Texas Instruments TPS61021DSGR

Overview

TPS61021DSGR from Texas Instruments is a synchronous 3-A boost converter IC designed for ultra-low-voltage battery-powered systems. It operates from 0.5 V to 4.4 V input, delivers adjustable 1.8–4.0 V output, achieves 91% efficiency at 2.4 V_IN/3.3 V_OUT/1.5 A, uses 2-MHz switching, and features true input-output disconnection in shutdown - enabling extended runtime in single- or dual-cell alkaline/NiMH/Li-ion devices.

For engineers reviewing the TPS61021DSGR datasheet, TPS61021DSGR pinout, TPS61021DSGR application, or TPS61021DSGR equivalent, key selection considerations include its 0.5-V startup capability, ±2.5% reference accuracy over –40°C to 125°C, valley-current-limit protection, PFM/PWM mode transition, and WSON-8 thermal-pad package for compact high-current DC/DC designs.

Technical Context

The TPS61021DSGR implements adaptive constant-on-time valley-current-mode control with internal loop compensation, enabling stable operation across wide input (0.5–4.4 V) and output (1.8–4.0 V) ranges without external compensation. Its quasi-constant 2-MHz PWM frequency (reducing to 1 MHz below 1.5 V_IN) supports small 0.33–1.0 µH inductors and ceramic capacitors while maintaining >91% peak efficiency.

Functional modes include pass-through operation when V_IN > V_OUT, soft-start with ~200 µs typical ramp time, and robust protection: 4.35-V output overvoltage lockout with 0.1-V hysteresis, short-circuit current limiting down to ~100 mA at V_OUT < 1 V, and thermal shutdown at 150°C with 20°C hysteresis.

Key Specifications

Pinout & Package

TPS61021DSGR is housed in a thermally enhanced 2.0-mm × 2.0-mm WSON-8 package with exposed thermal pad (DSG suffix). The 8-pin layout supports high-current paths and low-inductance grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61021DSGR, TPS61022DSGR delivers higher current headroom but increases BOM cost and thermal design complexity, while MAX77818EWL+T adds digital control at the expense of analog simplicity, lower start-up voltage, and physical disconnection capability.

Availability

TPS61021DSGR is available at Aetrix Electronics and suitable for battery-powered IoT devices, portable medical equipment, and supercapacitor backup systems requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for TPS61021DSGR 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 TPS61021DSGR belongs to TI's ultra-low-voltage boost converter product line, engineered specifically for energy-constrained portable and industrial devices powered by primary batteries or energy-harvesting sources.

FAQ

What is the minimum input voltage required for TPS61021DSGR to start switching?

The TPS61021DSGR requires a minimum input voltage of 0.9 V to initiate startup (UVLO rising threshold), after which it can sustain operation down to 0.5 V once the output reaches 1.6 V. This two-stage UVLO enables deep battery discharge utilization while preventing erratic behavior during cold cranking or weak-cell conditions. The 0.5-V operational floor is confirmed across –40°C to 125°C and is a defining feature of the TPS61021DSGR versus standard boost converters.

Does TPS61021DSGR support true load disconnect during shutdown?

Yes, the TPS61021DSGR provides true input-output disconnection during shutdown: when the EN pin is pulled low, both internal MOSFETs turn off and no current flows from VIN to VOUT, eliminating reverse leakage. This is verified in the datasheet's "True Disconnection Between Input and Output During Shutdown" feature and measured shutdown current of ≤3.0 µA. For TPS61021DSGR-based systems, this ensures zero standby drain on primary batteries - essential for multi-year IoT deployments.

What output voltage accuracy does TPS61021DSGR guarantee over temperature?

The TPS61021DSGR guarantees ±2.5% reference voltage accuracy over the full –40°C to 125°C junction temperature range, as specified in Section 6.5 of the SLVSD21C datasheet. This applies to the internal 795-mV bandgap reference at the FB pin, directly determining output regulation accuracy when using precision external resistors. System-level VOUT accuracy also depends on resistor tolerance and layout - but the TPS61021DSGR itself contributes ≤±2.5% error across industrial temperatures.

Can TPS61021DSGR operate in pass-through mode, and under what conditions?

Yes, the TPS61021DSGR enters pass-through mode when VIN exceeds the regulated VOUT by ~1%, turning on the high-side PMOS FET to conduct directly. This occurs automatically when VIN rises above ~3.33 V for a 3.3-V output setting. During pass-through, VOUT ≈ VIN – (IOUT × R_DS(on) + IOUT × DCR_L). The TPS61021DSGR resumes PWM switching when VOUT drops to 98% of target - ensuring seamless transition without output glitches.

What thermal metrics apply to the TPS61021DSGR WSON-8 package?

The TPS61021DSGR in the DSG (WSON-8) package has a junction-to-ambient thermal resistance (R_θJA) of 71.1°C/W, junction-to-board (R_θJB) of 41.6°C/W, and junction-to-case (bottom) (R_θJC(bot)) of 13.0°C/W - all measured per JEDEC JESD51 standards. These values assume proper PCB layout: 1-in² 2-oz copper pad under the thermal pad, connected to internal ground planes. At 1.5 A output, thermal simulation shows ≤35°C rise above ambient with adequate copper area - confirming suitability for space-constrained portable designs.