Datasheet
4-Channel Back-Boost
White LED Driver
with Integrated FET for up to 32 LEDs
BD81A04EFV-M
●General
Description
BD81A04EFV-M is a white LED driver with the capability
of withstanding high input voltage
(40V MAX).This driver has 4ch constant-current drivers
integrated in 1-chip, which each channel can draw up to
120mA 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 unstable car-battery voltage input and also to
remove the constraint of the number of LEDs in series
connection. The brightness can be controlled by PWM
techniques. The set board can be made a conserve area
because MOSFET is built into
●Features
■
Integrated buck-boost current-mode DC/DC controller
■
Four integrated LED current driver channels (120 mA
max. each channel)
■
PWM Light Modulation
■
Built-in protection functions (UVLO, OVP, TSD, OCP,
SCP)
■
Abnormal status detection function (OPEN/ SHORT)
●Key
Specifications
■
Power supply voltage
■
LED output current accuracy
■
Oscillation frequency
■
Operating temperature range
■
PWM minimum pulse width
■
LED maximum output current
●Packages
HTSSOP-B28
4.5 to 35 [V]
±3.0 % @50mA
200 to 2200 KHz
-40 to 85
℃
1usec
120½A／ch
6.5
㎜×6.4 ㎜×1.0 ㎜
●Applications
For display audio, Small and medium-sized type
LCD panel
●Typical
Application Circuits
CIN
(GND)
COUT
VREG
VDISC
OVP
(DGND)
Vin
(GND)
(GND)
VCC
CS
(DGND)
EN
BOOT
OUTH
SW
SYNC
(DGND)
RT
RRT
(GND)
OUTL
DGND
BD81A04EFV/MUV
(DGND)
COMP
RPC
LED1
CPC
(GND)
SS
LED2
CSS
(GND)
LED3
PWM
LED4
PGND
ISET
FAIL1
RISET
(GND)
(PGND)
FAIL2
GND
SHDETEN
(GND)
LEDEN1
LEDEN2
○Product
structure：Silicon monolithic integrated circuit
○This
product is not designed protection against radioactive rays.
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BD81A04EFV-M
●Pin
Configuration
●Pin
Description
HTSSOP
-B28
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
VQFN028
V5050
19
20
21
22
23
24
25
26
27
28
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Symbol
VCC
SS
COMP
RT
SYNC
SHDETEN
GND
PWM
FAIL1
FAIL2
LEDEN1
LEDEN2
LED1
LED2
LED3
LED4
OVP
ISET
PGND
OUTL
DGND
VDISC
SW
OUTH
BOOT
VREG
EN
CS
Function
Datasheet
Input power supply
Soft start time-setting capacitance input
Error amplifier output
Oscillation frequency-setting resistance input
External synchronization signal input
LED short detection enable signal
Small-signal GND
PWM light modulation input
Failure signal output
LED open/short detection signal output
LED output enable input 1
LED output enable input 2
LED output 1
LED output 2
LED output 3
LED output 4
Over voltage detection input
LED output current-setting resistance input
LED output GND
Low-side internal MOSFET Drain output
DCDC output GND
VOUT discharge signal
High-side external MOSFET Source pin
High-side external MOSFET Gate output
High-side external MOSFET power supply pin
Internal reference voltage output
Enable input
DC/DC current sence pin
●Block
Diagram
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BD81A04EFV-M
●
Absolute maximum ratings
(Ta=25℃)
Parameter
Power supply voltage
BOOT ,OUTH Voltage
SW,CS,OUTL Voltage
BOOT-SW Voltage
LED output, VDISC voltage
VREG, OVP, FAIL1, FAIL2,
LEDEN1, LEDEN2
ISET, VDAC, PWM, SS, COMP, RT,
SYNC, EN, SHDETEN Voltage
Power Consumption
Operating temperature range
Storage temperature range
LED maximum output current
Junction temperature
※1
※2
Datasheet
Symbol
VCC
VBOOT, VOUTH
VSW, VCS, VOUTL
VBOOT-SW
VLED1,2,3,4, VDISC
VVREG, VOVP, VFAIL1, VFAIL2,
VLEDEN1, VLEDEN2, VISET, VPWM,
VSS, VCOMP, VRT, VSYNC, VEN,
VSHDETEN
Pd
Topr
Tstg
ILED
Tjmax
Rating
40
45
40
7
40
Unit
V
V
V
V
V
-0.3½7 < VCC
1
V
1.45
※
-40½+85
-55½+150
2 3
120
※ ※
150
W
℃
℃
mA
℃
IC mounted on glass epoxy board measuring 70mm×70mm×1.6mm, power dissipated at a rate of 11.6mw/℃ at temperatures above 25℃.
Dispersion figures for LED maximum output current and V
F
are correlated. Please refer to data on separate sheet.
※3
Amount of current per channel.
●
Operating conditions
(Ta=25℃)
Parameter
Power supply voltage
Oscillating frequency range
External synchronization frequency range
External synchronization pulse duty range
※
4
※
5
Symbol
VCC
F
OSC
F
SYNC
F
SDUTY
Limits
4.5½35
200½2200
fosc½2200
40½60
Unit
V
KHz
KHz
%
※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.
