A4938EETTR-T

A4938EETTR-T Datasheet

A4938 3-Phase Brushless DC Motor Pre-Driver

Part	Datasheet
A4938EETTR-T	A4938EETTR-T (pdf)

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A4938 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 The A4938 is a complete 3-phase brushless DC BLDC motor pre-driver, supplying direct, high-current gate drive of an all N-channel power MOSFET 3-phase bridge. The device has three Hall-element inputs, a sequencer for commutation control, fixed off-time pulse width modulation PWM current control, and locked-rotor detection. Output current is scaled by the capability of the external MOSFETs. Locked rotor detection delay is set by an external capacitor on the CLD terminal. The ENABLE, DIR, and BRAKEZ inputs can be used to control motor speed, position, and torque. Motor speed can be determined using the FG1 output. The external MOSFETS can be PWMed using an external signal on the PWM input, or using the internal PWM current regulator. In either case, the A4938 synchronous rectification feature reduces power dissipation by turning on the appropriate MOSFETs during current decay. The Hall elements can be inexpensive types, when used with noise filtering to prevent false commutation signals. The A4938 provides a regulated V supply to power the three Hall elements. Internal circuit protection includes thermal Continued on the next CLD HBIAS CP1 CP2 VCP VBB System Control Logic A4938 GLB BRAKEZ ENABLE DIR GHC SC SENSE GND HA+ HB+ HC+ uF 2 kΩ VIN A4938-DS A4938 3-Phase Brushless DC Motor Pre-Driver Description continued shutdown with hysteresis, undervoltage lockout, and dead time The A4938 is supplied in a 5 mm x 5 mm, 28-terminal QFN package protection. Special power-up sequencing is not required. Operating with exposed thermal pad. This small footprint package is lead Pb temperature range is to 85°C. free with 100% matte tin leadframe plating. Selection Guide Part Number A4938EETTR-T Packing 1500 pieces per reel Package 5 mm x 5 mm, mm nominal height QFN Absolute Maximum Ratings Characteristics 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 E Notes Rating 38 to 7 to 7 to 85 150 to 150 Unit V ºC ºC ºC

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A4938 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

The A4938 is a complete 3-phase brushless DC BLDC motor pre-driver, supplying direct, high-current gate drive of an all N-channel power MOSFET 3-phase bridge. The device has three Hall-element inputs, a sequencer for commutation control, fixed off-time pulse width modulation PWM current control, and locked-rotor detection.

Output current is scaled by the capability of the external MOSFETs. Locked rotor detection delay is set by an external capacitor on the CLD terminal. The ENABLE, DIR, and BRAKEZ inputs can be used to control motor speed, position, and torque. Motor speed can be determined using the FG1 output.

The external MOSFETS can be PWMed using an external signal on the PWM input, or using the internal PWM current regulator. In either case, the A4938 synchronous rectification feature reduces power dissipation by turning on the appropriate MOSFETs during current decay.

The Hall elements can be inexpensive types, when used with noise filtering to prevent false commutation signals. The A4938 provides a regulated V supply to power the three Hall elements. Internal circuit protection includes thermal

Continued on the next

CLD HBIAS CP1 CP2 VCP VBB

System Control Logic

A4938

GLB BRAKEZ

ENABLE DIR

GHC SC

SENSE

GND HA+ HB+ HC+
uF 2 kΩ VIN

A4938-DS

A4938
3-Phase Brushless DC Motor Pre-Driver

Description continued
shutdown with hysteresis, undervoltage lockout, and dead time The A4938 is supplied in a 5 mm x 5 mm, 28-terminal QFN package
protection. Special power-up sequencing is not required. Operating with exposed thermal pad. This small footprint package is lead Pb
temperature range is to 85°C.
free with 100% matte tin leadframe plating.

Selection Guide

Part Number A4938EETTR-T

Packing 1500 pieces per reel

Package 5 mm x 5 mm, mm nominal height QFN

Absolute Maximum Ratings

Characteristics 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 E

Notes

Rating 38
to 7 to 7 to 85
150 to 150

Unit V ºC ºC ºC

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Datasheet ID: A4938EETTR-T 516039