Texas Instruments TPS627431YFPT

Overview

TPS627431YFPT from Texas Instruments is a 400 mA ultra-low-quiescent-current buck converter optimized for coin-cell-powered wearable and IoT devices. It operates from 2.15 V to 5.5 V input, delivers selectable output voltages (1.3 V–3.1 V), achieves 360 nA operating IQ, and enters no-ripple 100% mode when VIN approaches VOUT - enabling direct operation from a single Li-MnO₂ cell.

For engineers reviewing the TPS627431YFPT datasheet, TPS627431YFPT pinout, TPS627431YFPT application, or TPS627431YFPT equivalent, key selection criteria include its DCS-Control™ topology for RF-friendly light-load efficiency, 8-pin DSBGA (1.57 mm × 0.88 mm) package constraints, voltage-selection pin mapping, and verified 400 mA output capability under 2.0 V–5.5 V input conditions.

Technical Context

The TPS627431YFPT implements TI's DCS-Control™ topology with dual-loop regulation: an AC loop sensing VOS for fast transient response and a DC feedback loop for precise load regulation. It operates at ~1.2 MHz in PWM mode and seamlessly transitions to PFM-based Power Save Mode below ~10 µA load, sustaining >90% efficiency at 10 µA.

Its functional architecture integrates undervoltage lockout (UVLO: 2.075 V rise / 1.925 V fall), cycle-by-cycle current limiting on both high-side (650 mA typ) and low-side MOSFETs, automatic output discharge via VOS, and hysteresis-controlled 100% mode entry/exit thresholds (VTH_100− = 85–200 mV, VTH_100+ = 150–350 mV).

Key Specifications

Pinout & Package

TPS627431YFPT uses an 8-ball DSBGA (YFP) package measuring 1.57 mm × 0.88 mm with 0.4-mm ball pitch. The package is bottom-side soldered and requires controlled thermal profile for reliable assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62743YFPT, the TPS627431YFPT provides +100 mA output and narrower VOUT options optimized for BLE SoCs; compared with TPS62840DLCR, it trades 1.04 µA higher IQ for 10× lower quiescent consumption - critical for decade-long deployments.

Availability

TPS627431YFPT is available at Aetrix Electronics and suitable for wearable health monitors, fitness trackers, smartwatches, and energy-harvesting sensor nodes requiring stable component supply across long-lifecycle consumer electronics programs.

Supply support for TPS627431YFPT 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 silicon design.

The TPS627431YFPT belongs to TI's ultra-low-power DC/DC converter product line, engineered specifically for battery-constrained IoT edge devices where multi-year operation from primary cells is mandatory.

FAQ

What is the minimum input voltage required for TPS627431YFPT to start up and operate continuously?

The TPS627431YFPT requires a minimum input voltage of 2.15 V to initiate startup (UVLO rising threshold). Once enabled, it continues operating down to 2.0 V - enabling full utilization of a CR2032 coin cell from fresh (3.0 V) to fully depleted (2.0 V). This behavior is confirmed in Section 7.3 of the SLVSCQ0B datasheet and validated across –40°C to 85°C.

How does the TPS627431YFPT achieve 360 nA quiescent current while maintaining regulation accuracy?

The TPS627431YFPT achieves 360 nA IQ through an ultra-low-power voltage reference, high-impedance internal feedback divider (typical 50 MΩ), and aggressive circuit shutdown during Power Save Mode sleep cycles. Regulation accuracy remains ±2.5% over load and temperature because the error amplifier and comparator remain active only during brief PFM pulses - preserving DC precision without continuous bias current.

Can the output voltage of TPS627431YFPT be changed dynamically during operation, and what are the timing constraints?

Yes, the TPS627431YFPT supports dynamic VOUT reconfiguration via VSEL1–VSEL3 pins during normal operation. No sequencing or reset is required. Transition occurs within one switching cycle (~830 ns at 1.2 MHz), and output settles to new value within 20 µs. This capability is explicitly documented in Section 8.3.3 and Table 6-2 of the datasheet.

What is the purpose of the VOS pin on the TPS627431YFPT, and how must it be connected?

The VOS pin serves dual functions: (1) feedback node for the internal regulation loop, and (2) discharge path for VOUT when EN = low. It must be connected directly to the output capacitor with the shortest possible trace - no series resistance or filtering - to ensure accurate voltage sensing and rapid discharge (RDSCH_VOS = 30–65 Ω). This connection is mandatory per Section 6.1 and Figure 9-2.

Does the TPS627431YFPT include short-circuit protection, and how does it behave under overload?

Yes, the TPS627431YFPT integrates cycle-by-cycle current limiting on both high-side (650 mA typ) and low-side MOSFETs. Under sustained overload, it enters hiccup mode: shuts down for ~10 ms, then attempts restart. During transient overloads, it limits peak inductor current to prevent thermal runaway while maintaining regulation - verified in Section 8.3.6 and Figure 8-1.