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Texas Instruments LP38692SDX-3.3
- Part No.:
- LP38692SDX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38692SDX-3.3.pdf
- Description:
- IC REG LINEAR 3.3V 1A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,878
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Product details
Overview
LP38692SDX-3.3 from Texas Instruments is a 3.3 V, 1-A low-dropout CMOS linear regulator in a 5-pin SOT-223 package, featuring enable control (EN), ±2.5% output accuracy at 25°C, 650 mV dropout at 1 A (VOUT = 3.3 V), and stable operation with 1-µF ceramic output capacitors. It serves as a precision power supply for microcontroller cores and I/O rails in space-constrained portable systems.
For engineers reviewing the LP38692SDX-3.3 datasheet, LP38692SDX-3.3 pinout, LP38692SDX-3.3 application, or LP38692SDX-3.3 equivalent, key selection criteria include dropout voltage at full load, EN logic thresholds across temperature, ground pin current stability under varying load, thermal derating in SOT-223 layout, and compatibility with ultra-low-ESR ceramic capacitors without external compensation.
Technical Context
The LP38692SDX-3.3 uses a PMOS pass transistor architecture, eliminating DC base drive current and enabling ground pin current ≤100 µA across load, input voltage, and temperature. Its trimmed bandgap reference and feedback loop ensure 2.5% output accuracy over –40°C to 125°C junction range.
It integrates foldback current limiting (450 mA at VIN–VOUT > 5 V; 1500 mA at VIN–VOUT < 4 V), thermal shutdown activation at 160°C with 10°C hysteresis, and supports remote sensing via SNS pin in WSON variants - though SNS is not connected in the SOT-223 package used by LP38692SDX-3.3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±2.5% at 25°C; ±5% over –40°C to 125°C ensures reliable MCU I/O rail regulation. |
| Max Output Current | 1 A continuous; limited by thermal resistance (RθJA = 68.5°C/W) and ambient temperature in SOT-223 layout. |
| Dropout Voltage | 650 mV at 1 A (VOUT = 3.3 V); enables operation from 3.95 V input, critical for single-cell Li-ion or 5 V rail post-regulation. |
| Quiescent Current | 55 µA typical at full load; remains ≤100 µA over temperature, minimizing standby power in battery systems. |
| Enable Threshold | VEN(ON) ≥1.8 V at VIN = 4 V; VEN(OFF) ≤0.4 V - compatible with standard GPIO logic levels without level-shifting. |
| PSRR | 55 dB at 120 Hz (1 Vp-p ripple); suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Output Noise | 0.7 µV/√Hz (10 Hz–10 kHz); low enough for analog sensor interfaces and ADC reference supplies. |
Pinout & Package
LP38692SDX-3.3 is housed in a thermally enhanced 5-pin SOT-223 (NDC) package (6.50 mm × 3.56 mm), with the exposed tab electrically connected to GND and serving as the primary thermal path to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply connection | Accepts 2.7–10 V; must be decoupled with ≥1 µF ceramic capacitor close to pin to maintain stability. |
| 2 (GND) | Power and signal ground | Thermally coupled to die; requires large copper pour for heat dissipation; ground return for all internal circuitry. |
| 3 (OUT) | Regulated output | Delivers 3.3 V at up to 1 A; connects directly to load; requires ≥1 µF ceramic capacitor with ESR 5–500 mΩ. |
| 4 (SNS) | Sense input (not bonded in SOT-223) | No internal connection in LP38692SDX-3.3; left unconnected per datasheet - remote sensing unavailable in this variant. |
| 5 (EN) | Enable control input | Active-high logic: drives OUT when ≥1.8 V (VIN = 4 V); disables regulator and reduces IQ to 1 µA when ≤0.4 V. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output cap | Eliminates need for tantalum or aluminum electrolytic capacitors - reduces board area, cost, and aging-related drift. |
| Ultra-low ground pin current | 55 µA typical at full load; enables accurate current-sense measurements and extends battery life in always-on systems. |
| Enable pin with 1-µA leakage | Allows clean ON/OFF sequencing; IEN ≤1 µA prevents unintended biasing when driven by high-impedance sources. |
| Thermal shutdown with hysteresis | Shuts down at 160°C junction; restarts at ~150°C - prevents thermal runaway while allowing safe recovery after transient overload. |
| Foldback current limiting | Reduces short-circuit current as VOUT collapses - protects both regulator and downstream circuitry during fault conditions. |
Applications
| Hard Disk Drive Power | Notebook System Rail |
|---|---|
|
Use Scenario: Supplies 3.3 V to HDD servo controller and interface logic during spin-up and data transfer. IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, low-noise 3.3 V from 5 V or 12 V intermediate bus. Use Value: 650 mV dropout allows operation during brown-out events; 0.7 µV/√Hz noise prevents bit errors in high-speed SATA links. |
Use Scenario: Powers DDR3/DDR4 memory termination (VTT) and chipset I/O rails in ultraportable notebooks. IC Role / Device Role / Timing Role: Low-quiescent-current LDO providing stable 3.3 V during sleep/resume transitions. Use Value: 55 µA ground current enables precise system-level power budgeting; enable pin synchronizes with platform power states. |
| Battery-Powered Instrumentation | Portable Medical Sensor Hub |
|
Use Scenario: Regulates 3.3 V for microcontroller, display driver, and precision ADC in handheld test equipment. IC Role / Device Role / Timing Role: Main system supply LDO ensuring voltage integrity across wide battery discharge range (3.0–4.2 V). Use Value: 2.5% accuracy maintains ADC reference stability; 1-µF ceramic compatibility simplifies layout in compact enclosures. |
