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DRV81545
  • DRV81545
  • DRV81545

DRV81545

ACTIVE

55V, 2A 4-channel low-side driver with independent overtemperature and overcurrent protection

Texas Instruments DRV81545 Product Info

1 April 2026 1

Parameters

Control interface

Hardware (GPIO)

Control mode

PWM

Vs (max) (V)

55

Vs (min) (V)

4.5

Vs ABS (max) (V)

60

Peak output current (A)

2

Operating temperature range (°C)

-40 to 125

Rating

Catalog

Topology

LSS

Package

HTSSOP (PWP)-20-41.6 mm² 6.5 x 6.4

Features

  • Four-channel integrated low-side switches
    • 235mΩ RDS(ON) at 25°C
    • Output stage 55V operating maximum (60V absolute maximum)
    • Low minimum operating supply voltage range with stable RDS(ON) across voltage: 4.5V
    • Selectable current limit from 0.5A up to 3A per channel
    • Integrated catch diodes for flexible decay (external TVS/Zener) as an alternate current path on switch turn-off
  • Hardware INx interface for fast switching up to 250kHz
  • Diagnostic feedback
    • MCU fault interrupt signal (nFAULT)
  • Thermally enhanced surface mount package (PWP20)
  • Protection features
    • User settable current limit
    • Independent overtemperature, overcurrent protection for each switch
    • Configurable over-current cut-off delay (COD)
  • Four-channel integrated low-side switches
    • 235mΩ RDS(ON) at 25°C
    • Output stage 55V operating maximum (60V absolute maximum)
    • Low minimum operating supply voltage range with stable RDS(ON) across voltage: 4.5V
    • Selectable current limit from 0.5A up to 3A per channel
    • Integrated catch diodes for flexible decay (external TVS/Zener) as an alternate current path on switch turn-off
  • Hardware INx interface for fast switching up to 250kHz
  • Diagnostic feedback
    • MCU fault interrupt signal (nFAULT)
  • Thermally enhanced surface mount package (PWP20)
  • Protection features
    • User settable current limit
    • Independent overtemperature, overcurrent protection for each switch
    • Configurable over-current cut-off delay (COD)

Description

The DRV81545 is a four-channel low-side switch driver that operates from 4.5V to 55V and supports a wide range of load currents. The device integrates four low-side switches with a RDS(ON) of 235mΩ, each with a freewheeling diode to the VCLAMP pin. This feature allows the user to either recirculate current or connect an external TVS for inductive load turn-off.

The device can be controlled through a hardware GPIO interface. Each channel features individual overtemperature protection, and an analog current limit adjustable with an external resistor on the ILIM pin. There is an optional cut-off delay (COD) configuration which limits the duration of a current-limiting condition on the respective channel, helping to prevent damage to the device or the load. Faults are indicated on a fault output pin (nFAULT).

The DRV81545 is a four-channel low-side switch driver that operates from 4.5V to 55V and supports a wide range of load currents. The device integrates four low-side switches with a RDS(ON) of 235mΩ, each with a freewheeling diode to the VCLAMP pin. This feature allows the user to either recirculate current or connect an external TVS for inductive load turn-off.

The device can be controlled through a hardware GPIO interface. Each channel features individual overtemperature protection, and an analog current limit adjustable with an external resistor on the ILIM pin. There is an optional cut-off delay (COD) configuration which limits the duration of a current-limiting condition on the respective channel, helping to prevent damage to the device or the load. Faults are indicated on a fault output pin (nFAULT).

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