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Texas Instruments TLV74312PDQNR
- Part No.:
- TLV74312PDQNR
- Manufacturer:
- Texas Instruments
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
TLV74312PDQNR.pdf
- Description:
- IC REG LINEAR 1.2V 300MA 4X2SON
- Quantity:
- Payment:
- Shipping:
Inventory:9,674
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Product details
Overview
TLV74312PDQNR from Texas Instruments is a 1.2-V fixed-output, 300-mA low-dropout linear regulator (LDO) in a 4-pin X2SON package (1.0 mm × 1.0 mm). It operates from 1.4 V to 5.5 V input, delivers 1% typical output accuracy, achieves 125 mV dropout at 300 mA (for 3.3 V version), and features active output discharge with 120-Ω pulldown. It powers core rails in space-constrained portable electronics such as camera modules and WLAN add-on cards.
For engineers reviewing the TLV74312PDQNR datasheet, TLV74312PDQNR pinout, TLV74312PDQNR application, or TLV74312PDQNR equivalent, key selection criteria include ultra-small footprint, 34 µA quiescent current, foldback overcurrent protection, stable operation with 1-µF ceramic output capacitor, and thermal shutdown at 160°C - all critical for battery-powered, thermally sensitive designs.
Technical Context
The TLV74312PDQNR uses a PMOS pass transistor architecture enabling low dropout and inherent reverse-current blocking. Its undervoltage lockout (UVLO) activates below 1.25 V (falling) and releases above 1.3 V (rising), preventing erratic startup behavior during brownout conditions.
Functional modes include normal regulation, dropout (where VOUT = VIN − VDO), and disabled state with active pulldown. The device implements foldback current limiting - reducing output current as VOUT collapses - and thermal shutdown cycling between 140°C (reset) and 160°C (trip), protecting against sustained overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±1.4% (max) over –40°C to +125°C - ensures stable core supply for low-voltage logic and sensors. |
| Max Output Current | 300 mA continuous - supports moderate-power peripherals without external current boosting. |
| Dropout Voltage | 450 mV at 300 mA, –40°C to +125°C - enables operation with minimal headroom (e.g., 1.65 V input for 1.2 V output). |
| Quiescent Current | 34 µA typical - extends battery life in always-on or low-duty-cycle applications. |
| PSRR | 68 dB at 100 Hz (1.8 V output, 300 mA load) - suppresses low-frequency noise from noisy DC/DC stages. |
| Enable Threshold | VEN(HI) ≥ 0.9 V, VEN(LO) ≤ 0.35 V - compatible with 1.2-V, 1.8-V, and 3.3-V GPIOs without level-shifting. |
| Thermal Shutdown | Trips at 160°C, resets at 140°C - provides self-protecting operation under sustained overload or poor PCB thermal design. |
Pinout & Package
TLV74312PDQNR is housed in a 4-pin, 1.0 mm × 1.0 mm X2SON package with exposed thermal pad electrically tied to GND. The compact footprint supports high-density layouts in mobile and wearable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated output | Delivers stable 1.2 V; requires 1-µF ceramic capacitor to ground for stability and transient response. |
| 2 (GND) | Ground reference | Common return path; thermal pad must be soldered to PCB GND plane for thermal performance (RθJB = 164.9°C/W). |
| 3 (EN) | Active-high enable | Drives >0.9 V to enable; <0.35 V to disable; no internal pull-down - must be actively driven or tied to IN. |
| 4 (IN) | Input supply | Accepts 1.4–5.5 V; recommended 1-µF ceramic capacitor to GND minimizes input ripple and improves PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small X2SON package | 1.0 mm × 1.0 mm footprint with thermal pad - enables placement in <2 mm² board area, ideal for camera modules and SIM card slots. |
| Stable with 1-µF output capacitor | Eliminates need for larger, costly tantalum or polymer caps - reduces BOM cost and simplifies layout in space-limited designs. |
| Foldback overcurrent protection | Limits short-circuit current to ~150 mA at 1.2 V output - prevents thermal runaway while allowing safe recovery after fault removal. |
| Active output discharge | 120-Ω pulldown resistor engages on disable - discharges output within microseconds (τ ≈ 120 Ω × COUT), preventing floating or back-powering of downstream circuitry. |
| Low IQ and high PSRR | 34 µA quiescent current + 68 dB PSRR at 100 Hz - preserves battery runtime while rejecting noise from switching regulators feeding the LDO input. |
Applications
| Camera Module Power | WLAN Add-On Card Rail |
|---|---|
|
Use Scenario: Powers image sensor and ISP core logic in smartphone front/rear cameras where board space and thermal headroom are severely constrained. IC Role / Device Role / Timing Role: Primary 1.2-V core LDO delivering clean, regulated voltage with fast load transient response to handle burst-mode sensor readout. Use Value: 1-µF stability and 34 µA IQ minimize power loss and heat generation, enabling reliable operation inside sealed camera housings. |
Use Scenario: Supplies 1.2-V logic rail for PCIe-based Wi-Fi/BT combo modules on notebook motherboard daughterboards. IC Role / Device Role / Timing Role: Point-of-load regulator converting 3.3-V PCIe auxiliary power to low-noise 1.2-V core voltage for RF transceivers and MAC controllers. Use Value: 68 dB PSRR at 100 Hz suppresses switching noise from upstream DC/DC converters, reducing RF EMI and improving link margin. |
| Portable Industrial Sensor Node | Wearable Health Monitor Core Supply |
|
Use Scenario: Provides regulated 1.2-V supply for ultra-low-power microcontrollers and analog front-ends in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Always-on system LDO enabling deep-sleep MCU operation with minimal wake-up latency and leakage. Use Value: Foldback current limit and thermal shutdown protect against accidental shorts during field deployment, ensuring long-term reliability. |
