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Rohm Semiconductor Electronic Components Datasheet

BD8118FM Datasheet

White LED Driver IC

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TECHNICAL NOTE
For LCD Panel Backlight Applications
White LED Driver IC
BD8118FM
rev. 1.50
Outline
BD8118FM is a white LED driver featuring a high input voltage range (36V MAX), an integrated step-up DC/DC converter
and four constant-current output drivers on a single chip. Brightness can be controlled by either PWM or VDAC methods.
Features
1) Input voltage range4.5 – 30 V
2) Integrated step-up DC/DC controller
3) Four integrated LED current driver channels (150 mA max. each channel)
4) Compatible with PWM light-modulation 0.38 – 99.5%)
5) Built-in protection functions (UVLO, OVP, TSD, OCP)
6) Abnormal status detection function (open)
7) HSOP-M28 package
Applications
Car navigation system backlights, small/medium-sized LCD panels, etc.
Absolute maximum ratings (Ta = 25 ͠)
Parameter
Symbol
Rating
Unit
Power supply voltage (Pin 1)
VCC 36
V
Load switch output voltage (Pin 2)
VLOADSW
36
V
LED output voltage (Pin 12,14,15,17)
VLED
36
V
FAIL output voltage (Pin 3,20)
VOL 7
V
Input voltage (Pin 5,6,10,11,24)
VIN -0.37 < VCC
V
VDAC input voltage (Pin 8)
Power Consumption
VDAC
Pd
-0.37 < VCC
2.20 ̪1
V
W
Junction temperature
Tjmax
150
͠
Operating temperature range
Topr -40+95
͠
Storage temperature range
LED maximum output current (Pin : 12,14,15,17)
Tstg
ILED
 -55+150
   150̪̪
͠
mA
̪1 IC mounted on glass epoxy board measuring 70mm×70mm×1.6mm, power dissipated at a rate of 17.6mw/͠ at temperatures above
25͠
̪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.
Operating conditions (Ta = 25 ͠)
Parameter
Symbol
Target value
Unit
Power supply voltage (Pin 1)
VCC 4.530
V
Oscillating frequency range
FOSC
50550
kHz
External synchronization frequency range (Pin 6) ̪̪ FSYNC
fosc550
kHz
External synchronization pulse duty range (Pin 6)
FSDUTY
4060
%
̪4 Connect SYNC to GND 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.
October. 2008
ROHM Co., Ltd.


Rohm Semiconductor Electronic Components Datasheet

BD8118FM Datasheet

White LED Driver IC

No Preview Available !

Electrical Characteristics (unless otherwise specified, VCC=12V Ta=25͠)
Parameter
Target value
Symbol
Min. Typ. Max.
Circuit current
ICC 2.5 6 10
Standby current
IST -
[VREG Block (VREG)]
Reference voltage
VREG 4.5
[SW Block (SWOUT,CS)]
SWOUT high-side ON resistance
RONH 0.05
SWOUT low-side ON resistance
RONL 0.05
Over-current
voltage
protection
operating
VDCS
0.3
[Error Amplifier (COMP,SS)]
LED control voltage
VLED
0.7
COMP sink current
ISKCP
40
COMP source current
ISCCP -200
SS charging current
ISS -14
SS maximum voltage
VMXSS 2.0
SS standby current
ISTSS
-
[Oscillator Block (RT, SWOUT)]
Oscillating frequency
FOSC 250
[OVP Block (OVP)]
Over-voltage detection reference voltage VDOVP 1.86
OVP hysteresis width
VDOHS 0.35
[UVLO Block (VREG)]
Reduced-voltage detection reference
VDUVLO 2.5
voltage
UVLO hysteresis width
VDUHS 50
[Load Switch Block (open-drain) (LOADSW)]
Load switch LOW voltage
VLDL 0.05
[LED Output Block (LED1-4, ISET, PWM, VDAC, OVP)]
LED current relative dispersion width
ٌILED1
0
LED current absolute dispersion width
ٌILED2 -6
ISET voltage
VISET 1.96
PWM light modulation
Duty 0.38
PWM frequency
FPWM
0
VDAC gain
GVDAC 20
0
5
3
2
0.4
0.8
100
-100
-10
2.5
0
300
2.0
0.45
2.8
100
0.15
3
0
2.0
-
-
25
2
5.5
7
5
0.5
0.9
200
-40
-6
3.0
2
350
2.14
0.55
3.1
200
0.3
6
6
2.04
99.5
20
30
Open detection voltage 1
VDOP1 0.05 0.15 0.3
Open detection voltage 2
VDOP2 1.56 1.7 1.84
[Logic Inputs (EN, SYNC, PWM, LEDEN1, LEDEN2)]
Input HIGH voltage
VINH
2.6
Input LOW voltage
VINL GND
Input current 1
IIN 18
Input current 2
IEN 13
[FAIL Output (open drain) (FAIL1, FAIL2)]
FAIL LOW voltage
VFLL 0.05
-
-
35
25
0.1
5.5
0.8
53
38
0.2
Unit
mA
μA
V
V
V
μA
μA
μA
V
μA
KHz
V
V
V
mV
V
%
%
V
%
KHz
mA/V
V
V
V
V
μA
μA
V
Conditions
EN=Hi, SYNC=VREG, RT=OPEN
PWM=OPEN, ISET=OPEN, CIN=1μF
EN=Low
IREG=-10mA, CREG=1μF
ION=-10mA
ION=10mA
VCS=sweep up
VLED=2V, Vcomp=1V
VLED=0V, Vcomp=1V
VSS1.0V
ENHigh
ENLow
RT=100k
VOVP=Sweep up
VOVP=Sweep down
VREG=Sweep down
VREG=Sweep up
ILOAD=10mA
ILED=50mA  ̪
ILED=50mA
FPWM=150Hz, ILED=50mA ̪
Duty=50%ILED=50mA ̪
VDAC=02V, ILED=50mA ̪
VLED= Sweep down, VOVPVDOP2,
VSS҈VMXSS
VOVP= Sweep up, VLEDVDOP1,
VSS҈VMXSS
VIN=5V(SYNC,PWM,LEDEN1,LEDEN2)
VEN=5V (EN)
IOL=1mA
 This product is not designed for use in radioactive environments.
̪1 (MAX(ILED)-MIN(ILED))/(AVE(ILED)x100
̪2 ILED=VISET÷RISET×3300, VDACVISET
̪3 ILED=VDAC÷RISET×3300
̪ 0%/100%-input capable
2/16


Part Number BD8118FM
Description White LED Driver IC
Maker ROHM
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