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Texas Instruments TPS628438DRLR
- Part No.:
- TPS628438DRLR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-563, SOT-666
- Datasheet:
-
TPS628438DRLR.pdf
- Description:
- IC REG BUCK PROG 600MA SOT563
- Quantity:
- Payment:
- Shipping:
Inventory:3,835
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Product details
Overview
TPS628438DRLR from Texas Instruments is a 1.8V–5.5V input, 1.8V–3.6V adjustable-output synchronous step-down converter delivering 600mA with 275nA typical quiescent current and 1% DC output voltage accuracy in a 1.6mm × 1.6mm SOT563 package. It employs DCS-Control topology for RF-friendly operation and fast transient response, targeting ultra-low-power wearable and hearing aid power rails.
For engineers reviewing the TPS628438DRLR datasheet, TPS628438DRLR pinout, TPS628438DRLR application, or TPS628438DRLR equivalent, key selection criteria include its 275nA IQ at light load, VSET-resistor programmable output (1.8V–3.6V), 1.5MHz nominal switching frequency, integrated output discharge via VOS pin, and compatibility with 1μH inductors and ≥4μF ceramic output capacitors.
Technical Context
The TPS628438DRLR implements TI's DCS-Control architecture-combining hysteretic and voltage-mode control-to enable seamless PFM/PWM mode transition, achieving high PSRR (up to 83dB) and low output ripple even in power-save mode. Its internal R2D (resistor-to-digital) converter reads an external resistor on the VSET pin to select one of 18 pre-defined output voltages within the 1.8V–3.6V range.
It features automatic 100% duty-cycle operation when VIN approaches VOUT, thermal shutdown at 160°C with 20°C hysteresis, cycle-by-cycle overcurrent protection on both high-side (0.9–1.3A) and low-side (0.79–1.11A) MOSFETs, and active output discharge via the VOS pin with 7–22Ω internal switch resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, Li-polymer, or alkaline battery inputs without external regulation. |
| Output Voltage Range | 1.8V to 3.6V - set by external resistor on VSET pin; 18 discrete steps (100mV increments) confirmed for TPS628438 variant. |
| Quiescent Current | 275nA typical - enables multi-year battery life in always-on wearables and medical patches drawing microampere loads. |
| Output Current | 600mA - sufficient for powering Bluetooth LE SoCs, MEMS sensors, or low-power DSPs in compact devices. |
| Switching Frequency | 1.5MHz nominal - allows use of tiny 1μH inductors and minimizes EMI in noise-sensitive RF sections. |
| Output Accuracy | ±1% over –20°C to +125°C - ensures stable core or I/O rail voltage for precision analog or digital circuitry. |
| Shutdown Current | 4nA typical - eliminates standby leakage in systems requiring true zero-power off-state. |
Pinout & Package
TPS628438DRLR uses a 6-pin SOT563 package (1.60mm × 1.60mm × 0.6mm body), optimized for space-constrained PCB layouts with top-layer routing for CIN, COUT, and L. Pin functions are validated per TI SLVSFU8C Rev JUNE 2024.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power ground reference | Mandatory low-impedance connection to input/output capacitor GND pads; critical for noise suppression and thermal dissipation. |
| VIN (Pin 2) | Main power input | Connects directly to input capacitor (≥0.5μF ceramic); must be routed short and wide to minimize voltage spikes and EMI. |
| VSET (Pin 3) | Voltage selection interface | Accepts external resistor to GND; internal R2D converter detects value to configure feedback divider for precise 1.8V–3.6V output. |
| EN (Pin 4) | Enable control input | Active-high logic input (0.8V threshold); includes internal 425–500kΩ pulldown to prevent floating start-up; disables converter and activates output discharge. |
| SW (Pin 5) | Switch node | Connects to inductor; carries high di/dt switching current; requires tight layout with minimal trace length to reduce EMI and losses. |
| VOS (Pin 6) | Output voltage sense & discharge | Direct connection point to output capacitor; provides feedback for regulation and enables internal MOSFET discharge path (7–22Ω) when disabled. |
Key Features
| Feature | Design Value |
|---|---|
| DCS-Control topology | Enables <100μA light-load efficiency retention, sub-10μs transient response, and RF-compatible low-ripple operation without external compensation. |
| VSET resistor programming | Single external E96 1% resistor selects exact output voltage (e.g., 10kΩ = 1.8V, 249kΩ = 3.4V); no trimming or DAC required. |
| Integrated output discharge | VOS pin drives internal 7–22Ω discharge FET when EN = low, ensuring rapid, controlled VOUT ramp-down to near 0V for system sequencing. |
| Ultra-low IQ architecture | 275nA operating IQ achieved via ultra-low-power reference, high-impedance feedback network, and optimized PFM sleep logic. |
| 100% duty-cycle mode | Extends regulation down to VIN–VOUT < 100mV, enabling efficient operation near battery end-of-life (e.g., 3.2V input → 3.1V output). |
Applications
| Wearable Sensor Nodes | Hearing Aid Signal Chain |
|---|---|
|
Use Scenario: Continuous monitoring of physiological signals (ECG, SpO₂) using ultra-low-power analog front-ends and BLE transceivers. IC Role / Device Role / Timing Role: Primary power regulator supplying 2.8V/3.3V to sensor ADCs and radio SoCs during active and deep-sleep states. Use Value: 275nA IQ extends coin-cell battery life beyond 2 years; 1.5MHz switching avoids interference with 2.4GHz BLE band. |
Use Scenario: Miniaturized in-ear hearing aids requiring stable, low-noise bias for MEMS microphones and audio DSPs. IC Role / Device Role / Timing Role: Core supply rail generator delivering regulated 1.8V/2.5V with <1% accuracy and <10mV ripple under dynamic audio loads. Use Value: High PSRR (83dB) suppresses switching noise from affecting sensitive analog audio paths; VOS discharge prevents pop/click at power-off. |
| Wireless Earbud Charging Case | Medical Patch Telemetry |
|
