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Texas Instruments LP38690DTX-1.8/NOPB
- Part No.:
- LP38690DTX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LP38690DTX-1.8/NOPB.pdf
- Description:
- IC REG LINEAR 1.8V 1A TO252-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,776
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Product details
Overview
LP38690DTX-1.8/NOPB from Texas Instruments is a 1-A, 1.8-V fixed-output low-dropout CMOS linear regulator in a 3-pin TO-252 (DPAK) package, featuring 2.5% output accuracy at 25°C, 950 mV dropout at 1 A (VOUT = 1.8 V), and stable operation with only 1-µF ceramic output capacitance. It delivers precision voltage regulation for core power in space-constrained portable systems.
For engineers reviewing the LP38690DTX-1.8/NOPB datasheet, LP38690DTX-1.8/NOPB pinout, LP38690DTX-1.8/NOPB application, or LP38690DTX-1.8/NOPB equivalent, key selection criteria include dropout performance at 1.8 V, thermal behavior in TO-252 without enable functionality, ground pin current ≤100 µA across load/temperature, and compatibility with ultra-low-ESR ceramic capacitors in battery-powered designs.
Technical Context
The LP38690DTX-1.8/NOPB uses a PMOS pass transistor architecture, eliminating DC base drive current and enabling ground pin current as low as 55 µA at full load. Its trimmed bandgap reference and internal feedback network ensure ±2.5% output tolerance over –40°C to 125°C junction temperature.
No enable pin is present-unlike the LP38692 variant-making it a permanently enabled regulator. Thermal shutdown activates at 160°C with 10°C hysteresis, and foldback current limiting engages based on VIN–VOUT differential: ~450 mA limit when ΔV ≥ 5 V, ~1500 mA when ΔV ≤ 4 V.
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 resistance (RθJA = 50.5°C/W in TO-252) |
| Dropout Voltage | 950 mV at 1 A, VOUT = 1.8 V (25°C); rises to 1600 mV over full temp range |
| Ground Pin Current | 55 µA typical at full load; remains <100 µA regardless of input voltage or temperature |
| Input Voltage Range | 2.7 V to 10 V; no UVLO-regulation begins only when VIN ≥ (VOUT + VDO) or 2.7 V, whichever is higher |
| Stability Capacitor | Stable with ≥1 µF ceramic output capacitor; no ESR requirement |
| Quiescent Current | 55 µA typical (100 µA max) across full load and temperature range |
Pinout & Package
LP38690DTX-1.8/NOPB is housed in a 3-pin TO-252 (DPAK) thermally enhanced package (6.58 mm × 6.10 mm), with the exposed tab electrically and thermally connected to GND. The package supports high ambient temperature operation via PCB copper plane heat sinking.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated output terminal | Delivers stable 1.8 V; connects directly to load; requires ≥1 µF ceramic capacitor to GND |
| 2 (GND) | Circuit and thermal ground | Reference node for regulation; thermally coupled to die; must be soldered to large copper area for thermal management |
| 3 (IN) | Unregulated input supply | Accepts 2.7–10 V; requires ≥1 µF ceramic bypass capacitor close to pin |
Key Features
| Feature | Design Value |
|---|---|
| PMOS pass transistor | Eliminates base-drive current, enabling ground pin current <100 µA independent of load or temperature |
| Ceramic-capacitor stability | Guaranteed stable with 1-µF ceramic output capacitor-no ESR minimum required |
| Wide input range | Operates from 2.7 V to 10 V, supporting single-cell Li-ion, multi-cell alkaline, and intermediate bus rails |
| Thermal protection | Shuts down at 160°C junction temperature with 10°C hysteresis to prevent permanent damage |
| Foldback current limiting | Adaptive current limit: ~450 mA at high VIN–VOUT (>5 V), ~1500 mA at low differential (<4 V) |
Applications
| Hard Disk Drive Power | Notebook CPU Core Supply |
|---|---|
Use Scenario: Provides clean, low-noise 1.8-V bias for HDD preamplifier ICs and servo control logic. IC Role / Device Role / Timing Role: Primary LDO delivering regulated core voltage; replaces discrete regulators requiring larger capacitors. Use Value: 0.7 µV/√Hz output noise (10 Hz–10 kHz) and fast line/load transient response minimize signal corruption in analog front-end circuits. |
Use Scenario: Supplies 1.8-V I/O or auxiliary rail for Intel/AMD chipset components in ultraportable notebooks. IC Role / Device Role / Timing Role: Fixed-output LDO for non-critical but noise-sensitive subsystems adjacent to high-speed digital logic. Use Value: TO-252 thermal resistance (RθJB = 29.7°C/W) enables full 1-A load in compact layouts without heatsinks. |
| Battery-Powered IoT Sensor Node | Portable Medical Instrumentation |
Use Scenario: Powers 1.8-V microcontroller peripherals (ADC, UART, RTC) in coin-cell or LiPo-powered edge sensors. IC Role / Device Role / Timing Role: Low-quiescent, always-on regulator maintaining system readiness during deep-sleep modes. Use Value: 55 µA ground current ensures minimal battery drain-critical for >5-year shelf life in sealed devices. |
