BD81A34MUV-M Datasheet, PDF (1/36 Pages) Rohm – 4ch White LED Driver with Buck-Boost (32 LED Maximum)

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
˙ç Operating Input Voltage Range
˙ç Output LED Current Accuracy
˙ç DC/DC Oscillation Frequency
˙ç Operating Temperature Range
˙ç LED Maximum Output Current
4.5 to 35 V
±3.0%@50mA
200 to 2200kHz
-40 to +125ˆ
120mA/ch
Features
˙ç Integrated Buck-Boost current mode DC/DC controller
˙ç Integrated 4ch current driver for LED drive
˙ç PWM light modulation (Dimming)-supported
˙ç External switching frequency synchronization
˙ç Built-In protection function (UVLO, OVP, OCP, SCP)
˙ç LED abnormality detection function (Open/Short)
˙ç Integrated V_OUT discharge function (Buck-Boost structure
limitation)
˙ç 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 ᶱ×5.0 ᶱ×1.0 ᶱ
9.7 ᶱ×6.4 ᶱ×1.0 ᶱ
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 structureɿSilicon monolithic integrated circuitç
˓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
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
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TSZ02201-0G3G0C600020-1-2
16.Jan.2014 Rev.002