Texas Instruments TPS62748YFPT

Overview

TPS62748YFPT from Texas Instruments is a high-efficiency, ultra-low-quiescent-current buck converter with integrated 100-mA load switch, delivering 300 mA output current at 1.2 V or 1.8 V selectable via VSEL pin, operating from 2.15–5.5 V input (down to 2.0 V after startup), and achieving 360 nA quiescent current - optimized for coin-cell-powered wearables and Bluetooth LE sensors.

For engineers reviewing the TPS62748YFPT datasheet, TPS62748YFPT pinout, TPS62748YFPT application, or TPS62748YFPT equivalent, key selection considerations include its DCS-Control™ topology enabling seamless PWM-to-PSM transition, automatic no-ripple 100% mode below VIN–VOUT < 200 mV, RF-friendly operation, and compact 1.6 mm × 0.9 mm WCSP package with verified 8-ball DSBGA layout.

Technical Context

The TPS62748YFPT implements TI's DCS-Control™ topology, combining fast AC transient response with stable DC regulation using an internal high-impedance feedback divider and ultra-low-power reference. It operates at a typical 1.2 MHz switching frequency in PWM mode and transitions seamlessly to PFM-based Power Save Mode below ~10 µA load, sustaining >90% efficiency at 10 µA.

Its functional architecture integrates two independent power paths: a synchronous buck regulator with auto 100% duty-cycle mode (enabled when VIN–VOUT falls below VTH_100− ≈ 200 mV) and a separately controlled 100-mA load switch (R_ON = 0.6 Ω typ at 1.8 V) between VOS and LOAD, activated by the CTRL pin with internal soft-start and discharge capability.

Key Specifications

Pinout & Package

TPS62748YFPT uses an 8-ball DSBGA (WCSP) package with 0.4-mm pitch, nominal body size 1.6 mm × 0.9 mm, and bottom-side solder ball termination. Thermal performance includes R_θJA = 103 °C/W and R_θJB = 20 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62748YFPT, TPS62746YFPT offers +100 mA output headroom with identical footprint and IQ, while TPS62840DLCR trades away the integrated load switch and programmable VSEL for lower IQ and higher current - making TPS62748YFPT optimal for cost- and space-sensitive dual-rail wearable designs requiring built-in power gating.

Availability

TPS62748YFPT is available at Aetrix Electronics and suitable for wearable electronics, medical biosensors, and Bluetooth LE modules requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing for FDA-registered devices.

Supply support for TPS62748YFPT 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 ultra-low-power design for portable and medical electronics.

The TPS627xx family was engineered specifically for energy-constrained, battery-operated IoT endpoints - prioritizing nanoscale IQ, minimal solution size, and robust RF coexistence in compact wearable and sensor platforms.

FAQ

What is the minimum input voltage required for TPS62748YFPT startup?

The TPS62748YFPT 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 - enabling uninterrupted function as a CR2032 coin cell discharges from 3.0 V to 2.0 V. This two-threshold UVLO behavior is confirmed in Section 7.3 of the SLVSD37B datasheet.

Does TPS62748YFPT support dynamic output voltage scaling during operation?

Yes, TPS62748YFPT supports real-time output voltage scaling: the VSEL pin accepts a logic-level input that dynamically selects between 1.2 V (VSEL = low) and 1.8 V (VSEL = high) while the device is enabled. This capability is explicitly documented in Table 6-2 and Section 8.3.4 of the datasheet, enabling firmware-controlled power optimization in multi-mode sensors.

How does the integrated load switch in TPS62748YFPT behave when disabled?

When CTRL = low, the TPS62748YFPT load switch turns off and actively discharges the LOAD pin to GND through an internal ~30-Ω path (R_DCHRG). This ensures the downstream circuit is fully de-energized and prevents floating nodes or unintended leakage paths - a feature verified in Section 7.5 (Electrical Characteristics) and Section 8.3.3 of the SLVSD37B datasheet.

What is the purpose of the VOS pin on TPS62748YFPT beyond feedback sensing?

Beyond serving as the feedback node for output regulation, the VOS pin on TPS62748YFPT provides automatic output voltage discharge: when EN is pulled low or UVLO triggers, an internal MOSFET connects VOS to GND, rapidly discharging C_OUT. This guarantees VOUT ramps from 0 V at next enable - critical for reliable power sequencing in systems with multiple rails, as confirmed in Section 8.3.5 and Figure 8-1 of the datasheet.

Can TPS62748YFPT operate without an external inductor?

No, TPS62748YFPT requires an external 2.2-µH inductor connected between SW and VOUT - it is a synchronous buck converter, not a charge pump or LDO. The inductor is fundamental to energy transfer and ripple control; omission would prevent regulation. The datasheet specifies DFE201610C (Toko) and equivalent 2.2-µH shielded inductors in Table 9-3 and Figure 9-1, confirming mandatory external magnetics.