Texas Instruments TPS55332QPWPRQ1

Overview

TPS55332QPWPRQ1 from Texas Instruments is an automotive-grade, monolithic 2.2-MHz boost DC/DC converter with integrated 3-A/60-V power MOSFET, 2.5-V ±1.5% feedback reference, programmable soft-start (SS), and voltage supervisor with reset output (RST). It operates from 1.5 V to 40 V input and delivers up to 50 V output in boost mode, supporting battery-powered lighting and infotainment systems requiring high-voltage rail generation.

For engineers reviewing the TPS55332QPWPRQ1 datasheet, TPS55332QPWPRQ1 pinout, TPS55332QPWPRQ1 application, or TPS55332QPWPRQ1 equivalent, key selection criteria include its 80 kHz–2.2 MHz adjustable switching frequency, external slew rate control (Rslew), programmable undervoltage monitoring via RST_TH, thermal shutdown at 175°C, and AEC-Q100 qualification for automotive use.

Technical Context

The TPS55332QPWPRQ1 implements voltage-mode control using the VSENSE feedback node and cycle-by-cycle current limiting on the internal NMOS switch. Its oscillator frequency is set by an external resistor on RT or synchronized externally via SYNC (f_ext ∈ [f_sw, 2×f_sw]), enabling EMI reduction in noise-sensitive automotive domains.

It integrates a programmable power-on-reset delay (Cdly), open-drain RST output with deglitch filtering (~20 µs), and thermal shutdown with 30°C hysteresis. The VReg pin provides internal biasing during startup and supports VIN operation down to 1.5 V once Vout exceeds Vsupply, enabled by an integrated forward-biased diode between VReg and VIN.

Key Specifications

Pinout & Package

TPS55332QPWPRQ1 is housed in a thermally enhanced 20-pin HTSSOP (PWP) package (6.50 mm × 4.40 mm) with PowerPAD™ exposed thermal pad for improved heat dissipation in automotive under-hood environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost converter applications.

Compared with LM5122MH/NOPB and TPS40210DGQR, the TPS55332QPWPRQ1 delivers higher integration (integrated FET, RST, Cdly, SS, VReg), tighter automotive qualification (AEC-Q100 Grade 1), and lower system-level component count-making it optimal for space-constrained, safety-aware automotive power rails.

Availability

TPS55332QPWPRQ1 is available at Aetrix Electronics and suitable for automotive lighting, infotainment display, and ADAS camera power supply applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for TPS55332QPWPRQ1 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 designing analog ICs, embedded processors, and digital signal solutions for automotive, industrial, and communications markets.

The TPS55332QPWPRQ1 belongs to TI's automotive-qualified DC/DC converter product line, engineered specifically for high-reliability, high-voltage boost applications in vehicles-including headlamps, displays, and sensor modules-where input transients, thermal stress, and functional safety are critical.

FAQ

What is the minimum input voltage required for TPS55332QPWPRQ1 to start up?

The TPS55332QPWPRQ1 requires a minimum of 3.6 V on VIN to initiate internal circuit stabilization and begin soft-start. Once operational, it sustains regulation down to 1.5 V input-enabling compatibility with automotive cold-crank conditions. This dual-threshold behavior is enabled by the internal VReg-to-VIN diode path, which biases the controller once Vout exceeds Vsupply.

How does the RST output behave during thermal shutdown in TPS55332QPWPRQ1?

During thermal shutdown, the TPS55332QPWPRQ1 disables the internal switch and allows Vout to decay. When Vout falls below the threshold set by RST_TH, the RST pin is asserted low after the deglitch filter (~20 µs) expires. RST remains low until Vout recovers above the threshold and the Cdly timer completes its delay-ensuring clean MCU reset signaling even during thermal faults.

Can TPS55332QPWPRQ1 synchronize to an external clock while operating at 2.2 MHz?

Yes-the TPS55332QPWPRQ1 accepts external synchronization on the SYNC pin across its full 80 kHz–2.2 MHz range. For 2.2 MHz operation, the external clock must be within 2.2 MHz ±0% to 100% (i.e., 2.2 MHz ≤ f_ext ≤ 4.4 MHz), per the datasheet condition f_sw < f_ext < 2×f_sw. The device locks to the external clock within ~2 cycles and defaults to internal RT-based oscillation if SYNC is inactive for >32 µs.

What is the purpose of the VReg pin on TPS55332QPWPRQ1, and how should it be connected?

The VReg pin on TPS55332QPWPRQ1 provides an internal ~5 V regulated supply for biasing internal circuitry and is internally tied to Vout. It includes a forward-biased diode to VIN, allowing it to assist startup when Vout > Vsupply. No external connection is required-VReg must remain unconnected and float, as it is not intended for external load sourcing.

How is the output voltage programmed on TPS55332QPWPRQ1?

The output voltage of TPS55332QPWPRQ1 is programmed using a resistor divider from Vout to GND, with the midpoint connected to VSENSE. The formula is Vout = 2.5 V × (1 + R8/R7), where R7 connects VSENSE to GND and R8 connects Vout to VSENSE. The internal 2.5 V ±1.5% reference dominates accuracy; total output tolerance depends on resistor tolerance, tempco, and layout parasitics.