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Rohm Semiconductor Electronic Components Datasheet

BD81A44MUV-M Datasheet

4ch White LED Driver

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Datasheet
4ch White LED Driver with Buck-Boost
(40 LED Maximum)
BD81A44MUV-M / BD81A44EFV-M
General Description
BD81A44MUV-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 (10,000:1
@100Hz dimming function) is possible by PWM input.
Key Specifications
Operating Input Voltage Range
4.5 to 35 V
Output LED Current Accuracy ±3.0%@50mA
DC/DC Oscillation Frequency 200 to 2200kHz
Operating Temperature Range -40 to +125
LED Maximum Output Current
120mA/ch
PWM min pulse width
1.0us
Features
Integrated Buck-Boost current mode DC/DC controller
Integrated 4ch current driver for LED drive
10,000:1 PWM dimming @100Hz
External switching frequency synchronization
Built-In protection function (UVLO, OVP, OCP, SCP)
LED abnormality detection function (Open/Short)
Integrated VOUT discharge function (Buck-Boost or Buck
structure limitation)
AEC-Q100 Qualified (Note 1)
(Note 1) Grade1
Package(s) W(Typ) x D(Typ) x H(Max)
VQFN28SV5050
(BD81A44MUV-M)
HTSSOP-B28
(BD81A44EFV-M)
W(Typ) × D(Typ) × H(Max) W(Typ) × D(Typ) × H(Max)
5.0mm × 5.0mm ×1.0mm 9.7mm × 6.4mm × 1.0mm
Application
For Display audio, CID, Cluster, HUD
Small and Medium type LCD Panels for Automotive use.
Typical Application Circuit
VCC CIN
VCC
CREG
VREG
EN
VDISC
SYNC
RT
RRT
COMP
RPC
CPC
SS
CSS
BD81A44MUV-M /
BD81A44EFV-M
PWM
ISET
RISET
GND
OVP
CS
BOOT
OUTH
SW
OUTL
DGND
LED1
LED2
LED3
LED4
PGND
FAIL1
FAIL2
SHDETEN
LEDEN1
LEDEN2
Figure 1. Buck-Boost Application Circuit
Product structureSilicon monolithic integrated circuit
This product has no designed protection against radioactive rays
COUT
VREG
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
1/35
TSZ02201-0T3T0C600060-1-2
22.Dec.2017 Rev.004


Rohm Semiconductor Electronic Components Datasheet

BD81A44MUV-M Datasheet

4ch White LED Driver

No Preview Available !

BD81A44MUV-M/EFV-M
Pin Description
VQFN28SV5050 (Top view)
LEDEN1
LEDEN2
LED1
LED2
LED3
LED4
OVP
1
2
3
4
5
6
7
28 27 26 25 24 23 22
Thermal PAD
8 9 10 11 12 13 14
21 COMP
20 SS
19 VCC
18 CS
17 EN
16 VREG
15 BOOT
HTSSOP-B28 (Top view)
VCC
SS
COMP
RT
SYNC
SHDETEN
GND
PWM
FAIL1
FAIL2
LEDEN1
LEDEN2
LED1
LED2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Thermal PAD
28 CS
27 EN
26 VREG
25 BOOT
24 OUTH
23 SW
22 VDISC
21 DGND
20 OUTL
19 PGND
18 ISET
17 OVP
16 LED4
15 LED3
Figure 2. Pin Configuration
Pin Configuration
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
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
--
Terminal
Name
LEDEN1
LEDEN2
LED1
LED2
LED3
LED4
OVP
ISET
PGND
OUTL
DGND
VDISC
SW
OUTH
BOOT
VREG
EN
CS
VCC
SS
COMP
RT
SYNC
SHDETEN
GND
PWM
FAIL1
FAIL2
Thermal
PAD
Function
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
LED output current setting terminal
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 resistor input
External synchronization input terminal
Short detection enable signal
Small signal GND terminal
PWM light modulation input terminal
“Failure” signal output terminal
LED open/short detection output signal
Back side thermal PAD
(Please connect to GND)
Block Diagram
VCC
EN
VREG
UVLO TSD
VREG
PWM
VDISC
OVP
OVP10
OCP
Timer
Latch
SYNC
RT
Control Logic
SLOPE
OSC
PWM
DRV
CTL
VREG
COMP
SS
OCP OVP
SS
PWM
ERR AMP
--
-+-
Current driver
ISET
GND
ISET
Open Short Detect
Timer
Latch
Open Det
Short Det
SHDETEN LEDEN1 LEDEN2
OVP
CS
FAIL1
BOOT
OUTH
SW
OUTL
DGND
LED1
LED2
LED3
LED4
PGND
FAIL2
Figure 3. Internal Block Diagram
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
2/35
TSZ02201-0T3T0C600060-1-2
22.Dec.2017 Rev.004


Part Number BD81A44MUV-M
Description 4ch White LED Driver
Maker ROHM
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