Texas Instruments DRV591VFP

Overview

DRV591VFP from Texas Instruments is a high-efficiency, ±3-A bridge-tied load (BTL) power amplifier optimized for thermoelectric cooler (TEC) and laser diode biasing in 2.8 V to 5.5 V systems. It features fixed 2.34 V/V gain, dual selectable PWM switching frequencies (100 kHz / 500 kHz), and integrated over-current, thermal, and under-voltage fault protection with open-drain FAULT0/FAULT1 indicators.

For engineers reviewing the DRV591VFP datasheet, DRV591VFP pinout, DRV591VFP application, or DRV591VFP equivalent, key selection criteria include its 9×9 mm PowerPAD™ QFP-32 package, 65 mΩ typical r_DS(on) per side at 5 V, 130°C thermal trip point, and differential input architecture supporting TEC current control with <100 mV offset voltage.

Technical Context

The DRV591VFP implements a fully integrated H-bridge PWM amplifier with internal ramp generator, gate drivers, and protection logic. Its dual-frequency operation (100 kHz or 500 kHz) is selected via FREQ pin level and ROSC/COSC component values, while INT/EXT pin enables external clock synchronization at ~250 kHz.

It uses separate analog (AVDD/AGND) and power (PVDD/PGND) domains with isolated PowerPAD™ thermal pad tied to AGND. Fault reporting uses two open-drain outputs (FAULT0/FAULT1) encoding over-current, under-voltage, and over-temperature events in real time without latching-over-current recovery is automatic after 3–5 µs high-impedance blanking.

Key Specifications

Pinout & Package

DRV591VFP is housed in a 32-pin HLQFP (VFP) package with exposed PowerPAD™ thermal pad soldered to AGND. The package measures 9 mm × 9 mm × 1.2 mm and is RoHS-compliant with NIPDAU finish and MSL Level-3 rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current PWM amplifier applications.

Compared with DRV592VFP, DRV591VFP offers lower BOM cost and simpler layout by omitting current-sense circuitry, while retaining identical thermal performance and protection thresholds; compared with TPS63020DSJR, it delivers true bidirectional current control essential for TEC polarity reversal - a capability absent in switching regulators.

Availability

DRV591VFP is available at Aetrix Electronics and suitable for thermoelectric cooler control, laser diode biasing, and portable battery-powered cooling systems requiring stable component supply across industrial, medical, and test equipment lifecycles.

Supply support for DRV591VFP includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision amplifiers and thermal control ICs.

The DRV591VFP belongs to TI's high-efficiency power amplifier product line, engineered specifically for bidirectional current delivery in thermoelectric and optoelectronic applications demanding robust fault handling and minimal thermal footprint.

FAQ

What is the maximum continuous output current specification for the DRV591VFP?

The DRV591VFP supports ±3 A continuous output current under recommended operating conditions (TA = –40°C to 85°C, VDD = 5 V). This rating assumes proper PCB thermal design with PowerPAD™ soldered to a thermal land and adequate copper area. At 3 A and 65 mΩ total r_DS(on), power dissipation is approximately 1.17 W - well within the 4.1 W package rating when θ_JA = 29.4°C/W is achieved.

How does the DRV591VFP implement fault reporting, and what do the FAULT0 and FAULT1 pins indicate?

The DRV591VFP uses two open-drain outputs - FAULT0 (pin 10) and FAULT1 (pin 9) - to encode three fault conditions: over-current (0,0), under-voltage (0,1), and over-temperature (1,0). Both pins default high when pulled up externally; normal operation is indicated by (1,1). The DRV591VFP does not latch faults - over-temperature clears automatically below 130°C, and over-current resets after brief blanking, enabling self-recovery without MCU intervention.

Can the DRV591VFP operate from a 3.3 V supply, and how does performance change versus 5 V operation?

Yes, the DRV591VFP operates from 2.8 V to 5.5 V, including 3.3 V nominal rails. At 3.3 V, r_DS(on) increases to 80–140 mΩ (vs. 65 mΩ at 5 V), reducing max output voltage swing to ~3.1 V at ±3 A. Quiescent current drops to 2–8 mA (vs. 2–12 mA at 5 V), improving light-load efficiency. Common-mode input range narrows to 1.2–2.1 V, requiring adjusted input biasing - all confirmed in the SLOS389A datasheet's electrical characteristics table.

What are the required external components to configure the DRV591VFP for 500 kHz switching frequency?

To configure the DRV591VFP for 500 kHz operation, connect a 120 kΩ resistor from ROSC (pin 3) to AGND and a 220 pF capacitor from COSC (pin 4) to AGND, while pulling FREQ (pin 32) to GND (logic low) and INT/EXT (pin 31) to VDD (logic high). These values are specified in Table 1 of the SLOS389A datasheet and ensure stable internal oscillator timing with <±10% tolerance across temperature.

Is the DRV591VFP pin-compatible with any newer-generation TI amplifiers for upgrade paths?

The DRV591VFP shares the same 32-pin HLQFP (VFP) package and core pinout with the pin-compatible DRV592VFP, which adds an integrated current-sense amplifier and enhanced fault reporting. No changes to PCB layout or power/ground routing are needed when upgrading - only minor schematic updates for the sense output and optional diagnostic signals. The DRV591VFP and DRV592VFP both support identical voltage ranges, thermal thresholds, and output current ratings.