Texas Instruments TPS63051RMWT

Overview

TPS63051RMWT from Texas Instruments is a fixed-output 3.3 V, 500 mA synchronous buck-boost DC/DC converter in a 2.5 mm × 2.5 mm HotRod™ QFN-12 package. It operates across 2.5 V–5.5 V input, delivers >90% efficiency in boost and >95% in buck mode, features adjustable input current limit and soft-start, and is designed for battery-powered portable electronics requiring seamless voltage regulation.

For engineers reviewing the TPS63051RMWT datasheet, TPS63051RMWT pinout, TPS63051RMWT application, or TPS63051RMWT equivalent, key selection criteria include its fixed 3.3 V output, programmable inrush current limiting via ILIM0/ILIM1 pins, PFM/PWM mode control, power-good (PG) open-drain signaling, and thermal shutdown at 140°C with 20°C hysteresis.

Technical Context

The TPS63051RMWT implements average-current-mode control using four internal N-channel MOSFETs, enabling true buck or boost operation with automatic, seamless transition between modes based on VIN vs. VOUT. Its fixed 2.5 MHz switching frequency ensures predictable EMI behavior and supports compact external components (1.5 µH inductor, 10 µF output capacitor).

It integrates undervoltage lockout (1.7 V threshold, 200 mV hysteresis), overvoltage protection (clamped at ~6.7 V), short-circuit detection (<1.2 V output), and load disconnect during shutdown. The PG pin reflects output regulation status (active-low below 90% nominal, high-impedance above 95%), conditioned by EN and ILIMx logic states per Table 1.

Key Specifications

Pinout & Package

TPS63051RMWT uses a 2.5 mm × 2.5 mm, 12-pin HotRod™ QFN package with exposed thermal pad (RMW suffix). Pin numbering follows TI's standard top-view layout: Pin 1 = L1, Pin 2 = GND, Pin 3 = L2, Pin 4 = VOUT, Pin 5 = FB, Pin 6 = PFM/PWM, Pin 7 = SS, Pin 8 = PG, Pin 9 = GND, Pin 10 = ILIM0, Pin 11 = EN, Pin 12 = VIN.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS63051RMWT, TPS63050RMWT offers output flexibility at the cost of two external resistors, while MP2155GQZ-P trades feature richness for smaller size and lower unit cost-making each optimal for distinct design priorities: precision fixed output, multi-voltage adaptability, or minimal footprint.

Availability

TPS63051RMWT is available at Aetrix Electronics and suitable for cellular handsets, smart grid meters, wireless sensor nodes, and portable medical devices requiring stable component supply across long production lifecycles.

Supply support for TPS63051RMWT 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.

The TPS6305x product line was engineered specifically for battery-powered portable electronics needing wide-input, fixed-or-adjustable buck-boost regulation with ultra-low quiescent current and robust protection features.

FAQ

What is the maximum continuous output current capability of the TPS63051RMWT?

The TPS63051RMWT delivers up to 500 mA continuous output current in boost mode (VIN ≥ 2.5 V, VOUT = 3.3 V) and up to 1 A in buck mode. Its internal switches are rated for 1 A average current, but the fixed 3.3 V version is characterized and guaranteed for 500 mA in boost due to thermal and efficiency constraints across the full input range. This makes the TPS63051RMWT ideal for mid-power portable applications such as smartphone peripherals or sensor hubs.

Does the TPS63051RMWT require external feedback resistors to set its output voltage?

No, the TPS63051RMWT has an internally trimmed 3.3 V reference and does not require external feedback resistors. Unlike the adjustable TPS63050RMWT, which uses the FB pin with a resistor divider, the TPS63051RMWT connects FB internally to achieve fixed 3.3 V output. This simplifies layout, reduces BOM count, and improves accuracy by eliminating resistor tolerance and temperature drift effects-key for cost-sensitive and space-constrained designs.

How does the PFM/PWM pin affect the operation of the TPS63051RMWT?

The PFM/PWM pin on the TPS63051RMWT selects between two operating modes: logic-low enables automatic PFM/PWM mode for highest light-load efficiency, while logic-high forces continuous PWM mode for lowest output ripple and predictable EMI. In PFM mode, the device pulses only as needed to maintain regulation, reducing quiescent current to ~43 µA; in forced PWM, it runs at fixed 2.5 MHz regardless of load, improving transient response but increasing no-load consumption. This pin gives designers direct control over the efficiency–ripple trade-off.

What thermal performance can be expected from the TPS63051RMWT in a typical 2-layer PCB layout?

In a standard 2-layer PCB with 1 oz copper and moderate copper pour around the thermal pad, the TPS63051RMWT (RMW package) exhibits a junction-to-ambient thermal resistance (RθJA) of 37.3°C/W. At 500 mA output and 3.6 V input, typical power dissipation is ~120 mW, resulting in ~4.5°C junction-to-ambient rise above ambient-well within safe limits. For higher ambient or sustained loads, adding thermal vias under the exposed pad and increasing copper area significantly improves performance, leveraging its low RθJB (8.0°C/W) specification.

Can the TPS63051RMWT safely operate with input voltages below 2.5 V?

No, the TPS63051RMWT has a specified minimum input voltage of 2.5 V per its Recommended Operating Conditions. While absolute maximum ratings allow down to –0.3 V, operation below 2.5 V risks UVLO activation (1.7 V threshold), unstable regulation, or failure to start. The device enters undervoltage lockout below ~1.7 V and will not resume until VIN rises above ~1.9 V due to 200 mV hysteresis. For sub-2.5 V inputs, consider TI's TPS63802 or other ultra-low-VIN buck-boost converters explicitly rated for that range.