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Texas Instruments LP38692SDX-1.8/NOPB
- Part No.:
- LP38692SDX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38692SDX-1.8/NOPB.pdf
- Description:
- IC REG LINEAR 1.8V 1A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,641
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Product details
Overview
LP38692SDX-1.8/NOPB from Texas Instruments is a 1-A, 1.8-V fixed-output low-dropout CMOS linear regulator in a 5-pin SOT-223 package, featuring 2.5% output accuracy at 25°C, 950 mV dropout at 1 A (VOUT = 1.8 V), and an enable pin for power sequencing in portable battery-powered systems such as notebook CPUs and SSDs.
For engineers reviewing the LP38692SDX-1.8/NOPB datasheet, LP38692SDX-1.8/NOPB pinout, LP38692SDX-1.8/NOPB application, or LP38692SDX-1.8/NOPB equivalent, key selection criteria include dropout voltage at full load, thermal performance in compact layouts, EN pin logic thresholds across temperature, ground current stability under load, and compatibility with 1-µF ceramic output capacitors.
Technical Context
The LP38692SDX-1.8/NOPB uses a PMOS pass transistor to eliminate DC base drive current, enabling ground pin current of only 55 µA (typical) at full 1-A load - independent of input voltage or temperature. Its internal trimmed bandgap reference and error amplifier deliver ±2.5% output accuracy over –40°C to 125°C.
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 stable operation with ≥1-µF ceramic output capacitance - no ESR requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2.5% at 25°C; maintains regulation across –40°C to 125°C. |
| Max Output Current | 1 A continuous; limited by thermal design and dropout headroom. |
| Dropout Voltage | 950 mV at 1 A (VOUT = 1.8 V); defines minimum VIN required for regulation. |
| Quiescent Current | 55 µA typical at full load; enables ultra-low-power standby in battery systems. |
| Enable Threshold | VEN(ON) = 1.8 V min at VIN = 4 V; supports direct connection to 3.3-V logic rails. |
| PSRR | 55 dB at 120 Hz; suppresses ripple from noisy DC-DC pre-regulators. |
| Thermal Shutdown | Activates at 160°C junction temperature; hysteresis ensures clean recovery at ~150°C. |
Pinout & Package
LP38692SDX-1.8/NOPB is packaged in a 5-pin SOT-223 (NDC) with exposed thermal pad (DAP) on the bottom surface. The package measures 6.50 mm × 3.56 mm and provides low RθJB = 13.0°C/W for PCB-level heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN | Input supply voltage | Accepts 2.7 V to 10 V; must be ≥ (VOUT + VDO) for regulation. |
| 2: GND | Circuit ground / thermal path | Internally connected to die substrate and exposed pad; requires soldering to large copper plane for thermal performance. |
| 3: OUT | Regulated output | Delivers 1.8 V ±2.5%; stable with ≥1-µF ceramic capacitor (no ESR needed). |
| 4: SNS | Output sense input | Not present on SOT-223; reserved for WSON variants only - omitted here. |
| 5: EN | Enable control input | Active-high logic; pulls device ON when ≥1.8 V (VIN = 4 V); draws ≤1 µA leakage. |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Transistor | Eliminates base drive current → ground pin current remains ≤100 µA across full load, input, and temperature range. |
| Ceramic-Capacitor Stability | Stable with ≥1-µF X5R/X7R ceramic output capacitor; removes need for electrolytic or tantalum parts. |
| Foldback Current Limit | Adaptive current limit (450 mA to 1500 mA) based on VIN–VOUT differential - protects during short-circuit or low-VIN conditions. |
| Wide Input Range | Operates from 2.7 V to 10 V - supports single-cell Li-ion (2.7–4.2 V) and multi-cell or adapter inputs. |
| Low-Noise Regulation | 0.7 µV/√Hz output noise (10 Hz–10 kHz, VOUT = 3.3 V); suitable for noise-sensitive analog/digital cores. |
Applications
| Hard Disk Drive Power Rail | Notebook CPU Core Supply |
|---|---|
Use Scenario: Provides clean 1.8-V bias to HDD servo controller ICs requiring tight voltage tolerance and fast transient response during seek operations. IC Role / Device Role / Timing Role: Primary LDO regulator delivering regulated core voltage; handles 0–800-mA load steps with <400-mV undershoot (COUT = 1 µF). Use Value: 2.5% output accuracy ensures timing margin compliance; 950-mV dropout enables operation down to 2.75-V input from aging Li-ion cells. |
Use Scenario: Powers low-voltage I/O banks of Intel/AMD mobile processors where enable-controlled power gating reduces system standby current. IC Role / Device Role / Timing Role: Enable-controlled post-regulator; synchronized to chipset power-good signals for sequenced rail bring-up. Use Value: 1-µA off-state quiescent current extends battery life; EN pin threshold compatible with 3.3-V GPIO without level-shifting. |
| Portable Medical Sensor Module | Industrial IoT Edge Node |
Use Scenario: Supplies 1.8-V reference and ADC interface circuitry in handheld glucose meters and pulse oximeters operating from coin-cell or USB power. IC Role / Device Role / Timing Role: Precision analog supply rail; rejects switching noise from adjacent DC-DC converters via 55-dB PSRR at 120 Hz. Use Value: ±2.5% output tolerance over –40°C to 125°C ensures calibration stability across environmental extremes. |
