A4931MET-T

A4931MET-T Datasheet

A4931 3-Phase Brushless DC Motor Pre-Driver

Part	Datasheet
A4931MET-T	A4931MET-T (pdf)

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A4931 3-Phase Brushless DC Motor Pre-Driver Drives 6 N-channel MOSFETs Synchronous rectification for low power dissipation Internal UVLO and thermal shutdown circuitry Hall element inputs PWM current limiting Dead time protection FG outputs Standby mode Lock detect protection Overvoltage protection Package 28-contact QFN ET package Approximate Scale 1:1 TheA4931 is a complete 3-phase brushless DC motor pre-driver. The device is capable of driving a wide range of N-channel power MOSFETs and can support motor supply voltages up to 30 V. Commutation logic is determined by three Hall-element inputs spaced at Other features include fixed off-time pulse width modulation PWM current control for limiting inrush current, locked-rotor protection with adjustable delay, thermal shutdown, overvoltage monitor, and synchronous rectification. Internal synchronous rectification reduces power dissipation by turning on the appropriate MOSFETs during current decay, thus shorting the body diode with the low RDS on MOSFET. Overvoltage protection disables synchronous rectification when the motor pumps the supply voltage beyond the overvoltage threshold during current recirculation. The A4931 offers enable, direction, and brake inputs that can control current using either phase or enable chopping. Logic outputs FG1 and FG2 can be used to accurately measure motor rotation. Output signals toggle state during Hall transitions, providing an accurate speed output to a microcontroller or speed control circuit. Operating temperature range is to 105°C. The A4931 is supplied in a 5 mm x 5 mm, 28-terminal QFN package with exposed thermal pad. This small footprint package is lead Pb free with 100% matte tin leadframe plating. System Control Logic CLD HBIAS CP1 CP2 VCP VBB A4931 BRAKEZ GLB ENABLE SENSE GND HA+ HB+ HC+ uF 2 kΩ VIN A4931 3-Phase Brushless DC Motor Pre-Driver Selection Guide Part Number A4931METTR-T Packing 1500 pieces per reel Package 5 mm x 5 mm, mm nominal height QFN Absolute Maximum Ratings Characteristic Load Supply Voltage Motor Phase Output Hall Input Logic Input Voltage Range Operating Ambient Temperature Maximum Junction Temperature Storage Temperature Symbol VBB SX VHx VIN TA TJ max Tstg tw < 500 ns DC Range M Notes Rating 38 to 7 to 7 to 105 150 to 150 Units V ºC ºC ºC Thermal Characteristics Characteristic Package Thermal Resistance, Junction to Ambient Package Thermal Resistance, Junction to Exposed Pad For additional information, refer to the Allegro website. Test Conditions 4-layer PCB based on JEDEC standard Rating 32 2 Units ºC/W ºC/W

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A4931 3-Phase Brushless DC Motor Pre-Driver

Drives 6 N-channel MOSFETs Synchronous rectification for low power dissipation Internal UVLO and thermal shutdown circuitry Hall element inputs PWM current limiting Dead time protection FG outputs Standby mode Lock detect protection Overvoltage protection

Package 28-contact QFN ET package

Approximate Scale 1:1

TheA4931 is a complete 3-phase brushless DC motor pre-driver. The device is capable of driving a wide range of N-channel power MOSFETs and can support motor supply voltages up to 30 V. Commutation logic is determined by three Hall-element inputs spaced at

Other features include fixed off-time pulse width modulation PWM current control for limiting inrush current, locked-rotor protection with adjustable delay, thermal shutdown, overvoltage monitor, and synchronous rectification. Internal synchronous rectification reduces power dissipation by turning on the appropriate MOSFETs during current decay, thus shorting the body diode with the low RDS on MOSFET. Overvoltage protection disables synchronous rectification when the motor pumps the supply voltage beyond the overvoltage threshold during current recirculation.

The A4931 offers enable, direction, and brake inputs that can control current using either phase or enable chopping. Logic outputs FG1 and FG2 can be used to accurately measure motor rotation. Output signals toggle state during Hall transitions, providing an accurate speed output to a microcontroller or speed control circuit.

Operating temperature range is to 105°C. The A4931 is supplied in a 5 mm x 5 mm, 28-terminal QFN package with exposed thermal pad. This small footprint package is lead Pb free with 100% matte tin leadframe plating.

System Control Logic

CLD HBIAS CP1 CP2 VCP VBB

A4931

BRAKEZ

GLB ENABLE

SENSE

GND HA+ HB+ HC+
uF 2 kΩ VIN

A4931
3-Phase Brushless DC Motor Pre-Driver

Selection Guide

Part Number A4931METTR-T

Packing 1500 pieces per reel

Package 5 mm x 5 mm, mm nominal height QFN

Absolute Maximum Ratings

Characteristic Load Supply Voltage Motor Phase Output Hall Input Logic Input Voltage Range Operating Ambient Temperature Maximum Junction Temperature Storage Temperature

Symbol VBB SX VHx VIN TA

TJ max Tstg
tw < 500 ns DC

Range M

Notes

Rating 38
to 7 to 7 to 105
150 to 150

Units V ºC ºC ºC

Thermal Characteristics

Characteristic

Package Thermal Resistance, Junction to Ambient

Package Thermal Resistance, Junction to Exposed Pad
*For additional information, refer to the Allegro website.

Test Conditions* 4-layer PCB based on JEDEC standard

Rating 32 2

Units ºC/W ºC/W

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Datasheet ID: A4931MET-T 516038