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Texas Instruments LP38692MPX-ADJ/NOPB
- Part No.:
- LP38692MPX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-5, TO-261AB
- Datasheet:
-
LP38692MPX-ADJ/NOPB.pdf
- Description:
- IC REG LINEAR POS ADJ 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:4,288
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Product details
Overview
LP38692MPX-ADJ/NOPB from Texas Instruments is a 1-A adjustable-output low-dropout CMOS linear regulator with enable functionality, stable with ceramic output capacitors. It delivers 1.25 V to 9 V output across 2.7 V–10 V input, achieves 450 mV dropout at 1 A (5 V out), and maintains ±2.5% ADJ pin voltage accuracy at 25°C for precision biasing in portable power rails.
For engineers reviewing the LP38692MPX-ADJ/NOPB datasheet, LP38692MPX-ADJ/NOPB pinout, LP38692MPX-ADJ/NOPB application, or LP38692MPX-ADJ/NOPB equivalent, key selection criteria include EN-controlled sequencing, thermal performance in SOT-223 (68.5°C/W RθJA), ground current <100 µA under full load, and compatibility with 1-µF ceramic output capacitors without external compensation.
Technical Context
The LP38692MPX-ADJ/NOPB uses a PMOS pass transistor to eliminate base drive current, enabling ground pin current as low as 55 µA at full load. Its internal 1.25-V trimmed bandgap reference feeds an error amplifier that controls the pass element via a MOSFET driver, supporting fast line/load transient response and foldback current limiting dependent on VIN–VOUT differential.
It integrates thermal shutdown (160°C activation, 10°C hysteresis) and operates across –40°C to +125°C junction temperature. The EN pin provides logic-level control (ON threshold 1.8 V at VIN = 4 V; OFF threshold 0.4 V), with no internal pull-up/pull-down-requiring external termination for defined startup behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A maximum continuous; supports full-rated load in high-ambient environments due to low thermal resistance (68.5°C/W RθJA in SOT-223). |
| Dropout Voltage | 450 mV typical at 1 A, 5 V output; enables regulation from 2.7 V input down to 1.25 V output with minimal headroom loss. |
| ADJ Pin Voltage | 1.25 V ±2.5% at 25°C; sets output via external resistor divider (VOUT = 1.25 × (1 + R1/R2)) with guaranteed accuracy over full temperature range. |
| Quiescent Current | 55 µA typical at full load; remains below 100 µA across 100 µA–1 A load, enabling ultra-low-power standby operation. |
| Enable Threshold | EN pin turns device ON above 1.8 V (VIN = 4 V); OFF below 0.4 V; requires external pull-up/down for deterministic state at power-up. |
| PSRR | 55 dB at 120 Hz with 1 Vp-p ripple; suppresses switching noise from upstream DC/DC converters in mixed-signal systems. |
| Noise Density | 0.7 µV/√Hz (10 Hz–10 kHz, 3.3 V out); suitable for noise-sensitive analog circuitry including ADC references and RF bias rails. |
Pinout & Package
LP38692MPX-ADJ/NOPB is packaged in a 5-pin SOT-223 (6.50 mm × 3.56 mm) with exposed thermal pad (DAP) soldered to PCB copper for enhanced heat dissipation. Pin 1 is IN, Pin 2 is GND (thermally connected to die), Pin 3 is EN, Pin 4 is ADJ, and Pin 5 is OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input supply connection | Accepts 2.7 V–10 V; must be decoupled with ≥1-µF ceramic capacitor within 1 cm of pin for stability. |
| GND (Pin 2) | Circuit and thermal reference | Serves as regulator ground and primary heat sink; requires large copper pour for thermal management. |
| EN (Pin 3) | Logic-level enable control | Drives regulator ON/OFF; no internal bias-must be actively terminated to avoid undefined startup behavior. |
| ADJ (Pin 4) | Feedback reference node | Connects to resistor divider (R1/R2); 1.25 V reference enables precise output programming with ≤12 kΩ R2 for noise immunity. |
