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Datasheet
4ch White LED Driver with Buck-Boost
(32 LED Maximum)
BD81A34MUV-M BD81A34EFV-M
General Description
BD81A34MUV-M/EFV-M is a white LED driver with the capability of
withstanding high input voltage (35V Max). This driver has 4ch
constant-current drivers integrated in 1-chip, where each channel
can draw up to 120mA (Max), which is also suitable for high
illumination LED drive. Furthermore, a buck-boost current mode
DC/DC controller is also integrated to achieve stable operation
during power voltage fluctuation. Light modulation (dimming
function) is possible by PWM input.
Key Specifications
Operating Input Voltage Range
Output LED Current Accuracy
DC/DC Oscillation Frequency
Operating Temperature Range
LED Maximum Output Current
4.5 to 35 V
±3.0%@50mA
200 to 2200kHz
-40 to +125
120mA/ch
Features
Integrated Buck-Boost current mode DC/DC controller
Integrated 4ch current driver for LED drive
PWM light modulation (Dimming)-supported
External switching frequency synchronization
Built-In protection function (UVLO, OVP, OCP, SCP)
LED abnormality detection function (Open/Short)
Integrated VOUT discharge function (Buck-Boost structure
limitation)
AEC-Q100 Qualified
Package(s) W(Typ) x D(Typ) x H(Max)
VQFN28SV5050
HTSSOP-B28
(BD81A34MUV-M)
(BD81A34EFV-M)
W×L×H
W×L×H
5.0 ×5.0 ×1.0
9.7 ×6.4 ×1.0
Application
Audio Display , Navi , CID , Cluster , HUD
Small and Medium type LCD Panels for Automotive use.
Application Circuit Diagram
CIN
Vin
(GND)
(GND)
CREG
(GND)
VCC
EN
VREG
VDISC
SYNC
RT
RRT
(GND)
COMP
RPC
CPC
(GND)
SS
CSS
(GND)
PWM
BD81A34MUV-M
ISET
RISET
(GND)
GND
(GND)
LEDEN1 LEDEN2
Product structure Silicon monolithic integrated circuit
This product has no designed protection against radioactive rays
OVP
FB
CS
FAIL1
BOOT
OUTH
SW
(DGND)
OUTL
DGND
(DGND)
LED1
LED2
LED3
LED4
PGND
(PGND)
FAIL2
COUT
(DGND)
(DGND) (DGND)
(DGND)
Figure 1. Buck-Boost Application Circuit
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BD81A34MUV-M BD81A34EFV-M
Datasheet
Pin Configuration
VQFN28SV5050 (Top view)
HTSSOP-B28 (Top view)
Figure 2. Pin Placement
Block Diagram
Pin Description
VQFN28
SV5050
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
-
VREG
HTSSOP
-B28
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
1
2
3
4
5
6
7
8
9
10
-
VDISC
Pin Name Function
LEDEN1
LEDEN2
LED1
LED2
LED3
LED4
OVP
FB
PGND
OUTL
DGND
VDISC
SW
OUTH
BOOT
VREG
EN
CS
VCC
SS
COMP
RT
SYNC
ISET
GND
PWM
FAIL1
FAIL2
Thermal
PAD
LED output pin enable terminal 1
LED output pin enable terminal 2
LED output terminal 1
LED output terminal 2
LED output terminal 3
LED output terminal 4
Over-voltage detection terminal
Pre-boost up voltage setting pin
LED output GND terminal
Low side FET gate terminal
DC/DC output GND terminal
Output voltage discharge terminal
High side FET source terminal
High side FET gate terminal
High side FET driver power supply
terminal
Internal constant voltage
Enable terminal
DC/DC current sense terminal
Input power supply terminal
“Soft Start” Capacitor connection
ERR AMP output
Oscillation Frequency-setting resistance
input
External synchronization input terminal
LED Output current setting pin
Small signal GND terminal
PWM light modulation input terminal
“Failure” signal output terminal
LED open/short detection output signal
Please connect to back surface heat
dissipation PAD GND.