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TSZ02201-0G1G0C600010-1-2
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BD81A04EFV-M
●Electrical
Characteristics
(unless otherwise specified, VCC=12V Ta=25℃)
Limits
Parameter
Symbol
Min
Typ
Max.
Circuit current
Standby current
[VREG Block (VREG)]
Reference voltage
[OUTH Block
OUTHhigh-side ON resistance
OUTH low-side ON resistance
OCP voltage
[OUTL Block]
OUTL ON resistance
[SW Block]
SW ON resistance
[Error Amplifie Block]
LED control voltage
COMP sink current
COMP source current
[Oscillator Block]
Oscillating frequency1
Oscillating frequency2
[OVP Block]
OVP voltage
OVP hysteresis width
SCP Latch OFF Delay Time
[UVLO Block ]
UVLO voltage
UVLO hysteresis width
[LED Output Block]
LEDcurrentrelativedispersionwidth
LEDcurrentabsolutedispersionwidth
ISET voltage
PWM minimum pulse width
PWM maximum duty
PWM frequency
Open detection voltage
LED Short detection voltage
LED Short Latch OFF Delay Time
PWM Latch OFF Delay Time
Input HIGH voltage
Input LOW voltage
Input current
[FAIL Output (open drain) ]
FAIL LOW voltage
VOL
-
0.1
0.2
V
IOL=0.1½A
△ILED1
△ILED2
VISET
Tmin
Dmax
FPWM
VOPEN
VSHORT
TSHORT
TPWM
VINH
VINL
IIN
-3
-3
0.9
1
-
-
0.2
4.2
70
70
2.1
GND
25
-
-
1.0
-
-
-
0.3
4.5
100
100
-
-
50
+3
+3
1.1
-
100
20
0.4
4.8
130
130
5.5
0.8
100
%
%
V
s
%
KHz
V
V
ms
ms
V
V
A
VUVLO
VUHYS
3.2
250
3.5
500
3.8
750
V
mV
VCC : Sweep down
VOVP
VOHYS
TSCP
1.9
0.45
70
2.0
0.55
100
2.1
0.65
130
V
V
ms
VOVP=Sweep up
VOVP=Sweep down
RT=27K
FOSC1
FOSC2
285
1800
300
2000
315
2200
KHz
KHz
RT=27K
RT=3.9K
VLED
ICOMP
SINK
ICOMP
SOURCE
Datasheet
Unit
mA
A
V
Conditions
EN=Hi, SYNC=Hi, RT=OPEN
PWM=Low,ISET=OPEN,CIN=10 F
EN=Low
IREG=-5mA, CREG=2.2 F
ION=-10mA
ION=10mA
ICC
IST
VREG
RONHH
RONHL
VOLIMIT
RONL
RON_SW
-
-
4.5
1.5
1.0
VCC-0.66
0.44
5.0
0.9
20
-160
-
-
5
3.5
2.5
VCC-0.6
0.8
10.0
1.0
80
-80
10
10
5.5
7.0
5.0
VCC-0.54
1.15
15.0
1.1
160
-20
V
ION=10mA
ION_SW=10mA
V
A
A
VLED=2V, Vcomp=1V
VLED=0V, Vcomp=1V
VCC : Sweep up,VREG>3.5V
ILED=50mA,
∆ILED1=(ILED/ILED_AVG-1)×100
ILED=50mA,
∆ILED2=(ILED/50mA-1)×100
RISET=100K
FPWM=150Hz, ILED=100mA
FPWM=150Hz, ILED=50mA
Duty=2%, ILED=50mA
VLED= Sweep down
VLED= Sweep up
RT=27K
RT=27K
[Logic Inputs (EN, SYNC, SHDETEN, PWM, LEDEN1, LEDEN2)]
VIN=5V(EN,SYNC,PWM,
SHDETEN, LEDEN1, LEDEN2)
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TSZ02201-0G1G0C600010-1-2
16.APR.2012 Rev.002
BD81A04EFV-M
●
Reference data
(unless otherwise specified, Ta=25℃)
Datasheet
8
VCC=SWEEP
EN=4V
PWM=0V
Ta=25
℃
5.5
VCC=12V,35V
Output Voltage
：
VREG[V]
5.0
Output Current
：
ICC [mA]
6
4
4.5
VCC=4.5V
4.0
2
0
0
10
20
30
Supply Voltage
：VCC[V]
40
3.5
-60
-20
20
60
100
Tempurature
：
Ta[
℃
]
Fig.2 VREG temperature characteristic
Fig.1 Circuit Current
(Switching OFF)
400
3000
Swiching frequency
：
fosc[KHz]
Swiching frequency
：
fosc[KHz]
350
VCC=12V
EN=4V
RT=27K
Ω
2500
VCC=12V
EN=4V
RT=3.9K
Ω
300
2000
250
1500
200
-60
-20
20
60
Temperature
：
Ta[℃]
100
1000
-60
-20
20
60
100
Temperature
：
Ta[℃]
Fig.3 OSC temperature characteristic
(@300KHz)
Fig.4 OSC temperature characteristic
(@2000KHz)
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TSZ02201-0G1G0C600010-1-2
16.APR.2012 Rev.002
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