ISL97635 Datasheet PDF - Intersil Corporation

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ISL97635
Intersil Corporation

Part Number ISL97635
Description SMBus 8-Channel LED Driver
Page 28 Pages


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®
Data Sheet
December 22, 2008
ISL97635
FN6434.2
SMBus 8-Channel LED Driver
The ISL97635 is a digitally controlled LED driver that
controls 8 channels of LED current for LCD backlight
applications. The ISL97635 is capable of driving typically 72
(8x9) pieces of 3.5V/30mA or 80 (8x10) pieces of
3.2V/20mA LEDs. The ISL97635’s 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 ISL97635 features a dynamic headroom
control that monitors the highest LED forward voltage string
and uses its feedback signal for output regulation.
The LED dimming control can be achieved through a
SMBus, an external PWM, or a variable DC (analog light
sensor) input. SMBus controlled dimming allows 256 levels
each of PWM and DC current adjustments. The SMBus
PWM dimming frequency can be adjusted from 100Hz to
5kHz by an external capacitor. External PWM input allows up
to 20kHz audio noise free PWM dimming. The SMBus PWM
setting and an external PWMI signal can also be combined
to provide a dynamic PWM dimming that complies with
Intel’s DPST (Display Power Saving Technology)
requirement.
One or more channels can be selected sequentially in any
order, allowing scrolling in RGB LED backlighting
applications.
The ISL97635 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. The fault
conditions will be recorded in the Fault/Status register. There
are selectable short-circuit thresholds and the switching
frequency can be programmed between 600kHz and
1.2MHz.
Available in the 24 Ld 4mmx4mm QFN, the ISL97635
operates from -40°C to +85°C with input voltage ranging
from 6V to 24V.
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
• Dimming Controls
- SMBus 8-Bit PWM Current Control
- SMBus 8-Bit DC Current Control
- External PWM Input up to 20kHz Dimming
- SMBus and External PWM DPST Dimming Control
- DC-to-PWM Dimming Control
• Protections
- String Open Circuit Detection
- String Short Circuit Detection with Selectable Thresholds
- Over-Temperature Protection
- Overvoltage Protection
- Input Overcurrent Protection with Disconnect Switch
• 600kHz/1.2MHz Selectable fSW
• Selectable Channels Allows Scrolling Backlight
• 24 Ld (4mmx4mm) QFN Package
• Pb-Free (RoHS compliant)
Applications
• Notebook Displays WLED or RGB LED Backlighting
• LCD Monitor LED Backlighting
• Automotive Displays LED Backlighting
• Automotive or Traffic Lighting
Ordering Information
PART NUMBER
PART
(Note)
MARKING
ISL97635IRZ* 976 35IRZ
PACKAGE
(Pb-free)
24 Ld 4x4 QFN
PKG.
DWG. #
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.
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
ISL97635
VOUT = 34.5V, 30mA PER STRING
ISL97635
21 FAULT
LX 19
LX 20
23 VIN
OVP 16
24 VDC PGND 17
PGND 18
22 COMP IIN0 15
1 SMBCLK IIN1 14
2 SMBDAT IIN2 13
6 PWMI/EN IIN3 12
4 PWMO IIN4 10
11 RSET IIN5 9
IIN6 8
3 FPWM IIN7 7
5 GND
2 FN6434.2
December 22, 2008



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ISL97635
Block Diagram
VBL+ = 6V TO 24V
34.5V, 30mA PER STRING
(8x9 = 72 WHITE LEDS)
VIN
VDC
REG
OSC AND
RAMP
COMP
fPWM LED PWM
CONTROL
FAULT
ISL97635
FAULT/STATUS
REGISTER
Σ =0
LOGIC
FET
DRIVER
IMAX ILIMIT
LX
OVP
PGND
COMP
RSET
GND
SMBCLK
SMBDAT
PWMI
PWMO
GM
AMP
REFERENCE
GENERATOR
+
-
HIGHEST VF
STRING
DETECT
+
-
SMBUS
INTERFACE
REGISTERS
PWM BRIGHTNESS CONTROL
DEVICE CONTROL
FAULT/STATUS
PWM/OC/SC
IDENTIFICATION
AM
DC BRIGHTNESS CONTROL
CONFIGURATION
OC, SC
DETECT
IIN0
IIN7
OC, SC
DETECT
FAULT/STATUS
REGISTER
TEMP
SENSOR
+
-
FAULT/STATUS
REGISTER
FIGURE 1. ISL97635 BLOCK DIAGRAM
3 FN6434.2
December 22, 2008



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ISL97635
Absolute Maximum Ratings (TA = +25°C)
VIN, FAULT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 24V
VDC, COMP, RSET . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
SMBCLK, SMBDAT, FPWM, PWMO, 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.
3. PSIJT is the PSI junction-to-top thermal characterization parameter. 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,
unless otherwise noted. 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 24 V
(3.5V/30mA type)
IVIN_STBY
VOUT
VUVLO
VUVLO_HYS
REGULATOR
VIN Shutdown Current
Output Voltage
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
2.45
300
5
34.5
2.8
µA
V
V
mV
VDC
IVDC_STBY
IVDC
VLDO
SS
LDO Output Voltage
Standby Current
Active Current
VDC LDO Dropout Voltage
Soft-Start
VIN > 6V
EN/PWM = 0V
EN/PWM = 5V
VIN > 5.5V, 30mA
5.0 5.5 V
20 µA
10 mA
30 200 mV
1 ms
ENmin
Minimum Enable Signal
40 µs
BOOST
SWILimit
rDS(ON)
Boost FET Current Limit
Internal Boost Switch ON-Resistance
TA = +25°C
TA = -40°C to +85°C
2.3 3.2
2.2
130 260
A
A
mΩ
4 FN6434.2
December 22, 2008



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