Use Scenario: Powers BLE/Wi-Fi SoCs (e.g., CC2652, ESP32) in battery-operated gateways where thermal constraints limit heatsink area. IC Role / Device Role / Timing Role: Compact, thermally efficient 1-A LDO; leverages SOT-223's 13.0°C/W RθJB for high ambient operation. Use Value: Exposed pad soldered to 2-in² copper pour sustains 1-A load at 70°C ambient without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIDR | Fixed 1.8-V output, 1-A rating, but requires ≥2.2-V input; no enable pin; higher 1.2-V dropout at 1 A. | Lacks EN control and thermal shutdown; unsuitable for power-gated or safety-critical designs. | Select only if enable functionality and thermal protection are not required and input voltage stays ≥3.0 V. |
| TPS7A2018PDQNR | 1.8-V, 300-mA LDO with 170-mV dropout at 300 mA; 0.7-µA quiescent current; 6-pin WSON. | Lower current capability limits use to sub-300-mA loads; superior PSRR (70 dB) but smaller max load. | Prefer for ultra-low-IQ sensor nodes; avoid for 1-A applications like CPU I/O or HDD rails. |
Compared with TSS721AIDR and TPS7A2018PDQNR, LP38692SDX-1.8/NOPB uniquely delivers 1-A output with enable control, thermal shutdown, and 950-mV dropout at full load - making it the only option among the three qualified for thermally constrained, power-sequenced 1.8-V systems requiring robust fault protection.
Availability
LP38692SDX-1.8/NOPB is available at Aetrix Electronics and suitable for notebook computer power management, industrial IoT edge nodes, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP38692SDX-1.8/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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer applications.
The LP38692SDX-1.8/NOPB belongs to TI's precision low-dropout linear regulator product line, engineered specifically for battery-powered digital systems demanding accurate, low-noise, and thermally robust voltage regulation with minimal external components.
FAQ
What is the minimum input voltage required for LP38692SDX-1.8/NOPB to regulate 1.8 V output?
The LP38692SDX-1.8/NOPB requires VIN ≥ (VOUT + VDO). At 1 A load and 25°C, its dropout voltage is 950 mV - so minimum VIN is 2.75 V. Under worst-case conditions (–40°C to 125°C, 1 A), dropout rises to 1600 mV, requiring VIN ≥ 3.4 V for guaranteed regulation. The device also mandates VIN ≥ 2.7 V for internal circuit functionality regardless of dropout margin.
Does LP38692SDX-1.8/NOPB require an external resistor divider for output voltage setting?
No. LP38692SDX-1.8/NOPB is a fixed-output regulator with internally trimmed 1.8-V reference. It does not support adjustable output via external resistors. The SNS pin is not implemented in the SOT-223 package - only present in WSON variants - and is not used for feedback adjustment in this part.
Can LP38692SDX-1.8/NOPB operate with a 1-µF ceramic output capacitor?
Yes. LP38692SDX-1.8/NOPB is explicitly characterized and specified for stability with ≥1-µF ceramic output capacitors (X5R/X7R). Unlike older LDOs, it imposes no minimum ESR requirement - eliminating need for bulkier tantalum or aluminum electrolytic capacitors in space-constrained designs.
What is the thermal performance of LP38692SDX-1.8/NOPB in the SOT-223 package?
In the SOT-223 (NDC) package, LP38692SDX-1.8/NOPB achieves RθJB = 13.0°C/W (junction-to-board) when soldered to a 1-in² copper pad. With 2-in² copper, it sustains 1-A continuous output at 70°C ambient. Its RθJA = 68.5°C/W (junction-to-ambient, high-K board) means power dissipation must be limited to ~730 mW at 25°C ambient to stay below 125°C junction limit.
Is the EN pin of LP38692SDX-1.8/NOPB internally pulled up or down?
No. The EN pin of LP38692SDX-1.8/NOPB has no internal pull-up or pull-down. It must be actively driven or passively terminated - e.g., tied to IN for always-on operation, or connected to a microcontroller GPIO. Leaving it floating may cause erratic enable behavior due to noise coupling or leakage-induced partial turn-on.
LP38692SDX-1.8/NOPB 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.6V @ 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-1.8/NOPB FAQ
1.How can I place an order for LP38692SDX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38692SDX-1.8/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 LP38692SDX-1.8/NOPB reliable?
The price and inventory of LP38692SDX-1.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38692SDX-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP38692SDX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38692SDX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38692SDX-1.8/NOPB?
LP38692SDX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38692SDX-1.8/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 LP38692SDX-1.8/NOPB?
For technical support, including LP38692SDX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38692SDX-1.8/NOPB requirements.
6.How does Aetrix verify that LP38692SDX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38692SDX-1.8/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 LP38692SDX-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP38692SDX-1.8/NOPB?
All LP38692SDX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38692SDX-1.8/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 LP38692SDX-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP38692SDX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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