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Texas Instruments TPS628503DRLR
- Part No.:
- TPS628503DRLR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-583
- Datasheet:
-
TPS628503DRLR.pdf
- Description:
- IC REG BUCK ADJ 3A SOT583
- Quantity:
- Payment:
- Shipping:
Inventory:1,973
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Product details
Overview
TPS628503DRLR from Texas Instruments is a synchronous step-down DC/DC converter delivering up to 3A peak output current, operating from 2.7V to 6V input, with adjustable 0.6V–5.5V output voltage, 1% feedback accuracy over temperature, and 17µA quiescent current - used in motor drives and factory automation power rails.
For engineers reviewing the TPS628503DRLR datasheet, TPS628503DRLR pinout, TPS628503DRLR application, or TPS628503DRLR equivalent, key selection criteria include its SOT583 package footprint, 1.8–4MHz adjustable switching frequency, forced-PWM/PPM mode control via MODE/SYNC, active output discharge, and power-good window comparator functionality.
Technical Context
The TPS628503DRLR implements a peak current mode control topology with internally compensated loop and dual compensation settings selectable via COMP/FSET pin resistor or logic state. It supports external synchronization on MODE/SYNC across 1.8–4MHz while maintaining stable regulation with ceramic output capacitors as low as 8µF (for VOUT ≥ 3.3V).
It integrates high-side (65–120mΩ) and low-side (33–70mΩ) MOSFETs, delivers 3A peak current at ≤85°C junction temperature, and features precise enable with user-defined UVLO, 100% duty-cycle capability, and thermal shutdown at 170°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 6V - supports single-cell Li-ion, USB PD, and industrial 3.3V/5V rails without pre-regulation. |
| Output Current | 3A peak - enables compact POL for FPGA I/O banks, motor gate drivers, or multi-rail SoC subsystems. |
| Feedback Accuracy | ±1% over –40°C to +150°C - ensures tight regulation for core voltages requiring <±2% tolerance. |
| Quiescent Current | 17µA typical - extends battery life in always-on industrial sensors or low-power standby modes. |
| Switching Frequency | 1.8–4MHz adjustable - allows optimization of size vs. efficiency; avoids AM radio band and enables use of 0.47µH inductors. |
| Thermal Shutdown | 170°C threshold with 15°C hysteresis - protects against sustained overload or poor PCB thermal design. |
| Power-Good Output | Open-drain window comparator - provides reliable system sequencing and fault detection without external comparators. |
Pinout & Package
TPS628503DRLR is housed in an 8-pin SOT583 package (1.60mm × 2.10mm), optimized for high-density layouts and thermal performance with exposed pad (DRL variant). The pinout supports compact 2-layer PCB designs with minimal external components.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Accepts 2.7–6V; requires local 10µF ceramic input capacitance placed adjacent to pin for EMI suppression and transient response. |
| SW | Switch node | Connects internal high- and low-side MOSFETs; must be routed with minimal loop area to reduce radiated emissions and voltage spikes. |
| GND | Ground reference | Common return for power and signal paths; ties to thermal pad for optimal heat dissipation and noise immunity. |
| EN | Enable control | Logic-compatible input with 1.0–1.15V rising threshold; enables programmable UVLO and precise power sequencing via external resistor divider. |
| PG | Power-good indicator | Open-drain output asserting high-impedance only when VOUT is within ±5% of target (92–113% VFB window); requires external pull-up. |
| FB | Feedback input | 0.6V reference point for resistive divider; 1–70nA leakage enables high-impedance dividers without accuracy loss. |
| COMP/FSET | Compensation & frequency set | Resistor-to-GND sets both control-loop compensation and switching frequency (1.8–4MHz); tied to GND/VIN selects fixed 2.25MHz. |
| MODE/SYNC | Mode control / clock sync | Pull-low enables PFM/PWM auto-mode; pull-high forces PWM; accepts 1.8–4MHz external clock for synchronized multi-converter systems. |
Key Features
| Feature | Design Value |
|---|---|
| Functional Safety-Capable Documentation | TI provides FIT data, FMEA reports, and safety analysis documentation to support ISO 26262 ASIL-B or IEC 61508 SIL-2 system certification efforts. |
| Active Output Discharge | Internal 100Ω discharge path rapidly collapses VOUT after shutdown - prevents floating rail issues in multi-supply systems and meets strict power-down timing requirements. |
| 100% Duty-Cycle Operation | Enables dropout operation down to VIN ≈ VOUT + 0.1V - critical for battery-powered applications where input voltage decays near output level. |
| Adjustable Soft-Start | Controlled by external capacitor on COMP/FSET; eliminates inrush current and stabilizes startup into large capacitive loads (e.g., FPGA configuration banks). |
| Spread Spectrum Clocking (SSC) | Reduces peak EMI by ±288kHz frequency dithering in PWM mode - simplifies compliance with CISPR-32 Class B conducted/emission limits without added shielding. |
Applications
| Motor Drives | Factory Automation |
|---|---|
Use Scenario: Powering gate drivers and position sensor interfaces in BLDC motor controllers. IC Role / Device Role / Timing Role: Primary 3A POL regulator supplying 3.3V/5V rails for isolated gate drivers and Hall-effect sensors. Use Value: High-current capability and 17µA quiescent current enable efficient operation during motor idle states while supporting fast transient response during commutation events. | Use Scenario: Providing stable 1.8V/3.3V supplies to PLC I/O modules and fieldbus transceivers. IC Role / Device Role / Timing Role: Compact, thermally robust buck converter replacing discrete solutions in DIN-rail mounted controllers. Use Value: SOT583 package and 150°C junction rating ensure reliability in enclosed cabinets with ambient temperatures up to 85°C. |
| Building Automation | Test and Measurement |