| OUT (Pin 5) | Regulated output | Delivers up to 1 A; requires ≥1-µF ceramic capacitor directly between OUT and GND for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Transistor | Eliminates base drive current, keeping ground pin current below 100 µA regardless of load, input, or temperature-critical for battery runtime. |
| Ceramic-Capacitor Stability | Stable with 1-µF ceramic output capacitors (0–100 mΩ ESR), reducing BOM count and board space vs. tantalum alternatives. |
| Foldback Current Limit | Adjusts current limit based on VIN–VOUT differential: ~450 mA when >5 V drop, ~1500 mA when <4 V drop-protects during start-up or overload. |
| Thermal Shutdown | Activates at 160°C junction temperature with 10°C hysteresis, preventing permanent damage during sustained overload or poor heatsinking. |
| Wide Temp Range Spec | Full electrical specifications guaranteed from –40°C to +125°C, enabling use in automotive engine compartments and industrial controllers. |
Applications
| Hard Disk Drive Power Rails | Notebook System Biasing |
|---|---|
Use Scenario: Supplies regulated 3.3 V or 5 V to HDD spindle motor drivers and servo controllers requiring low-noise, fast-transient response. IC Role / Device Role / Timing Role: Primary LDO delivering clean, sequenced power to analog and digital subsystems; EN pin enables synchronized startup with host controller. Use Value: 0.7 µV/√Hz noise density prevents data corruption; 450 mV dropout allows efficient use of partially discharged batteries during spin-up. | Use Scenario: Powers DDR memory termination (VTT) or chipset I/O rails in ultraportable notebooks where thermal headroom is constrained. IC Role / Device Role / Timing Role: Adjustable LDO providing programmable bias voltages; SOT-223 package enables compact layout with direct DAP-to-plane thermal path. Use Value: 68.5°C/W RθJA permits 1 A operation at 85°C ambient; 55 µA quiescent current extends battery life in sleep states. |
| Battery-Powered Medical Sensors | Portable Test Instrumentation |
Use Scenario: Generates stable 1.8 V or 2.5 V reference for low-power ADCs and op-amps in handheld ECG or glucose monitors. IC Role / Device Role / Timing Role: Precision analog rail generator; ADJ pin accuracy (±2.5%) ensures consistent sensor signal conditioning across temperature. Use Value: 1.25 V reference tolerance minimizes calibration drift; ceramic-capacitor compatibility avoids aging-related failures in long-life devices. | Use Scenario: Supplies variable bias to FPGA I/O banks or RF front-end ICs in field-deployable spectrum analyzers or signal generators. IC Role / Device Role / Timing Role: Programmable LDO supporting multiple voltage domains; EN pin enables dynamic power cycling of unused instrument sections. Use Value: Foldback current limiting protects against short-circuited probe interfaces; PSRR >55 dB rejects switching noise from onboard DC/DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLS850F0TESA1 | Automotive-grade AEC-Q100 qualified; fixed 5 V output only; higher quiescent current (30 µA typ) but integrated watchdog and reset functions. | Designed for automotive body electronics; lacks ADJ pin and EN flexibility-requires redesign for non-5 V outputs or custom sequencing. | Select only if automotive qualification and system monitoring features outweigh need for adjustability and low IQ. |
| TPS7A4701RGWR | Ultra-low-noise (4.7 µVRMS), higher PSRR (70 dB at 120 Hz), but lower max current (1 A vs. 1 A) and higher dropout (600 mV at 1 A). | Targeted at high-precision audio and RF bias; requires larger output capacitance (≥2.2 µF) and has tighter input voltage range (2.9 V–20 V). | Prefer for noise-critical analog rails; avoid when minimizing input headroom or using 1-µF ceramics is mandatory. |
Compared with TLS850F0TESA1 and TPS7A4701RGWR, LP38692MPX-ADJ/NOPB offers the optimal balance of adjustability, ceramic-capacitor compatibility, and thermal efficiency in SOT-223-making it ideal for cost-sensitive, space-constrained portable designs where EN-controlled sequencing and sub-100 µA quiescent current are essential.
