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Texas Instruments TPS63021DSJT
- Part No.:
- TPS63021DSJT
- Manufacturer:
- Texas Instruments
- Package:
- 14-VFDFN Exposed Pad
- Datasheet:
-
TPS63021DSJT.pdf
- Description:
- IC REG BUCK BST 3.3V 3.5A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,718
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Product details
Overview
TPS63021DSJT from Texas Instruments is a fixed-output 3.3 V, 4-A synchronous buck-boost DC/DC converter in a 3 mm × 4 mm VSON-14 package with exposed thermal pad. It operates from 1.8 V to 5.5 V input, delivers up to 3 A output current at 3.3 V (VIN > 2.5 V), and features 2.4 MHz fixed-frequency PWM with power-save mode, power-good flag, and integrated overtemperature/overvoltage protection - used in battery-powered IP cameras and e-cigarette power rails.
For engineers reviewing the TPS63021DSJT datasheet, TPS63021DSJT pinout, TPS63021DSJT application, or TPS63021DSJT equivalent, key selection criteria include its fixed 3.3 V output, 4-A switch current limit, 25 µA quiescent current in power-save mode, dual-inductor topology, and PG open-drain signal for system sequencing and fault monitoring.
Technical Context
The TPS63021DSJT implements an average current-mode control architecture with input/output voltage feed-forward for fast transient response. Its four-switch synchronous topology enables seamless automatic transition between buck and boost modes without discontinuous operation when VIN ≈ VOUT.
It integrates dual ground domains (GND for control logic, PGND for power switches), dynamic current limiting that scales with VIN and die temperature, and a dedicated VINA pin for stable control-stage supply - all supporting robust operation across –40°C to 85°C ambient with internal overtemperature shutdown at 140°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1% (3.267–3.333 V) - eliminates external feedback resistors and reduces BOM count. |
| Input Voltage Range | 1.8 V to 5.5 V - supports single-cell Li-ion (2.7–4.2 V), two/three-cell alkaline/NiMH (down to ~1.8 V), and supercapacitor backup rails. |
| Max Output Current | 3 A at VOUT = 3.3 V and VIN > 2.5 V - sufficient for powering SoCs, image sensors, and RF modules in portable devices. |
| Switch Current Limit | 4 A typical average - enables high peak load handling while maintaining thermal safety under transient conditions. |
| Quiescent Current | 25 µA in power-save mode - extends battery runtime in always-on low-power states like video doorbell standby. |
| Switching Frequency | 2.4 MHz nominal (2.2–2.6 MHz range) - allows use of small 1.5 µH inductors and compact ceramic output capacitors. |
| Power-Good Signal | Open-drain PG pin with 0.04 V low-level voltage at 10 µA sink - provides reliable system reset and sequencing control. |
Pinout & Package
TPS63021DSJT is housed in a thermally enhanced 14-pin VSON package (3 mm × 4 mm) with an exposed PGND-connected thermal pad on the bottom. The package supports high-current routing and efficient PCB heat dissipation via the thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA | Control-stage supply input | Separate 1.8–5.5 V rail for biasing internal logic - isolates control circuitry from noisy power-stage PGND transients. |
| GND | Logic ground reference | Reference node for FB, EN, PS/SYNC, and internal error amplifier - must be connected to PGND at single point near GND pin. |
| FB | Feedback input | Internally tied to VOUT for fixed 3.3 V version - no external resistor divider required; simplifies layout and improves regulation accuracy. |
| VOUT | Regulated output (pins 4, 5) | Dual-source/sink output pins reduce trace inductance and improve current sharing - critical for high-current stability. |
| VIN | Power-stage supply input (pins 10, 11) | Dual-input pins minimize IR drop and EMI - designed for direct connection to input bulk capacitor and battery terminals. |
| L1 / L2 | Inductor connections (L1: pins 8,9; L2: pins 6,7) | Four dedicated inductor terminals support dual-inductor configuration - enables interleaved current paths and lower ripple. |
| EN | Enable control (active-high) | Logic-level input with 1.2 V VIH threshold - compatible with standard GPIOs; disables converter and disconnects load during shutdown. |
| PS/SYNC | Mode select / sync input | Low = enable power-save mode; high = force PWM; external clock = synchronize switching frequency - enables EMI reduction and multi-rail coordination. |
| PG | Power-good indicator (open-drain) | Asserts low when VOUT is within ±5% of regulation - provides early fault detection before output collapse; requires external pull-up. |
| PGND | Power ground (exposed pad + pins) | Primary return path for high-current switches - exposed thermal pad must be soldered to large copper pour for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Enables fast line/load transient response (<10 µs recovery) and stable operation across full VIN–VOUT crossover region. |
| Dynamic current limiting | Reduces switch current limit as VIN drops below 2.3 V or die temperature exceeds 125°C - prevents thermal runaway during weak-battery or overload events. |
| Power-save mode with dynamic voltage positioning | Maintains 3% higher output voltage at light load - provides headroom for transient droop and allows smaller output capacitance (e.g., 3×22 µF). |
| Integrated overvoltage protection | Clamps VOUT at 5.5–7 V if FB loop fails - protects downstream ICs without requiring external crowbar circuits. |
| Load disconnect during shutdown | Opens internal FETs to isolate VOUT from VIN - eliminates battery drain and prevents backfeed into input rail. |
Applications
| IP Network Camera Power Supply | E-Cigarette Battery Management |
|---|---|
Use Scenario: Powers image sensor, ISP, and Wi-Fi SoC from single-cell Li-ion (2.8–4.2 V) with tight 3.3 V rail tolerance. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering regulated 3.3 V with PG signaling for safe boot sequence and brownout detection. Use Value: Maintains stable 3.3 V output even as battery discharges below 2.5 V, enabling full camera functionality until end-of-life. | Use Scenario: Supplies MCU, display, and heating coil driver from 3.7 V Li-ion with variable load (10 mA idle → 2 A puff). IC Role / Device Role / Timing Role: High-efficiency power converter with soft-start and short-circuit protection for user-safety-critical heating element control. Use Value: Delivers 3 A peak current with <100 ns fault response, preventing coil overheating during abnormal draw or dry-puff conditions. |
