Texas Instruments TPS62621YFFT

Overview

TPS62621YFFT from Texas Instruments is a 6-MHz synchronous step-down DC/DC converter in NanoFree™ WCSP packaging, delivering 1.8 V at up to 600 mA from 2.3–5.5 V input. It features automatic PFM/PWM mode switching, 31 μA quiescent current, ±2% DC output accuracy, and integrated soft-start for mobile power rails.

For engineers reviewing the TPS62621YFFT datasheet, TPS62621YFFT pinout, TPS62621YFFT application, or TPS62621YFFT equivalent, key selection criteria include light-load efficiency, sub-1-mm footprint, fixed-frequency PWM forcing capability via MODE pin, and compatibility with 0402 ceramic capacitors and chip-scale inductors.

Technical Context

The TPS62621YFFT uses a frequency-locked ring-oscillating modulator architecture-eliminating traditional feedback compensation-enabling instantaneous transient response and inherent stability across L/COUT variations. Its non-linear control loop maintains regulated 6 MHz operation under moderate-to-heavy loads while transitioning seamlessly to discontinuous-conduction-mode (DCM) PFM at light loads.

It integrates dual MOSFETs (P-channel R_DS(on) = 350 mΩ @ 2.5 V, N-channel R_DS(on) = 200 mΩ @ 2.5 V), undervoltage lockout (2.05 V threshold), thermal shutdown (140°C), and active enable with 120-μs startup. The MODE pin selects between auto PFM/PWM or forced PWM; EN controls full shutdown with 0.2 μA typical I_SD.

Key Specifications

Pinout & Package

TPS62621YFFT is housed in a 6-pin NanoFree™ WCSP (DSBGA) package measuring 1.30 mm × 0.96 mm with 0.5-mm pitch. The ultra-thin profile (<0.4 mm) supports space-constrained mobile designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with TPS62621YFFT, TPS62067QDSGRQ1 adds automotive qualification but sacrifices 6-MHz speed and ultra-low IQ, while RT8059ZSP trades miniaturization and light-load performance for wider availability and simpler layout-neither offers identical combination of 6-MHz, 31 μA IQ, and 0.62 mm² footprint.

Availability

TPS62621YFFT is available at Aetrix Electronics and suitable for mobile phones, Bluetooth/WLAN modules, and DTV tuner applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production ramp.

Supply support for TPS62621YFFT 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 technologies, with decades of expertise in high-efficiency DC/DC conversion.

The TPS6262x product line was engineered specifically for ultra-compact, battery-powered portable electronics-prioritizing minimal solution size, exceptional light-load efficiency, and seamless PFM/PWM transition without external components.

FAQ

What is the recommended input capacitor for TPS62621YFFT?

A 2.2 μF, 6.3 V, X5R/X7R ceramic capacitor in 0402 case size is recommended per TI's typical application schematic. This value provides adequate high-frequency decoupling at the VIN pin, minimizes input ripple, and maintains stability across the 2.3–5.5 V input range. Larger values (e.g., 4.7 μF) may improve hold-up during transient load steps but are not required for basic operation. The TPS62621YFFT does not require bulk electrolytic capacitance due to its high 6-MHz switching frequency.

Does TPS62621YFFT support forced PWM mode, and how is it enabled?

Yes, TPS62621YFFT supports forced PWM mode via the MODE pin. Pulling MODE high (≥1.0 V) disables automatic PFM/PWM transition and locks the device into fixed-frequency 6-MHz PWM operation-even at light loads. This is essential for noise-sensitive applications like RF transceivers where variable-frequency PFM could interfere with signal integrity. The MODE pin must never be left floating and requires a defined logic level.

What is the maximum junction temperature and thermal shutdown behavior of TPS62621YFFT?

The TPS62621YFFT has a maximum operating junction temperature of 150°C and initiates thermal shutdown at approximately 140°C. Once triggered, the internal P- and N-channel MOSFETs turn off, halting switching. The device resumes normal operation only after the junction temperature falls below ~130°C due to 10°C hysteresis. Its 130°C/W junction-to-ambient thermal resistance (R_θJA) means proper PCB copper pour under the thermal pad is critical for sustained 600 mA operation.

Can TPS62621YFFT be used with a 0.47 μH inductor, and what is the impact on performance?

Yes, TPS62621YFFT is optimized for 0.47 μH inductors per TI's internal compensation design. Using this value yields best-in-class transient response, stable operation with 4.7 μF output capacitance, and minimal output voltage ripple. Deviations outside 0.3–1.3 μH may degrade loop stability or increase ripple. A 0.47 μH inductor also enables the smallest practical solution size-consistent with the sub-12 mm² total footprint target specified for the TPS62621YFFT.

Is there an output capacitor discharge function in TPS62621YFFT?

No, TPS62621YFFT does not include active output capacitor discharge. That feature is exclusive to the TPS62624 variant (1.2 V output with integrated 15 Ω discharge resistor). TPS62621YFFT relies on natural discharge through the load or external circuitry. Designers requiring fast VOUT decay during shutdown must add an external MOSFET-based discharge path or select TPS62624 if 1.2 V output is acceptable.