Texas Instruments TPS61235PRWLR

Overview

TPS61235PRWLR from Texas Instruments is a synchronous boost DC-DC converter optimized for single-cell Li-ion/Li-polymer battery-powered USB power delivery applications. It delivers up to 3.5 A output current at 5.1 V fixed output voltage, achieves up to 97% efficiency at 3.3-V-to-5-V conversion, integrates dual 14-mΩ power switches, and supports programmable constant-current regulation via the CC pin. It is used in power banks and USB Type-C charging ports requiring high-efficiency, compact, and thermally robust step-up conversion.

For engineers reviewing the TPS61235PRWLR datasheet, TPS61235PRWLR pinout, TPS61235PRWLR application, or TPS61235PRWLR equivalent, key selection considerations include its 5.1-V fixed output, 1-MHz switching frequency, 10-µA light-load quiescent current, true input-output disconnection in shutdown, and integrated overvoltage/thermal protection - all in a 2.5-mm × 2.5-mm VQFN-9 package.

Technical Context

The TPS61235PRWLR employs valley-current-mode control with quasi-constant on-time PWM operation at medium-to-heavy loads and transitions to PFM mode under light load to maintain high efficiency. It implements two independent regulation loops: one for constant voltage (CV) using internal 1.244-V reference and fixed FB-to-VOUT connection, and another for constant current (CC) using external resistor-programmed threshold at the CC pin.

Its functional architecture includes integrated soft-start with pre-charge phase (ILIM_pre = 0.05–1.7 A), cycle-by-cycle valley current limiting (ILIM = 6.5–9.5 A), reverse-current blocking, and open-drain INACT load-status indication. The device enters pass-through mode when VIN approaches VOUT − 0.6 V, with hysteresis to prevent oscillation.

Key Specifications

Pinout & Package

TPS61235PRWLR is housed in a thermally enhanced 2.5-mm × 2.5-mm VQFN-9 package (RWL suffix) with exposed thermal pad. Pin 1 is PGND; pin 9 is VOUT. The package supports high-density PCB layout and efficient heat dissipation via bottom-side thermal pad soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61236PRWLR, TPS61235PRWLR eliminates FB resistor selection and calibration overhead for USB-compliant 5-V designs; compared with MT9700A-5.0, it adds programmable current limiting and real-time load monitoring - critical for USB PD negotiation and thermal-aware power bank firmware.

Availability

TPS61235PRWLR is available at Aetrix Electronics and suitable for power banks, USB Type-C charging ports, and battery-powered USB hubs requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS61235PRWLR 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 ICs, with decades of expertise in high-efficiency DC-DC conversion and battery-powered system solutions.

The TPS6123x product line was designed specifically for high-current, high-efficiency USB power delivery in portable Li-ion devices - emphasizing compact size, thermal resilience, and intelligent current regulation without external components.

FAQ

What is the fixed output voltage of the TPS61235PRWLR?

The TPS61235PRWLR has a factory-trimmed fixed output voltage of 5.1 V, specified from 5.0 V to 5.2 V in PWM mode and 5.2 V in PFM mode. This value is internally set and does not require external feedback resistors, simplifying design for USB 5-V applications. The TPS61235PRWLR achieves tight regulation with 0.06%/V line regulation and 0.06%/A load regulation under typical conditions.

Does the TPS61235PRWLR support constant-current regulation?

Yes, the TPS61235PRWLR supports programmable constant-current regulation via its CC pin. Connecting an external resistor (e.g., 61.9 kΩ) between CC and AGND sets the output current limit (e.g., 2 A), with accuracy of ±10% at 25°C. The CC pin also provides real-time current monitoring through a proportional voltage signal, enabling host MCU-based power management in systems using the TPS61235PRWLR.

What package type and thermal characteristics does the TPS61235PRWLR use?

The TPS61235PRWLR uses a 2.5-mm × 2.5-mm VQFN-9 package (RWL) with exposed thermal pad. Its thermal metrics include RθJA = 28.7°C/W, RθJB = 10.9°C/W, and RθJC(bottom) = 1.6°C/W. These values enable effective heat transfer to the PCB, supporting continuous 3.5-A operation in compact layouts when proper copper pour and via stitching are implemented beneath the thermal pad.

How does the TPS61235PRWLR handle shutdown and reverse current?

The TPS61235PRWLR implements true input-output disconnection during shutdown: when EN is pulled low, both internal power switches turn off and the output is isolated from the input, reducing shutdown current to less than 1 µA and blocking reverse current flow. This behavior prevents battery discharge through the output and supports safe hot-plug operation in USB applications using the TPS61235PRWLR.

Can the TPS61235PRWLR operate with input voltages below 2.7 V?

Yes, the TPS61235PRWLR supports input voltages down to 2.3 V per its recommended operating conditions. However, UVLO triggers at 2.2–2.3 V (with 125-mV hysteresis), so reliable start-up requires VIN > 2.3 V. At 2.7-V input, the device delivers up to 3.5-A output at 5.1 V with ~90% efficiency - making the TPS61235PRWLR suitable for deeply discharged Li-ion cells in power bank end-of-discharge scenarios.