Texas Instruments TPS61021DSGR

Summary of TPS61021DSGR from Texas Instruments

The TPS61021DSGR, manufactured by Texas Instruments, is a synchronous boost converter designed to address the power supply needs of portable, battery-powered devices. This model, housed in a compact 8-pin WSON package with an exposed pad, provides a robust solution for engineers looking to deliver stable voltage from batteries with highly variable or very low voltage levels. With a 3A internal switch and an adjustable output between 1.8 V and 4.0 V, the device achieves significant efficiency—up to 91% at typical conditions (VIN = 2.4 V, VOUT = 3.3 V, 1.5 A output). The capability to maintain operation from input voltages as low as 0.5 V and a minimum input voltage for startup at 0.9 V uniquely positions the TPS61021DSGR for maximized battery utilization in space-constrained handheld or IoT applications.

Main electrical specifications and performance metrics of TPS61021DSGR

TPS61021DSGR’s electrical specifications reflect its suitability for demanding mobile designs:

Input voltage: 0.5 V to 4.4 V

Output voltage: Adjustable from 1.8 V up to 4.0 V

Maximum switch current: 3 A

Quiescent current: 17 μA typical at light load, with only 0.5 μA typical (3 μA max) shutdown current

Switching frequency: 2 MHz (with a reduction to 1 MHz at very low input voltages)

Reference voltage accuracy: ±2.5% from -40°C to 125°C

Built-in high-efficiency synchronous rectifier (51 mΩ high-side, 58 mΩ low-side on resistance)

Output overvoltage protection threshold: 4.35 V (max)

Broad operating temperature: –40°C to +125°C

Performance charts show the device sustains high efficiency across a range of input/output combinations and current levels, maintaining robust output regulation from different battery chemistries—even as cells approach end-of-life voltage.

Operational functions and built-in safeguards of TPS61021DSGR

The TPS61021DSGR incorporates essential engineering-focused features:

Synchronous operation maximizes efficiency and minimizes external component count.

Automatic transition between fixed-frequency PWM at moderate to heavy loads and power-save (PFM) at light loads, yielding optimal efficiency over the entire load range.

Ultra-low quiescent current to minimize standby power draw, extending battery runtime in always-on systems.

True input-output disconnection in shutdown mode, preventing battery drain via leakage.

Under-voltage lockout (UVLO) ensures reliable startup and operation with automatic adaptation when battery voltage dips.

Comprehensive protection suite: output over-voltage, short-circuit, and thermal shutdown—safeguarding both device and system integrity.

Application examples and typical uses for TPS61021DSGR

Engineers can leverage TPS61021DSGR in battery-powered systems requiring reliable step-up conversion. Typical applications include:

IoT edge devices and wireless sensor nodes powered by single or dual-cell alkaline, NiMH, coin cell, or Li-ion batteries

Portable medical equipment, where stable output despite fluctuating input is mandatory for safety and compliance

Bluetooth accessories, game controllers, and thermostats, which benefit from long battery life and compact PCBA footprints

Supercap backup and emergency power switches, particularly for devices demanding fast, efficient switching and high reliability

The component’s high efficiency and low shutdown/quiescent consumption are especially valuable in applications with strict energy budgets or in devices spending extended periods in standby.

Design strategies and integration guidelines for TPS61021DSGR

For successful integration of TPS61021DSGR into your design, attention should be paid to the following:

Inductor selection: The suggested inductance range is 0.2 μH to 1.3 μH. Lower values enable reduced PCBA size but may raise inductor ripple current.

Output capacitor selection: Minimum of 10 μF (20 μF preferred for loads >0.3 A) to ensure output stability.

Board layout: The 2 mm x 2 mm WSON footprint facilitates dense layouts but requires well-considered thermal and electrical grounding. A low-impedance ground path and sufficient copper area for heat dissipation are recommended.

Enable logic: The EN pin provides digital control for power sequencing and power path management.

Input filtering: Use at least a 1 μF ceramic capacitor close to VIN for minimum ripple and optimal transient response.

Thermal management: With a junction-to-ambient thermal resistance of 71.1°C/W, device placement and thermal vias under the exposed pad are critical for designs approaching maximum switch current in high ambient temperatures.

Package details, heat dissipation, and durability of TPS61021DSGR

The device is offered in a robust, industry-standard 8-WSON (2 mm x 2 mm) with an exposed pad for efficient thermal dissipation—a design feature especially useful at high switching frequencies and output currents. The TPS61021DSGR is RoHS-compliant, moisture sensitivity level 2 (1 year), and is rated for operation up to +125°C (junction), which enhances longevity and reliability even in demanding portable or outdoor environments. ESD tolerance (2 kV HBM, 500 V CDM) further augments system durability during manufacturing and operation.

Alternative or substitute options for TPS61021DSGR

Given the obsolescence status of the TPS61021DSGR, customers seeking a drop-in or functionally similar solution may consider evaluating the following options from Texas Instruments or other comparable suppliers:

Texas Instruments TPS61022: Offers similar output current capability, ultra-low input voltage operation, and advanced protection schemes in a compact package.

Texas Instruments TPS61220/61221: Suitable for lower current applications but also offer ultra-low input and output flexibility.

Analog Devices LTC3122: 3A boost converter with adjustable output and strong efficiency performance.

Maxim MAX756/757: Step-up DC-DC controllers able to work with single/dual-cell battery applications.

When selecting a replacement, engineers should assess key metrics—including input/output range, efficiency curves, package compatibility, protection features, and ecosystem support—to guarantee continued system performance.

Conclusion

The TPS61021DSGR by Texas Instruments remains a highly relevant reference for engineers designing low-voltage boost converters for portable and battery-powered systems. Its comprehensive feature set, robust protection architecture, and design flexibility address a multitude of modern power conversion challenges. However, considering supply status, forward-looking engineers should actively evaluate potential drop-in alternatives with similar or enhanced capabilities to ensure long-term availability and design scalability in mission-critical platforms.