Texas Instruments TPS62746YFPT

Overview

TPS62746YFPT from Texas Instruments is a high-efficiency, ultra-low-quiescent-current buck converter optimized for single Li-MnO₂ coin-cell operation. It delivers 300 mA output current with 360 nA operating IQ, supports dual selectable output voltages (1.2 V and 1.8 V), and integrates a 1-mA/150-Ω VIN switch for ADC-based input voltage monitoring in wearable health monitors.

For engineers reviewing the TPS62746YFPT datasheet, TPS62746YFPT pinout, TPS62746YFPT application, or TPS62746YFPT equivalent, key selection criteria include sub-µA light-load efficiency, automatic no-ripple 100% mode transition at VIN–VOUT < 200 mV, DCS-Control™ topology for RF-friendly transient response, and WCSP package compatibility with space-constrained PCB layouts.

Technical Context

The TPS62746YFPT implements TI's DCS-Control™ topology with quasi-fixed 1.2 MHz switching frequency, enabling seamless PWM-to-PFM transition and excellent AC load regulation. Its integrated high-impedance feedback divider eliminates external resistors while supporting dynamic VSEL-driven voltage scaling between 1.2 V and 1.8 V.

It features dual-stage protection: cycle-by-cycle current limiting on both high-side (480–720 mA) and low-side MOSFETs, plus undervoltage lockout with 2.15 V turn-on and 2.0 V shutdown thresholds. The dedicated CTRL-controlled VIN switch operates independently of EN and remains functional down to UVLO threshold.

Key Specifications

Pinout & Package

TPS62746YFPT uses an 8-ball DSBGA (WCSP) package with nominal body size 1.6 mm × 0.9 mm, optimized for minimal PCB area in wearables and hearables.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62746YFPT, TPS62743YFPT trades voltage flexibility for higher current, while MAX17222ELT+T achieves lower quiescent current but sacrifices integration-requiring external resistors, switches, and dropout management circuitry.

Availability

TPS62746YFPT is available at Aetrix Electronics and suitable for wearable fitness trackers, medical patch monitors, and energy-harvesting sensor nodes requiring stable component supply across long production lifecycles.

Supply support for TPS62746YFPT 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 leadership in high-efficiency DC/DC conversion.

The TPS62746YFPT belongs to TI's ultra-low-power buck converter product line, designed specifically for battery-operated IoT endpoints where multi-year operation from coin cells is mandatory.

FAQ

What is the minimum input voltage required for TPS62746YFPT startup?

The TPS62746YFPT requires a minimum input voltage of 2.15 V to initiate startup due to its undervoltage lockout (UVLO) rising threshold. Once operational, it continues regulating down to 2.0 V. This allows full utilization of a CR2032 coin cell's discharge curve, extending usable battery capacity by approximately 15% compared to regulators with higher UVLO thresholds.

How does the TPS62746YFPT achieve 90% efficiency at only 10 µA output current?

The TPS62746YFPT achieves 90% efficiency at 10 µA through its Power Save Mode, which transitions to pulse-frequency modulation (PFM) with ultra-low-bias circuits, an integrated high-impedance feedback divider, and an ultra-low-power voltage reference. These features reduce operating current to 360 nA while maintaining regulation-enabling multi-year battery life in intermittently active devices.

Can the output voltage of TPS62746YFPT be changed dynamically during operation?

Yes, the TPS62746YFPT supports real-time output voltage switching between 1.2 V and 1.8 V via the VSEL pin. The pin must be actively driven high or low-floating is not permitted-and the transition occurs within one switching cycle. This enables dynamic voltage scaling for MCU core voltage adjustment during different activity states without requiring a power cycle.

What is the function of the VINSW pin on the TPS62746YFPT, and how is it controlled?

The VINSW pin on the TPS62746YFPT is the output of an integrated 1-mA, 150-Ω MOSFET switch connecting VIN to VINSW. It is controlled by the CTRL pin: when CTRL is high, the switch closes; when CTRL is low or floating (internally pulled to GND), the switch opens. This allows precise, low-leakage battery voltage sampling via an external resistor divider and MCU ADC without adding discrete components.

Does the TPS62746YFPT provide automatic output discharge, and how is it implemented?

Yes, the TPS62746YFPT provides automatic output voltage discharge via the VOS pin. When EN is pulled low or UVLO triggers, an internal MOSFET connects VOUT to GND through VOS, discharging the output capacitor. This ensures VOUT starts from 0 V at next enable-critical for deterministic power-on reset behavior in MCUs and analog sensors, eliminating need for external discharge circuitry.