Availability
LP38692MPX-ADJ/NOPB is available at Aetrix Electronics and suitable for hard disk drives, notebook computers, and battery-powered medical sensors requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP38692MPX-ADJ/NOPB 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
LP38692MPX-ADJ/NOPB belongs to TI's LP3869x family of low-dropout linear regulators, designed specifically for portable, battery-powered digital systems requiring accurate, fast-starting output voltage with minimal external components.
FAQ
What is the minimum load current required for stable operation of LP38692MPX-ADJ/NOPB?
The LP38692MPX-ADJ/NOPB requires a minimum load current of 100 µA to maintain regulation and ensure proper feedback loop behavior. This is achieved by selecting R2 ≤12 kΩ in the ADJ resistor divider network. Operating below this threshold may cause output voltage drift or instability, especially at light loads and elevated temperatures. The LP38692MPX-ADJ/NOPB datasheet specifies this value under Recommended Operating Conditions and Electrical Characteristics tables.
Can LP38692MPX-ADJ/NOPB operate with a 1-µF ceramic output capacitor?
Yes, LP38692MPX-ADJ/NOPB is explicitly designed for stability with 1-µF ceramic output capacitors having ESR between 0 mΩ and 100 mΩ. Unlike many older LDOs, it does not require tantalum or electrolytic capacitors. The internal compensation is optimized for ultralow-ESR ceramics, eliminating the need for external compensation networks. This capability is confirmed in the device description, Features list, and Application and Implementation sections of the LP38692MPX-ADJ/NOPB datasheet.
What is the thermal resistance (RθJA) of LP38692MPX-ADJ/NOPB in its SOT-223 package?
The junction-to-ambient thermal resistance (RθJA) of LP38692MPX-ADJ/NOPB in the 5-pin SOT-223 package is 68.5°C/W under JEDEC High-K board conditions. This value assumes standard PCB layout with adequate copper pour connected to the exposed thermal pad (DAP). Actual thermal performance improves with larger copper areas and thermal vias. The LP38692MPX-ADJ/NOPB Thermal Information table (Section 6.4) confirms this metric and notes that RθJB is 13.0°C/W, indicating strong board conduction capability.
How does the EN pin function on LP38692MPX-ADJ/NOPB, and what are its voltage thresholds?
The EN pin on LP38692MPX-ADJ/NOPB is a logic-level enable input with no internal pull-up or pull-down. It turns the regulator ON when pulled above 1.8 V (at VIN = 4 V) and OFF when pulled below 0.4 V. Thresholds vary slightly with VIN: at VIN = 10 V, ON threshold is 4 V. Because there is no hysteresis, clean, monotonic transitions are required. If unused, EN must be tied directly to IN. This behavior is documented in the Pin Functions table and Device Functional Modes section of the LP38692MPX-ADJ/NOPB datasheet.
Does LP38692MPX-ADJ/NOPB include overcurrent protection, and how does it behave?
Yes, LP38692MPX-ADJ/NOPB includes foldback current limiting that dynamically adjusts based on the VIN–VOUT differential. When VIN–VOUT exceeds 5 V, current limits at ~450 mA; when below 4 V, limit rises to ~1500 mA. This protects against shorts while allowing full current during normal operation. The foldback behavior is detailed in Feature Description Section 7.3.1 and Electrical Characteristics Table 6.5 (IFB parameter) of the LP38692MPX-ADJ/NOPB datasheet.
LP38692MPX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-261-5, TO-261AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- SOT-223-5
LP38692MPX-ADJ/NOPB FAQ
1.How can I place an order for LP38692MPX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38692MPX-ADJ/NOPB 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 LP38692MPX-ADJ/NOPB reliable?
The price and inventory of LP38692MPX-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38692MPX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LP38692MPX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38692MPX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38692MPX-ADJ/NOPB?
LP38692MPX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38692MPX-ADJ/NOPB 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 LP38692MPX-ADJ/NOPB?
For technical support, including LP38692MPX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38692MPX-ADJ/NOPB requirements.
6.How does Aetrix verify that LP38692MPX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38692MPX-ADJ/NOPB 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 LP38692MPX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LP38692MPX-ADJ/NOPB?
All LP38692MPX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38692MPX-ADJ/NOPB, 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 LP38692MPX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LP38692MPX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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