TPS63021 - 4A Switch Buck-Boost Converter | Texas Instruments
MPN: TPS63021 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.92 | $1,920.00 |
TPS63021 Overview
A buck-boost converter is a type of DC-DC converter that can step up (boost) or step down (buck) the input voltage to maintain a constant output voltage, regardless of whether the input is higher or lower than the output. This is essential in battery-powered systems where the battery voltage declines over time, falling below the required rail voltage. The TPS63021 belongs to the power management IC family, specifically within DC-DC converters, and is a key component in portable electronics.
Key features include a fixed 3.3V output voltage, high efficiency up to 96%, and a low quiescent current of 50 µA. The device integrates synchronous rectification, which eliminates the need for an external Schottky diode, improving efficiency and reducing component count. It also features load disconnect, light-load efficiency, and undervoltage lockout (UVLO) with fixed thresholds. The TPS63021 operates over a junction temperature range of -40°C to +125°C.
Technically, the TPS63021 uses a proprietary control architecture that seamlessly transitions between buck and boost modes, ensuring stable output voltage with minimal ripple. The 4A switches allow for high output currents, and the device can deliver up to 3A in boost mode from a 3.3V input. The VFDFN package with exposed pad provides excellent thermal performance, with a thermal resistance of 40°C/W, enabling compact designs without external heatsinks.
Typical applications include portable electronics, battery-powered devices, and systems powered by supercapacitors. The TPS63021 is ideal for powering microcontrollers, sensors, and wireless modules in IoT devices, where input voltage varies widely. Its high efficiency extends battery life, and its small footprint saves board space.
When designing with the TPS63021, ensure proper input and output capacitor selection to minimize ripple and maintain stability. Use low-ESR ceramic capacitors with sufficient voltage rating. The exposed pad must be soldered to a thermal land on the PCB for optimal heat dissipation.
Drop-in alternatives for TPS63021 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS63020DSJR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TPS63031DSJR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TPS63021 Maximum Ratings & Electrical Characteristics
| Output Type | Fixed |
| Output Voltage | 3.3 V |
| Maximum Output Current | 3 A |
| Input Voltage Range | 1.8 V to 5.5 V |
| Switch Current Limit | 4 A |
| Efficiency | 96% (typical) |
| Quiescent Current | 50 µA |
| Switching Frequency | 2.4 MHz (typical) |
| Synchronous Rectification | Yes |
| Load Disconnect | Yes |
| Light-Load Efficiency | Yes |
| Undervoltage Lockout | Fixed |
| Package | 14-VFDFN (DSJ) 3mm x 4mm |
| Operating Temperature Range | -40°C to +125°C |
| RoHS Status | Compliant |
TPS63021 Pin Configuration
| Pin 1 | VIN — Input voltage supply |
| Pin 2 | EN — Enable pin (active high) |
| Pin 3 | GND — Ground |
| Pin 4 | SW — Switch node connection to inductor |
| Pin 5 | SW — Switch node connection to inductor |
| Pin 6 | GND — Ground |
| Pin 7 | VOUT — Output voltage |
| Pin 8 | VOUT — Output voltage |
| Pin 9 | FB — Feedback pin (for adjustable versions) |
| Pin 10 | GND — Ground |
| Pin 11 | PG — Power good indicator |
| Pin 12 | GND — Ground |
| Pin 13 | VIN — Input voltage supply |
| Pin 14 | GND — Ground |
Typical Applications
TPS63021 is suitable for 6 applications: Battery-Powered IoT Devices, Portable Electronics, Wireless Modules and Transceivers, Industrial Sensors and Actuators, Medical Devices, Supercapacitor Backup Power.
Battery-Powered IoT Devices
The TPS63021 is ideal for IoT devices powered by batteries, as it maintains a stable 3.3V output from a wide input range (1.8V to 5.5V). Its high efficiency (up to 96%) and low quiescent current (50 µA) extend battery life, making it perfect for wireless sensors and smart home devices. The small VFDFN package saves board space, and the 4A switch supports peak loads during radio transmission.
