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Texas Instruments LP38692SDX-ADJ
- Part No.:
- LP38692SDX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38692SDX-ADJ.pdf
- Description:
- IC REG LINEAR POS ADJ 1A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,907
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Product details
Overview
LP38692SDX-ADJ from Texas Instruments is a 1-A adjustable-output low-dropout CMOS linear regulator with PMOS pass element, stable with 1-µF ceramic output capacitors, 450-mV dropout at 1 A (5-V output), and ±2.5% ADJ pin voltage accuracy at 25°C - used in notebook computers and portable instrumentation for clean local power rail generation.
For engineers reviewing the LP38692SDX-ADJ datasheet, LP38692SDX-ADJ pinout, LP38692SDX-ADJ application, or LP38692SDX-ADJ equivalent, this page delivers verified electrical specs, thermal performance data, EN pin behavior, foldback current limiting thresholds, and SOT-223 package layout guidance - all specific to the LP38692SDX-ADJ variant.
Technical Context
The LP38692SDX-ADJ integrates a precision 1.25-V trimmed bandgap reference, PMOS pass transistor with no gate drive current requirement, and enable-controlled startup logic. Its foldback current limit responds dynamically to VIN–VOUT differential: ~450 mA limit when ΔV > 5 V, ~1500 mA when ΔV < 4 V.
Thermal shutdown activates at 160°C with 10°C hysteresis; ground pin current remains ≤55 µA at full load due to PMOS architecture. The device operates across –40°C to +125°C and supports ceramic capacitors with ESR from 0 mΩ to 100 mΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A maximum continuous - supports high-current digital loads without external heat sinking in SOT-223 package. |
| Dropout Voltage | 450 mV typical at 1 A, 5-V output - enables regulation from 5.45-V input down to 5-V rail under full load. |
| ADJ Pin Voltage | 1.25 V ±2.5% at 25°C - sets output via R1/R2 divider with minimal error contribution to VOUT = 1.25 × (1 + R1/R2). |
| Quiescent Current | 55 µA typical at full load - maintains ultra-low ground current independent of load, input, or temperature. |
| Enable Threshold | VEN(OFF) ≤ 0.4 V, VEN(ON) ≥ 1.8 V (VIN = 4 V) - supports direct connection to 3.3-V or 5-V logic without level shifting. |
| PSRR | 55 dB at 120 Hz - suppresses ripple from upstream switching regulators feeding the IN pin. |
| Thermal Shutdown | 160°C activation with 10°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
The LP38692SDX-ADJ is packaged in a 5-pin SOT-223 (NDC) with exposed thermal pad on bottom. Pin 1 = IN, Pin 2 = ADJ, Pin 3 = EN, Pin 4 = OUT, Pin 5 = GND. The exposed pad must be soldered to a copper plane for thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input supply connection | Accepts 2.7–10 V; both IN pins not applicable (WSON variant only); requires ≥1-µF ceramic capacitor within 1 cm. |
| ADJ (Pin 2) | Feedback reference node | 1.25-V reference point; connects to R1–R2 divider; leakage ≤100 nA ensures minimal divider error. |
| EN (Pin 3) | Enable control input | Active-high logic input; no internal pull-up/down; must be terminated externally; enables zero-quiescent-current shutdown mode. |
| OUT (Pin 4) | Regulated output | Delivers adjustable 1.25–9 V; stable with 1-µF ceramic capacitor; ESR range 0–100 mΩ supported. |
| GND (Pin 5) | Power and signal ground | Thermally connected to die; serves as primary heat path when soldered to large copper area; ground current ≤55 µA at 1 A load. |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Transistor | Eliminates base/gate drive current - keeps ground pin current below 100 µA across full operating range. |
| Ceramic-Capacitor Stability | Stable with 1-µF ceramic output capacitor and ESR from 0 to 100 mΩ - reduces BOM cost and board space vs. tantalum. |
| Foldback Current Limit | Dynamically scales current limit based on VIN–VOUT differential: ~450 mA at ΔV > 5 V, ~1500 mA at ΔV < 4 V - prevents thermal runaway during short-circuit events. |
| Wide Temperature Range | Specified from –40°C to +125°C - suitable for industrial and automotive under-hood applications requiring extended junction operation. |
| Low-Noise Operation | 0.7 µV/√Hz output noise (10 Hz–10 kHz, 3.3-V output) - preserves signal integrity in ADC reference or RF bias rails. |
Applications
| Hard Disk Drives | Notebook Computers |
|---|---|
Use Scenario: Powering servo motor drivers and read/write channel ICs requiring low-noise, tightly regulated 3.3-V or 5-V rails. IC Role / Device Role / Timing Role: Local LDO providing clean, low-ripple supply independent of main system DC/DC converter. Use Value: 55-dB PSRR at 120 Hz suppresses switching ripple from buck converters; 450-mV dropout enables efficient use of battery headroom. |
Use Scenario: Generating core voltage for embedded controllers or USB PHYs in compact, thermally constrained chassis. IC Role / Device Role / Timing Role: Adjustable-output LDO delivering 1.8-V or 2.5-V rails with fast transient response to CPU load changes. Use Value: 1-A capability and 55-µA quiescent current extend battery life while supporting burst-mode processing loads. |
| Battery-Powered Devices | Portable Instrumentation |
Use Scenario: Regulating power for handheld test equipment with Li-ion battery input (3.0–4.2 V) and variable load profiles. IC Role / Device Role / Timing Role: Primary voltage regulator enabling stable 3.3-V operation across full battery discharge curve. Use Value: 450-mV dropout allows usable runtime down to 3.75-V battery voltage; EN pin enables deep-sleep mode with <1-µA off-state current. |
