DESCRIPTION:

The DRV8251A device is an integrated motor driver with N-channel H-bridge, charge pump, current sensing feedback, current regulation, and protection circuitry. The charge pump enhances efficiency by supporting N-channel MOSFET half-bridges and 100% duty cycle driving. An internal current mirror architecture on the IPROPI pin enables current sensing and regulation, eliminating the need for large power shunt resistors, thereby saving board area and reducing system cost. With the IPROPI current sense output, a microcontroller can detect motor stall or load condition changes. An external voltage reference pin (VREF) determines the current regulation threshold during start-up events and stall conditions without requiring microcontroller interaction. Low-power sleep mode achieves ultra-low quiescent current consumption by shutting down most internal circuits. Internal protection features include power supply undervoltage lockout, output overcurrent, and device overtemperature. The DRV8251A is part of a family of devices with pin-to-pin, scalable RDS(on), and supply voltage options to support different loads and power rails with minimal design changes.

FEATURES:

• N-Channel H-Bridge Brushed DC Motor Driver

• 4.5V to 48V Operating Supply Voltage Range

• Pin-to-Pin, RDS(on), Voltage and Current Sense/Regulation Options (External Shunt Resistor and Integrated Current Mirror)

– DRV8870: 6.5V to 45V, 565mΩ Shunt Resistor

– DRV8251: 4.5V to 48V, 450mΩ Shunt Resistor

– DRV8251A: 4.5V to 48V, 450mΩ Current Mirror

– DRV8231: 4.5V to 33V, 600mΩ Shunt Resistor

– DRV8231A: 4.5V to 33V, 600mΩ Current Mirror

• High Output Current Capability: 4.1A Peak

• PWM Control Interface

• Supports 1.8V, 3.3V, and 5V Logic Inputs

• Integrated IPROPI Current Sensing and Current Regulation for Stall Detection

• Low-Power Sleep Mode

– Less than 1µA at VVM = 24V, TJ = 25°C

• Small Package and Footprint

– 8-Pin HSOP Package with PowerPAD™, 4.9mm × 6.0mm

• Integrated Protection Features

– VM Undervoltage Lockout (UVLO)

– Automatic-Retry Overcurrent Protection (OCP)

– Thermal Shutdown (TSD)

APPLICATIONS:

• Printers

• Robotic Vacuum Cleaners

• Washing Machines and Dryers

• Coffee Machines

• POS Printers

• Electricity Meters

• ATMs (Automated Teller Machines)

• Ventilators

• Surgical Equipment

• Electronic Beds and Bed Controllers

• Fitness Equipment