Texas Instruments TPS63805YFFR

Overview

TPS63805YFFR from Texas Instruments is a high-efficiency, low-quiescent-current buck-boost DC/DC converter in a 3×5-ball WCSP package (2.3 mm × 1.4 mm), operating from 1.3 V to 5.5 V input and delivering adjustable 1.8 V–5.2 V output. It delivers up to 2 A at VI ≥ 2.3 V / VO = 3.3 V, features 11 µA IQ, seamless buck/buck-boost/boost mode transitions, and is optimized for smallest solution size (18.5 mm²) using only a 22-µF minimum output capacitor - ideal for space-constrained portable power rails.

For engineers reviewing the TPS63805YFFR datasheet, TPS63805YFFR pinout, TPS63805YFFR application, or TPS63805YFFR equivalent, key selection considerations include its ultra-low IQ for battery longevity, pre-biased start-up capability, true shutdown with load disconnect, integrated soft-start (224 µs Tramp), and robust protection suite including overtemperature, overvoltage, and forward/reverse current limiting.

Technical Context

The TPS63805YFFR employs a peak-current-mode control architecture with four internal synchronous switches, enabling automatic, ripple-minimized transitions between buck, buck-boost (3-cycle), and boost modes based on real-time VIN–VOUT relationship. Its dual-loop design uses a 500-mV internal reference and error amplifier to generate a current demand signal that drives the inner current comparator.

It supports both PFM (power-save) and forced-PWM operation via the MODE pin, includes precise EN thresholding (1.1 V typ.) for RC-delayed enable or undervoltage monitoring, and implements reverse-current capability with dedicated negative current limit (–0.9 A) and input overvoltage protection (IVP) to prevent VIN rise during reverse energy transfer.

Key Specifications

Pinout & Package

TPS63805YFFR is housed in a 3×5-ball, 0.4-mm-pitch wafer-chip-scale package (WCSP) measuring 2.3 mm × 1.4 mm, designed for ultra-dense PCB layouts and compatible with standard reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS63807YFFR, TPS63805YFFR saves 256 µs in soft-start time and omits output discharge - making it preferable for rapid-response systems. Against TPS63020DSJR, TPS63805YFFR delivers 14 µA lower IQ, 3% higher efficiency, and 40% smaller solution size, justifying its use in modern portable electronics.

Availability

TPS63805YFFR is available at Aetrix Electronics and suitable for smartphone power management, IoT sensor nodes, and telematics module design requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS63805YFFR 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 TPS6380x family was designed specifically for ultra-compact, high-efficiency buck-boost regulation in battery-powered portable electronics - prioritizing minimal solution size, ultra-low quiescent current, and seamless mode transitions.

FAQ

What is the minimum input voltage required for TPS63805YFFR to start up?

The TPS63805YFFR requires an input voltage greater than 1.8 V to initiate start-up, even though its absolute operating range extends down to 1.3 V. Once started, it continues regulating down to 1.3 V. This UVLO rising threshold ensures reliable initialization and avoids unstable operation during battery brownout conditions. The TPS63805YFFR datasheet specifies 1.6–1.79 V as the nominal rising UVLO threshold.

Does TPS63805YFFR support reverse current flow from output to input?

Yes, the TPS63805YFFR supports controlled reverse current operation with a peak limit of –0.9 A when VIN = 5 V and VOUT = 3.3 V. This capability enables bidirectional energy transfer in applications like USB OTG or battery backup systems. However, if the input source cannot sink reverse current, the device activates input overvoltage protection (IVP) to halt reverse operation and prevent VIN from rising above 5.7 V.

Can TPS63805YFFR start up into a pre-biased output capacitor?

Yes, the TPS63805YFFR supports start-up into a pre-biased output, meaning it can safely begin regulation even when the VOUT node is already charged to a voltage within its output range. This feature prevents inrush current conflicts and output voltage overshoot in multi-rail systems or hot-plug scenarios. The TPS63805YFFR achieves this through internal control logic that monitors and manages the initial switch timing relative to the existing VOUT level.

What is the recommended output capacitor value for TPS63805YFFR at 3.3-V output?

For a 3.3-V output, the TPS63805YFFR requires a minimum effective output capacitance of 7 µF (for VO > 2.3 V). A 22-µF ceramic capacitor is commonly used to meet this requirement while ensuring stability and low AC impedance. The TPS63805YFFR datasheet confirms that 22 µF is the minimum value enabling its smallest 18.5-mm² solution size, and recommends X5R/X7R dielectrics with ≤100 mΩ ESR.

How does the MODE pin affect efficiency and output ripple in TPS63805YFFR?

When the MODE pin is pulled LOW, the TPS63805YFFR operates in power-save mode (PFM), skipping switching pulses at light loads to achieve ultra-high efficiency (e.g., >85% at 100 µA). When MODE is HIGH, it forces continuous PWM operation, delivering constant frequency and lowest possible output ripple - essential for noise-sensitive analog or RF circuits. The TPS63805YFFR's 11-µA quiescent current is specified in PFM mode.