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Texas Instruments LP38693SDX-1.8/NOPB
- Part No.:
- LP38693SDX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38693SDX-1.8/NOPB.pdf
- Description:
- IC REG LINEAR 1.8V 500MA 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,503
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Product details
Overview
LP38693SDX-1.8/NOPB from Texas Instruments is a 500-mA, 1.8-V fixed-output CMOS low-dropout linear regulator in a 6-pin WSON package with exposed thermal pad. It features 250 mV dropout at 500 mA (VOUT = 5 V), ±2% output accuracy over –40°C to 125°C, 1-µA off-state quiescent current, and enable control (EN) for power sequencing in battery-powered systems.
For engineers reviewing the LP38693SDX-1.8/NOPB datasheet, LP38693SDX-1.8/NOPB pinout, LP38693SDX-1.8/NOPB application, or LP38693SDX-1.8/NOPB equivalent, key selection considerations include dropout voltage at 1.8 V output, EN pin logic thresholds, remote sense capability (SNS), thermal performance in WSON-6, and compatibility with 1-µF ceramic output capacitors.
Technical Context
The LP38693SDX-1.8/NOPB uses a PMOS pass transistor enabling ultra-low ground pin current (55 µA typical at full load) independent of input voltage or temperature. Its internal trimmed bandgap reference and foldback current limiting (350 mA at VIN–VOUT > 5 V; 850 mA at < 4 V) support stable operation under transient and overload conditions.
Designed for ceramic-capacitor stability, it operates across 2.7 V to 10 V input with no minimum load requirement above 100 µA. The SNS pin-exclusive to WSON variants-enables remote voltage sensing to compensate for PCB trace IR drop, ensuring regulation accuracy at the load point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2% (25°C), ±4% (–40°C to 125°C); enables direct powering of 1.8-V logic cores without external feedback. |
| Max Output Current | 500 mA continuous; sufficient for microcontrollers, FPGAs, and RF ICs in portable instrumentation. |
| Dropout Voltage | 250 mV typical at 500 mA (VOUT = 5 V); at 1.8 V output, dropout remains ≤450 mV (full temp range), supporting operation down to VIN = 2.25 V. |
| Quiescent Current | 100 µA typical (full load); drops to 1 µA in shutdown (EN low), critical for battery runtime extension. |
| PSRR | 55 dB at 120 Hz (1 Vp-p ripple); suppresses switching noise from upstream DC/DC converters feeding the LDO. |
| Thermal Shutdown | Activates at 160°C junction temperature with 10°C hysteresis; protects against sustained overload in compact enclosures. |
| Enable Threshold | VEN(MIN) = 1.8 V (VIN = 4 V), 3 V (VIN = 6 V), 4 V (VIN = 10 V); ensures robust logic-level compatibility with 1.8-V/3.3-V GPIOs. |
Pinout & Package
The LP38693SDX-1.8/NOPB is housed in a 6-pin WSON package (3.0 mm × 3.0 mm, 0.8-mm height) with an exposed thermal pad (DAP) on the bottom for enhanced heat dissipation. The DAP must be soldered to a PCB copper plane per TI AN-1187 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input supply connection (dual pins: 1 & 6) | Both IN pins must be tied together externally; each rated for 250 mA max-ensures current sharing and low-inductance path for high-frequency transients. |
| OUT | Regulated output voltage node | Primary power rail for load; connects to 1-µF ceramic capacitor for stability and low-noise operation. |
| SNS | Remote output voltage sense input | Must be connected directly to load-side VOUT to cancel PCB trace resistance error; improves regulation accuracy by up to 50 mV at 500 mA. |
| GND | Analog and power ground reference | Low-impedance return path for control circuitry; ties to PCB ground plane adjacent to DAP for optimal thermal and noise performance. |
| EN | Active-high enable control input | Pull high ≥1.8 V (min) to activate regulator; pull low ≤0.4 V to disable and reduce IQ to 1 µA; no internal pullup/pulldown requires explicit termination. |
