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Texas Instruments TPS61261DRVT
- Part No.:
- TPS61261DRVT
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
TPS61261DRVT.pdf
- Description:
- IC REG BOOST 3.3V 100MA 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,245
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Product details
Overview
TPS61261DRVT from Texas Instruments is a 3.3-V fixed-output synchronous boost converter IC designed for ultra-low-input-voltage battery-powered systems. It operates from 0.8 V to 4.0 V input, delivers up to 100 mA output current at 3.3 V, features programmable average output current (10–100 mA), 29-µA quiescent current, and integrates output overvoltage protection and load disconnect during shutdown - enabling coin-cell and single/dual alkaline/NiMH-powered medical sensors and laser pointers.
For engineers reviewing the TPS61261DRVT datasheet, TPS61261DRVT pinout, TPS61261DRVT application, or TPS61261DRVT equivalent, key selection considerations include its 2.5-MHz quasi-fixed-frequency PWM operation, RI-pin-based current programming, WSON-6 package thermal performance (RθJA = 89°C/W), and compatibility with high-impedance batteries requiring advanced softstart and undervoltage lockout (UVLO = 0.7 V typical).
Technical Context
The TPS61261DRVT implements a current-mode, quasi-fixed-frequency (2.5 MHz) PWM controller with synchronous rectification using three internal N-channel MOSFETs. Its dual-loop architecture regulates either output voltage or average output current - whichever demands lower power - with feedforward compensation for fast transient response to input/output voltage changes.
It supports Power Save Mode below discontinuous conduction threshold to maintain >90% efficiency at light loads, while enforcing strict 3.3 V ±1.5% output regulation (VFB = 500 mV ±5 mV) and limiting peak switch current via RI-pin resistor programming (2 kΩ–20 kΩ). Shutdown disconnects load from VIN, and UVLO (0.7 V typ.) prevents startup below usable battery voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V (±1.5%) - eliminates external feedback divider; ensures stable rail for low-power MCUs and sensors. |
| Input Voltage Range | 0.8 V to 4.0 V - supports deep-discharge alkaline/NiMH and coin cells (e.g., CR2032 down to 0.8 V). |
| Avg. Output Current | Programmable 10–100 mA via RI pin - enables optimization of inductor size and efficiency for specific load profiles. |
| Quiescent Current | 29 µA - minimizes battery drain in standby, critical for multi-year battery life in portable medical devices. |
| Switching Frequency | Quasi-fixed 2.5 MHz - allows use of small 4.7-µH inductors and 10-µF ceramic capacitors; reduces solution footprint. |
| Efficiency | Up to 95% at 3.3 V/50 mA (VIN = 1.2 V) - maximizes energy extraction from weak batteries without thermal derating. |
| UVLO Threshold | 0.7 V (typ.), 200-mV hysteresis - prevents erratic operation during battery sag and enables clean restart after recovery. |
| OVP Threshold | 4.0–4.5 V - protects downstream circuitry if feedback fails or output capacitor degrades. |
Pinout & Package
TPS61261DRVT is housed in a thermally enhanced 2.00 mm × 2.00 mm, 6-pin WSON (DRV) package with exposed thermal pad soldered to PCB ground for optimal power dissipation (RθJC(bot) = 8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RI (Pin 1) | Average output current programming input | Resistor to GND sets regulated output current (10–100 mA); determines max switch current and inductor saturation margin. |
| EN (Pin 2) | Enable control input | Active-high logic; pulls device into full shutdown (ISD < 0.3 µA) and disconnects load from VIN when low. |
| FB (Pin 3) | Feedback sense node | Internally connected to 3.3 V reference; must be shorted to VOUT for fixed-output operation - no external resistors required. |
| VOUT (Pin 4) | Regulated boost output | Delivers 3.3 V to load; includes overvoltage protection and load disconnect during EN = low. |
| L (Pin 5) | Inductor connection | Drives external 4.7-µH inductor; carries pulsed switch current up to 700 mA peak (at 100 mA avg. output). |
| VIN (Pin 6) | Input supply for control stage | Accepts 0.8–4.0 V battery input; powers internal bias circuits and gate drivers - independent of L-pin switching node. |