Use Scenario: Powering wireless sensor nodes (Zigbee, BLE) and HVAC controller microcontrollers. IC Role / Device Role / Timing Role: Efficient step-down regulator converting 5V USB or 24V PoE-derived supply to 1.2V/1.8V MCU cores. Use Value: 1% feedback accuracy and PFM mode maintain >85% efficiency at 100µA load - extending battery life in self-powered occupancy sensors. | Use Scenario: Generating precision analog supply rails for ADC/DAC front-ends and signal chain biasing. IC Role / Device Role / Timing Role: Low-noise, tightly regulated POL delivering clean 2.5V/3.3V for reference buffers and op-amp stages. Use Value: 1.8–4MHz switching frequency enables small LC filters; power-good output validates rail stability before measurement acquisition begins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS628502DRLR | 2A continuous output current; identical pinout, package, and feature set except lower current limit and reduced ILIMH (2.85–3.9A). | Suitable for lower-power MCU subsystems or dual-rail designs where 3A headroom is unnecessary. | Select when full 3A peak is not required - reduces thermal margin needs and may allow smaller input/output capacitors. |
| TPS62933RQWR | 3A rated, 2.7–6V input, but uses 10-pin 2.0×2.5mm QFN with integrated inductor; higher IQ (25µA), no PG output, no SYNC capability. | Better for space-constrained designs where board area matters more than layout flexibility or system-level synchronization. | Choose when ultra-compact footprint and simplified BOM outweigh need for external frequency sync or power-good signaling. |
Compared with TPS628502DRLR and TPS62933RQWR, the TPS628503DRLR uniquely combines 3A peak capability in the smallest SOT583 package, full MODE/SYNC flexibility for multi-converter timing alignment, and a dedicated open-drain PG output - making it optimal for industrial control systems requiring coordinated power sequencing and thermal resilience.
Availability
TPS628503DRLR is available at Aetrix Electronics and suitable for motor drives, factory automation, and building automation applications requiring stable component supply, long-term manufacturability, and automotive-grade reliability under extended temperature operation.
Supply support for TPS628503DRLR 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 and functional safety design.
The TPS62850x product line was engineered for space-constrained industrial and automation systems needing high-current, high-accuracy, and thermally robust point-of-load regulation - directly addressing demands for smaller footprints, wider input ranges, and enhanced system-level diagnostics.
FAQ
What is the maximum continuous output current supported by the TPS628503DRLR?
The TPS628503DRLR is rated for 2A continuous output current at TJ = 105°C, and 3A peak current at TJ ≤ 85°C. Exceeding these conditions risks thermal shutdown or accelerated lifetime degradation. Derating curves in the datasheet define safe operating area based on PCB copper area and airflow.
Does the TPS628503DRLR support external clock synchronization?
Yes, the TPS628503DRLR supports external clock synchronization via the MODE/SYNC pin, accepting 1.8–4MHz square-wave signals with 20–80% duty cycle. Internal PLL locks to the external clock within 50µs, enabling deterministic phase relationships across multiple converters in complex power trees.
How does the COMP/FSET pin affect both compensation and switching frequency in the TPS628503DRLR?
The COMP/FSET pin sets both control-loop compensation (two configurations) and switching frequency simultaneously via a single resistor to GND. Lower RCF values select compensation setting 1 (optimized for smaller output capacitance), while higher values select setting 2 (for larger COUT and better transient response). Frequency scales inversely with RCF per TI's published equations.
What is the purpose of the power-good (PG) output on the TPS628503DRLR?
The PG output on the TPS628503DRLR is an open-drain window comparator that asserts high-impedance only when VOUT is within 92–113% of the target feedback voltage (VFB = 0.6V). It remains low during startup, thermal shutdown, UVLO, or soft-start - providing reliable system-level power sequencing and fault indication without external circuitry.
Can the TPS628503DRLR operate with 100% duty cycle, and under what conditions?
Yes, the TPS628503DRLR supports 100% duty-cycle operation when VIN drops close to VOUT, enabling dropout operation down to VIN ≈ VOUT + 0.1V. This occurs automatically in PWM mode when the required duty cycle exceeds internal limits - critical for maintaining regulation in battery-powered systems nearing end-of-discharge.
TPS628503DRLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-583
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 3A
- Frequency - Switching:
- 1.8MHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-583
TPS628503DRLR FAQ
1.How can I place an order for TPS628503DRLR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS628503DRLR 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 TPS628503DRLR reliable?
The price and inventory of TPS628503DRLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS628503DRLR is usually 5 days.
3.What payment methods are accepted for TPS628503DRLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS628503DRLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS628503DRLR?
TPS628503DRLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS628503DRLR 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 TPS628503DRLR?
For technical support, including TPS628503DRLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS628503DRLR requirements.
6.How does Aetrix verify that TPS628503DRLR is sourced from the original manufacturer or authorized distributors?
All TPS628503DRLR 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 TPS628503DRLR meets industry standards.
7.What is the process for return or replacement of TPS628503DRLR?
All TPS628503DRLR units undergo pre-shipment inspection (PSI). If there is an issue with TPS628503DRLR, 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 TPS628503DRLR part is unused and in its original packaging.
Return procedure for TPS628503DRLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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