A3992SB-T

A3992SB-T Datasheet

A3992 DMOS Dual Full-Bridge Microstepping PWM Motor Driver

Part	Datasheet
A3992SB-T	A3992SB-T (pdf)

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A3992 DMOS Dual Full-Bridge Microstepping PWM Motor Driver A, 50 V continuous output rating Low RDS on DMOS output drivers Short-to-ground protection Shorted load protection Optimized microstepping via six bit linear DACs Programmable mixed, fast, and slow current decay modes 4 MHz internal oscillator for digital timing Serial interface controls chip functions Synchronous rectification for low power dissipation Internal UVLO and thermal shutdown circuitry Crossover-current protection Inputs compatible with 5 or V control signals Sleep and Idle modes Packages 24 pin batwing DIP B and 24 pin TSSOP with exposed thermal pad LP LP package approximate scale Designed for pulse width modulated PWM current control of bipolar microstepped stepper motors, the A3992 is capable of continuous output currents to A and operating voltages to 50 V. Internal fixed off-time PWM current control timing circuitry can be programmed via the serial interface to operate in slow, fast, or mixed decay modes. The desired load current level is set via the serial port with two six bit linear DACs in conjunction with a reference voltage. The six bits of control allow maximum flexibility in torque control for a variety of step methods, from microstepping to full step drive. Load current is set in increments of the maximum value. Synchronous rectification circuitry allows the load current to flow through the low RDS on of the DMOS output driver during current decay. This feature eliminates the need for external clamp diodes in most applications, saving cost and external component count, while minimizing power dissipation. Internal circuit protection includes short-to-ground, shorted load, thermal shutdown with hysteresis, and crossover current protection. Special power up sequencing is not required. The A3992 is supplied in a thin profile mm maximum height 24 pin TSSOP suffix LP with exposed thermal pad and a 24 pin plastic DIP with dual copper batwing tabs suffix B . The exposed thermal pad on the LP is at ground potential and needs no electrical isolation. Both packages are lead Pb free with 100% matte tin leadframe plating. Microcontroller or Controller Logic 10 uF 5 kΩ uF VREG VDD ROSC CLOCK A3992 DATA STROBE REF SLEEP VBB1 VBB2 OUT1A OUT1B SENSE1 OUT2A OUT2B SENSE2 uF 100 uF A3992 Selection Guide Part Number A3992SB-T A3992SLPTR-T DMOS Dual Full-Bridge Microstepping PWM Motor Driver Packing 15 pieces/tube Tape, 4000 pieces/reel Package 24 pin batwing DIP 24 pin TSSOP with exposed thermal pad Absolute Maximum Ratings Characteristic Load Supply Voltage Output Current Logic Supply Voltage Logic Input Voltage Range VBBx to OUTx Voltage OUTx to SENSEx Voltage REF Reference Voltage SENSE Voltage DC Operating Ambient Temperature Maximum Junction Temperature Storage Temperature Symbol VBB IOUT VDD VIN VREF VSENSE TA TJ max Tstg Notes Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the current rating or a junction temperature of 150°C. Range S

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A3992 DMOS Dual Full-Bridge Microstepping PWM Motor Driver

A, 50 V continuous output rating Low RDS on DMOS output drivers Short-to-ground protection Shorted load protection Optimized microstepping via six bit linear DACs Programmable mixed, fast, and slow current decay modes 4 MHz internal oscillator for digital timing Serial interface controls chip functions Synchronous rectification for low power dissipation Internal UVLO and thermal shutdown circuitry Crossover-current protection Inputs compatible with 5 or V control signals Sleep and Idle modes

Packages
24 pin batwing DIP B and 24 pin TSSOP with exposed thermal pad LP

LP package approximate scale

Designed for pulse width modulated PWM current control of bipolar microstepped stepper motors, the A3992 is capable of continuous output currents to A and operating voltages to 50 V. Internal fixed off-time PWM current control timing circuitry can be programmed via the serial interface to operate in slow, fast, or mixed decay modes.

The desired load current level is set via the serial port with two six bit linear DACs in conjunction with a reference voltage. The six bits of control allow maximum flexibility in torque control for a variety of step methods, from microstepping to full step drive. Load current is set in increments of the maximum value.

Synchronous rectification circuitry allows the load current to flow through the low RDS on of the DMOS output driver during current decay. This feature eliminates the need for external clamp diodes in most applications, saving cost and external component count, while minimizing power dissipation.

Internal circuit protection includes short-to-ground, shorted load, thermal shutdown with hysteresis, and crossover current protection. Special power up sequencing is not required.

The A3992 is supplied in a thin profile mm maximum height 24 pin TSSOP suffix LP with exposed thermal pad and a 24 pin plastic DIP with dual copper batwing tabs suffix B . The exposed thermal pad on the LP is at ground potential and needs no electrical isolation. Both packages are lead Pb free with 100% matte tin leadframe plating.

Microcontroller or Controller Logic
10 uF
5 kΩ
uF VREG VDD

ROSC CLOCK

A3992

DATA

STROBE REF

SLEEP

VBB1 VBB2 OUT1A OUT1B SENSE1

OUT2A OUT2B SENSE2
uF 100 uF

A3992

Selection Guide Part Number

A3992SB-T A3992SLPTR-T

DMOS Dual Full-Bridge Microstepping PWM Motor Driver

Packing 15 pieces/tube

Tape, 4000 pieces/reel

Package 24 pin batwing DIP 24 pin TSSOP with exposed thermal pad

Absolute Maximum Ratings

Characteristic Load Supply Voltage

Output Current

Logic Supply Voltage Logic Input Voltage Range VBBx to OUTx Voltage OUTx to SENSEx Voltage REF Reference Voltage SENSE Voltage DC Operating Ambient Temperature Maximum Junction Temperature Storage Temperature

Symbol VBB

IOUT

VDD VIN

VREF VSENSE

TA TJ max

Tstg

Notes Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the current rating or a junction temperature of 150°C.

Range S

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Datasheet ID: A3992SB-T 516037