Low Duty LCD Segment Driver for Automotive application - BU91520KV-M (New)

BU91520KV-M is a 1/4 or 1/3duty general-purpose LCD driver that can be used for automotive applications and can drive up to 276 LCD Segments. This product can support VA LCD displays, which has better optical performance with higher LCD voltage driving and higher frame frequency driving. It can support operating temperature of up to +105℃ and can control up to 6 general-purpose outputs / PWM output ports for LED backlighting and LED button illumination realizing less flicker by various frequency setting function. It can also support a key scan function that detects a maximum of 30 keys inputs to reduce PCB wiring and to minimize microcontroller size and cost. It can support TTL compatible input interface is also available, these are well-suited for wide-voltage range of MCUs.

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Part number
Unit Quantity
Minimum Package Quantity
Packing Type
Constitution Materials List
BU91520KV-ME2 Active VQFP80 1000 1000 Taping inquiry Yes
Grade Automotive
Segment Element 276
Duty 1/4, 1/3
Bias 1/3, 1/2
Elements of MUX 1:3 207
Elements of MUX 1:4 276
Interface [line serial] 3wire+KEYOUT
Interface Voltage (Min.)[V] 2.7
Interface Voltage (Max.)[V] 6.0
Max GPO [port] 6
Max KEYSCAN [Key] 30
TTL input Support Yes
LCD Driving Waveform Line/Frame
Operating Temperature (Min.)[°C] -40
Operating Temperature (Max.)[°C] 105
    • 1/4 or 1/3duty setting selectable
      1/4duty driving: Max 276 segments
      1/3duty driving: Max 207 segments
    • 1/3 or 1/2 bias setting selectable
    • Support wide range of operation voltage from 2.7V to 6.0V, which can support TN LCD and VA LCD display.
    • Integrated LCD voltage driving circuit
    • Integrated oscillation circuit for LCD frame frequency
    • Line or Frame inversion driving selectable
    • Integrated 6ch general purpose outputs/ PWM outputs (SEG selectable)
    • Support 256 step PWM function to realize backlight/ button LED illumination
    • Support LCD frame frequency from 49Hz to 195Hz, total 8setting
    • Support PWM frequency from 146Hz to 2.34KHz, total 16setting
    • Support 3 wire serial interface + KEYOUT
    • Support TTL level input to connect 3.3V MCU directly
    • Support Max 30 key input detection (SEG selectable)
    • Integrated voltage detected type power on reset circuit
    • No external components required
    • Low power consumption design
    • Support up to +105℃ operation, qualified AEC-Q100 Grade2
ROHM Semiconductor reserves the right to change the specifications at any time.
Technical Data
Application Note

Thermal Resistance