Use Scenario: Delivers stable 1.8-V supply to precision analog front-ends in handheld ECG or pulse oximetry units. IC Role / Device Role / Timing Role: Precision voltage source for low-drift op-amps and reference buffers requiring tight DC accuracy. Use Value: ±2.5% output tolerance over –40°C to 125°C ensures calibration integrity across clinical operating environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIDR | 250-mA rated, SOIC-8; higher dropout (600 mV @ 250 mA), lower IQ (35 µA) | Not suitable for 1-A loads; better for ultra-low-power sub-systems with tighter IQ budgets | Select if load current ≤250 mA and quiescent current is prioritized over output current capability |
| TPS7A2018PDQNR | 1-A, 1.8-V, X2SON-4; 170 mV dropout @ 1 A; 6.5-µA IQ; no thermal shutdown | Lacks thermal protection; requires external current limiting; smaller footprint but lower thermal margin | Choose for space-constrained designs where thermal derating is managed externally and ultra-low dropout is critical |
Compared with TSS721AIDR and TPS7A2018PDQNR, LP38690DTX-1.8/NOPB provides the only combination of 1-A capability, integrated thermal shutdown, TO-252 thermal robustness, and guaranteed ceramic-capacitor stability-making it uniquely suited for ruggedized, medium-power portable applications where reliability under thermal stress is mandatory.
Availability
LP38690DTX-1.8/NOPB is available at Aetrix Electronics and suitable for hard disk drives, notebook computers, and battery-powered devices requiring stable component supply with long-term industrial lifecycle support.
Supply support for LP38690DTX-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 specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and portable applications.
The LP38690 series belongs to TI's precision low-dropout linear regulator product line, designed specifically for battery-powered and thermally demanding applications where ceramic capacitor compatibility, low ground current, and wide input range are essential.
FAQ
What is the dropout voltage of LP38690DTX-1.8/NOPB at 1 A and 125°C?
The dropout voltage of LP38690DTX-1.8/NOPB is specified at 1600 mV maximum at 1 A load and full temperature range (−40°C to 125°C), per Electrical Characteristics Table 6.5 in the SNVS322M datasheet. This reflects worst-case thermal and process variation, ensuring reliable regulation even under elevated junction temperatures.
Does LP38690DTX-1.8/NOPB have an enable pin?
No, LP38690DTX-1.8/NOPB does not include an enable (EN) pin. It is a permanently enabled device-unlike the LP38692 variant-which simplifies circuit design but removes external ON/OFF control. The LP38690DTX-1.8/NOPB begins regulating as soon as VIN exceeds the minimum operating threshold (~2.7 V).
Can LP38690DTX-1.8/NOPB be used with a 1-µF ceramic output capacitor?
Yes, LP38690DTX-1.8/NOPB is explicitly characterized and guaranteed stable with a single 1-µF ceramic output capacitor-no ESR requirement. This is confirmed in the Features section and Typical Application schematic (Figure 30) of the SNVS322M datasheet, enabling compact, low-BOM-count designs.
What is the thermal resistance (RθJA) of LP38690DTX-1.8/NOPB in its TO-252 package?
The junction-to-ambient thermal resistance (RθJA) for LP38690DTX-1.8/NOPB in the TO-252 package is 50.5°C/W, as specified in Section 6.4 (Thermal Information) of the SNVS322M datasheet. This value assumes standard JEDEC High-K test board conditions and confirms suitability for 1-A operation in moderate ambient environments with adequate PCB copper area.
Is LP38690DTX-1.8/NOPB RoHS-compliant and lead-free?
Yes, LP38690DTX-1.8/NOPB carries the "/NOPB" suffix, indicating lead-free (Pb-free) and RoHS-compliant construction per TI's packaging standards. The device meets J-STD-020 moisture sensitivity level (MSL) 3 and is qualified for reflow soldering per IPC/JEDEC J-STD-020.
LP38690DTX-1.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- TO-252-3
LP38690DTX-1.8/NOPB FAQ
1.How can I place an order for LP38690DTX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38690DTX-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 LP38690DTX-1.8/NOPB reliable?
The price and inventory of LP38690DTX-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 LP38690DTX-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP38690DTX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38690DTX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38690DTX-1.8/NOPB?
LP38690DTX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38690DTX-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 LP38690DTX-1.8/NOPB?
For technical support, including LP38690DTX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38690DTX-1.8/NOPB requirements.
6.How does Aetrix verify that LP38690DTX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38690DTX-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 LP38690DTX-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP38690DTX-1.8/NOPB?
All LP38690DTX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38690DTX-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 LP38690DTX-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP38690DTX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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