| DAP | Exposed thermal pad | Electrically connected to GND internally; soldering to ≥100 mm² copper area reduces RθJA from 50.6°C/W to ~25°C/W, enabling full 500 mA at 85°C ambient. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output capacitor | Eliminates need for large tantalum or electrolytic caps-reduces board area, cost, and aging-related failure modes in space-constrained designs. |
| PMOS pass transistor architecture | Maintains ground pin current ≤100 µA across full load, input, and temperature range-preserves system-level efficiency and simplifies current-sense design. |
| Remote sense (SNS) pin | Compensates for up to 100 mΩ PCB trace resistance between regulator and load, ensuring ±2% accuracy at point-of-load rather than at regulator pins. |
| Foldback current limiting | Reduces short-circuit current as output collapses-limits power dissipation during fault conditions and eases thermal design margining. |
| 1-µA shutdown quiescent current | Extends battery life in always-on subsystems (e.g., real-time clocks, sensor wake-up circuits) without requiring external disconnect switches. |
Applications
| Hard Disk Drive Power Management | Notebook Computer Core Logic Supply |
|---|---|
Use Scenario: Regulating 1.8-V I/O voltage for SATA controller ASICs in 2.5-inch HDDs with tight thermal constraints and burst current demands. IC Role / Device Role / Timing Role: Primary low-noise, fast-transient LDO delivering clean 1.8-V rail with remote sensing to maintain voltage at ASIC pins despite flex-cable voltage drop. Use Value: Enables compliance with SATA 3.0 power integrity specs (<50 mV ripple) while sustaining 500 mA peak loads during seek operations. |
Use Scenario: Supplying 1.8-V core voltage to embedded controller (EC) and touchpad interface in ultrabook platforms with aggressive power gating. IC Role / Device Role / Timing Role: Enable-controlled LDO providing sequenced 1.8-V power to EC during boot and sleep/wake transitions. Use Value: 1-µA shutdown current extends battery standby time by >15% versus standard LDOs; EN pin allows precise firmware-controlled power cycling. |
| Battery-Powered Portable Instrumentation | Industrial IoT Sensor Node |
Use Scenario: Powering 1.8-V ADCs, op-amps, and microcontroller peripherals in handheld multimeters with single-cell Li-ion (3.0–4.2 V) input. IC Role / Device Role / Timing Role: Main system LDO delivering stable 1.8-V rail with minimal dropout to maximize usable battery capacity down to 2.25 V. Use Value: 250 mV dropout at 500 mA enables >92% battery energy utilization vs. 400 mV alternatives-extending runtime by 18 minutes per charge cycle. |
Use Scenario: Providing regulated 1.8-V supply to ultra-low-power wireless SoCs (e.g., CC2652R) in battery-operated environmental sensors deployed for 10+ years. IC Role / Device Role / Timing Role: Always-on LDO with remote sense maintaining precision voltage at SoC VDD despite long PCB traces in modular sensor housings. Use Value: ±2% accuracy over –40°C to 125°C ensures ADC reference stability across outdoor temperature extremes without calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LDR | 7-channel 100-mA sink driver with integrated LDO; 1.8-V output not available-requires external resistor divider for adjustable version. | Targeted at LED/relay driving, not precision point-of-load regulation; lacks SNS pin and thermal shutdown hysteresis. | Select only if multi-channel sinking is required alongside regulation; not a functional replacement for LP38693SDX-1.8/NOPB's single-rail, high-accuracy role. |
| TPS7A0518PDBVR | 200-mA, 1.8-V LDO in SOT-23-5; 17 µA IQ (active), 500 nA shutdown; 300 mV dropout at 200 mA-lower current rating and no SNS pin. | Optimized for ultra-low-power wearables; insufficient for 500 mA loads in instrumentation or storage applications. | Choose when board space and sub-µA shutdown dominate over current capability and remote sensing-e.g., coin-cell-powered sensors. |
Compared with TPL7407LDR and TPS7A0518PDBVR, the LP38693SDX-1.8/NOPB uniquely delivers 500 mA at 1.8 V with remote sense and thermal protection in a thermally efficient WSON package-making it the only viable option for high-current, precision point-of-load regulation in space- and thermal-constrained industrial and computing systems.
