Datasheet
4ch White LED Driver with Buck-Boost
(40 LED Maximum)
BD81A44MUV-M / BD81A44EFV-M
General Description
Key Specifications
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 (5000:1 dimming
function) is possible by PWM input.
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Operating Input Voltage Range
Output LED Current Accuracy
DC/DC Oscillation Frequency 200 to 2200kHz
Operating Temperature Range
LED Maximum Output Current
PWM min pulse width
4.5 to 35 V
±3.0%@50mA
-40 to +125℃
120mA/ch
1.0us
Package(s) W(Typ) x D(Typ) x H(Max)
Features
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Integrated Buck-Boost current mode DC/DC controller
Integrated 4ch current driver for LED drive
5000:1 PWM dimming @200Hz
VQFN28SV5050
(BD81A44MUV-M)
HTSSOP-B28
(BD81A44EFV-M)
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)
W(Typ) × D(Typ) × H(Max) W(Typ) × D(Typ) × H(Max)
5.0mm × 5.0mm ×1.0mm
9.7mm × 6.4mm × 1.0mm
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AEC-Q100 Qualified (Note 1)
(Note 1) Grade1
Application
For Display audio, CID, Cluster, HUD
Small and Medium type LCD Panels for Automotive use.
Typical Application Circuit
VCC CIN
CREG
COUT
VREG
VDISC
OVP
VCC
EN
CS
BOOT
OUTH
SW
SYNC
RT
OUTL
RRT
DGND
COMP
SS
RPC
CPC
BD81A44MUV-M /
BD81A44EFV-M
LED1
LED2
LED3
LED4
CSS
PWM
ISET
PGND
RISET
VREG
FAIL1
GND
FAIL2
SHDETEN
LEDEN1
LEDEN2
Figure 1. Buck-Boost Application Circuit
○Product structure:Silicon monolithic integrated circuit
○This product has no designed protection against radioactive rays
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© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
TSZ02201-0T3T0C600060-1-2
2016.10.19 Rev.003
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