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Texas Instruments LP38693SDX-ADJ/NOPB
- Part No.:
- LP38693SDX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38693SDX-ADJ/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 500MA 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,729
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Product details
Overview
LP38693SDX-ADJ/NOPB from Texas Instruments is a 500-mA adjustable-output CMOS low-dropout linear regulator with PMOS pass element, 250 mV dropout at 5 V/500 mA, ±2% ADJ pin reference accuracy (25°C), and stable operation with 1-µF ceramic output capacitors. It delivers precision voltage regulation in battery-powered portable instrumentation and notebook computers.
For engineers reviewing the LP38693SDX-ADJ/NOPB datasheet, LP38693SDX-ADJ/NOPB pinout, LP38693SDX-ADJ/NOPB application, or LP38693SDX-ADJ/NOPB equivalent, this page provides verified package mapping (SOT-223-5), confirmed enable functionality, thermal shutdown behavior, foldback current limiting thresholds, and real-world stability conditions with ultra-low-ESR ceramics.
Technical Context
The LP38693SDX-ADJ/NOPB uses a PMOS pass transistor enabling ground-pin current under 100 µA across load, input voltage, and temperature - eliminating base-drive losses. Its trimmed 1.25-V bandgap reference ensures ±2% ADJ pin voltage accuracy at 25°C and ±5% over –40°C to +125°C.
It integrates enable logic with no internal pull-up/down, requiring external termination; thermal shutdown activates at ~160°C with ~10°C hysteresis; foldback current limiting responds dynamically to VIN–VOUT differential - limiting to ~350 mA above 5 V ΔV and ~850 mA below 4 V ΔV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 500 mA maximum continuous - supports full-load operation in compact SOT-223 package without external heatsink up to +125°C ambient. |
| Dropout Voltage | 250 mV typical at 5 V output / 500 mA - enables regulation from 5.25 V input down to 5 V output with minimal headroom loss. |
| ADJ Pin Voltage | 1.25 V ±2% at 25°C - sets output via R1/R2 divider; enables 1.25 V to 9 V adjustable range with <100 µA minimum load requirement. |
| Quiescent Current | 55 µA typical - remains stable across 100 µA–500 mA load; drops to 1 µA in shutdown (EN = low). |
| PSRR | 55 dB at 1 kHz - suppresses ripple from noisy DC-DC stages feeding the LDO input, critical for analog/sensor power domains. |
| Output Noise | 0.7 µV/√Hz (10 Hz–10 kHz) - low-noise performance suitable for ADC references and RF bias rails. |
| Thermal Shutdown | Activates at 160°C junction temperature - protects against sustained overload; recovers at ~150°C with hysteresis. |
Pinout & Package
SOT-223-5 package (6.50 mm × 3.56 mm body) with exposed thermal pad on bottom; pin 1 = IN, pin 2 = ADJ, pin 3 = OUT, pin 4 = GND, pin 5 = EN. GND pin serves as primary thermal path and circuit ground; EN pin requires explicit logic-level drive (no internal pullup/pulldown).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input supply connection | Accepts 2.7 V–10 V; both IN pins required for WSON variants - not applicable here (SOT-223 has single IN). |
| ADJ (Pin 2) | Reference feedback node | 1.25 V reference point; connects to resistor divider (R1/R2) to set VOUT = 1.25 × (1 + R1/R2); leakage <100 nA. |
| OUT (Pin 3) | Regulated output | Delivers up to 500 mA; stable with ≥1 µF ceramic capacitor (ESR 5–500 mΩ); low noise and high PSRR. |
| GND (Pin 4) | Power and signal ground | Thermally coupled to die; must be soldered to large copper plane for thermal management; ground current ≤55 µA at full load. |
| EN (Pin 5) | Enable control input | Logic-compatible input: <0.4 V = OFF (1 µA IQ), >1.8 V = ON; no hysteresis; requires external termination. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output capacitor | Eliminates need for larger tantalum or aluminum electrolytics - reduces board area and cost in space-constrained portable designs. |
| PMOS pass transistor architecture | Enables ultra-low ground current (<100 µA) independent of load, input voltage, or temperature - improves system efficiency in battery operation. |
| Adjustable output (1.25 V–9 V) | Supports dynamic voltage scaling and multi-rail systems using only two external resistors - no fixed-voltage BOM proliferation. |
| Foldback current limiting | Protects against short-circuit faults by reducing current as VOUT collapses - limits power dissipation during output shorts. |
| –40°C to +125°C guaranteed operation | Validated across full industrial temperature range - suitable for under-hood automotive modules and ruggedized industrial controllers. |
Applications
| Hard Disk Drive Power Management | Notebook Computer Core Rails |
|---|---|
Use Scenario: Regulating 3.3 V or 2.5 V for HDD servo controller and interface logic under variable battery input (7–12 V). IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, low-noise voltage to sensitive analog front-end and SERDES circuits. Use Value: 0.7 µV/√Hz noise and 55 dB PSRR prevent bit errors; 250 mV dropout extends runtime during battery sag. |
Use Scenario: Providing adjustable 1.8 V or 1.2 V core voltage to CPU I/O or memory subsystems with dynamic load steps. IC Role / Device Role / Timing Role: Enable-controlled LDO enabling fast power sequencing and deep-sleep state entry/exit. Use Value: 1 µA shutdown current minimizes battery drain in suspend mode; EN pin allows precise timing control via system MCU. |
| Battery-Powered Portable Instrumentation | Industrial Sensor Signal Conditioning |
Use Scenario: Powering 24-bit delta-sigma ADCs and precision op-amps in handheld multimeters or data loggers. IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from noisy digital domains. Use Value: 1.25 V reference accuracy and <5% load/line regulation ensure measurement repeatability across battery discharge cycle. |
