Texas Instruments TPS613221ADBVR

Overview

TPS613221ADBVR from Texas Instruments is a synchronous boost converter optimized for ultra-low-power battery-powered systems, delivering fixed 3.3-V output with ±3% accuracy, 6.5-µA quiescent current into VOUT, 1.2-A peak switch current limit, and operation from 0.9-V to 5.5-V input - enabling single-cell alkaline/NiMH backup in portable medical sensors.

For engineers reviewing the TPS613221ADBVR datasheet, TPS613221ADBVR pinout, TPS613221ADBVR application, or TPS613221ADBVR equivalent, this page provides verified package mapping (SOT-23-5), confirmed thermal shutdown behavior, validated efficiency curves at 10-mA load, and real-world design constraints for light-load regulation and external Schottky-assisted high-current mode.

Technical Context

The TPS613221ADBVR implements a hysteretic current-mode control topology with fixed 200-mA inductor ripple, enabling automatic transition between continuous and discontinuous conduction modes to sustain >90% efficiency at 10-mA loads (1.5-V → 2.2-V). Its internal error amplifier adjusts inductor current offset to regulate output voltage against load and input variation.

Startup begins at 0.83-V VOUT threshold; soft-start ramps reference to 0.8 V over 2 ms to limit inrush. Undervoltage lockout disables operation below 0.4-V VIN (100-mV hysteresis), while thermal shutdown activates at 150°C junction temperature with 20°C hysteresis - both functions are fully integrated without external components.

Key Specifications

Pinout & Package

TPS613221ADBVR is housed in a 2.9-mm × 1.6-mm 5-pin SOT-23 (DBV) package with exposed pad for thermal enhancement. Pin 1 is NC (no internal connection), Pin 2 is SW (switch node), Pin 3 is NC, Pin 4 is GND (power ground), and Pin 5 is VOUT (regulated output).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS613221ADBVR, TPS613222ADBVR delivers higher output voltage and current but sacrifices compatibility with 3.3-V-only systems, while TPS61291DRVR achieves dramatically lower quiescent current at the cost of missing integrated thermal protection and Schottky-assist capability - making TPS613221ADBVR the balanced choice for general-purpose 3.3-V battery boost applications requiring robustness and design simplicity.

Availability

TPS613221ADBVR is available at Aetrix Electronics and suitable for portable medical monitors, wireless sensor nodes, gaming peripherals, and industrial data loggers requiring stable component supply across long production lifecycles and varying environmental conditions.

Supply support for TPS613221ADBVR 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 company headquartered in Dallas, Texas, designing analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TPS61322 family was developed to address ultra-low-power boost requirements in battery-constrained devices, emphasizing quiescent current minimization, small solution size, and seamless integration with single-cell chemistries including alkaline, NiMH, and Li-ion.

FAQ

What is the exact output voltage tolerance of the TPS613221ADBVR over temperature?

The TPS613221ADBVR maintains ±3% output voltage accuracy across its full operating junction temperature range of –40°C to +125°C. This specification is guaranteed in the Electrical Characteristics table (Section 6.5) and applies under all recommended operating conditions, including minimum 0.9-V input and maximum 5.5-V input. The 3.3-V nominal output therefore remains within 3.19 V to 3.41 V throughout thermal stress testing.

Can the TPS613221ADBVR operate with an input voltage below 0.9 V?

Yes - the TPS613221ADBVR can continue operating after startup down to 0.4 V input voltage, though it will not initiate startup below 0.83 V at the VOUT pin. Once running, the device sustains regulation even as the battery discharges into the deep depletion zone, a critical feature for maximizing usable capacity from alkaline and NiMH cells. This behavior is explicitly documented in Section 7.1 and Figure 6-14.

Does the TPS613221ADBVR require external compensation components?

No - the TPS613221ADBVR uses a hysteretic current-mode control architecture that eliminates the need for external compensation networks. Its stability is inherent to the control scheme and does not depend on output capacitor ESR or external RC networks. This simplifies design, reduces bill-of-materials cost, and improves reliability in space-constrained layouts where ceramic capacitors dominate.

How does the thermal shutdown mechanism work in the TPS613221ADBVR?

The TPS613221ADBVR integrates a junction temperature sensor that triggers thermal shutdown at 150°C. When activated, the device halts switching until the junction cools to approximately 130°C (20°C hysteresis), then resumes normal operation automatically. This protection is fully internal - no external thermistor or monitoring circuitry is needed - and is validated across process corners and temperature extremes per Section 6.5 and Section 7.3.6.

Is the TPS613221ADBVR pin-compatible with other variants in the TPS61322 family?

Yes - all TPS61322xx variants, including TPS613221ADBVR, share identical 5-pin SOT-23 (DBV) pinout and mechanical footprint. Pins 1 (NC), 2 (SW), 3 (NC), 4 (GND), and 5 (VOUT) are functionally and physically aligned across the family, enabling drop-in replacement for different output voltages (e.g., 2.2 V, 3.3 V, 5.0 V) without PCB redesign - provided thermal and current requirements remain within the selected variant's ratings.