Use Scenario: Powers ASIC or SoC in compact fitness trackers and ECG patches where thickness and battery life are critical constraints. IC Role / Device Role / Timing Role: Main system LDO supporting dynamic voltage scaling and rapid enable/disable cycles synchronized with sensor sampling intervals. Use Value: Active output discharge prevents backflow into disabled subsystems, eliminating risk of unintended power-on or data corruption during sleep transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLS850F0TESK | 500-mA automotive-grade LDO with integrated watchdog and reset; 300 mV dropout at 500 mA; AEC-Q100 qualified. | Designed for automotive body electronics (e.g., door modules); includes safety features not required in consumer portables. | Select TLS850F0TESK only if functional safety compliance (ASIL-B) and higher current are needed - adds cost and complexity for non-automotive use. |
| MCP1703T-1202E/MB | 250-mA, 1.2-V fixed LDO in SOT-23-5; 600 mV dropout at 250 mA; 3 µA IQ; no enable or active discharge. | Targeted at ultra-low-power industrial sensors; lacks EN control and fast discharge - unsuitable for systems requiring controlled power sequencing. | Choose MCP1703T-1202E/MB only when lowest possible IQ dominates design priorities and enable/discharge functionality is omitted. |
Compared with TLS850F0TESK and MCP1703T-1202E/MB, TLV74312PDQNR uniquely balances ultra-small size, 300-mA capability, active discharge, and 34-µA IQ - making it optimal for portable consumer electronics where board area, battery life, and power sequencing integrity are jointly critical.
Availability
TLV74312PDQNR is available at Aetrix Electronics and suitable for camera modules, WLAN add-on cards, portable industrial sensor nodes, and wearable health monitors requiring stable component supply across high-mix, low-volume production runs.
Supply support for TLV74312PDQNR 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 connectivity technologies, with decades of LDO design expertise and broad manufacturing scale.
The TLV743P family was engineered for ultra-low-power, space-constrained portable electronics - delivering high accuracy, small-footprint regulation, and robust protection in battery-powered devices like smartphones and wearables.
FAQ
What is the maximum input voltage rating for TLV74312PDQNR?
The absolute maximum input voltage for TLV74312PDQNR is 6 V. Operation beyond this risks permanent damage. For reliable continuous use, TI specifies 1.4 V to 5.5 V input range per Recommended Operating Conditions. Exceeding 5.5 V may trigger internal protection but is not guaranteed to prevent failure.
Does TLV74312PDQNR require an external pull-up resistor on the EN pin?
No - TLV74312PDQNR has no internal pull-up or pull-down on the EN pin. If enable control is not needed, connect EN directly to IN. If GPIO control is used, ensure the driving source meets VEN(HI) ≥ 0.9 V and VEN(LO) ≤ 0.35 V thresholds across temperature and supply variation.
Can TLV74312PDQNR operate with a 0.47-µF output capacitor?
No - TLV74312PDQNR is specified and tested for stability with ≥1-µF ceramic output capacitance. Using 0.47 µF violates the minimum requirement and may cause oscillation or poor transient response. TI does not guarantee stability below 1 µF.
What is the thermal resistance (RθJA) of TLV74312PDQNR in its X2SON package?
The junction-to-ambient thermal resistance (RθJA) for TLV74312PDQNR in the DQN (X2SON) package is 218.6°C/W, measured on a standard JEDEC 2-layer board. Actual thermal performance depends heavily on PCB copper area connected to the thermal pad - adding thermal vias improves RθJA significantly.
How does the foldback current limit behave during startup of TLV74312PDQNR?
During startup, TLV74312PDQNR applies foldback current limiting - reducing allowable output current as VOUT drops. At 1.2 V output, short-circuit current is typically 150 mA. This prevents inrush damage but may delay full regulation if loaded by constant-current sinks before VOUT stabilizes.
TLV74312PDQNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 4-XDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.45V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 60 µA
- Current - Supply (Max):
- -
- PSRR:
- 68dB ~ 28dB (100Hz ~ 100kHz)
- Control Features:
- Enable
- Protection Features:
- Current Limit, Thermal Shutdown, UVLO
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-X2SON (1x1)
TLV74312PDQNR FAQ
1.How can I place an order for TLV74312PDQNR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV74312PDQNR 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 TLV74312PDQNR reliable?
The price and inventory of TLV74312PDQNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV74312PDQNR is usually 5 days.
3.What payment methods are accepted for TLV74312PDQNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV74312PDQNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV74312PDQNR?
TLV74312PDQNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV74312PDQNR 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 TLV74312PDQNR?
For technical support, including TLV74312PDQNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV74312PDQNR requirements.
6.How does Aetrix verify that TLV74312PDQNR is sourced from the original manufacturer or authorized distributors?
All TLV74312PDQNR 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 TLV74312PDQNR meets industry standards.
7.What is the process for return or replacement of TLV74312PDQNR?
All TLV74312PDQNR units undergo pre-shipment inspection (PSI). If there is an issue with TLV74312PDQNR, 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 TLV74312PDQNR part is unused and in its original packaging.
Return procedure for TLV74312PDQNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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