Use Scenario: Powers ECG front-end analog circuitry and Bluetooth LE radio in wearable patient monitors. IC Role / Device Role / Timing Role: Low-noise, low-IQ supply for mixed-signal signal chain requiring minimal EMI coupling. Use Value: 55 dB PSRR rejects switching noise from RF section; thermal shutdown protects against skin-contact overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGEDR | 3.3 V, 500 mA, 250 mV dropout at 500 mA; no enable pin; 1.5% initial accuracy. | Lacks enable control and full 1-A capability; better suited for lower-current, always-on functions. | Select when lower dropout and tighter initial tolerance are prioritized over programmable enable and higher current. |
| MCP1826T-3302E/DB | 3.3 V, 1 A, 600 mV dropout at 1 A; enable pin; ±2% accuracy; requires 2.2 µF minimum output capacitance. | Higher minimum COUT requirement increases BOM cost and footprint vs. LP38692SDX-3.3's 1-µF support. | Choose when tighter accuracy and slightly lower dropout are needed, accepting larger output capacitor size. |
Compared with TPL7407LPGEDR and MCP1826T-3302E/DB, LP38692SDX-3.3 uniquely balances 1-A capability, 1-µF ceramic stability, enable functionality, and industry-standard SOT-223 thermal performance - making it optimal for cost-sensitive, space-constrained portable designs requiring robust sequencing and thermal margin.
Availability
LP38692SDX-3.3 is available at Aetrix Electronics and suitable for hard disk drives, notebook computers, battery-powered devices, portable instrumentation, and medical sensor hubs requiring stable component supply across extended product lifecycles.
Supply support for LP38692SDX-3.3 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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and portable applications.
The LP38692SDX-3.3 belongs to TI's LP3869x family of low-dropout linear regulators, designed specifically for battery-powered digital systems demanding fast start-up, ultra-low quiescent current, and ceramic-capacitor stability without external compensation.
FAQ
What is the maximum input voltage rating for LP38692SDX-3.3?
The absolute maximum input voltage for LP38692SDX-3.3 is 12 V across all pins relative to GND. However, the recommended operating range is 2.7 V to 10 V. Exceeding 10 V may accelerate parametric drift or reduce long-term reliability, even if within absolute maximum limits. The LP38692SDX-3.3 must be operated within its specified thermal limits when used near the upper end of this range.
Does LP38692SDX-3.3 support remote voltage sensing?
No, LP38692SDX-3.3 does not support remote sensing. Although the LP38692 family includes an SNS pin in WSON packages, the SOT-223 variant (LP38692SDX-3.3) has no internal bond to the SNS pin - it is unconnected and must be left floating. Remote sensing is only available on WSON-packaged LP38692 devices, not on LP38692SDX-3.3.
What is the typical ground pin current of LP38692SDX-3.3 at full 1-A load?
The typical ground pin current of LP38692SDX-3.3 is 55 µA at full 1-A load, 25°C, and nominal input voltage. This value remains ≤100 µA across the full operating temperature range (–40°C to 125°C) and load conditions (100 µA to 1 A), enabling highly accurate system-level current monitoring and low-power design.
Can LP38692SDX-3.3 operate with a 1-µF ceramic output capacitor?
Yes, LP38692SDX-3.3 is explicitly designed and characterized to be stable with a single 1-µF ceramic output capacitor (ESR 5–500 mΩ). This eliminates the need for larger, higher-ESR tantalum or aluminum electrolytic capacitors - reducing board area, cost, and long-term reliability risks associated with capacitor aging.
What happens to LP38692SDX-3.3 when the enable pin is left floating?
The enable pin of LP38692SDX-3.3 has no internal pull-up or pull-down resistor. If left floating, the device behavior is undefined and may result in erratic turn-on/turn-off or increased susceptibility to noise-induced switching. TI specifies that EN must be actively terminated - either tied to IN for always-on operation or driven by a controlled logic source.
LP38692SDX-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 55 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- 55dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LP38692SDX-3.3 FAQ
1.How can I place an order for LP38692SDX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38692SDX-3.3 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 LP38692SDX-3.3 reliable?
The price and inventory of LP38692SDX-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38692SDX-3.3 is usually 5 days.
3.What payment methods are accepted for LP38692SDX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38692SDX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38692SDX-3.3?
LP38692SDX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38692SDX-3.3 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 LP38692SDX-3.3?
For technical support, including LP38692SDX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38692SDX-3.3 requirements.
6.How does Aetrix verify that LP38692SDX-3.3 is sourced from the original manufacturer or authorized distributors?
All LP38692SDX-3.3 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 LP38692SDX-3.3 meets industry standards.
7.What is the process for return or replacement of LP38692SDX-3.3?
All LP38692SDX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LP38692SDX-3.3, 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 LP38692SDX-3.3 part is unused and in its original packaging.
Return procedure for LP38692SDX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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