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Texas Instruments TPS628437DRLR
- Part No.:
- TPS628437DRLR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-563, SOT-666
- Datasheet:
-
TPS628437DRLR.pdf
- Description:
- IC REG BUCK PROG 600MA SOT563
- Quantity:
- Payment:
- Shipping:
Inventory:3,294
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Product details
Overview
TPS628437DRLR from Texas Instruments is a 600mA, ultra-low-quiescent-current (275nA typical) synchronous step-down converter in a 1.60mm × 1.60mm SOT563 package, delivering 0.8V–1.8V output from 1.8V–5.5V input. It employs DCS-Control topology for RF-friendly operation, supports 1μH inductors and ≥4μF output capacitance, and targets battery-powered wearable and hearing aid systems requiring long runtime and minimal solution size.
For engineers reviewing the TPS628437DRLR datasheet, TPS628437DRLR pinout, TPS628437DRLR application, or TPS628437DRLR equivalent, key selection criteria include its 275nA IQ at light load, VSET-resistor programmable output voltage, integrated output discharge via VOS pin, 1.5MHz nominal switching frequency, and compatibility with 0402/0603 passive components for space-constrained designs.
Technical Context
The TPS628437DRLR implements TI's DCS-Control architecture-combining hysteretic and voltage-mode control-to achieve seamless PFM/PWM transition, <10mV output ripple in power-save mode, and fast transient response without external compensation. Its R2D (resistor-to-digital) converter reads an external resistor on the VSET pin to select one of 18 pre-defined output voltages within the 0.8V–1.6V range (50mV steps), decoupling accuracy from resistor tolerance.
It integrates high-side (170–260mΩ) and low-side (70–115mΩ) MOSFETs, features 4nA shutdown current, thermal shutdown at 160°C with 20°C hysteresis, and active output discharge via a 7–22Ω internal switch on the VOS pin. The device operates down to 100μA load while maintaining >80% efficiency and delivers up to 83dB PSRR at 10kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, Li-polymer, and multi-cell alkaline/NiMH batteries without pre-regulation. |
| Output Voltage Range | 0.8V to 1.8V - selectable via external resistor on VSET pin; 18 discrete values in 50mV increments for precise rail matching. |
| Quiescent Current | 275nA typical - enables >1-year battery life in always-on wearable sensors drawing ~10μA average load. |
| Max Output Current | 600mA - sufficient for RF transceivers, DSP cores, and low-power microcontrollers in compact audio devices. |
| Switching Frequency | 1.5MHz nominal - allows use of tiny 1μH inductors and minimizes EMI in noise-sensitive audio/headset applications. |
| Output Accuracy | ±1% over –20°C to +125°C - ensures stable core voltage for precision analog front-ends and ADCs in medical patches. |
| Shutdown Current | 4nA typical - eliminates standby drain in hearing aids during sleep mode or case-closed state. |
Pinout & Package
TPS628437DRLR uses the 6-pin SOT563 (DRL) package: 1.60mm × 1.60mm × 0.6mm body, 0.95mm pitch, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power ground reference | Must be connected directly to PCB ground plane near CIN/COUT; serves as return path for all internal power and feedback circuits. |
| VIN (Pin 2) | Main input power supply | Accepts 1.8V–5.5V; requires local 4.7μF ceramic capacitor placed adjacent to minimize high-frequency noise and voltage spikes. |
| VSET (Pin 3) | Voltage selection interface | Connects to GND via E96 1% resistor (10kΩ–249kΩ) to program output; no current flows after R2D conversion completes. |
| EN (Pin 4) | Enable control input | Active-high logic; internal 425–500kΩ pulldown prevents floating start-up; threshold is 0.8V rising / 0.4V falling. |
| SW (Pin 5) | Switch node | Drives external 1μH inductor; high dv/dt node requiring short, low-inductance trace to minimize EMI and ringing. |
| VOS (Pin 6) | Output voltage sense & discharge | Direct connection to COUT anode; provides feedback for regulation and activates 7–22Ω discharge path when EN = low. |
Key Features
| Feature | Design Value |
|---|---|
| DCS-Control topology | Enables simultaneous high PSRR (83dB), low output ripple (<10mV), and sub-μA quiescent current without external compensation. |
| VSET resistor programming | Eliminates need for external feedback resistors; supports 18 factory-trimmed output voltages with ±1% DC accuracy. |
| Integrated output discharge | Prevents residual voltage hold-up on VOUT during shutdown-critical for safe power sequencing in multi-rail wearables. |
| 100% duty-cycle mode | Maintains regulation when VIN approaches VOUT (e.g., 1.8V input → 1.6V output), extending usable battery voltage range. |
| RF-friendly operation | Fixed 1.5MHz switching frequency avoids sensitive ISM bands; PFM/PWM transition occurs seamlessly without audible noise. |
Applications
| Wearable Sensor Nodes | Hearing Aid Processors |
|---|---|
|
Use Scenario: Continuous glucose monitoring patch powered by coin-cell battery with 24/7 Bluetooth LE beaconing. IC Role / Device Role / Timing Role: Primary power regulator supplying 1.2V to ultra-low-power MCU and analog sensor front-end. Use Value: 275nA IQ extends battery life beyond 12 months; 0.84mm² solution size (with 0402 caps/0603 inductor) fits sub-1cm² PCB area. |
Use Scenario: Rechargeable in-the-ear (ITE) hearing aid with real-time noise suppression and wireless streaming. IC Role / Device Role / Timing Role: Core voltage regulator for DSP and Class-D amplifier, enabling dynamic voltage scaling during active vs idle states. Use Value: 4nA shutdown current prevents battery drain during storage; VSET-programmability allows single BOM for multiple output variants (1.0V/1.2V/1.5V). |
| Wireless Headsets | Medical Sensor Patches |
|
