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Rohm Semiconductor Electronic Components Datasheet

BD8112EFV-M Datasheet

White Backlight LED Drivers

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Power Management ICs for Automotive Body Control
White Backlight LED Drivers
for Medium to Large LCD Panels
(Switching Regulator Type)
BD8112EFV-M
No.11039ECT11
Description
BD8112EFV-M is a white LED driver with the capability of withstanding high input voltage (36V MAX). This driver has
2ch constant-current drivers integrated in 1-chip, which each channel can draw up to 150mA max, so that high brightness
LED driving can be realized. Furthermore, a current-mode buck-boost DC/DC controller is also integrated to achieve stable
operation against voltage input and also to remove the constraint of the number of LEDs in series connection.
The brightness can be controlled by either PWM or VDAC techniques.
Features
1) Input voltage range 5.0 -30 V
2) Integrated buck-boost current-mode DC/DC controller
3) Two integrated LED current driver channels (150 mA max. each channel)
4) PWM Light Modulation (Minimum Pulse Width 25µs)
5) Oscillation frequency accuracy ±5%
6) Built-in protection functions (UVLO, OVP, TSD, OCP, SCP)
7) LED abnormal status detection function (OPEN/ SHORT)
8) HTSSOP-B24 package
Applications
Backlight for display audio, small type panels, etc.
Absolute maximum ratings (Ta=25)
Parameter
Symbol
Ratings
Unit
Power supply voltage
VCC 36 V
BOOT , OUTH Voltage
SW, CS Voltage
VBOOT, VOUTH
VSW, VCS
41 V
36 V
BOOT-SW Voltage
VBOOT-SW
LED output voltage
VLED1,2
VREG, OVP, OUTL, FAIL1, FAIL2,
LEDEN, ISET, VDAC, PWM, SS, COMP,
RT, SYNC, EN voltage
VVREG, VOVP, VOUTL, VFAIL1, VFAIL2,
VLEDEN, VISET, VVDAC, VPWM, VSS, VCOMP,
VRT, VSYNC, VEN
Power Consumption
Pd
7
36
-0.37 < VCC
1.10 *1
V
V
V
W
Operating temperature range
Topr
-40+105
Storage temperature range
Tstg
-55+150
LED maximum output current
ILED
150 *2 *3
mA
Junction temperature
Tjmax
150
*1 IC mounted on glass epoxy board measuring 70mm × 70mm × 1.6mm, power dissipated at a rate of 8.8mw/at temperatures above 25.
*2 Dispersion figures for LED maximum output current and VF are correlated. Please refer to data on separate sheet.
*3 Amount of current per channel.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/22
2011.08 - Rev.C


Rohm Semiconductor Electronic Components Datasheet

BD8112EFV-M Datasheet

White Backlight LED Drivers

No Preview Available !

BD8112EFV-M
Technical Note
Operating conditions (Ta=25)
Parameter
Symbol
Limits
Unit
Power supply voltage
VCC 5.030 V
Oscillating frequency range
FOSC
250600
kHz
External synchronization
frequency range *4 *5
FSYNC
fosc600
kHz
External synchronization
pulse duty range
FSDUTY
4060
%
*4 Connect SYNC to GND or OPEN when not using external frequency synchronization.
*5 Do not switch between internal and external synchronization when an external synchronization signal is input to the device.
Electrical characteristics (Unless otherwise specified, VCC=12V Ta=25)
Parameter
Symbol
Min
Limits
Typ Max.
Circuit current
ICC - 7 14
Unit Conditions
mA
EN=Hi, SYNC=Hi, RT=OPEN
PWM=Low, ISET=OPEN, CIN=10µF
Standby current
[VREG Block (VREG)]
IST - 4 8 µA EN=Low
Reference voltage
[OUTH Block]
VREG
4.5
5
5.5
V IREG=-5mA, CREG=2.2µF
OUTH high-side ON resistance
RONHH 1.5 3.5 7.0
Ω ION=-10mA
OUTH low-side ON resistance
Over-current protection
operating voltage
[OUTL Block]
OUTL high-side ON resistance
RONHL 1.0 2.5 5.0
VOLIMIT
VCC
-0.66
VCC
-0.6
VCC
-0.54
Ω ION=10mA
V
RONLH 2.0 4.0 8.0
Ω ION=-10mA
OUTL low –side ON resistance
[SW Block]
SW low -side ON resistance
[Error Amplifie Block]
LED voltage
RONLL 1.0 2.5 5.0
RON_SW
2.0
4.5
9.0
VLED
0.9 1.0 1.1
Ω ION=10mA
Ω ION_SW=10mA
V
COMP sink current
ICOMPSINK
15
25
35
µA VLED=2V, Vcomp=1V
COMP source current
[Oscillator Block]
ICOMPSOURCE -35 -25 -15 µA VLED=0V, Vcomp=1V
Oscillating frequency
FOSC
285 300 315 KHz RT=100kΩ
This product is not designed for use in radioactive environments.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
2/22
2011.08 - Rev.C


Part Number BD8112EFV-M
Description White Backlight LED Drivers
Maker ROHM
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