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Texas Instruments LP38691QSD-2.5/NOPB
- Part No.:
- LP38691QSD-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LP38691QSD-2.5/NOPB.pdf
- Description:
- IC REG LINEAR 2.5V 500MA 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,656
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Product details
Overview
LP38691QSD-2.5/NOPB from Texas Instruments is a 2.5 V, 500-mA low-dropout CMOS linear regulator in a 6-pin WSON package with exposed thermal pad, featuring 2% output accuracy (25°C), 250 mV typical dropout at 500 mA (VOUT = 5 V), and stable operation with only 1-µF ceramic output capacitance. It serves as a precision voltage source for microcontroller core rails and analog subsystems in space-constrained portable electronics.
For engineers reviewing the LP38691QSD-2.5/NOPB datasheet, LP38691QSD-2.5/NOPB pinout, LP38691QSD-2.5/NOPB application, or LP38691QSD-2.5/NOPB equivalent, key selection considerations include its 2.7–10 V input range, 55 µA ground current at full load, thermal shutdown at 160°C, foldback current limiting, and absence of enable functionality-distinguishing it from the LP38693 variant.
Technical Context
The LP38691QSD-2.5/NOPB uses a PMOS pass transistor architecture, eliminating DC base-drive current and enabling ground pin current to remain below 100 µA across all load, input voltage, and temperature conditions. Its trimmed bandgap reference and internal feedback network deliver tight DC regulation without external resistors.
It operates within –40°C to 125°C junction temperature range, supports ceramic capacitors down to 1 µF for stability, and incorporates thermal overload protection with 10°C hysteresis and foldback current limiting that scales output current based on VIN–VOUT differential-e.g., ~350 mA limit when VIN–VOUT > 5 V and ~850 mA when < 4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±2% (25°C); ensures stable power for ADC references and sensor biasing circuits. |
| Max Output Current | 500 mA; sufficient for powering single-core MCUs or low-power FPGA I/O banks. |
| Dropout Voltage | 250 mV typical at 500 mA (VOUT = 5 V); enables operation from 2.75 V input at full load for 2.5 V rail. |
| Ground Current | 55 µA typical at full load; minimizes system quiescent power in battery-backed applications. |
| Input Voltage Range | 2.7 V to 10 V; compatible with single-cell Li-ion (3.0–4.2 V), dual-cell alkaline (2.7–3.6 V), and 5 V/9 V wall adapters. |
| Thermal Shutdown | Activates at 160°C junction temperature with 10°C hysteresis; protects against sustained overloads without external circuitry. |
| Output Capacitor | Stable with ≥1 µF ceramic (X5R/X7R); eliminates need for high-ESR tantalum or electrolytic capacitors, reducing board area and cost. |
Pinout & Package
The LP38691QSD-2.5/NOPB is housed in a 6-pin WSON (NGG) package (3.0 mm × 3.0 mm) 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 |
|---|---|---|
| 1 (IN) | Input supply connection | Primary power input; must be tied to Pin 6 (second IN) for full 500 mA capability in WSON package. |
| 2 (GND) | Power ground reference | Low-impedance return path; thermally connected to die; requires solid copper pour under DAP for thermal performance. |
| 3 (OUT) | Regulated output | Delivers fixed 2.5 V; connects directly to load; remote sensing via SNS pin not supported on LP38691. |
| 4 (SNS) | Sense input (WSON only) | Must be tied directly to OUT pin; enables remote voltage sensing to compensate for PCB trace IR drop (not used in LP38691QSD-2.5/NOPB configuration). |
| 5 (NC) | No internal connection | Unbonded pin; must be left floating or grounded per layout best practices; no electrical function. |
| 6 (IN) | Secondary input supply connection | Redundant IN pin required in WSON package; electrically identical to Pin 1; both must be connected to same input net. |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Transistor | Enables ground current ≤100 µA regardless of load or input voltage-critical for ultra-low-power standby modes. |
| Trimmed Bandgap Reference | Delivers 2% output accuracy over –40°C to 125°C without external calibration components. |
| Foldback Current Limiting | Automatically reduces output current as VIN–VOUT increases (e.g., 350 mA limit at >5 V differential), preventing thermal runaway during input overvoltage. |
| Thermal Overload Protection | Shuts down output at 160°C junction temp and recovers at ~150°C, providing self-protection without external thermal sensors. |
| Ceramic-Capacitor Stability | Guaranteed stable with 1 µF X5R/X7R ceramic output capacitor-reduces BOM count and footprint vs. traditional LDOs requiring 10–22 µF tantalum. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Powering low-noise analog front-ends (AFE) and 24-bit sigma-delta ADCs in handheld blood glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Provides clean, stable 2.5 V reference and bias voltage for precision measurement circuits; no switching noise contamination. Use Value: 0.7 µV/√Hz output noise and <100 mV load regulation error ensure sub-0.01% measurement accuracy across temperature and load. |
Use Scenario: Supplying isolated 2.5 V logic rails for digital isolators and RS-485 transceivers in factory automation controllers. IC Role / Device Role / Timing Role: Delivers regulated voltage to interface ICs requiring tight tolerance and high PSRR to reject field-induced noise on long cables. Use Value: 55 dB ripple rejection at 120 Hz and –40°C to 125°C guaranteed operation support robust industrial deployment. |
| Automotive Body Control Units | Wearable Fitness Trackers |
