Texas Instruments TPS61097-33DBVT

Overview

TPS61097-33DBVT from Texas Instruments is a fixed-output 3.3 V synchronous boost converter optimized for ultra-low-input-voltage battery-powered systems, featuring 0.9 V to 5.5 V input range, <5 μA quiescent current, <5 nA shutdown current, and 5-pin SOT-23 (DBV) package - deployed in MSP430-based portable medical devices and single-cell Li-ion energy harvesting systems.

For engineers reviewing the TPS61097-33DBVT datasheet, TPS61097-33DBVT pinout, TPS61097-33DBVT application, or TPS61097-33DBVT equivalent, key selection criteria include minimum startup voltage (0.9 V), bypass-switch functionality during shutdown, synchronous rectification efficiency (>95% at 10 mA), thermal shutdown (150 °C), and compatibility with ceramic output capacitors ≥10 μF.

Technical Context

The TPS61097-33DBVT implements a hysteretic current-mode control architecture with synchronous rectification using dual internal MOSFETs - main switch and rectifying switch - enabling stable operation without external compensation. Its bypass switch (P-channel) connects VIN directly to VOUT when EN is low, supporting battery backup of critical loads.

Startup begins via an internal oscillator below ~1.8 V input, transitioning to hysteretic mode once control circuitry is self-powered; undervoltage lockout (0.5–0.7 V) disables regulation but leaves bypass active, and overtemperature protection (150 °C, 20 °C hysteresis) ensures safe thermal recovery.

Key Specifications

Pinout & Package

5-pin SOT-23 (DBV) package with exposed pad not electrically connected; footprint matches JEDEC MO-178AB standard; thermal resistance θJA = 255 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61097-33DBVT, the TPS61097A-33DBVT offers tighter regulation and lower shutdown current but requires validation of UVLO interaction with weak input sources; the MAX17222ETA+T saves board space but sacrifices bypass functionality and minimum input voltage support.

Availability

TPS61097-33DBVT is available at Aetrix Electronics and suitable for portable medical devices, energy-harvesting sensors, and MSP430-based embedded systems requiring stable component supply across long product lifecycles.

Supply support for TPS61097-33DBVT 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 TPS61097 family was designed specifically for ultra-low-voltage battery-powered applications - including medical wearables, fuel cells, and solar harvesters - where extended runtime and deep discharge utilization are critical.

FAQ

What is the minimum input voltage required for TPS61097-33DBVT to start switching?

The TPS61097-33DBVT begins startup operation at 0.9 V input voltage. Below ~1.8 V, it uses an internal oscillator to drive the switches until the output reaches sufficient voltage to power the control circuitry; this enables full utilization of single-cell alkaline or NiMH batteries down to end-of-discharge voltage. The TPS61097-33DBVT maintains regulation across the full 0.9–5.5 V input range.

Does TPS61097-33DBVT include a bypass function, and how does it operate?

Yes, the TPS61097-33DBVT integrates a P-channel bypass switch that activates automatically when the EN pin is driven low. In shutdown mode, this switch connects VIN directly to VOUT with <3.4 Ω on-resistance, providing uninterrupted power to critical downstream circuitry - such as real-time clocks or memory retention circuits - without regulator losses. The TPS61097-33DBVT bypass operates independently of UVLO, overvoltage, or thermal events.

What output capacitor value is recommended for stable operation of TPS61097-33DBVT?

A minimum 10 μF ceramic capacitor (X5R/X7R dielectric, 6.3–10 V rating) is recommended for the output of the TPS61097-33DBVT, placed as close as possible to the VOUT and GND pins. Murata GRM319R61A106KE19 is a validated part. Using ≥10 μF ensures low output ripple (<20 mVpp), adequate transient response, and stability across temperature and load variations. The TPS61097-33DBVT is not ESR-sensitive but benefits from low-ESR ceramics.

Can TPS61097-33DBVT be used with input voltages higher than 3.3 V?

Yes - the TPS61097-33DBVT accepts input voltages up to 5.5 V. When VIN exceeds VOUT (3.3 V), the device enters pass-through mode: the main switch remains off, and the synchronous rectifier's body diode conducts, causing VOUT to track VIN minus forward voltage drop (~0.3–0.4 V). This behavior is documented in the datasheet and applies to the TPS61097-33DBVT without risk of damage or regulation loss.

Is TPS61097-33DBVT suitable for new designs, or is it obsolete?

The TPS61097-33DBVT is marked "Not Recommended for New Designs" per TI's official documentation, with the TPS61097A-33DBVT designated as the preferred replacement. However, the TPS61097-33DBVT remains in active production (status: ACTIVE per TI's Package Option Addendum), fully supported for legacy design refreshes, repair, and cost-sensitive volume applications where its ±3% output tolerance and established qualification meet requirements.