
Standby Current
VIN > 6V
EN/PWM = 0V
5.0
5.5 V
20 µA
IVDC
Active Current
EN/PWM = 5V
10 mA
VLDO
BOOST
VDC LDO Dropout Voltage
VIN > 5.5V, 30mA
30 200 mV
SWILimit
rDS(ON)
Boost FET Current Limit
Internal Boost Switch ON-Resistance
TA = +25°C
TA = -40°C, +85°C
2.3 3.2 A
2.2 A
130 260 mΩ
4 FN6570.0
May 9, 2008



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