| Exposed Thermal Pad | Ground and thermal interface | Must be soldered to PCB GND plane to achieve RθJA = 89°C/W and ensure reliability at 100 mA continuous load. |
Key Features
| Feature | Design Value |
|---|---|
| Advanced softstart | Ramps output current from zero to programmed value as VOUT rises to ~0.4 V - prevents inrush into pre-biased outputs and avoids input voltage droop on weak batteries. |
| Synchronous 3-switch topology | Enables true load disconnect during shutdown and linear-mode startup when VIN > VOUT - eliminates reverse leakage and improves system safety. |
| Power Save Mode | Reduces switching frequency and disables non-essential blocks below discontinuous conduction - maintains >85% efficiency at 1 mA load. |
| Output overvoltage protection | Halts switching if VOUT exceeds 4.0 V - safeguards connected microcontrollers, LEDs, or RF transceivers from overvoltage damage. |
| Undervoltage lockout | Disables regulator when VIN falls below 0.7 V (typ.) - prevents brownout operation and preserves remaining battery capacity. |
| 2.5-MHz quasi-fixed frequency | Minimizes EMI spread while enabling compact 0603-size magnetics and ceramics - ideal for space-constrained wearables and hearing aids. |
Applications
| Personal Medical Sensors | Laser Pointers |
|---|---|
Use Scenario: Continuous glucose monitor powered by a single CR2032 coin cell with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Primary 3.3-V power rail generator that starts reliably at 0.8 V and sustains 15 mA peak sensor readout current. Use Value: 29-µA quiescent current and UVLO hysteresis extend usable battery life by >30% versus legacy boosters; WSON-6 footprint fits sub-100-mm² PCB area. |
Use Scenario: Class II laser module requiring stable 3.3 V for driver IC and red diode bias, operating from two AAA alkaline cells. IC Role / Device Role / Timing Role: Fixed-output boost regulator delivering regulated 3.3 V even as battery decays from 3.0 V to 1.2 V. Use Value: Programmable current limit (via RI) prevents diode overcurrent during cold-start; OVP guards against accidental open-circuit failure. |
| Wireless Headsets | Industrial Metering Sensors |
Use Scenario: Bluetooth LE earbud with intermittent 50-mA RF transmit bursts and 20-µA sleep current. IC Role / Device Role / Timing Role: Efficient 3.3-V supply supporting dynamic load transitions between sleep and active modes without output droop. Use Value: Quasi-fixed 2.5-MHz switching enables tight output regulation (<0.5% load line regulation) and fast transient response (<10 µs to settle). |
Use Scenario: Battery-backed smart water meter using NiMH cells in harsh temperature environments (–40°C to +85°C). IC Role / Device Role / Timing Role: Robust boost converter maintaining 3.3 V for MCU and RF transceiver across full temperature and input range. Use Value: Guaranteed operation down to –40°C with 0.7-V UVLO and 125°C junction rating ensures field reliability; thermal pad enables passive cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61260DRVT | Adjustable output (1.8–4.0 V) via external resistor divider; FB pin requires external connection; same package and pinout. | Used where variable rail voltage is needed (e.g., multiple peripherals with different VDD requirements); adds two resistors and layout complexity. | Select TPS61260DRVT only if adjustable output is required - TPS61261DRVT saves BOM cost and layout area with factory-trimmed 3.3 V. |
| MAX17222ETA+T | Fixed 3.3 V output, 0.4-V min. input, 100-mA output, but uses 1.13-mm × 0.93-mm 6-bump WLP; no RI pin for current programming. | Better suited for ultra-miniature designs (e.g., ingestible sensors); lacks programmable current limit and advanced softstart. | Choose MAX17222ETA+T for smallest footprint; retain TPS61261DRVT when RI-based current control, thermal pad, or coin-cell softstart are mandatory. |
Compared with TPS61260DRVT, the TPS61261DRVT eliminates external feedback components and simplifies design validation; versus MAX17222ETA+T, it offers superior thermal management, programmable current limiting, and proven softstart for high-impedance batteries - making it optimal for industrial and medical applications demanding robustness and long-term supply stability.
