Texas Instruments TPS55340QRTETQ1

Overview

TPS55340QRTETQ1 from Texas Instruments is an automotive-grade, monolithic non-synchronous DC/DC converter with integrated 5-A/40-V low-side MOSFET, supporting boost, SEPIC, and isolated flyback topologies. It operates from 2.9 V to 38 V input, delivers ±0.7% reference accuracy, achieves 0.5 mA quiescent current, and features programmable 100 kHz–2.5 MHz switching frequency - used in automotive start-stop pre-boost and USB power delivery systems.

For engineers reviewing the TPS55340QRTETQ1 datasheet, TPS55340QRTETQ1 pinout, TPS55340QRTETQ1 application, or TPS55340QRTETQ1 equivalent, key selection considerations include AEC-Q100 Grade 1 qualification (–40°C to 125°C ambient), internal slope compensation for stable current-mode control above 50% duty cycle, soft-start programmability via external capacitor, and synchronization capability to external clock signals up to 1 MHz.

Technical Context

The TPS55340QRTETQ1 implements fixed-frequency current-mode PWM control with internal ramp generation for slope compensation, enabling stable operation in boost, SEPIC, and flyback configurations across wide duty cycles. Its transconductance error amplifier (240–440 µmho) drives the COMP pin with clamped output (0.75 V / 3.1 V), and supports loop compensation via external RC network.

Switching frequency is set either by resistor on FREQ pin (480 kΩ → ~100 kHz; 18 kΩ → ~2.5 MHz) or synchronized externally (200 kHz–1 MHz), with foldback protection reducing frequency to 25% during overcurrent. Thermal shutdown activates at 165°C (15°C hysteresis), and UVLO ensures reliable startup above 2.5 V (140 mV hysteresis).

Key Specifications

Pinout & Package

TPS55340QRTETQ1 uses a thermally enhanced 3 mm × 3 mm WQFN-16 package with PowerPad™ for low junction-to-board thermal resistance (3.5°C/W). The exposed PowerPAD must be soldered to AGND with thermal vias for optimal power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5122QMHX/NOPB and TPS40210DGQR, the TPS55340QRTETQ1 offers tighter integration (5-A switch + compensation), automotive qualification, and lower BOM count - making it optimal for space-constrained, AEC-Q100-compliant boost/SEPIC designs below 38-V input.

Availability

TPS55340QRTETQ1 is available at Aetrix Electronics and suitable for automotive start-stop systems, USB power delivery modules, and industrial 24-V rail boosters requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.

Supply support for TPS55340QRTETQ1 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 connectivity solutions for automotive, industrial, and personal electronics markets.

The TPS55340QRTETQ1 belongs to TI's automotive-qualified DC/DC converter product line, engineered specifically for high-reliability power conversion in start-stop, infotainment, and body electronics systems operating across extreme temperature and voltage conditions.

FAQ

What is the maximum output current supported by the TPS55340QRTETQ1?

The TPS55340QRTETQ1 integrates a 5-A, 40-V low-side MOSFET with typical R_DS(on) of 60 mΩ at 5 V. Its current limit is specified at 5.25–7.75 A depending on temperature and operating conditions. In practical boost designs with proper thermal management (e.g., PowerPad soldered with thermal vias), the TPS55340QRTETQ1 reliably delivers up to 3.5 A continuous output current at 12-V input to 24-V output, maintaining <150°C junction temperature per thermal modeling.

Does the TPS55340QRTETQ1 support synchronization to an external clock?

Yes, the TPS55340QRTETQ1 supports external clock synchronization via its SYNC pin, accepting logic-level signals from 200 kHz to 1 MHz. When synchronized, the internal oscillator is disabled and switching follows the external clock edge with ±20% frequency tolerance relative to the resistor-set frequency. This feature enables EMI reduction through frequency dithering and multi-converter phase alignment in complex power systems.

How is soft-start configured on the TPS55340QRTETQ1?

Soft-start on the TPS55340QRTETQ1 is configured using an external capacitor connected between the SS pin and AGND. An internal 6-µA current source charges this capacitor, linearly ramping the COMP pin clamp voltage until it reaches 1.8 V - at which point soft-start completes. For example, a 100-nF capacitor yields ~30-ms soft-start time. During shutdown (EN < 0.68 V for >1 ms), the SS capacitor discharges through a 5-kΩ internal resistor to prepare for next startup.

What protection features does the TPS55340QRTETQ1 include?

The TPS55340QRTETQ1 includes cycle-by-cycle overcurrent protection (triggered at 5.25–7.75 A), thermal shutdown at 165°C (with 15°C hysteresis), undervoltage lockout (UVLO) at 2.5 V (140 mV hysteresis), and input overvoltage clamp. It also implements frequency foldback during sustained overcurrent and pulse-skipping at light loads to maintain regulation while minimizing losses - all without requiring external fault-handling circuitry.

Can the TPS55340QRTETQ1 be used in SEPIC or flyback topologies?

Yes, the TPS55340QRTETQ1 is explicitly designed for boost, SEPIC, and isolated flyback topologies. Its non-synchronous architecture, integrated 5-A/40-V switch, and current-mode control with internal slope compensation make it suitable for all three. TI provides reference designs (e.g., TIDA-00276 for SEPIC, TIDA-01389 for flyback) confirming stable operation with proper transformer/inductor selection and COMP compensation.