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2011.07 - Rev.
© 2011 ROHM Co., Ltd. All rights reserved.
LED Drivers for LED Decoration
LED Driver
for Indicators and Signage
BD7844AEFV
●Description
BD7844AEFV is LED Display Driver. It can control 16ch Nch Open Drain output for LED drive. It can control the luminance of
the LEDs by the setting of the internal register, with 256 steps PWM control. It supports I
2
C interface. HTSSOP-B28 (with
Back-side metal for heat radiation) package.
●Features
1) 16ch × 80mA (Absolute Maximum Rating)
2) Conforming to I
2
C -bus I/F (1MHz Fast mode Plus)
3) Either of interactive or single direction can be selected with the I2CSEL pin. (2MHz clock frequency on single direction)
4) Independent setting of output brightness is possible by register setting for each channel. (PWM 256 steps)
5) Power supply voltage : 4.5 ～ 5.5V
6) Max voltage of Open-drain output terminals: 20.0V (Absolute Maximum Rating)
7) Built-in thermal shutdown (TSD）circuit
8) Built-in power-on reset circuit
9) Small package with back-side metal for heat radiation: HTSSOP-B28
●Absolute Maximum Ratings (Ta=25℃)
Parameter Symbol Ratings Unit
Power supply voltage VDDMAX1 -0.3 ～ 7.0 V
Operating voltage range VDDMAX2 4.5 ～ 5.5 V
Output terminal voltage VOUTMAX -0.3 ～ 20.0 V
Output terminal current IOUTMAX 80
*1
mA/ch
Logic input terminal voltage VINMAX -0.3 ～ VDD+0.3 ≦ 7.0 V
Permissible dissipation Pd 1.45
*2
W
Operating temperature range Topr -40 ～ 85 ℃
Storage temperature range Tstr -55 ～ 150 ℃
Junction temperature Tjmax 150 ℃
Please be careful that the anti-radiation design is not applied to this IC.
*1) Please take the IC’s power consumption & permissible dissipation into consideration before using it.
*2) Mounted on ROHM standard board (70mm×70mm×1.6mm (thickness), glass-epoxy board).
Ta= 2 5℃ or more, it is reduced with 11.6ｍW/℃.
●Operating conditions (Ta=-40~85℃)
Parameter Symbol Ratings Unit Conditions
Power supply voltage VDD
4.5 ～ 5.5 V
High level input voltage VIH VDDx0.7 ～ VDD V
SDA,SCL,RESETB,
I2CSEL,A0,A1,A2,A3
Low level input voltage VIL 0 ～ VDDx0.3 V
Low level output current IOL ～ 30 mA SDA
No.11107EAT01
