| Number of full bridges | 1 |
| Vs (Min) (V) | 4.5 |
| Vs ABS (Max) (V) | 50 |
| Peak output current (A) | 4.1 |
| RDS(ON) (HS + LS) (mOhms) | 450 |
| Sleep current (uA) | 1 |
| Control mode | PWM |
| Control interface | Hardware (GPIO) |
| Features | Current Regulation, Integrated Current Sensing, Low-Power Sleep Mode |
| Rating | Catalog |
| Operating temperature range (C) | -40 to 150 |
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N-channel H-bridge brushed DC motor driver
- 4.5-V to 48-V operating supply voltage range
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Pin-to-pin, RDS(on), voltage, and current sense/regulation variants (external shunt resistor and integrated current mirror)
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DRV8870: 6.5-V to 45-V, 565-mΩ, shunt
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DRV8251: 4.5-V to 48-V, 450-mΩ, shunt
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DRV8251A: 4.5-V to 48-V, 450-mΩ, mirror
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DRV8231: 4.5-V to 33-V, 600-mΩ, shunt
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DRV8231A: 4.5-V to 33-V, 600-mΩ, mirror
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- High output current capability: 4.1-A Peak
- PWM control interface
- Supports 1.8-V, 3.3-V, and 5-V logic inputs
- Integrated IPROPI current sensing for stall detection and current regulation
- Low-power sleep mode
- <1-μA at VVM = 24-V, TJ = 25°C
- Small package and footprint
- 8-Pin HSOP with PowerPAD?, 4.9 × 6.0 mm
- Integrated protection features
- VM undervoltage lockout (UVLO)
- Auto-retry overcurrent protection (OCP)
- Thermal shutdown (TSD)
The DRV8251A device is an integrated motor driver with N-channel H-bridge, charge pump, current sense feedback, current regulation, and protection circuitry. The charge pump improves efficiency by supporting N-channel MOSFET half bridges and 100% duty cycle driving.
An internal current mirror architecture on the IPROPI pin implements current sensing and regulation. This eliminates the need for a large power shunt resistor, saving board area and reducing system cost. The IPROPI current-sense output allows a microcontroller to detect motor stall or changes in load conditions. The external voltage reference pin, VREF, determines the threshold of current regulation during start-up and stall events without interaction from a microcontroller.
A low-power sleep mode achieves ultra-low quiescent current draw by shutting down most of the internal circuitry. Internal protection features include supply undervoltage lockout, output overcurrent, and device overtemperature.
The DRV8251A is part of a family of devices which come in pin-to-pin, scalable RDS(on) and supply voltage options to support various loads and supply rails with minimal design changes. See Section 5 for information on the devices in this family. View the full portfolio of brushed motor drivers on ti.com.