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Texas Instruments TPS63021DSJR
- Part No.:
- TPS63021DSJR
- Manufacturer:
- Texas Instruments
- Package:
- 14-VFDFN Exposed Pad
- Datasheet:
-
TPS63021DSJR.pdf
- Description:
- IC REG BUCK BST 3.3V 3.5A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,586
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Product details
Overview
TPS63021DSJR from Texas Instruments is a fixed-output 3.3 V, 4-A synchronous buck-boost DC/DC converter in a 14-pin VSON (3 mm × 4 mm) package. It operates from 1.8 V to 5.5 V input, delivers up to 3 A continuous output current at 3.3 V, and features power-good signaling, thermal shutdown, and automatic buck/boost mode transition for battery-powered EPOS terminals and IP network cameras.
For engineers reviewing the TPS63021DSJR datasheet, TPS63021DSJR pinout, TPS63021DSJR application, or TPS63021DSJR equivalent, key selection criteria include its fixed 3.3 V output, 2.4 MHz switching frequency with synchronization capability, 25 µA quiescent current in power-save mode, and integrated 4-switch architecture enabling seamless operation across input voltages below and above VOUT.
Technical Context
The TPS63021DSJR implements an average current-mode control architecture with input/output voltage feed-forward for fast transient response. Its four internal N-channel MOSFETs enable synchronous conversion in both buck and boost configurations, with automatic mode transition when VIN approaches VOUT - eliminating classical buck-boost overlap and minimizing RMS switch/inductor current.
It integrates dual ground domains (GND for control logic, PGND for power switches), undervoltage lockout (1.5 V threshold on VINA), overvoltage protection (7 V clamp), and overtemperature shutdown (140 °C with 20 °C hysteresis). The PS/SYNC pin supports power-save enable/disable and external clock synchronization via PLL.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1% (3.267–3.333 V), internally trimmed; no external feedback divider required. |
| Input Voltage Range | 1.8 V to 5.5 V - supports single-cell Li-ion, two/three-cell alkaline/NiMH, and supercapacitor sources. |
| Max Output Current | 3 A continuous at VOUT = 3.3 V and VIN ≥ 2.5 V - enables high-power peripherals in portable devices. |
| Switching Frequency | 2.4 MHz (±10%), synchronizable via PS/SYNC pin - allows compact 1.5 µH inductor and low-profile ceramic capacitors. |
| Quiescent Current | 25 µA in power-save mode - extends battery life in always-on or low-duty-cycle applications like video doorbells. |
| Efficiency Peak | 95% at 1 A load, VIN = 3.6 V → VOUT = 3.3 V - reduces thermal load in space-constrained PCB layouts. |
| Power-Good Output | Open-drain PG signal asserts low when VOUT deviates >5% - provides early fault detection for system-level sequencing. |
Pinout & Package
TPS63021DSJR is housed in a thermally enhanced 14-pin VSON package (DSJ) measuring 3 mm × 4 mm with an exposed thermal pad connected to PGND. The package supports high-current routing and efficient heat dissipation in compact designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA (Pin 1) | Control-stage supply | Provides bias for internal logic; must be decoupled with 100 nF capacitor; independent of power-stage VIN. |
| GND (Pin 2) | Logic ground reference | Reference for EN, PS/SYNC, FB, and control circuitry; separate from PGND to prevent ground shift. |
| FB (Pin 3) | Feedback input | Internally shorted to VOUT for fixed-output TPS63021 - no external resistor divider needed. |
| VOUT (Pins 4,5) | Regulated output | High-current output node; pins paralleled to support 3 A load; requires ≥3×22 µF bulk capacitance. |
| L1 (Pins 8,9) | Inductor connection | Connects to one end of 1.5 µH inductor; paired with L2 for 4-switch buck-boost topology. |
| L2 (Pins 6,7) | Inductor connection | Connects to other end of same 1.5 µH inductor; forms coupled path with L1 for bidirectional energy transfer. |
| VIN (Pins 10,11) | Power-stage supply | Input for high-current switches; pins paralleled; accepts 1.8–5.5 V; requires ≥2×10 µF local decoupling. |
| EN (Pin 12) | Enable control | Active-high digital input; must not float; pulls device into shutdown (1 µA ISHDN) when low. |