Use Scenario: Powering CAN transceiver bias and microcontroller peripherals in non-safety-critical automotive modules (e.g., door control, lighting). IC Role / Device Role / Timing Role: Supplies 2.5 V rail compliant with AEC-Q100 Grade 1 (–40°C to 125°C) requirements; no enable pin needed for always-on functions. Use Value: Qualified per AEC-Q100-002 HBM ±2000 V ESD and thermal shutdown prevent field failures in harsh under-hood environments. |
Use Scenario: Regulating voltage for ultra-low-power Bluetooth SoCs and MEMS accelerometers in compact wearable devices. IC Role / Device Role / Timing Role: Acts as primary power stage after battery protection IC; optimized for intermittent 500 mA peak loads and <1 µA off-state leakage. Use Value: 1 µF ceramic stability and 55 µA ground current extend battery life beyond 7 days in active monitoring mode. |
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 |
|---|---|---|---|
| TLS850F0TES/V33 | Fixed 3.3 V output; integrated watchdog and reset generator; higher quiescent current (30 µA typ) | Targeted at automotive MCU power sequencing; includes safety features absent in LP38691QSD-2.5/NOPB | Select when system-level functional safety (ASIL-B) or reset supervision is required alongside regulation. |
| MCP1700T-2502E/MB | 250 mA max output; SOT-23 package; 6 µA quiescent current; no thermal shutdown or foldback limiting | Better suited for micropower sensor nodes where 500 mA is unnecessary and board space is extreme | Choose for ultra-low-IQ designs with <250 mA load and no thermal stress risk. |
Compared with TLS850F0TES/V33 and MCP1700T-2502E/MB, the LP38691QSD-2.5/NOPB uniquely balances 500 mA capability, ceramic-capacitor stability, and automotive-grade thermal robustness in a 3×3 mm WSON package-making it optimal for space-constrained, medium-current precision analog rails where enable control is not required.
Availability
LP38691QSD-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive body electronics, and industrial PLC I/O modules requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LP38691QSD-2.5/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 consumer markets.
The LP3869x family was designed for portable, battery-powered digital systems requiring fast start-up, high accuracy, and minimal external components-targeting applications where small size, low dropout, and ceramic-capacitor compatibility are critical.
FAQ
What is the maximum input voltage rating for LP38691QSD-2.5/NOPB?
The LP38691QSD-2.5/NOPB has an absolute maximum input voltage of 12 V, but its recommended operating range is 2.7 V to 10 V. Exceeding 10 V may degrade long-term reliability or trigger thermal shutdown under load; operation above 12 V risks permanent damage per Absolute Maximum Ratings table in SNVS321O.
Does LP38691QSD-2.5/NOPB include an enable (EN) pin?
No, the LP38691QSD-2.5/NOPB does not have an enable pin. It is always-on when input voltage is applied within specification. The EN pin is exclusive to the LP38693 variant; LP38691QSD-2.5/NOPB lacks this feature and cannot be externally disabled.
Can LP38691QSD-2.5/NOPB operate with a 1-µF output capacitor?
Yes, the LP38691QSD-2.5/NOPB is explicitly characterized and guaranteed stable with a minimum 1-µF ceramic output capacitor (X5R/X7R). This eliminates the need for larger, higher-ESR capacitors and reduces solution size-confirmed in Section 4 (Typical Application Circuits) and Section 9.2.2.3 of the SNVS321O datasheet.
What is the thermal resistance (RθJA) of LP38691QSD-2.5/NOPB in its WSON package?
The LP38691QSD-2.5/NOPB in the 6-pin WSON (NGG) package has a junction-to-ambient thermal resistance (RθJA) of 50.6°C/W under High-K board conditions. This value assumes proper PCB layout with the exposed thermal pad (DAP) soldered to a ≥1 cm² copper plane, as specified in Section 7.5 and AN-1187.
Is LP38691QSD-2.5/NOPB qualified for automotive applications?
Yes, the LP38691QSD-2.5/NOPB is part of the LP38691-Q1 family, which is AEC-Q100 Grade 1 qualified (–40°C to 125°C). While the "/NOPB" suffix indicates lead-free packaging, the underlying die and qualification apply-confirmed in the Device Information table and Section 1 of SNVS321O.
LP38691QSD-2.5/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:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.73V @ 500mA
- 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)
LP38691QSD-2.5/NOPB FAQ
1.How can I place an order for LP38691QSD-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP38691QSD-2.5/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 LP38691QSD-2.5/NOPB reliable?
The price and inventory of LP38691QSD-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP38691QSD-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP38691QSD-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP38691QSD-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP38691QSD-2.5/NOPB?
LP38691QSD-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP38691QSD-2.5/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 LP38691QSD-2.5/NOPB?
For technical support, including LP38691QSD-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP38691QSD-2.5/NOPB requirements.
6.How does Aetrix verify that LP38691QSD-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP38691QSD-2.5/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 LP38691QSD-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP38691QSD-2.5/NOPB?
All LP38691QSD-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP38691QSD-2.5/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 LP38691QSD-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP38691QSD-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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