Use Scenario: Power management inside compact charging cases that condition and deliver charge to earbuds while managing own battery state. IC Role / Device Role / Timing Role: Secondary buck regulator stepping down 5V USB input to 3.6V for charging IC or MCU logic supply. Use Value: 600mA output supports fast wake-up and firmware updates; SOT563 footprint fits tight 3D cavity layouts with minimal board area. |
Use Scenario: Disposable, skin-adhesive telemetry patches transmitting vital signs via NB-IoT or LTE-M over multi-day deployments. IC Role / Device Role / Timing Role: Single-rail converter powering ultra-low-power MCU, cellular modem, and analog sensor interface from primary lithium battery. Use Value: 4nA shutdown current eliminates parasitic drain during transport/storage; 1.8V–3.6V range matches optimal modem supply requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DRLR | Same 275nA IQ and SOT563 package, but fixed 1.8V output (no VSET pin); lacks output discharge and VOS pin. | Suitable only where fixed 1.8V is acceptable; cannot support variable rail needs like 2.5V or 3.3V without redesign. | Select TPS62840DRLR only if output voltage is invariant and output discharge is unnecessary. |
| TPS62864DRLR | Higher 1A output, same 275nA IQ, identical VSET programming and VOS discharge, but requires larger 2.0mm × 2.0mm QFN package. | Better suited for higher-current subsystems (e.g., camera modules), but increases PCB area and thermal mass. | Choose TPS62864DRLR when >600mA peak load is expected and board space permits larger footprint. |
Compared with TPS62840DRLR and TPS62864DRLR, the TPS628438DRLR uniquely balances programmable 1.8V–3.6V output, integrated discharge, and minimal 1.6mm × 1.6mm size-making it optimal for space- and flexibility-constrained ultra-low-power designs where rail agility matters.
Availability
TPS628438DRLR is available at Aetrix Electronics and suitable for wearable electronics, hearing aids, and medical sensor patches requiring stable component supply with long-term lifecycle assurance and consistent parametric performance.
Supply support for TPS628438DRLR 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 technologies, with decades of expertise in high-efficiency DC/DC conversion.
The TPS62843 family was designed specifically for battery-powered edge devices demanding nanoscale quiescent current, minimal solution size, and robust RF coexistence-targeting next-generation wearables, hearables, and disposable medical electronics.
FAQ
What is the maximum output voltage supported by the TPS628438DRLR?
The TPS628438DRLR supports a maximum output voltage of 3.6V, as confirmed by TI's device comparison table and electrical characteristics section. This upper limit applies specifically to the TPS628438 variant and is selected via the VSET pin resistor; values above 3.6V are not supported and may cause regulation failure or damage.
Does the TPS628438DRLR require an external feedback resistor divider?
No, the TPS628438DRLR does not require an external feedback resistor divider. Output voltage is set solely by a single resistor between VSET and GND; the internal R2D converter configures the feedback network digitally. The VOS pin connects directly to the output capacitor for sensing and discharge-no external resistors are used in the regulation loop.
Can the TPS628438DRLR operate with a 0.7μH inductor?
Yes, the TPS628438DRLR supports inductors from 0.7μH to 1.2μH per Section 6.3 Recommended Operating Conditions. A 0.7μH inductor is valid and may improve transient response at the cost of slightly higher peak current; ensure saturation current rating exceeds 1.3A to accommodate overcurrent limits.
How does the output discharge function work on the TPS628438DRLR?
The TPS628438DRLR activates output discharge automatically when EN is pulled low, connecting an internal 7–22Ω MOSFET between VOS and GND. This discharges the output capacitor rapidly and controllably-verified in Figure 8-27 of the datasheet-ensuring VOUT falls to near 0V without external components or timing dependencies.
Is the TPS628438DRLR pin-compatible with the TPS6280x family?
Yes, the TPS628438DRLR is pin-to-pin compatible with the TPS6280x family (e.g., TPS62806, TPS62808) in the same SOT563 package, as explicitly stated in the Features section. This allows direct substitution in existing layouts when upgrading from 1A to 600mA capability or leveraging lower IQ.
TPS628438DRLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-563, SOT-666
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 3.6V
- Current - Output:
- 600mA
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-563
TPS628438DRLR FAQ
1.How can I place an order for TPS628438DRLR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS628438DRLR 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 TPS628438DRLR reliable?
The price and inventory of TPS628438DRLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS628438DRLR is usually 5 days.
3.What payment methods are accepted for TPS628438DRLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS628438DRLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS628438DRLR?
TPS628438DRLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS628438DRLR 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 TPS628438DRLR?
For technical support, including TPS628438DRLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS628438DRLR requirements.
6.How does Aetrix verify that TPS628438DRLR is sourced from the original manufacturer or authorized distributors?
All TPS628438DRLR 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 TPS628438DRLR meets industry standards.
7.What is the process for return or replacement of TPS628438DRLR?
All TPS628438DRLR units undergo pre-shipment inspection (PSI). If there is an issue with TPS628438DRLR, 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 TPS628438DRLR part is unused and in its original packaging.
Return procedure for TPS628438DRLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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