VCC
EN
SYNC
RT
UVLO TSD
VREG
PWM
Timer
Latch
Control Logic
SLOPE
OSC
PWM
OVP
FB
OCP
DRV
CTL
VREG
COMP
SS
OCP OVP
SS
ERR AMP
---
PWM
Current driver
OVP
FB
CS
FAIL1
BOOT
OUTH
SW
OUTL
DGND
LED1
LED2
LED3
LED4
ISET
GND
ISET
Open Short Detect
Timer
Latch
Open Det
Short Det
LEDEN1 LEDEN2
PGND
Figure 3. Internal Block
FAIL2
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BD81A34MUV-M BD81A34EFV-M
Datasheet
Absolute Maximum Ratings (Ta=25°C)
Item
Code
Rating
Unit
Power Supply Voltage
BOOT, OUTH Pin Voltage
SW, CS Pin Voltage
BOOT-SW Pin Voltage
LED1 to 4, VDISC Pin Voltage
VREG, OVP, FAIL1, FAIL2,
LEDEN1, LEDEN2, ISET,
PWM, SS, COMP, RT, SYNC,
EN, FB,OUTL Pin Voltage
Power Dissipation (VQFN28SV5050)
Power Dissipation (HTSSOP-B28)
VCC
VBOOT, VOUTH
VSW, VCS
VBOOT-SW
VLED1,2,3,4, VVDISC
VVREG, VOVP, VFAIL1, VFAIL2, VLEDEN1,
VLEDEN2, VISET, VPWM, VSS,
VCOMP, VRT, VSYNC, VEN,
VFB, VOUTL
Pd(MUV)
Pd(EFV)
40
45
40
7
40
-0.3 to +7 < VCC
4.56 (Note 1)
4.70 (Note 2)
V
V
V
V
V
V
W
W
Operating Temp Range
Topr
-40 to +125
°C
Storage Temp Range
Tstg
-55 to +150
°C
LED Maximum Output Current
ILED
120 (Note 3)
mA
Junction Temperature
Tjmax
150 °C
(Note 1) Mounted on a 4-layer 70mm×70mm×1.6mm glass epoxy PCB and gold foil area 70mm×70mm. Decrease by 36.5mW/for Ta above 25.
(Note 2) Mounted on a 4-layer 70mm×70mm×1.6mm glass epoxy PCB and all layers heat radiation gold foil 5505mm2. Decrease by 37.6mW/for Ta above 25.
(Note 3) Current level/ch
Caution: Operating the IC over the absolute maximum ratings may damage the IC. In addition, it is impossible to predict all destructive situations such as short-circuit
modes, open circuit modes, etc. Therefore, it is important to consider circuit protection measures, like adding a fuse, in case the IC is operated in a special mode
exceeding the absolute maximum ratings
Recommended Operating Conditions (Ta=25°C)
Item
Code
Rating
Unit
Power Supply Voltage
DC/DC Oscillation Frequency Range
External Synchronization Frequency Range
(Note 3) (Note 4)
VCC
fosc
fSYNC
4.5 to 35
200 to 2200
fosc to 2200
V
kHz
kHz
External Synchronization Pulse Duty Range
FSDUTY
40 to 60
%
(Note3) If not using an external synchronization frequency, please make the SYNC open and/or connect to GND.
(Note4) If using an external synchronization frequency, please do not conduct the operation such as switching to internal oscillation frequency in the middle of the
process.
