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Texas Instruments LP38690DTX-2.5
- Part No.:
- LP38690DTX-2.5
- Manufacturer:
- Texas Instruments
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
LP38690DTX-2.5.pdf
- Description:
- IC REG LINEAR 2.5V 1A TO252-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,073
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Product details
Overview
LP38690DTX-2.5 from Texas Instruments is a 2.5 V fixed-output, 1-A low-dropout CMOS linear regulator in TO-252 (DPAK) package, featuring 2.5% output accuracy at 25°C, 450 mV dropout at 1 A (VOUT = 5 V), and stable operation with only 1-µF ceramic output capacitance. It delivers precision voltage regulation for battery-powered microcontroller cores in notebook computers and portable instrumentation.
For engineers reviewing the LP38690DTX-2.5 datasheet, LP38690DTX-2.5 pinout, LP38690DTX-2.5 application, or LP38690DTX-2.5 equivalent, key selection criteria include dropout voltage at 2.5 V output, ground pin current under full load, thermal shutdown threshold, foldback current limiting behavior, and compatibility with ultra-low-ESR ceramic capacitors without external compensation.
Technical Context
The LP38690DTX-2.5 uses a PMOS pass transistor to eliminate DC base drive current, enabling ground pin current of just 55 µA (typical) at full 1-A load - independent of input voltage or temperature. Its trimmed bandgap reference and internal feedback network ensure ±2.5% output tolerance over –40°C to +125°C operating junction range.
No enable pin is present; the device operates continuously when input voltage exceeds 2.7 V and VIN ≥ (VOUT + VDO). Foldback current limiting activates based on VIN–VOUT differential: ~450 mA limit when differential > 5 V, ~1500 mA when < 4 V. Thermal shutdown engages at 160°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±2.5% at 25°C; maintains regulation across –40°C to +125°C junction range |
| Max Output Current | 1 A continuous; limited by thermal resistance (RθJA = 50.5°C/W in TO-252) and ambient conditions |
| Dropout Voltage | 450 mV typical at 1 A and VOUT = 5 V; for 2.5 V output, 800 mV max at 1 A and –40°C to +125°C |
| Ground Pin Current | 55 µA typical at full 1-A load; remains <100 µA across load, input, and temperature ranges |
| Input Voltage Range | 2.7 V to 10 V; no UVLO circuit - regulation begins only when VIN ≥ (VOUT + VDO) or 2.7 V, whichever is higher |
| Quiescent Current | 55 µA typical (100 µA max) from 100 µA to 1 A load; drops to 1 µA only in LP38692 with EN = LOW |
| Stability | Guaranteed stable with ≥1-µF ceramic output capacitor; no ESR requirement or external compensation needed |
Pinout & Package
LP38690DTX-2.5 is housed in a 3-pin TO-252 (DPAK) package with exposed thermal pad (DAP) soldered to PCB copper for enhanced heat dissipation. The package measures 6.58 mm × 6.10 mm and features low thermal resistance (RθJB = 29.7°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated output terminal | Delivers stable 2.5 V to load; connects directly to output capacitor and load; no SNS pin in TO-252 variant |
| 2 (GND) | Circuit ground / thermal tab | Reference node for regulation; thermally connected to die and PCB copper plane; must be soldered for full current capability |
| 3 (IN) | Unregulated input supply | Accepts 2.7–10 V input; requires ≥1-µF ceramic input capacitor close to pin; no enable or sense functionality |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Transistor | Eliminates base drive current, keeping ground pin current ≤100 µA regardless of load, input, or temperature |
| Ceramic-Capacitor Stability | Operates stably with ≥1-µF X5R/X7R ceramic output capacitor - no minimum ESR or external compensation required |
| Wide Temperature Range | Specified performance from –40°C to +125°C junction temperature; output accuracy and dropout validated across full range |
| Foldback Current Limit | Automatically reduces current limit from ~1500 mA (at low VIN–VOUT) to ~450 mA (at high VIN–VOUT) to manage power dissipation |
| Thermal Shutdown | Disables output at ~160°C junction temperature; resumes operation at ~150°C to prevent permanent damage during overload |
Applications
| Hard Disk Drive Power Rail | Notebook CPU Core Supply |
|---|---|
Use Scenario: Powers 2.5 V logic rails in 2.5-inch HDD servo controllers where space and thermal headroom are constrained. IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise 2.5 V to ASIC core logic with fast transient response to burst current demands. Use Value: 450 mV dropout enables operation from 3.3 V rail even under brownout; 55 µA ground current minimizes system standby power. |
Use Scenario: Supplies 2.5 V I/O voltage for embedded microcontrollers in ultraportable notebooks with aggressive thermal limits. IC Role / Device Role / Timing Role: Fixed-output LDO regulating auxiliary voltage domain; supports rapid load transients during CPU state transitions. Use Value: Stable with 1-µF ceramic capacitor saves board area vs. tantalum; TO-252 thermal pad allows 1 A continuous delivery at 60°C ambient. |
| Battery-Powered Data Logger | Portable Medical Sensor Module |
Use Scenario: Powers 2.5 V ADC reference and signal chain in coin-cell–operated environmental monitors. IC Role / Device Role / Timing Role: Low-quiescent LDO maintaining precision voltage during long sleep cycles and short active bursts. Use Value: 55 µA ground current extends battery life; ±2.5% output accuracy ensures measurement repeatability across temperature. |