Recommended
Portable Electronics
In portable devices like handheld instruments and media players, the TPS63021 provides a regulated 3.3V rail from a single Li-ion cell (3.0-4.2V) or two alkaline cells (2.4-3.0V). The buck-boost topology ensures the output stays at 3.3V even as the battery discharges below 3.3V. With up to 3A output, it can power processors, displays, and audio amplifiers. The high switching frequency (2.4 MHz) allows small external components, reducing the overall solution size.
Recommended
Wireless Modules and Transceivers
The TPS63021 is well-suited for powering wireless modules that require a stable 3.3V supply from varying battery voltages. Its low output noise and high PSRR help maintain signal integrity in RF transceivers. The device can handle the high current bursts during transmission, thanks to its 4A switch. The enable pin allows power sequencing, and the load disconnect feature isolates the load when disabled, saving power in standby.
Recommended
Industrial Sensors and Actuators
In industrial applications, the TPS63021 can be powered from a 24V bus stepped down via a pre-regulator, or directly from a 3.3V rail. Its wide input range and robust thermal performance make it suitable for harsh environments. The device provides a clean, regulated supply for sensors, ADCs, and microcontrollers, ensuring accurate measurements. The small footprint and high efficiency reduce heat generation, which is critical in sealed enclosures.
Recommended
Medical Devices
The TPS63021 is used in portable medical devices like glucose monitors and pulse oximeters, where battery life and reliability are critical. Its low quiescent current and high efficiency extend battery life, and the wide input range accommodates various battery configurations. The device's small package is ideal for compact, wearable designs. The output voltage accuracy and low ripple ensure stable operation of sensitive analog front-ends.
Recommended
Supercapacitor Backup Power
The TPS63021 can be used in systems with supercapacitor backup, where the input voltage can drop significantly during discharge. The buck-boost topology maintains a constant 3.3V output even as the supercapacitor voltage falls below 3.3V. This is useful for powering real-time clocks, SRAM, or microcontrollers during power loss. The device's high efficiency ensures maximum energy extraction from the supercapacitor.
Recommended
Recommended Products Summary
Engineering reference data for TPS63021 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS63020DSJR | TPS63031DSJR | TPS63000DRCR |
|---|---|---|---|---|
| Package | 14-VFDFN (DSJ) | 14-VFDFN (DSJ) | 14-VFDFN (DSJ) | 10-VSON (DRC) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Voltage | 3.3V (fixed) | Adjustable | Adjustable | Adjustable |
| Maximum Output Current | 3A | 3A | 3A | 1.2A |
| Input Voltage Range | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V |
| Switch Current Limit | 4A | 4A | 4A | 1.8A |
| Quiescent Current | 50 µA | 50 µA | 50 µA | 40 µA |
| Switching Frequency | 2.4 MHz | 2.4 MHz | 2.4 MHz | 1.2 MHz |
Key Differentiators
- Fixed 3.3V output simplifies design (vs TPS63020DSJR)
- Higher output current than TPS63000 (vs TPS63000DRCR)
- Same package as TPS63020/31 (vs TPS63020DSJR)
Design Notes
Place the input and output capacitors as close to the VIN and VOUT pins as possible to minimize parasitic inductance. Use low-ESR ceramic capacitors, typically 10 µF for input and 22 µF for output. The exposed pad must be soldered to a thermal land with multiple vias to the ground plane for effective heat dissipation.
Keep the switch node (SW) trace short and wide to reduce parasitic capacitance and inductance. Route the feedback sense line away from the switch node to avoid noise coupling. For adjustable versions, place the feedback resistors close to the FB pin and use Kelvin connections to the output capacitor.
The TPS63021 can dissipate significant power at high output currents. With a thermal resistance of 40°C/W, a 1W dissipation results in a 40°C temperature rise. Ensure adequate copper area on the PCB and consider airflow for applications exceeding 2W dissipation. Monitor junction temperature to stay within the -40°C to +125°C range.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified. Lead-free per datasheet.