| Video Doorbell System Rail | Single-Board Computer Pre-regulator |
Use Scenario: Powers ARM Cortex-M7 SoC and audio codec from rechargeable 3.6 V NiMH pack with intermittent motion-triggered wake cycles. IC Role / Device Role / Timing Role: Always-on pre-regulator with 25 µA quiescent current and PG-driven wake-up signaling to main processor. Use Value: Extends battery life beyond 6 months per charge by minimizing standby loss while ensuring deterministic startup timing. | Use Scenario: Generates clean 3.3 V for Raspberry Pi CM4 carrier board powered by 5 V USB or 3.7 V battery input. IC Role / Device Role / Timing Role: Input-flexible buck-boost stage replacing linear regulators to eliminate thermal derating at high ambient temperatures. Use Value: Achieves >92% efficiency at 1.5 A load across 3.0–5.5 V input, reducing board temperature rise by >15°C vs. LDO solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJT | Adjustable output (1.2–5.5 V) via external resistor divider; identical pinout, specs, and package. | Requires external FB resistors; suitable when multiple output voltages needed on same PCB footprint. | Select TPS63020DSJT only if programmability justifies added BOM cost and layout complexity. |
| MAX77827BEWL+T | 3.3 V fixed output, but 2.5 A max output current and 1.2 MHz switching frequency; different pinout and package (WLP-20). | Limited peak current and lower frequency require larger inductors/caps; not drop-in compatible. | Choose MAX77827BEWL+T only for space-constrained WLP designs accepting reduced current capability. |
Compared with TPS63021DSJT, the TPS63020DSJT offers design flexibility at the cost of extra components, while the MAX77827BEWL+T trades current capability and layout compatibility for ultra-small form factor - making TPS63021DSJT optimal for cost-sensitive, high-current, pin-compatible upgrades.
Availability
TPS63021DSJT is available at Aetrix Electronics and suitable for IP network cameras, e-cigarette electronics, video doorbells, single-board computers, and industrial PLCs requiring stable component supply with guaranteed long-term sourcing.
Supply support for TPS63021DSJT 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 portable systems needing wide-input, fixed-or-adjustable buck-boost regulation with minimal external components and robust protection features.
FAQ
What is the maximum continuous output current of the TPS63021DSJT?
The TPS63021DSJT delivers up to 3 A continuous output current when VIN > 2.5 V and VOUT = 3.3 V, as confirmed in the Electrical Characteristics table. This rating assumes proper PCB thermal design with the exposed thermal pad soldered to ≥200 mm² of 2-oz copper. At lower input voltages (e.g., VIN = 1.8 V), the maximum output current decreases to ~2.2 A due to dynamic current limiting.
Does the TPS63021DSJT require external feedback resistors?
No, the TPS63021DSJT does not require external feedback resistors because it integrates a precision-trimmed internal resistor divider for its fixed 3.3 V output. The FB pin is internally connected to VOUT, eliminating layout sensitivity and component tolerance errors associated with external dividers - a key distinction from the adjustable TPS63020DSJT variant.
How does the power-good (PG) pin function on the TPS63021DSJT?
The PG pin on the TPS63021DSJT is an open-drain output that pulls low when the regulated output voltage falls outside ±5% of 3.3 V. It asserts within microseconds of output deviation, providing early fault indication before catastrophic collapse. An external pull-up resistor (typically 10–100 kΩ to VCC) is required to generate a logic-high signal during normal operation.
Can the TPS63021DSJT operate with only one inductor?
No, the TPS63021DSJT requires two separate 1.5 µH inductors - one connected to L1 pins (8,9) and another to L2 pins (6,7). Its four-switch buck-boost architecture relies on dual inductors to manage current paths in buck vs. boost modes. Using a single inductor violates the functional block diagram and will prevent regulation or cause device failure.
What thermal considerations apply to the TPS63021DSJT's exposed pad?
TPS63021DSJT's exposed thermal pad must be soldered to a solid PGND copper pour with ≥6 thermal vias (0.3 mm diameter) connecting to inner/ground planes. Per TI's datasheet, this achieves RθJB = 17°C/W. Inadequate pad connection raises junction temperature, triggering overtemperature shutdown at 140°C and reducing achievable output current by up to 30% at 60°C ambient.
TPS63021DSJT 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)
TPS63021DSJT FAQ
1.How can I place an order for TPS63021DSJT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS63021DSJT 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 TPS63021DSJT reliable?
The price and inventory of TPS63021DSJT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS63021DSJT is usually 5 days.
3.What payment methods are accepted for TPS63021DSJT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS63021DSJT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS63021DSJT?
TPS63021DSJT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS63021DSJT 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 TPS63021DSJT?
For technical support, including TPS63021DSJT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS63021DSJT requirements.
6.How does Aetrix verify that TPS63021DSJT is sourced from the original manufacturer or authorized distributors?
All TPS63021DSJT 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 TPS63021DSJT meets industry standards.
7.What is the process for return or replacement of TPS63021DSJT?
All TPS63021DSJT units undergo pre-shipment inspection (PSI). If there is an issue with TPS63021DSJT, 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 TPS63021DSJT part is unused and in its original packaging.
Return procedure for TPS63021DSJT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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