A3972SB-T

Series: -
Number of Outputs: 1
Evaluation Tools: -
Packaging: Tube
Applications: Stepper Motor Driver
Mounting Type: Through Hole
Current - Output: ±1.5A
Voltage - Supply: 4.5 V ~ 5.5 V
Operating Temperature: -20°C ~ 85°C
Manufacturer: Allegro Microsystems Inc
Package / Case: 24-DIP (0.300", 7.62mm)
Supplier Device Package: 24-DIP
Voltage - Load: 15 V ~ 50 V


Features:

±1.5 A, 50 V Continuous Output Rating
Low r_DS(on) DMOS Output Drivers
Optimized Microstepping via 6-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
Precision 2 V Reference
Inputs Compatible with 3.3 V or 5 V Control Signals
Sleep and Idle Modes


Pinout




Specifications

Load Supply Voltage, V_BB ................ 50 V
Output Current, I_OUT.................... ±1.5 A
Logic Supply Voltage, V_DD................ 7.0 V
Logic Input Voltage Range,
V_IN .......................... -0.3 V to V_DD + 0.3 V
Reference Voltage, V_REF ..................... 3 V
Sense Voltage (dc), V_S ................. 500 mV
Package Power Dissipation,
P_D ................................................... 3.1 W
Operating Temperature Range,
T_A ................................. -20°C to +85°C
Junction Temperature, T_J ........... +150°C
Storage Temperature Range,
T_S ............................... -55°C to +150°C
Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified current rating or a junction temperature of 150°C.


Description

Designed for pulse-width modulated (PWM) current control of bipolar microstepping stepper motors, the A3972SB is capable of continuous output currents to ±1.5 A and operating voltages to 50 V. Internal fixed off-time PWM current-control timing circuitry can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes.

The desired load-current level is set via the serial port with two 6-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 1.56% increments of the maximum value.

Synchronous rectification circuitry allows the load current to flow through the low r_DS(on) of the DMOS output driver during the current decay. This feature will eliminate the need for external clamp diodes in most applications, saving cost and external component count, while minimizing power dissipation. Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover-current protection. Special powerup sequencing is not required.

The A3972SB is supplied in a 24-lead plastic DIP with a copper batwing power tab. The power tab is at ground potential and needs no electrical isolation. The lead (Pb) free version has 100% matte tin leadframe plating.

Parameters:

Technical/Catalog Information	A3972SB-T
Vendor	Allegro Microsystems Inc
Category	Integrated Circuits (ICs)
Applications	Stepper Motor Driver
Number of Outputs	1
Voltage - Supply	4.5 V ~ 5.5 V
Voltage - Load	15 V ~ 50 V
Current - Output	±1.5A
Operating Temperature	-20°C ~ 85°C
Package / Case	24-DIP
Packaging	Tube
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	A3972SB T A3972SBT