Texas Instruments TPS61256AYFFR

Overview

TPS61256AYFFR from Texas Instruments is a synchronous step-up DC-DC converter IC delivering a fixed 5.0 V output at up to 800 mA from input voltages as low as 2.7 V, operating at 3.5 MHz with 93% peak efficiency and 36 µA quiescent current in PFM mode - used for powering USB peripherals, camera modules, and audio amplifiers in space-constrained portable devices.

For engineers reviewing the TPS61256AYFFR datasheet, TPS61256AYFFR pinout, TPS61256AYFFR application, or TPS61256AYFFR equivalent, key selection criteria include its 2.5–4.85 V input range, ±2% DC output accuracy, true load disconnect during shutdown, thermal regulation at ~110°C, and NanoFree™ 9-bump DSBGA (YFF) package enabling sub-35 mm² total solution size.

Technical Context

The TPS61256AYFFR employs valley-current-mode control with adaptive slope compensation and quasi-constant on-time PWM operation above ~10 mA load, transitioning to PFM mode below that threshold to maintain high light-load efficiency. Its internal soft-start limits inrush current via pre-charge (≈200 mA current-limited rectifier phase), followed by progressive on-time ramping based on VIN/VOUT ratio.

It integrates dual N-MOSFET power switches (170 mΩ high-side, 100 mΩ low-side), undervoltage lockout (2.0 V trip, 100 mV hysteresis), thermal regulation (~110°C activation), and thermal shutdown (140°C typical). True load disconnect is achieved by fully isolating VIN from VOUT when EN is low, with reverse current protection and <5 µA shutdown current.

Key Specifications

Pinout & Package

NanoFree™ 9-bump DSBGA (YFF) package, 1.206 mm × 1.306 mm body size, bottom-side solder bumps - optimized for ultra-compact layouts and thermal performance via direct die-to-PCB conduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61256AYFFR, TPS61252YFFR offers identical integration and footprint but reduced current capability, while MT9700-5.0TR trades miniaturization for higher output current and thermal robustness - making TPS61256AYFFR optimal for space-constrained 800 mA applications where efficiency and shutdown leakage are critical.

Availability

TPS61256AYFFR is available at Aetrix Electronics and suitable for smartphone camera modules, USB OTG power supplies, and portable audio amplifiers requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for TPS61256AYFFR 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 for portable electronics.

The TPS61256AYFFR belongs to TI's NanoFree™ boost converter family, designed specifically for ultra-compact, battery-powered applications where minimal solution size, low quiescent current, and true load disconnect are mandatory.

FAQ

What is the maximum continuous output current of the TPS61256AYFFR?

The TPS61256AYFFR delivers up to 800 mA continuously at 5.0 V output when input voltage is ≥3.3 V. At lower input voltages (e.g., 2.7 V), maximum output current decreases per the device's power limit - verified in the "Maximum Output Current vs Input Voltage" characteristic curve (Figure 6) of the official datasheet.

Does the TPS61256AYFFR support true load disconnect during shutdown?

Yes, the TPS61256AYFFR provides true load disconnect: when EN is pulled low, internal switches isolate VIN from VOUT, resulting in <5 µA shutdown current and zero reverse current flow - confirmed in Section 8.7.4 and Electrical Characteristics Table (ISD parameter).

What external components are required for basic operation of the TPS61256AYFFR?

The TPS61256AYFFR requires only three external components: a 1.0 µH inductor (e.g., TOKO DFE322512C-1R0N), a 10 µF input ceramic capacitor, and a 22 µF output ceramic capacitor - validated in the Typical Application schematic (Figure 14) and Section 9.2.1 of the datasheet.

What is the switching frequency of the TPS61256AYFFR and how does it affect design?

The TPS61256AYFFR operates at a regulated 3.5 MHz switching frequency. This high frequency enables use of miniature passive components (e.g., 1.0 µH inductor, 0603/1210 caps), reduces output ripple, and minimizes EMI filter requirements - all contributing to its <35 mm² total solution size.

How does the TPS61256AYFFR manage efficiency at light loads?

The TPS61256AYFFR automatically enters power-save mode (PFM) at light loads (<10 mA), reducing quiescent current to 36 µA typical. It resumes PWM operation when load increases, maintaining >85% efficiency down to 0.1 mA - documented in Figure 1 (Efficiency vs Output Current) and Section 8.7.1.