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Texas Instruments TPS73701DRBRM3
- Part No.:
- TPS73701DRBRM3
- Manufacturer:
- Texas Instruments
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
TPS73701DRBRM3.pdf
- Description:
- 1-A, ULTRA-LOW-DROPOUT VOLTAGE R
- Quantity:
- Payment:
- Shipping:
Inventory:2,955
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Product details
Overview
TPS73701DRBRM3 from Texas Instruments is a 1A, adjustable-output low-dropout (LDO) voltage regulator with NMOS pass transistor topology, reverse current protection, 122mV typical dropout at 1A (new silicon), ±1.5% overall accuracy over line/load/temperature, and stable operation with ≥1μF ceramic output capacitor. It serves as a post-regulator for switching supplies and point-of-load supply for FPGAs and microprocessors in portable battery-powered systems.
For engineers reviewing the TPS73701DRBRM3 datasheet, TPS73701DRBRM3 pinout, TPS73701DRBRM3 application, or TPS73701DRBRM3 equivalent, key selection criteria include ultra-low dropout under full load, sub-20nA shutdown current, thermal/foldback current protection, and compatibility with minimal 1μF ceramic output capacitance without ESR constraints.
Technical Context
The TPS73701DRBRM3 implements an NMOS pass transistor in voltage-follower configuration, enabling reverse current blocking and insensitivity to output capacitor ESR-allowing stable regulation with only 1μF ceramic output capacitance. Its BiCMOS process delivers high precision and low ground pin current.
An internal 4MHz charge pump generates gate drive voltage above VOUT, while the feedback (FB) pin enables precise output adjustment from 1.20V to 5.5V using external resistor dividers. The device features foldback current limiting and thermal shutdown for fault protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A maximum continuous-supports high-current digital loads like FPGAs and microprocessors without derating at TJ ≤ 125°C. |
| Dropout Voltage | 122mV typical at 1A (new silicon)-enables regulation from 2.2V input down to 1.2V output with <130mV headroom. |
| Accuracy | ±1.5% over line, load, and temperature (–40°C to 125°C)-ensures reliable power delivery across industrial operating conditions. |
| Shutdown Current | <20nA typical-minimizes battery drain in always-on portable applications during deep sleep modes. |
| Input Voltage Range | 2.2V to 5.5V-compatible with single-cell Li-ion (3.0–4.2V), LiFePO₄ (2.5–3.65V), and 3.3V/5V system rails. |
| Output Noise | 27 × VOUT µVRMS (10Hz–100kHz, COUT = 10µF)-low-noise performance suitable for noise-sensitive analog circuitry when paired with FB capacitor. |
| Thermal Protection | 160°C shutdown / 140°C reset-prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
TPS73701DRBRM3 is housed in an 8-pin VSON (DRB) package measuring 3mm × 3mm with exposed thermal pad (GND-connected). This thermally enhanced leadless package supports high-power-density layouts and requires solder paste stencil optimization for reliable thermal pad attachment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 6) | Unregulated input supply | Accepts 2.2V–5.5V input; must be decoupled locally to suppress upstream switching noise. |
| OUT (Pin 1) | Regulated output | Delivers adjustable 1.20V–5.5V output; requires ≥1μF ceramic capacitor directly at pin for stability. |
| GND (Pins 3,4,Pad) | Ground reference and thermal path | Common return for IN/OUT/EN/FB; exposed pad must be soldered to PCB ground plane for thermal performance. |
| NR/FB (Pin 3) | Feedback input (adjustable version) | Connects to resistor divider (R1+R2=80kΩ) to set VOUT; no NR function-TPS73701 uses FB-only configuration. |
| EN (Pin 5) | Enable control input | Active-high TTL/CMOS-compatible; drives high (≥1.7V) to enable, low (≤0.5V) to enter <20nA shutdown state. |
| N/C (Pins 2,6,7) | No-connect | Internally unconnected; must remain floating or grounded per layout best practices-no routing required. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse current protection | Blocks backflow from OUT to IN (IREV ≤ 0.1µA), eliminating need for external blocking diodes in battery backup paths. |
| Ultra-low IQ in shutdown | 10–20nA typical shutdown current enables multi-year battery life in IoT sensors and wearables. |
| 1μF ceramic capacitor stability | Eliminates ESR dependency-reduces BOM count and board space vs. traditional LDOs requiring tantalum or aluminum electrolytics. |
| Foldback current limit | Reduces short-circuit current as VOUT collapses (e.g., ~510mA at VOUT = 0V), lowering power dissipation during faults. |
| Adjustable output range | 1.20V to 5.5V via external resistor divider-supports diverse core voltages (1.2V FPGA core, 3.3V I/O, 5V peripherals) with one footprint. |
Applications
| Point-of-Load Regulation for FPGAs | Post-Regulation for Switching Supplies |
|---|---|
Use Scenario: Powering Xilinx Artix-7 FPGA core (1.2V) and auxiliary I/O banks (1.8V/3.3V) from a shared 3.3V buck converter rail. IC Role / Device Role / Timing Role: Final-stage LDO delivering clean, low-noise 1.2V core supply with fast transient response to handle dynamic logic switching currents. Use Value: Maintains FPGA core voltage within ±1.5% tolerance during 100mA–1A load steps, preventing timing violations or configuration loss. | Use Scenario: Tightening ripple and noise on the output of a 5V DC/DC buck converter feeding analog signal chain components. IC Role / Device Role / Timing Role: Low-noise post-regulator converting 5V switcher output to 3.3V analog supply, rejecting >37dB of 10kHz switching artifacts. Use Value: Reduces output noise to 90µVRMS (3.3V out), enabling 16-bit ADC performance without additional filtering. |
| Portable Medical Sensors | Industrial PLC I/O Modules |