Use Scenario: Supplying precision analog front-ends (e.g., op-amps, ADC references) in field-deployable sensors. IC Role / Device Role / Timing Role: Low-noise, low-drift LDO ensuring stable reference voltage despite ambient temperature swings. Use Value: ±2.5% ADJ pin accuracy and 0.7 µV/√Hz noise preserve measurement fidelity; –40°C to +125°C rating ensures outdoor reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LDR | 7-channel 500-mA sink driver with integrated LDO; fixed 3.3-V output; no ADJ pin or external resistor setting. | Designed for LED/relay driving, not general-purpose adjustable regulation; lacks EN pin and thermal shutdown. | Select only if fixed 3.3-V output and multi-channel sink functionality are required - not a functional substitute for LP38692SDX-ADJ. |
| TPS7A2025PDBVR | 250-mA LDO with 1.6-V to 6.0-V input, 2.5-V fixed output, 160-mV dropout, and 6.5-µA IQ - no ADJ pin or EN function. | Optimized for ultra-low-IQ always-on rails; insufficient current for 1-A loads; no output adjustability or enable control. | Choose only for low-power, fixed-voltage bias rails where 250-mA output and sub-10-µA quiescent current are critical. |
Compared with TPL7407LDR and TPS7A2025PDBVR, the LP38692SDX-ADJ uniquely combines 1-A adjustable output, EN control, foldback current limiting, and ceramic-capacitor stability - making it irreplaceable for high-current, thermally demanding, and programmable-voltage applications.
Availability
LP38692SDX-ADJ is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, battery-powered devices, and hard disk drives requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP38692SDX-ADJ 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 designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and consumer applications.
The LP38692SDX-ADJ belongs to TI's LP3869x family of low-dropout linear regulators engineered for portable, battery-powered digital systems requiring accurate, low-noise, and thermally robust local voltage regulation.
FAQ
What is the minimum load current required for stable operation of the LP38692SDX-ADJ?
The LP38692SDX-ADJ requires a minimum load current of 100 µA to maintain regulation stability. This is satisfied by the ADJ pin's internal reference current path and external R1/R2 divider network. TI recommends keeping R2 ≤12 kΩ to ensure adequate loading even under light-load conditions, preventing output voltage drift or oscillation in the LP38692SDX-ADJ.
Does the LP38692SDX-ADJ support ceramic output capacitors, and what ESR range is acceptable?
Yes, the LP38692SDX-ADJ is explicitly designed for stability with ceramic output capacitors. It supports ESR values from 0 mΩ up to 100 mΩ and requires a minimum capacitance of 1 µF. Unlike older LDOs, it does not require added ESR for phase margin - enabling smaller, lower-cost, and higher-reliability ceramic solutions in the LP38692SDX-ADJ design.
How does the EN pin function on the LP38692SDX-ADJ, and what are its voltage thresholds?
The EN pin on the LP38692SDX-ADJ is an active-high enable input with no internal pull-up or pull-down. It turns the regulator ON when voltage exceeds 1.8 V (at VIN = 4 V) and OFF when ≤0.4 V. The threshold has no hysteresis, so clean logic transitions are required. If unused, EN must be tied directly to IN - a key differentiator from the LP38690-ADJ, which lacks this pin entirely in the LP38692SDX-ADJ.
What is the thermal performance of the LP38692SDX-ADJ in its SOT-223 package?
The LP38692SDX-ADJ in the 5-pin SOT-223 (NDC) package has a junction-to-ambient thermal resistance (RθJA) of 68.5°C/W on a standard JEDEC High-K board. With proper PCB copper pour and thermal vias under the exposed pad, it delivers full 1-A output continuously up to +125°C ambient - validated by TI's thermal characterization data for the LP38692SDX-ADJ.
Can the LP38692SDX-ADJ be used in reverse-voltage protection scenarios?
The LP38692SDX-ADJ contains an inherent parasitic body diode in its PMOS pass transistor that conducts when VOUT exceeds VIN by >500 mV. While this provides limited reverse-path conduction, continuous reverse current must be externally limited to <1 A. For robust reverse-voltage protection, a series Schottky diode or dedicated protection IC is recommended - the LP38692SDX-ADJ itself does not provide active reverse blocking.
LP38692SDX-ADJ 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:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 9V
- Voltage Dropout (Max):
- -
- 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-ADJ FAQ
1.How can I place an order for LP38692SDX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38692SDX-ADJ 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-ADJ reliable?
The price and inventory of LP38692SDX-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38692SDX-ADJ is usually 5 days.
3.What payment methods are accepted for LP38692SDX-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38692SDX-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38692SDX-ADJ?
LP38692SDX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38692SDX-ADJ 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-ADJ?
For technical support, including LP38692SDX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38692SDX-ADJ requirements.
6.How does Aetrix verify that LP38692SDX-ADJ is sourced from the original manufacturer or authorized distributors?
All LP38692SDX-ADJ 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-ADJ meets industry standards.
7.What is the process for return or replacement of LP38692SDX-ADJ?
All LP38692SDX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LP38692SDX-ADJ, 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-ADJ part is unused and in its original packaging.
Return procedure for LP38692SDX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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