| PS/SYNC (Pin 13) | Mode control / sync input | Low = enable power-save mode; high = force PWM; external clock input synchronizes switching frequency. |
| PG (Pin 14) | Power-good indicator | Open-drain output; pulled low when VOUT regulation fails (>5% deviation); requires external pull-up. |
| PGND (Exposed Pad) | Power ground return | Thermal pad tied to PGND plane; mandatory for thermal performance and switch current return path. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch synchronous buck-boost topology | Enables seamless voltage regulation across VIN < VOUT and VIN > VOUT without external mode control logic. |
| Dynamic voltage positioning (DVP) | Maintains +3% VOUT headroom at light load to absorb transient droop - reduces required output capacitance by up to 50%. |
| Integrated overtemperature & overvoltage protection | Shuts down at 140 °C (20 °C hysteresis) and clamps output at 7 V - eliminates need for external protection circuitry. |
| Separate VINA and VIN supplies | Isolates control logic from power-stage noise; allows stable operation even during high di/dt switching events. |
| Load disconnect during shutdown | Internally opens power path between VIN and VOUT - prevents battery drain and backfeed in standby mode. |
Applications
| EPOS Terminal Power Supply | IP Network Camera Pre-regulator |
|---|---|
Use Scenario: Portable data terminal powered by single-cell Li-ion battery (2.8–4.2 V) requiring stable 3.3 V for MCU, display, and barcode scanner. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering regulated 3.3 V across full battery discharge curve while maintaining >90% efficiency at 500 mA load. Use Value: Eliminates need for separate buck and boost stages; supports deep discharge down to 1.8 V input without brownout. | Use Scenario: Outdoor IP camera with PoE+ input and backup battery, needing clean 3.3 V for image sensor and Wi-Fi SoC under variable input conditions. IC Role / Device Role / Timing Role: Input pre-regulator stabilizing 3.3 V rail despite PoE voltage ripple (37–57 V) stepped down via intermediate DC/DC and battery switchover. Use Value: Maintains regulation during battery switchover transients; PG signal triggers firmware failover before VOUT collapse. |
| Video Doorbell Backup Supply | SSD Supercapacitor Backup |
Use Scenario: Battery-powered video doorbell with motion-triggered wake-up, requiring ultra-low quiescent current and fast start-up from sleep. IC Role / Device Role / Timing Role: Always-on 3.3 V supply enabling sub-100 ms wake-up from 25 µA power-save mode; PG confirms rail readiness before sensor activation. Use Value: Extends lithium primary battery life beyond 1 year; DVP ensures no frame drop during wake-up surge. | Use Scenario: Enterprise SSD using supercapacitor bank to maintain write cache integrity during sudden AC loss. IC Role / Device Role / Timing Role: Bidirectional buck-boost controller charging supercapacitors from 3.3 V rail and discharging them to sustain 3.3 V during power interruption. Use Value: Supports >100,000 charge/discharge cycles; 4-A switches handle rapid 2-A backup load surges without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Adjustable output (1.2–5.5 V) via external resistor divider; identical pinout, package, and electrical specs otherwise. | Requires external FB resistors; suitable when multiple output voltages are needed on same PCB footprint. | Select TPS63020DSJR only if adjustable VOUT is required; TPS63021DSJR saves BOM cost and layout area with fixed 3.3 V. |
| MAX77829BEWL+T | 3.3 V fixed output, but uses 2.2 MHz switching, lower 2.5 A max output, and no PG output; 16-pin WLP package. | Lacks power-good signaling and thermal headroom for sustained 3 A loads; limited to space-constrained wearables. | Choose MAX77829BEWL+T only for ultra-small footprints where 2.5 A peak suffices and PG is unnecessary. |
Compared with TPS63021DSJR, TPS63020DSJR offers design flexibility at the cost of two external resistors and slightly higher BOM count, while MAX77829BEWL+T trades output current headroom and system monitoring capability for minimal board area - making TPS63021DSJR optimal for industrial-grade 3.3 V systems demanding reliability, diagnostics, and full 3 A delivery.