Availability
LP38693SDX-1.8/NOPB is available at Aetrix Electronics and suitable for hard disk drives, notebook computers, battery-powered devices, portable instrumentation, and industrial IoT sensor nodes requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LP38693SDX-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 leader specializing in analog and embedded processing technologies, with over 90 years of innovation in power management ICs.
The LP38693SDX-1.8/NOPB belongs to TI's LP3869x family of low-dropout regulators designed specifically for portable, battery-powered digital systems demanding high accuracy, low quiescent current, and ceramic-capacitor stability.
FAQ
What is the minimum input voltage required for LP38693SDX-1.8/NOPB to regulate 1.8 V output?
The LP38693SDX-1.8/NOPB requires VIN ≥ (VOUT + VDO). At 500 mA and 25°C, VDO is 450 mV for 1.8-V output-so minimum VIN is 2.25 V. However, the device's recommended operating range starts at 2.7 V to ensure full functionality of internal circuitry, including enable logic and thermal protection.
Can LP38693SDX-1.8/NOPB operate without the SNS pin connected?
Yes-LP38693SDX-1.8/NOPB functions normally with SNS tied directly to OUT, as specified in the datasheet. Leaving SNS unconnected is not allowed; it must be shorted to OUT externally. Remote sensing is optional but provides measurable improvement in load regulation accuracy when PCB trace resistance exceeds ~20 mΩ.
Does LP38693SDX-1.8/NOPB require an input capacitor?
Yes-a minimum 1-µF ceramic capacitor is required between IN and GND for stability, per TI's design guidelines. This capacitor must be placed within 1 cm of the IN pin and connected to a clean analog ground plane to minimize inductance and ensure loop stability across all operating conditions.
What happens to LP38693SDX-1.8/NOPB during thermal shutdown?
When junction temperature reaches ~160°C, LP38693SDX-1.8/NOPB disables its output and enters thermal shutdown. It remains off until temperature falls to ~150°C (10°C hysteresis), then resumes regulation. Repeated cycling indicates inadequate heatsinking or excessive power dissipation-designers must verify PD = (VIN – 1.8 V) × ILOAD stays within thermal limits.
Is LP38693SDX-1.8/NOPB pin-compatible with LP38691SDX-1.8/NOPB?
No-LP38693SDX-1.8/NOPB includes EN and SNS pins, while LP38691SDX-1.8/NOPB has N/C and GND in those positions. Pinouts differ: LP38693SDX-1.8/NOPB uses pins 3 (EN) and 5 (SNS); LP38691SDX-1.8/NOPB uses pins 3 (N/C) and 5 (GND). PCB layout changes are required for substitution.
LP38693SDX-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):
- -
- Current - Output:
- 500mA
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LP38693SDX-1.8/NOPB FAQ
1.How can I place an order for LP38693SDX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38693SDX-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 LP38693SDX-1.8/NOPB reliable?
The price and inventory of LP38693SDX-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 LP38693SDX-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP38693SDX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38693SDX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38693SDX-1.8/NOPB?
LP38693SDX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38693SDX-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 LP38693SDX-1.8/NOPB?
For technical support, including LP38693SDX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38693SDX-1.8/NOPB requirements.
6.How does Aetrix verify that LP38693SDX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38693SDX-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 LP38693SDX-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP38693SDX-1.8/NOPB?
All LP38693SDX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38693SDX-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 LP38693SDX-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP38693SDX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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