Use Scenario: True wireless stereo (TWS) earbud with ANC, touch control, and voice assistant-operating from 40mAh Li-poly battery. IC Role / Device Role / Timing Role: Secondary buck supplying 1.8V to Bluetooth SoC RF section, isolated from noisy digital rails. Use Value: 83dB PSRR rejects noise from digital switching; 1.5MHz operation avoids interference with 2.4GHz band; output discharge prevents latch-up during fast power cycling. |
Use Scenario: Disposable ECG patch worn for 7-day continuous cardiac monitoring using printed battery. IC Role / Device Role / Timing Role: Single-stage regulator converting 3.0V printed battery output to stable 0.9V for ultra-low-power ASIC. Use Value: Supports 1μH inductor and 4μF effective COUT-enabling smallest possible bill-of-materials and lowest assembly cost for high-volume disposables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS628437YKAR | Same IC die in 0.84mm² DSBGA (YKA) package; 0.35mm pitch, 0.80mm × 1.05mm footprint. | Requires finer-pitch assembly and underfill for reliability; better thermal resistance (RθJA = 147.7°C/W vs 138.3°C/W). | Select YKAR for ultra-miniature designs where board area is more constrained than assembly capability. |
| TPS6286415DRLR | Higher 1.2A output, 300nA IQ, same SOT563 package-but fixed 1.5V output, no VSET programming. | Lacks output voltage flexibility; suited only for fixed-rail applications like memory I/O or specific PMIC domains. | Choose DRLR only if 1.5V is sufficient and higher current headroom justifies slightly higher IQ and loss of programmability. |
Compared with TPS628437YKAR, the TPS628437DRLR offers easier manufacturability and lower thermal resistance; compared with TPS6286415DRLR, it trades fixed output for programmability and lower max current-making it optimal for multi-voltage wearable platforms needing design reuse across variants.
Availability
TPS628437DRLR is available at Aetrix Electronics and suitable for wearable electronics, hearing aids, and medical sensor patches requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS628437DRLR 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 and ultra-low-power system design.
The TPS62843 family was engineered specifically for space- and energy-constrained portable medical and audio devices, prioritizing nanoscale quiescent current, minimal external component count, and robust operation across wide temperature and load ranges.
FAQ
What is the exact output voltage range supported by TPS628437DRLR?
The TPS628437DRLR supports an output voltage range of 0.8V to 1.8V, selectable in 50mV increments via an external resistor on the VSET pin. This corresponds to 18 discrete values (e.g., 0.80V, 0.85V, ..., 1.60V), with ±1% DC accuracy over –20°C to +125°C. The device does not support voltages below 0.8V or above 1.8V-those ranges require TPS628436 or TPS628438 variants.
Does TPS628437DRLR require external feedback resistors?
No, the TPS628437DRLR eliminates external feedback resistors through its integrated R2D (resistor-to-digital) converter. A single E96 1% resistor (10kΩ–249kΩ) connected between VSET and GND selects the output voltage. The resistor value is read during startup, then disconnected from the bias network-ensuring no current draw or accuracy degradation from resistor tolerance or temperature drift.
How does the output discharge function work on TPS628437DRLR?
The TPS628437DRLR activates output discharge automatically when the EN pin is pulled low. An internal 7–22Ω MOSFET connects the VOS pin to GND, rapidly discharging the output capacitor. This ensures VOUT falls cleanly to near 0V within milliseconds-preventing unintended wake-up of downstream circuitry and enabling safe, predictable power sequencing in multi-rail wearable systems.
Can TPS628437DRLR operate with input voltage close to the output voltage?
Yes, the TPS628437DRLR enters 100% duty-cycle mode when VIN approaches VOUT, keeping the high-side MOSFET continuously on to maintain regulation. For example, it sustains 1.6V output down to ~1.7V input-extending usable battery voltage range and maximizing energy extraction from aging or low-charge cells in hearing aids and earbuds.
What passive components are recommended for TPS628437DRLR?
Texas Instruments specifies a 1μH shielded inductor (e.g., Murata DFE201610-1R0M) and ≥4μF total effective output capacitance (e.g., 10μF 0402 ceramic). Input capacitance requires ≥0.5μF (4.7μF typical), and the VSET resistor must be E96 1% with ≤30pF parasitic capacitance to GND. All components are optimized for 0402/0603 footprints to match the TPS628437DRLR's compact SOT563 layout.
TPS628437DRLR 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):
- 0.8V
- Voltage - Output (Max):
- 1.8V
- 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
TPS628437DRLR FAQ
1.How can I place an order for TPS628437DRLR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS628437DRLR 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 TPS628437DRLR reliable?
The price and inventory of TPS628437DRLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS628437DRLR is usually 5 days.
3.What payment methods are accepted for TPS628437DRLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS628437DRLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS628437DRLR?
TPS628437DRLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS628437DRLR 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 TPS628437DRLR?
For technical support, including TPS628437DRLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS628437DRLR requirements.
6.How does Aetrix verify that TPS628437DRLR is sourced from the original manufacturer or authorized distributors?
All TPS628437DRLR 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 TPS628437DRLR meets industry standards.
7.What is the process for return or replacement of TPS628437DRLR?
All TPS628437DRLR units undergo pre-shipment inspection (PSI). If there is an issue with TPS628437DRLR, 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 TPS628437DRLR part is unused and in its original packaging.
Return procedure for TPS628437DRLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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