Availability
TPS63021DSJR is available at Aetrix Electronics and suitable for EPOS terminals, IP network cameras, video doorbells, SSD backup power, and land mobile radios requiring stable component supply, long-lifecycle assurance, and production-ready qualification.
Supply support for TPS63021DSJR 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 ICs, with decades of expertise in high-efficiency DC/DC conversion.
The TPS6302x product line was engineered specifically for battery-powered and energy-harvesting applications requiring wide-input, fixed-or-adjustable buck-boost regulation with robust protection and minimal external components - targeting portable industrial and consumer edge devices.
FAQ
What is the recommended inductor value for TPS63021DSJR?
The TPS63021DSJR is optimized for a 1.5 µH shielded power inductor rated for ≥4.5 A saturation current. Texas Instruments specifies this value in the datasheet's typical application schematic and layout guidelines to ensure stable operation across the full 1.8–5.5 V input range and 3 A load. Using a different inductance may affect loop stability, transient response, or peak switch current limits.
Does TPS63021DSJR require external feedback resistors?
No, the TPS63021DSJR has an internally trimmed feedback network for its fixed 3.3 V output. Pin FB (Pin 3) must be connected directly to VOUT per the datasheet - no external resistor divider is needed or permitted. This simplifies layout, reduces BOM count, and improves output accuracy versus adjustable variants like TPS63020DSJR.
How does the power-good (PG) pin function on TPS63021DSJR?
The PG pin on TPS63021DSJR is an open-drain output that pulls low when the regulated output deviates by more than ±5% from 3.3 V. It monitors the control loop status in real time and provides the earliest possible indication of regulation failure. An external pull-up resistor (typically to 3.3 V or 5 V) is required to generate a valid logic-high signal during normal operation.
Can TPS63021DSJR operate with input voltage below 2.0 V?
Yes, the TPS63021DSJR supports input voltages as low as 1.8 V per its absolute minimum rating, and startup is guaranteed down to 1.8 V at room temperature. At cold temperatures or under heavy load, minimum startup voltage rises to 1.9 V. Operation below 1.8 V risks UVLO activation and unregulated output - it is not recommended for reliable use.
What thermal considerations apply to TPS63021DSJR in a 3 A application?
In a 3 A, 3.3 V application with 3.6 V input, TPS63021DSJR dissipates ~0.5 W. Its RθJA is 41.8 °C/W, so junction temperature rise is ~21 °C above ambient. To maintain TJ ≤ 125 °C, ambient must stay ≤ 104 °C - achievable with the exposed thermal pad soldered to ≥2 cm² of 2-oz copper and 2 internal ground planes. Thermal derating begins above 85 °C ambient.
TPS63021DSJR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3.5A (Switch)
- Frequency - Switching:
- 2.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-VSON (4x3)
TPS63021DSJR FAQ
1.How can I place an order for TPS63021DSJR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS63021DSJR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS63021DSJR reliable?
The price and inventory of TPS63021DSJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS63021DSJR is usually 5 days.
3.What payment methods are accepted for TPS63021DSJR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS63021DSJR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS63021DSJR?
TPS63021DSJR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS63021DSJR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS63021DSJR?
For technical support, including TPS63021DSJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS63021DSJR requirements.
6.How does Aetrix verify that TPS63021DSJR is sourced from the original manufacturer or authorized distributors?
All TPS63021DSJR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS63021DSJR meets industry standards.
7.What is the process for return or replacement of TPS63021DSJR?
All TPS63021DSJR units undergo pre-shipment inspection (PSI). If there is an issue with TPS63021DSJR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS63021DSJR part is unused and in its original packaging.
Return procedure for TPS63021DSJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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