Texas Instruments TPS61094DSSR

Overview

TPS61094DSSR from Texas Instruments is a 60-nA quiescent current synchronous bidirectional buck/boost converter with integrated bypass switch and supercapacitor management. It operates from 0.7 V to 5.5 V input, delivers programmable boost output (2.7–5.4 V), supports programmable buck charging (1.7–5.4 V termination, 2.5–600 mA current), and uses two internal MOSFETs (60 mΩ LS / 140 mΩ HS) in a 2 mm × 3 mm WSON-12 package for smart meter backup power systems.

For engineers reviewing the TPS61094DSSR datasheet, TPS61094DSSR pinout, TPS61094DSSR application, or TPS61094DSSR equivalent, key selection criteria include ultra-low IQ in boost/buck modes (60 nA), forced bypass mode IQ (4 nA), 1-MHz switching frequency, 2.0-A valley current limit, and dual-mode supercap charging/regulation capability in energy-constrained utility metering and portable medical devices.

Technical Context

The TPS61094DSSR implements a synchronous bidirectional architecture with automatic mode transition between buck charging and boost regulation based on VIN vs. VOUT_TARGET comparison. Its four operation modes-auto buck/boost, forced buck, forced bypass, and true shutdown-are controlled jointly by EN and MODE pins with internal 800-kΩ pulldown resistors.

It integrates dedicated sensing and control for supercapacitor management: VCHG and ICHG pins configure 16-step termination voltage and charging current via external resistors; OSEL configures 16-step boost output voltage. The device features undervoltage lockout (VIN UVLO rising threshold = 1.7 V), thermal shutdown (150 °C), short-circuit protection, and auto-snooze light-load operation.

Key Specifications

Pinout & Package

The TPS61094DSSR is housed in a thermally enhanced 2.0 mm × 3.0 mm, 12-pin WSON package (DSS suffix) with exposed thermal pad. Pin 1 is marked by a dot; top view orientation follows JEDEC MO-229 standard.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional supercapacitor power management applications.

Compared with MAX17222ELT+T and TPS61099YFFR, the TPS61094DSSR uniquely integrates bidirectional supercap management, programmable charging, and ultra-low IQ across all modes-enabling single-chip backup power solutions where runtime, reliability, and component count are critical.

Availability

TPS61094DSSR is available at Aetrix Electronics and suitable for smart utility metering, portable medical monitoring, energy-harvesting IoT endpoints, and industrial sensor transmitters requiring stable component supply and long-term lifecycle support.

Supply support for TPS61094DSSR 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TPS61094 product line was designed specifically for ultra-low-power backup power systems requiring seamless bidirectional energy transfer between primary sources and supercapacitors in metering and safety-critical edge devices.

FAQ

What is the minimum input voltage required for TPS61094DSSR to start up?

The TPS61094DSSR requires a minimum input voltage of 1.8 V at the VIN pin to initiate startup. Once operational, it can regulate down to 0.7 V input in boost mode. This 1.8-V startup threshold ensures reliable initialization from partially discharged batteries or low-energy harvesters while maintaining system stability during brownout conditions. The TPS61094DSSR's undervoltage lockout (UVLO) rising threshold is typically 1.7 V, with hysteresis to prevent oscillation near the threshold.

How does the TPS61094DSSR manage supercapacitor charging termination?

The TPS61094DSSR uses the VCHG pin to set supercapacitor charging termination voltage via a resistor-to-ground, supporting 16 discrete values from 1.7 V to 5.4 V with ±2% accuracy. When the SUP pin voltage reaches the programmed VCHG level, charging stops; if SUP drops 75 mV below VCHG, charging resumes. This hysteresis prevents rapid cycling and extends supercap lifetime. The TPS61094DSSR performs this regulation autonomously without host MCU intervention.

Can the TPS61094DSSR operate in both boost and buck modes simultaneously?

No, the TPS61094DSSR cannot operate in boost and buck modes simultaneously. In Auto buck/boost mode (EN=1, MODE=1), it dynamically transitions between modes: buck charging occurs when VIN exceeds VOUT_TARGET + 100 mV, while boost regulation activates when VIN falls below VOUT_TARGET. The device never conducts both paths concurrently-ensuring efficient unidirectional energy flow and preventing shoot-through or cross-conduction losses in the TPS61094DSSR power stage.

What is the purpose of the OSEL, VCHG, and ICHG pins on the TPS61094DSSR?

The OSEL, VCHG, and ICHG pins on the TPS61094DSSR are resistor-programmable configuration inputs that set boost output voltage (OSEL), supercap charging termination voltage (VCHG), and charging current (ICHG), respectively-each offering 16 discrete options. These pins are sampled once at startup and latched; resistor values must be ≤1% tolerance with <10 pF parasitic capacitance. Changing resistors during operation has no effect unless EN is toggled to reinitialize the TPS61094DSSR and reload settings.

Does the TPS61094DSSR support true load disconnect in shutdown mode?

Yes, the TPS61094DSSR supports true load disconnect in True Shutdown mode (EN=0, MODE=1), where both the input-to-output bypass switch and high-side FET are fully turned off. This isolates the load from VIN and SUP pins, reducing leakage to ≤550 nA into VIN and ≤250 nA into SUP. Unlike forced bypass or auto modes, True Shutdown guarantees zero DC path between input sources and the output rail-critical for safety-critical or zero-power-storage applications using the TPS61094DSSR.