Texas Instruments TPS627431YFPR

Overview

TPS627431YFPR from Texas Instruments is a 400 mA ultra-low-quiescent-current buck converter optimized for coin-cell-powered wearables and energy-harvesting systems. It operates from 2.15 V to 5.5 V input, delivers eight factory-programmed output voltages (1.3 V–3.1 V), and achieves 360 nA operating IQ with DCS-Control™ topology and automatic 100% duty-cycle mode.

For engineers reviewing the TPS627431YFPR datasheet, TPS627431YFPR pinout, TPS627431YFPR application, or TPS627431YFPR equivalent, key selection criteria include its 400 mA output capability, 1.6 mm × 0.9 mm WCSP package, RF-friendly switching behavior, and verified performance down to 10 µA load current with up to 90% efficiency.

Technical Context

The TPS627431YFPR implements TI's DCS-Control™ topology with dual-loop regulation: an AC loop sensing VOS for fast transient response and a DC feedback loop ensuring ±2.5% output voltage accuracy. It operates at a typical 1.2 MHz switching frequency in PWM mode and transitions seamlessly to PFM-based Power Save Mode below ~1 mA load.

Its functional architecture includes cycle-by-cycle current limiting on both high-side (650 mA typ) and low-side MOSFETs, undervoltage lockout with 2.075 V rising threshold, and auto-100% mode activation when VIN − VOUT falls below 200 mV (typ), eliminating ripple during near-dropout operation.

Key Specifications

Pinout & Package

TPS627431YFPR uses a 1.6 mm × 0.9 mm, 8-ball DSBGA (YFP) package with bottom-side solder balls. Pin mapping follows standard top-view orientation with ball A1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62743YFPR, the TPS627431YFPR provides 33% higher output current and narrower voltage options optimized for BLE SoCs, while MAX77650BEWJ+T adds charging functionality at the cost of layout redesign and higher IQ.

Availability

TPS627431YFPR is available at Aetrix Electronics and suitable for wearable electronics, medical sensors, and Bluetooth LE peripherals requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS627431YFPR 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 company specializing in analog, embedded processing, and power management technologies, with over 90 years of innovation in high-reliability electronics.

The TPS627431YFPR belongs to TI's ultra-low-power DC/DC converter product line, designed specifically for battery-constrained IoT edge devices where multi-year operation and RF coexistence are mandatory design requirements.

FAQ

What is the minimum input voltage required for TPS627431YFPR to start up and operate continuously?

The TPS627431YFPR requires a minimum input voltage of 2.15 V to initiate startup, per its UVLO rising threshold. Once enabled, it continues operating down to 2.0 V input-enabling direct use with aging Li-MnO₂ coin cells. This 2.0 V operational floor is confirmed in Section 7.3 of the official datasheet and validated across temperature ranges from –40°C to 85°C. The TPS627431YFPR sustains regulation and 400 mA output capability throughout this extended dropout range via its auto-100% mode.

How does the TPS627431YFPR achieve 360 nA quiescent current, and is this value measured under load?

The TPS627431YFPR achieves 360 nA typical quiescent current through three integrated techniques: an ultra-low-power voltage reference, a 50 MΩ internal feedback divider network, and aggressive power gating of non-essential blocks in Power Save Mode. This value is measured with EN = VIN, IOUT = 0 µA, VOUT = 1.8 V, and the device not switching-per Section 7.5 Electrical Characteristics. It is not a no-load idle figure but a functional operating condition reflecting real-world standby behavior of the TPS627431YFPR.

Can the output voltage of TPS627431YFPR be changed dynamically during operation, and what are the timing constraints?

Yes, the TPS627431YFPR supports dynamic output voltage scaling: VSEL1–VSEL3 pins can be reconfigured while the device is enabled and regulating. Transition time between voltage settings is limited only by the external RC time constant of the VSEL lines and logic driver strength-no internal delay or lockout period applies. This capability is explicitly documented in Section 8.3.3 and Table 6-2, allowing real-time adaptation to MCU performance states without interrupting power delivery from the TPS627431YFPR.

Does TPS627431YFPR include short-circuit protection, and how does it behave under overload conditions?

Yes, the TPS627431YFPR integrates cycle-by-cycle current limiting on both high-side (650 mA typ) and low-side MOSFETs. Under sustained overload, it enters hiccup mode: after current limit trips, the device shuts down for ~10 ms, then attempts restart. This protects against thermal runaway and ensures safe operation into shorts or excessive capacitive loads. The protection mechanism is detailed in Section 8.3.6 and confirmed in the absolute maximum ratings table-no external components are needed for basic short-circuit robustness in the TPS627431YFPR.

What is the purpose of the VOS pin on TPS627431YFPR, and how should it be routed on the PCB?

On the TPS627431YFPR, the VOS pin serves two critical functions: it provides the feedback signal to the internal error amplifier for output voltage regulation, and it activates an internal discharge MOSFET to rapidly deplete VOUT when EN is pulled low. For optimal performance, VOS must be connected directly to the output capacitor's positive terminal using the shortest possible trace-no vias or stubs-to preserve loop stability and ensure accurate voltage sensing. This routing requirement is specified in Table 6-1 and Figure 9-2 of the TPS627431YFPR datasheet.