Texas Instruments TPS61256CYFFR

Overview

TPS61256CYFFR from Texas Instruments is a 3.5-MHz synchronous step-up DC-DC converter in 9-pin NanoFree™ DSBGA packaging, delivering up to 800 mA at fixed 5.0 V output from input voltages as low as 2.3 V. It features ±2% DC voltage accuracy, 93% peak efficiency, and 37-µA quiescent current in PFM mode-designed for NFC PA supply and compact USB charging ports.

For engineers reviewing the TPS61256CYFFR datasheet, TPS61256CYFFR pinout, TPS61256CYFFR application, or TPS61256CYFFR equivalent, key selection criteria include its pass-through mode operation (EN = low), 2.3–5.5 V input range, thermal shutdown at 140°C, valley-current limit of 2150 mA (typ), and minimal external component count (only three SMD parts required).

Technical Context

The TPS61256CYFFR employs quasi-constant on-time valley-current-mode control with adaptive slope compensation, enabling stable regulation across wide VIN/VOUT ratios and fast transient response without external compensation. Its architecture supports seamless transition between PWM (3.5 MHz fixed) and PFM light-load modes.

It integrates dual MOSFET power switches (170 mΩ high-side, 100 mΩ low-side), undervoltage lockout (2.1 V threshold with 100 mV hysteresis), and thermal regulation that reduces current above ~110°C before full shutdown at 140°C. Pass-through mode activates when EN is pulled low, allowing VOUT to follow VIN minus IR drops across the inductor and HS FET.

Key Specifications

Pinout & Package

TPS61256CYFFR uses a 9-bump DSBGA (NanoFree™) package measuring 1.206 mm × 1.306 mm with 0.4-mm pitch. The package is bottom-terminal only, requiring microvia or solder-mask-defined pads per TI layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61256CYFFR, TPS61252YFFR offers identical form factor but targets 3.3 V systems, while MT9700-5.0 trades pass-through mode and thermal regulation for slightly higher current rating - making TPS61256CYFFR optimal for space-constrained, thermally sensitive 5 V NFC and USB applications.

Availability

TPS61256CYFFR is available at Aetrix Electronics and suitable for NFC PA supply, smartphone audio subsystems, and compact USB charging ports requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS61256CYFFR 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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.

The TPS61256xC family was engineered specifically for ultra-compact, high-efficiency boost conversion in battery-powered mobile devices - prioritizing minimal solution size, low quiescent current, and seamless pass-through operation.

FAQ

What is the maximum continuous output current of the TPS61256CYFFR in boost mode?

The TPS61256CYFFR delivers up to 800 mA continuous output current in boost mode when operating within recommended conditions (VIN ≥ 2.5 V, TA ≤ 85°C, proper thermal layout). This rating assumes use of a 1.0-µH inductor and adequate PCB copper area for heat dissipation. At lower input voltages or elevated temperatures, derating applies per the thermal metrics table (RθJA = 108.3°C/W).

Does the TPS61256CYFFR support pass-through mode, and how is it activated?

Yes, the TPS61256CYFFR supports pass-through mode when the EN pin is pulled low while VIN remains above the UVLO threshold (2.1 V). In this mode, the output follows the input voltage minus IR drops across the inductor DCR and high-side FET rDS(on), enabling zero-switching-loss operation when VIN ≥ VOUT. The device limits pass-through current to 500 mA minimum, as confirmed in the Electrical Characteristics table.

What package type and dimensions does the TPS61256CYFFR use?

The TPS61256CYFFR uses a 9-bump DSBGA (NanoFree™) package with nominal body size 1.206 mm × 1.306 mm and 0.4-mm bump pitch. This ultra-compact chip-scale package is specified in TI's orderable addendum and requires microvia or solder-mask-defined land patterns per SLVSDQ1A layout guidelines. No leaded or QFN variants exist for this part number.

Can the TPS61256CYFFR operate from a 2.3-V input and still regulate 5.0 V output?

Yes, the TPS61256CYFFR is fully specified to operate from 2.3 V input and deliver regulated 5.0 V output at up to 800 mA, as validated in Figure 2 (DC Output Voltage vs Output Current) and Table 5 (Electrical Characteristics). At 2.3 V input, efficiency drops to ~78% at 100 mA load, but regulation remains within ±2% due to its valley-current-mode control and internal compensation.

What is the typical quiescent current of the TPS61256CYFFR in light-load PFM mode?

The typical quiescent current of the TPS61256CYFFR in light-load PFM mode is 37 µA, measured at VIN = 3.6 V, IOUT = 0 mA, and TA = 25°C. This value is explicitly listed in the "Supply Current" section of the Electrical Characteristics table (IQ = 30–45 µA min–max). In pass-through mode (EN = GND), quiescent current drops further to 11–20 µA.