Use Scenario: Powering ultra-low-power ECG front-end ASIC and BLE radio from a coin-cell battery (2.5–3.0V). IC Role / Device Role / Timing Role: Primary system regulator providing 1.8V and 3.3V rails with <20nA shutdown current during sensor sleep cycles. Use Value: Extends battery life beyond 5 years by minimizing quiescent loss-critical for sealed, non-replaceable medical devices. | Use Scenario: Generating isolated 2.5V reference and 5V logic supply in DIN-rail mounted PLC modules operating from 24V DC bus. IC Role / Device Role / Timing Role: Secondary LDO supplying precision ADC reference and microcontroller I/O, surviving 125°C ambient with thermal shutdown. Use Value: Ensures functional safety compliance by limiting junction temperature to 140°C reset threshold during convection-limited enclosure operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A3701DRBR | 1% overall accuracy (vs. 1.5% for TPS73701DRBRM3); same 1A rating, 125mV dropout, DRB package. | Better accuracy critical for precision ADC references or voltage-controlled oscillators where ±10mV drift is unacceptable. | Select TPS7A3701DRBR when absolute output tolerance is prioritized over cost and ultra-low shutdown current. |
| MCP1826T-1202E/DB | Fixed 1.2V output; 1.5A rating; 350mV dropout at 1.5A; SOT-223-6 package; no EN or reverse current protection. | Suitable for cost-sensitive, fixed-voltage applications where enable control and backfeed prevention are unnecessary. | Choose MCP1826T-1202E/DB only for simple 1.2V loads without sequencing, shutdown, or reverse-blocking requirements. |
Compared with TPS7A3701DRBR and MCP1826T-1202E/DB, TPS73701DRBRM3 uniquely balances adjustable output, reverse current blocking, <20nA shutdown, and 122mV dropout-making it optimal for portable, multi-rail, battery-critical designs where flexibility and protection are mandatory.
Availability
TPS73701DRBRM3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, FPGA point-of-load regulation, and post-regulation for switching supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPS73701DRBRM3 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 LDO design expertise and broad automotive/industrial qualification.
The TPS737 product line was engineered for portable and battery-powered applications demanding ultra-low dropout, reverse current protection, and minimal external components-targeting FPGA, DSP, and microprocessor power delivery.
FAQ
What output voltage range does the TPS73701DRBRM3 support?
The TPS73701DRBRM3 is an adjustable LDO supporting output voltages from 1.20V to 5.5V, set externally via a resistor divider connected to the FB pin. Its internal reference is 1.204V (typical), and the recommended R1 + R2 sum is 80kΩ for optimal accuracy. The TPS73701DRBRM3 does not support fixed-output variants-only the adjustable configuration.
Does the TPS73701DRBRM3 require a minimum output capacitor for stability?
Yes-the TPS73701DRBRM3 is stable with a minimum 1μF ceramic output capacitor and imposes no ESR requirements. This eliminates the need for bulkier, higher-ESR capacitors used in legacy LDOs. Performance improves with larger values (e.g., 10μF reduces RMS noise to ~90µVRMS at 3.3V), but 1μF is sufficient for full 1A load step stability.
How does reverse current protection work in the TPS73701DRBRM3?
The TPS73701DRBRM3 uses an NMOS pass transistor topology that inherently blocks reverse current flow from OUT to IN. When VIN drops below VOUT (e.g., during battery switchover or input brownout), reverse leakage remains ≤0.1µA-preventing backfeeding into upstream supplies and eliminating external blocking diodes in redundant power architectures.
What is the thermal performance of the TPS73701DRBRM3 in its DRB package?
In the 3mm × 3mm VSON (DRB) package, the TPS73701DRBRM3 has a junction-to-ambient thermal resistance (RθJA) of 49.4°C/W (new silicon) with proper PCB layout-requiring the exposed thermal pad to be soldered to a ≥1cm² ground plane with ≥4 thermal vias. At 1A and 122mV dropout, power dissipation is 122mW, resulting in ~6°C junction rise above ambient under optimal cooling.
Can the TPS73701DRBRM3 be used without connecting the EN pin?
No-the EN pin must not be left floating. If unused, TI specifies connecting EN directly to IN to ensure reliable enablement. Leaving EN unconnected risks erratic startup/shutdown behavior due to noise coupling. The pin accepts standard TTL/CMOS logic levels (VEN(high) ≥ 1.7V, VEN(low) ≤ 0.5V) and draws only 20nA when enabled.
TPS73701DRBRM3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.5V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- 1.3 mA
- PSRR:
- 58dB ~ 37dB (100Hz ~ 10kHz)
- Control Features:
- Current Limit, Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SON (3x3)
TPS73701DRBRM3 FAQ
1.How can I place an order for TPS73701DRBRM3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS73701DRBRM3 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 TPS73701DRBRM3 reliable?
The price and inventory of TPS73701DRBRM3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS73701DRBRM3 is usually 5 days.
3.What payment methods are accepted for TPS73701DRBRM3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS73701DRBRM3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS73701DRBRM3?
TPS73701DRBRM3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS73701DRBRM3 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 TPS73701DRBRM3?
For technical support, including TPS73701DRBRM3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS73701DRBRM3 requirements.
6.How does Aetrix verify that TPS73701DRBRM3 is sourced from the original manufacturer or authorized distributors?
All TPS73701DRBRM3 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 TPS73701DRBRM3 meets industry standards.
7.What is the process for return or replacement of TPS73701DRBRM3?
All TPS73701DRBRM3 units undergo pre-shipment inspection (PSI). If there is an issue with TPS73701DRBRM3, 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 TPS73701DRBRM3 part is unused and in its original packaging.
Return procedure for TPS73701DRBRM3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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