A4988
Key datasheet specifications and the closest alternatives, ranked by parametric similarity and grounded in the manufacturer datasheet.
This Allegro MicroSystems datasheet covers the A4988 DMOS microstepping driver, a complete motor controller for bipolar stepper motors. It simplifies operation with an integrated translator, supporting up to sixteenth-step modes without complex programming. Key features include 35 V load supply voltage, ±2 A output current, and automatic selection of slow or mixed current decay modes to reduce noise. The device offers low power dissipation via synchronous rectification and includes robust protection circuits like thermal shutdown, UVLO, and crossover-current protection. Packaged in a compact 28-contact QFN with an exposed thermal pad, it is ideal for applications where microprocessors are unavailable or overburdened.
Datasheet parameters
| Parameter | Min | Typ | Max | Conditions |
|---|---|---|---|---|
| quiescent current | — | — | 4 mA | fPWM< 50 kHz |
| output current | — | 1.5 A | — | |
| supply voltage range | 8 V | — | 35 V | Operating |
| rds on | — | 320 mOhm | 430 mOhm | Source Driver, IOUT = –1.5 A |
| forward voltage | — | — | 1.2 V | Source Diode, IF = –1.5 A |
| operating temperature | -20 °C | — | 85 °C | |
| driver count | — | 2 | — |
Closest matches to A4988
Frequently asked questions
What is the driver count for the A4988?
The driver count is 2.
What is the forward voltage of the source diode when IF = –1.5 A?
The forward voltage is 1.2 V.
What is the maximum operating temperature for the A4988?
The operating temperature is 85 °C.
What is the output current rating for the A4988?
The output current is 1.5 A.
What is the quiescent current when fPWM < 50 kHz?
The quiescent current is 4 mA when fPWM < 50 kHz.
What is the rds on value for the Source Driver at IOUT = –1.5 A?
The rds on value is 320 mOhm.
What is the supply voltage range for the A4988 during operation?
The supply voltage range is 35 V during operation.