Use Scenario: Supplies regulated 2.5 V to analog front-end amplifiers and low-power Bluetooth SoCs in handheld diagnostic devices. IC Role / Device Role / Timing Role: Noise-sensitive power source requiring low output noise (<0.7 µV/√Hz) and high PSRR (55 dB @ 120 Hz). Use Value: Ceramic-capacitor stability avoids electrolytic aging; thermal shutdown protects against enclosure overheating during extended use. |
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 | 2.5 V fixed, 150 mA max, SOIC-8; higher dropout (600 mV @ 150 mA), no thermal shutdown | Lower current, less demanding thermal environments; lacks foldback limiting and full-temp-range spec | Select only for sub-150 mA loads where cost and footprint outweigh performance requirements |
| TPS7A2025PDQNR | 2.5 V fixed, 300 mA max, X2SON-4; 165 mV dropout @ 300 mA, 6.5 µA IQ, but rated only to 125°C junction | Ultra-low IQ and smaller package; insufficient current and thermal margin for 1 A continuous use cases | Prefer for battery-critical, low-current subsystems; not suitable as direct replacement for 1 A LP38690DTX-2.5 loads |
Compared with TSS721AIDR and TPS7A2025PDQNR, LP38690DTX-2.5 uniquely supports 1 A continuous output with guaranteed 2.5% accuracy and thermal protection across –40°C to +125°C - making it the only viable choice for high-reliability, thermally constrained 2.5 V LDO applications demanding full industrial temperature compliance.
Availability
LP38690DTX-2.5 is available at Aetrix Electronics and suitable for notebook computers, hard disk drives, and portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature performance.
Supply support for LP38690DTX-2.5 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 solutions, with leadership in power management ICs for industrial, automotive, and computing markets.
The LP38690 series belongs to TI's precision low-dropout linear regulator product line, designed specifically for battery-powered digital systems requiring accurate, low-noise, ceramic-capacitor–stable voltage regulation with minimal ground current.
FAQ
What is the maximum output current specification for LP38690DTX-2.5?
The LP38690DTX-2.5 is rated for 1 A continuous output current under proper thermal conditions. Its actual deliverable current depends on ambient temperature, PCB copper area, and input-to-output voltage differential. With TO-252 package mounted on ≥1 in² 2-oz copper, it sustains 1 A up to 60°C ambient at VIN = 5 V. Derating applies above this point per RθJA = 50.5°C/W.
Does LP38690DTX-2.5 have an enable (EN) pin?
No, LP38690DTX-2.5 does not include an enable pin. It is a permanently enabled device that begins regulating when input voltage exceeds 2.7 V and VIN ≥ (VOUT + VDO). For designs requiring controlled startup, the LP38692 variant (e.g., LP38692SDX-2.5) provides an active-high EN pin with defined turn-on/turn-off thresholds.
What output capacitor value is required for stability with LP38690DTX-2.5?
LP38690DTX-2.5 is stable with a minimum 1-µF ceramic output capacitor (X5R or X7R dielectric). Unlike many LDOs, it imposes no minimum ESR requirement and needs no external compensation network. Larger values (e.g., 10 µF) improve transient response but are not required for stability.
How does the foldback current limit behave in LP38690DTX-2.5?
In LP38690DTX-2.5, foldback current limiting reduces output current as output voltage collapses. When VIN–VOUT > 5 V, current is limited to ~450 mA; when VIN–VOUT < 4 V, limit rises to ~1500 mA. This protects the device during sustained short-circuit or overload while minimizing power dissipation and thermal stress.
Is LP38690DTX-2.5 compatible with ceramic input capacitors?
Yes, LP38690DTX-2.5 requires only a 1-µF ceramic input capacitor placed close to the IN and GND pins. The device's internal design tolerates low-ESR ceramics without oscillation risk. Use X5R/X7R 0805 or larger case size for robust performance across temperature and bias.
LP38690DTX-2.5 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:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 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-2.5 FAQ
1.How can I place an order for LP38690DTX-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38690DTX-2.5 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-2.5 reliable?
The price and inventory of LP38690DTX-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38690DTX-2.5 is usually 5 days.
3.What payment methods are accepted for LP38690DTX-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38690DTX-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38690DTX-2.5?
LP38690DTX-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38690DTX-2.5 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-2.5?
For technical support, including LP38690DTX-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38690DTX-2.5 requirements.
6.How does Aetrix verify that LP38690DTX-2.5 is sourced from the original manufacturer or authorized distributors?
All LP38690DTX-2.5 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-2.5 meets industry standards.
7.What is the process for return or replacement of LP38690DTX-2.5?
All LP38690DTX-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LP38690DTX-2.5, 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-2.5 part is unused and in its original packaging.
Return procedure for LP38690DTX-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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