Availability
TPS61261DRVT is available at Aetrix Electronics and suitable for personal medical sensors, wireless headsets, laser pointers, industrial metering sensors, and coin-cell-powered IoT edge nodes requiring stable component supply with guaranteed long-term manufacturability.
Supply support for TPS61261DRVT 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 battery-powered system solutions.
The TPS6126x product line was engineered specifically for ultra-low-input-voltage boost conversion in space- and energy-constrained portable electronics - emphasizing efficiency at micropower loads, reliable startup from depleted batteries, and integrated protection for safety-critical applications.
FAQ
What is the minimum input voltage required for TPS61261DRVT to start up and regulate?
The TPS61261DRVT has an undervoltage lockout (UVLO) threshold of 0.7 V typical, with 200-mV hysteresis. Startup occurs when VIN rises above 0.7 V, and regulation is maintained down to 0.8 V input under load. The datasheet specifies minimum startup voltage as 1.2 V at –40°C to 105°C junction temperature, ensuring robust cold-temperature operation. This makes TPS61261DRVT suitable for deeply discharged alkaline and NiMH cells.
Does TPS61261DRVT require external feedback resistors to set its 3.3-V output?
No, the TPS61261DRVT is a fixed-output variant - its 3.3-V regulation is achieved using an internal trimmed resistor divider. The FB pin must be directly connected to VOUT (shorted), not used with external resistors. This eliminates component count, layout sensitivity, and tolerance drift, distinguishing it from the adjustable TPS61260DRVT. The internal reference is tightly controlled at 500 mV ±5 mV.
How is average output current programmed on the TPS61261DRVT?
Average output current on the TPS61261DRVT is programmed by connecting a resistor (RRI) between the RI pin and GND. With RRI = 10 kΩ, typical output current is 20 mA; values from 2 kΩ to 20 kΩ yield 10–100 mA. The RI pin voltage is regulated to 400 mV, so IOUT(avg) ≈ 400 mV / RRI. This feature allows precise current limiting for LED drivers or sensor biasing without external sense resistors.
What happens to the load during shutdown of the TPS61261DRVT?
When EN is pulled low, the TPS61261DRVT enters full shutdown: switching stops, internal control circuitry powers down, and the load is actively disconnected from VIN via internal switches. This prevents reverse current flow and ensures VOUT collapses safely - critical for systems where back-powering or leakage could disrupt MCU state or drain backup batteries. Shutdown current is <0.3 µA at 25°C.
Can the TPS61261DRVT operate with a 4.7-µH inductor and 10-µF output capacitor as shown in the typical application?
Yes - the TPS61261DRVT is fully characterized with a 4.7-µH shielded inductor (e.g., Murata LQM2HPN4R7MG0) and two 10-µF X5R ceramic capacitors (C1 and C2). This combination achieves stable regulation, <1% output ripple, and >95% efficiency at 50 mA. Layout guidelines emphasize short, low-inductance paths for VIN, VOUT, and L pins, and mandatory soldering of the exposed thermal pad to GND for thermal integrity.
TPS61261DRVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.8V
- Voltage - Input (Max):
- 4V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 100mA
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (2x2)
TPS61261DRVT FAQ
1.How can I place an order for TPS61261DRVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61261DRVT 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 TPS61261DRVT reliable?
The price and inventory of TPS61261DRVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61261DRVT is usually 5 days.
3.What payment methods are accepted for TPS61261DRVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61261DRVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61261DRVT?
TPS61261DRVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61261DRVT 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 TPS61261DRVT?
For technical support, including TPS61261DRVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61261DRVT requirements.
6.How does Aetrix verify that TPS61261DRVT is sourced from the original manufacturer or authorized distributors?
All TPS61261DRVT 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 TPS61261DRVT meets industry standards.
7.What is the process for return or replacement of TPS61261DRVT?
All TPS61261DRVT units undergo pre-shipment inspection (PSI). If there is an issue with TPS61261DRVT, 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 TPS61261DRVT part is unused and in its original packaging.
Return procedure for TPS61261DRVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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