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BD81A34MUV-M BD81A34EFV-M
Datasheet
Electrical Characteristics (VCC=12V, Ta = Tj = -40°C to +125°C *Unless otherwise specified)
Parameters
Signal
Standard Value
MIN TYP MAX
Unit
Condition
Circuit current
EN=High, SYNC=High, RT=OPEN
ICC - - 10 mA PWM=Low,ISET=OPEN,CIN=10μF
standby current
[VREG Section]
IST - - 10 μA EN=Low, VDISC=OPEN
Voltage reference
VREG 4.5 5 5.5 V IREG=-5mA, CREG=2.2μF
[OUTH Section]
OUTH top side ON resistor
1.9 3.5 6.2 ION=-10mA, Ta=25
RONHH
1.5 3.5 7.0 ION=-10mA, Ta=-40°C to +125°C
1.0 2.5 5.0 ION=10mA, Ta=25
OUTH bottom side ON resistor
RONHL
0.8 2.5 5.5 ION=-10mA, Ta=-40°C to +125°C
OCP detection voltage
[OUTL Section]
OUTL top side ON resistor
VOLIMIT
VCC-0.66 VCC-0.6 VCC-0.54 V
1.9 3.5 6.5 ION=10mA, Ta=25
RONLH
1.5
3.5
10.0
ION=-10mA, Ta=-40°C to +125°C
OUTL bottom side ON resistor
[SW Section]
SW ON resistor
[Error Amp Section]
LED control voltage
RONLL
RON_SW
VLED
1.0 2.5 5.0 ION=10mA, Ta=25
0.8 2.5 5.5 ION=-10mA, Ta=-40°C to +125°C
5.0
10.0
15.0
ION=10mA, Ta=25
4.0
10.0
25.0
ION=-10mA, Ta=-40°C to +125°C
0.9 1.0 1.1 V
COMP sink current
ICOMPSINK
20
80
160 μA VLED=2V, VCOMP=1V
COMP source current
[Oscillation Section]
Oscillation frequency 1
ICOMPSOURCE
-160
fosc1
285
-80
300
-20 μA VLED=0V, VCOMP=1V
315 kHz RT=27k
Oscillation frequency 2
[OVP Section]
OVP detection voltage
fosc2
VOVP
1800
2000
2200
kHz RT=3.9k
1.9 2.0 2.1 V VOVP=Sweep up
OVP hysteresis width
VOVPHYS
0.45
0.55
0.65 V VOVP=Sweep down
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BD81A34MUV-M BD81A34EFV-M
Datasheet
(Unless otherwise specified, VCC=12V, Ta = Tj = -40 ~ 125 )
Parameters
Symbol
Standard Value
MIN TYP MAX
[FB Section]
FB detection voltage
VFB 0.9 1.0 1.1
Unit Condition
V VFB=Sweep up
FB hysteresis width
[UVLO Section]
UVLO detection voltage
VFBHYS
VUVLO
0.33
0.43
0.53
V VFB=Sweep down
3.2 3.5 3.8 V VCC : Sweep down
UVLO hysteresis width
[LED Output Section]
LED current relative deviation
width
VUHYS
ILED1
LED current absolute
deviation width
ILED2
ISET voltage
PWM dimmer MIN pulse width
VISET
TMin
250 500 750 mV VCC : Sweep up, VREG>3.5V
-3
-
+3
%
ILED=50mA, Ta=25
ILED1=(ILED/ILED_AVG-1)×100
-5
-
+5
%
ILED=50mA
ILED1=(ILED/ILED_AVG-1)×100
-3
-
+3
%
ILED=50mA, Ta=25
ILED2=(ILED/50mA-1)×100
-5
-
+5
%
ILED=50mA
ILED2=(ILED/50mA-1)×100
0.9 1.0 1.1 V RISET=100k
20 -
- μs FPWM=150Hz, ILED=100mA
PWM dimmer Max dim
DMax - - 100 % FPWM=150Hz, ILED=50mA
PWM dimmer frequency
[Protection Circuit Section]
FPWM
-
- 20 kHz Duty=2%, ILED=50mA
LED open detection voltage VOPEN 0.2 0.3 0.4 V VLED= Sweep down
LED short detection voltage
VSHORT
4.2
4.5
LED short detection
latch OFF delay time
TSHORT 70 100
PWM Latch OFF delay time
TPWM
70 100
SCP Latch OFF delay time
TSCP
70 100
[Logic Input Voltage] (EN, PWM, SYNC, LEDEN1 & LEDEN2)
Input High voltage
VINH 2.1 -
4.8 V VLED= Sweep up
130 ms RRT=27k
130 ms RRT=27k
130 ms RRT=27k
VREG
V
Input Low voltage
Input flow current
[FAIL Output (Open drain)]
FAIL Low voltage
VINL
IIN
VOL
- - 0.8 V
Apply at 5V
15 50 100 μA (EN,SYNC,PWM,LEDEN1,
LEDEN2)
- 0.1 0.2 V IOL=0.1 A
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