Use Scenario: Supplying isolated 5 V or 3.3 V to bridge sensors, RTDs, or strain gauges in factory-floor transmitters. IC Role / Device Role / Timing Role: Stable, thermally robust local regulator compensating for ambient temperature swings (–40°C to +85°C). Use Value: Guaranteed specs over –40°C to +125°C and thermal shutdown prevent field failures in unventilated enclosures. |
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 Grade 0), integrated watchdog and reset; higher quiescent current (30 µA vs 55 µA active). | Designed for ASIL-B safety-critical ECUs; includes diagnostic features absent in LP38693SDX-ADJ/NOPB. | Select when functional safety compliance and system monitoring are required - not a direct replacement due to added complexity and pinout mismatch. |
| MCP1826T-ADJ/DC | Same 500 mA rating and 1.25 V reference; lower dropout (200 mV @ 500 mA), but requires ≥2.2 µF output capacitance for stability. | Optimized for cost-sensitive consumer electronics; lacks EN pin and thermal hysteresis specification. | Choose for higher efficiency where board space permits larger output cap and enable control is unnecessary. |
Compared with TLS850F0TESA1 and MCP1826T-ADJ/DC, LP38693SDX-ADJ/NOPB uniquely balances ultra-low-noise operation, 1-µF ceramic stability, and integrated enable in a standard SOT-223 footprint - making it optimal for portable instrumentation and non-safety-critical embedded systems requiring design simplicity and proven reliability.
Availability
LP38693SDX-ADJ/NOPB is available at Aetrix Electronics and suitable for hard disk drives, notebook computers, battery-powered devices, portable instrumentation, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP38693SDX-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 specializing in analog and embedded processing technologies, with leadership in power management ICs and precision analog solutions.
The LP3869x family was designed specifically for portable, battery-powered digital systems requiring fast start-up, low quiescent current, and stable regulation with miniature ceramic capacitors - targeting space- and efficiency-constrained applications.
FAQ
What is the minimum output capacitor required for stable operation of LP38693SDX-ADJ/NOPB?
The LP38693SDX-ADJ/NOPB is stable with a minimum 1-µF ceramic output capacitor (ESR 5–500 mΩ). X7R or X5R dielectrics are recommended for stable capacitance across voltage and temperature. Z5U/Y5V types are discouraged due to severe capacitance loss under bias and temperature extremes.
Does LP38693SDX-ADJ/NOPB support shutdown mode, and what is its quiescent current in that state?
Yes - LP38693SDX-ADJ/NOPB supports shutdown via the EN pin. When EN is pulled low (<0.4 V), the device enters shutdown mode with quiescent current reduced to 1 µA maximum. The EN pin has no internal pull-up or pull-down, so external termination is mandatory for reliable state control.
What is the output voltage adjustment range supported by LP38693SDX-ADJ/NOPB?
LP38693SDX-ADJ/NOPB supports an output voltage range of 1.25 V to 9 V, set externally using two resistors (R1 and R2) connected to the ADJ pin per VOUT = 1.25 × (1 + R1/R2). The ADJ pin voltage is trimmed to 1.25 V ±2% at 25°C and ±5% over –40°C to +125°C.
How does the foldback current limiting function in LP38693SDX-ADJ/NOPB during output short-circuit conditions?
In LP38693SDX-ADJ/NOPB, foldback current limiting reduces output current as VOUT collapses. When VIN–VOUT exceeds 5 V, current limits to ~350 mA; when ΔV falls below 4 V, limit rises to ~850 mA. This protects the device during sustained shorts while minimizing power dissipation and thermal stress.
Is LP38693SDX-ADJ/NOPB qualified for automotive applications?
No - LP38693SDX-ADJ/NOPB is not AEC-Q100 qualified. For automotive use, TI offers the pin-compatible LP38693-ADJ-Q1 variant (AEC-Q100 Grade 1, –40°C to +125°C), which shares identical electrical specs but adds automotive qualification and enhanced ESD robustness (2000 V HBM).
LP38693SDX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- 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:
- 500mA
- Current - Quiescent (Iq):
- 55 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- 55dB (120Hz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LP38693SDX-ADJ/NOPB FAQ
1.How can I place an order for LP38693SDX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38693SDX-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 LP38693SDX-ADJ/NOPB reliable?
The price and inventory of LP38693SDX-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 LP38693SDX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LP38693SDX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38693SDX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38693SDX-ADJ/NOPB?
LP38693SDX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38693SDX-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 LP38693SDX-ADJ/NOPB?
For technical support, including LP38693SDX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38693SDX-ADJ/NOPB requirements.
6.How does Aetrix verify that LP38693SDX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38693SDX-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 LP38693SDX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LP38693SDX-ADJ/NOPB?
All LP38693SDX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38693SDX-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 LP38693SDX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LP38693SDX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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