Genenal Description

OB6619 is an application-specific 3-phases BLDC controller system on chip (SOC). The IC is optimized for low cost, high-efficiency drive circuits in applications needs.

It’s easy to built BLDC control circuit with current loop and speed loop by simple components.

OB6619 includes 51-compatible MCU,three phases level shift drivers, 5V_LDO and motor driving current protection comparator.



·         Power Tools, Garden Tools

·         General purpose 3 phases BLDC controller


Embedded MCU

·         MCS 51 Compatible

·         High speed architecture of 1 clock machine cycle runs up to 24MHz

·         Wide operation voltage: 1.8V to 5.5V

·         Main flash ROM 16KB. 256+512 bytes SRAM

·         12bit, 1MHz sampling rate  ADC

·         1 analog OpAmp

·         2 analog Comparators : 1 for BEMF detecting, 1 for current protection

·         6 channels 14bit PWM

·         1 cycle MDU: 16bit*16bit, 16bit shift

·         1 UART, 1 IIC

·         Three 16bit Timer/Counters

·         4channel CCU

·         Programmable watchdog timer


Three phases bridge driver

·         Integrated 70V three phases bootstrap driver.

·         Driver current : -0.5A/1.1A

·         Low side supply under-voltage lockout(UVLO), and over voltage protection(OVP)

·         High side floating supply under-voltage lockout(UVLO)

·         Build in dead-time

·         Build in cross conduction protection logic



·         4.6V to 17V supply voltage range

·         Output 5V±2%,max 100mA

·         Internal thermal overload protection

·         Internal current limiting protect when output short


Internal OSC

·         HIRC: 24MHz (±1%, 25°C)

·         LIRC: 20KHz (±30%, 25°C)


Typical Application

Sensor-less BLDC Control System