Texas Instruments TPS55010RTER

Overview

TPS55010 from Texas Instruments is a 2.95-V to 6-V input, isolated fly-buck DC/DC transformer driver with integrated half-bridge MOSFETs (45 mΩ R_DS(on)), primary-side feedback, and adjustable 100–2000 kHz switching frequency. It delivers up to 2 W of isolated output power for RS-485/RS-232 interfaces, IGBT gate drivers, and medical floating supplies.

For engineers reviewing the TPS55010 datasheet, TPS55010 pinout, TPS55010 application, or TPS55010 equivalent, key selection considerations include primary-side regulation architecture, RT/CLK synchronization capability, EN-adjustable UVLO, cycle-by-cycle current limiting, and thermal shutdown behavior in compact 3 mm × 3 mm QFN packaging.

Technical Context

The TPS55010 implements fixed-frequency peak current-mode control using an internal transconductance error amplifier (245 µA/V) referenced to a precision 0.829 V bandgap voltage. Regulation is achieved via primary-side feedback through external resistors on VSENSE, eliminating optocouplers or secondary-side sensing.

Its integrated half-bridge power stage uses two n-channel MOSFETs with matched 45 mΩ typical R_DS(on), driven by a bootstrap circuit (BOOT–PH) requiring a 0.1 µF X7R/X5R capacitor. The RT/CLK pin supports both resistor-set frequency (100–2000 kHz) and PLL-based synchronization (300–2000 kHz) with ≤50 µs lock time.

Key Specifications

Pinout & Package

TPS55010 is housed in a thermally enhanced 3 mm × 3 mm, 16-pin WQFN package with exposed thermal pad (Pin 17). The package supports high-power density layouts with multiple vias to internal ground planes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated fly-buck transformer driver applications.

Compared with LM5160QPWPRQ1 and UCC28740DR, the TPS55010 uniquely integrates both high- and low-side MOSFETs with primary-side feedback in a 3 mm × 3 mm footprint-enabling compact, self-contained isolated bias generation without external gate drivers or optocouplers.

Availability

TPS55010 is available at Aetrix Electronics and suitable for industrial PLCs, isolated communication interfaces, IGBT gate drivers, and medical equipment requiring stable component supply and long-term manufacturability.

Supply support for TPS55010 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 over 50 years of innovation in high-reliability power conversion solutions.

The TPS55010 belongs to TI's isolated power IC product line, engineered specifically for compact, low-noise, transformer-coupled DC/DC conversion in space-constrained industrial and medical systems requiring galvanic isolation.

FAQ

What is the maximum output power supported by the TPS55010?

The TPS55010 is rated for up to 2 W of isolated output power under recommended operating conditions. This limit is determined by thermal performance in the 3 mm × 3 mm QFN package and the 45 mΩ R_DS(on) of its integrated MOSFETs. Actual achievable power depends on transformer selection, PCB layout, ambient temperature, and airflow. Derating is required above 85°C ambient or with limited copper area.

Can the TPS55010 synchronize to an external clock, and what are the timing requirements?

Yes, the TPS55010 supports external clock synchronization via the RT/CLK pin. The input clock must swing below 0.4 V and above 2.2 V with minimum pulse width of 75 ns. Synchronization is valid from 300 kHz to 2000 kHz, and PLL lock occurs within 50 µs. The device automatically reverts to resistor-set mode if the clock stops, ensuring fail-safe operation without external intervention.

How does primary-side feedback work in the TPS55010, and what components are required?

The TPS55010 uses primary-side feedback by sensing reflected voltage across a resistor divider (RLS/RHS) connected between CPRI and VSENSE. The internal 0.829 V reference compares against this divided voltage to regulate output. No optocoupler or secondary-side components are needed. Recommended divider resistors are 1% tolerance or better, with RLS = 10 kΩ as a starting point and RHS calculated per Equation 1 in the datasheet.

What is the purpose of the BOOT–PH capacitor, and what value and type are recommended?

The BOOT–PH capacitor provides gate drive voltage for the integrated high-side MOSFET. A 0.1 µF ceramic capacitor with X7R or X5R dielectric and ≥10 V rating is required. This ensures stable boot voltage during high-duty-cycle operation and prevents high-side FET turn-off due to insufficient gate drive. Placement must minimize loop inductance-direct connection between BOOT and PH pins is mandatory.

Does the TPS55010 support adjustable undervoltage lockout, and how is it implemented?

Yes, the TPS55010 supports adjustable input UVLO using the EN pin. Its internal 1.2 µA pull-up current source allows setting custom start/stop thresholds with two external resistors. When EN voltage falls below 1.18 V, the device disables; rising above 1.25 V enables operation. Hysteresis of 3.4 µA ensures clean transitions. Default UVLO is 2.6 V when EN is left floating.