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Texas Instruments LP3992IMF-1.5/NOPB
- Part No.:
- LP3992IMF-1.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3992IMF-1.5/NOPB.pdf
- Description:
- IC REG LINEAR 1.5V 30MA SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP3992IMF-1.5/NOPB from Texas Instruments (formerly National Semiconductor) is a micropower, low-noise CMOS LDO voltage regulator delivering a precise 1.5V ±90mV output from as low as 1.9V input, with 29µA typical quiescent current and logic-controlled shutdown. It serves as the primary power source for ultra-low-power microcontrollers, real-time clocks, and memory backup circuits in portable battery systems.
For engineers reviewing the LP3992IMF-1.5/NOPB datasheet, LP3992IMF-1.5/NOPB pinout, LP3992IMF-1.5/NOPB application, or LP3992IMF-1.5/NOPB equivalent, key selection criteria include its 1.9V minimum input voltage, 30mA guaranteed output current, 300µVRMS output noise, SOT23-5 package footprint, and fast 15µs turn-on/turn-off timing under load.
Technical Context
The LP3992IMF-1.5/NOPB employs a CMOS pass transistor architecture optimized for ultra-low quiescent current and operation near battery depletion voltages. Its internal reference and error amplifier are designed for stability with 1.0µF ceramic output capacitors, eliminating need for larger electrolytics or ESR-matching networks.
Shutdown control is implemented via an active-low SD pin with defined thresholds (VIL ≤0.4V, VIH ≥1.15V), enabling direct interfacing with 1.8V–5.2V logic families. Thermal shutdown activates at 160°C with 20°C hysteresis, and short-circuit protection limits output current to 90mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.5V ±90mV over −40°C to +125°C - ensures stable core voltage for 1.5V logic and SRAM retention |
| Input Voltage Range | 1.9V to 5.2V - supports single-cell Li-ion, NiMH, and alkaline battery operation down to end-of-life |
| Quiescent Current | 29µA typical at 1mA load - extends battery life in always-on sensor nodes and RTC keep-alive circuits |
| Shutdown Current | <1.5µA - reduces system standby power to near-zero without external disconnect switches |
| Output Noise | 300µVRMS (10Hz–1MHz) - minimizes jitter in clock-sensitive analog and RF subsystems |
| Load Current | Guaranteed 30mA - sufficient for low-power MCUs, EEPROMs, and digital sensors |
| Stability Capacitor | 1.0µF ceramic (X7R/Y5V/Z5U) - enables compact, low-cost PCB layout with no ESR constraints |
Pinout & Package
SOT23-5 (MF05A) package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, thermal pad not present. RoHS-compliant, MSL1 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Regulator input supply | Accepts 1.9–5.2V; requires local 1µF ceramic decoupling within 1cm of pin |
| GND (Pin 2) | Power ground reference | Common return path for input/output capacitors and load; must connect to clean analog ground plane |
| SD (Pin 3) | Active-low shutdown control | Pull ≤0.4V to disable regulator (IQ <1.5µA); pull ≥1.15V to enable; compatible with 1.8V logic |
| COUT (Pin 4) | Output capacitor connection | Internally tied to VOUT; recommended node for 1.0µF ceramic capacitor to ensure stability |
| VOUT (Pin 5) | Regulated output voltage | Delivers 1.5V ±90mV to load; may be used directly if COUT is shorted to VOUT per layout guidance |
Key Features
| Feature | Design Value |
|---|---|
| Low-input-voltage operation | Starts regulation at 1.9V input - enables use with single-cell batteries down to ~1.95V under load |
| Logic-compatible shutdown | VIH = 1.15V, VIL = 0.4V - interfaces directly with 1.8V I/O without level-shifting |
| Fast transient response | 60mV line/load transient deviation - maintains regulation during MCU wake-up bursts |
| Thermal & short-circuit protection | 160°C shutdown with 20°C hysteresis and 90mA current limit - prevents damage during fault conditions |
| No-load stability | Maintains regulation with zero load - critical for CMOS RAM keep-alive and sensor biasing applications |
Applications
| Real-Time Clock (RTC) Power Supply | Low-Power Microcontroller Core |
|---|---|
Use Scenario: Providing continuous 1.5V bias to an RTC IC during main system power-down or battery switchover. IC Role / Device Role / Timing Role: Primary low-quiescent LDO supplying regulated voltage to RTC oscillator and calendar registers. Use Value: 29µA quiescent current and no-load stability extend coin-cell life beyond 10 years; 1.5V output matches standard RTC core voltage requirements. | Use Scenario: Powering the core logic of an ultra-low-power MCU (e.g., MSP430, nRF52832) in sleep mode with periodic wake-up events. IC Role / Device Role / Timing Role: Main system LDO delivering stable 1.5V to MCU VDD_CORE during active and deep-sleep states. Use Value: 1.9V minimum input allows operation until battery reaches 1.95V; fast 15µs turn-on ensures immediate core availability after wake-up interrupt. |
| SRAM Memory Backup | Wireless Sensor Node Bias |
Use Scenario: Maintaining data integrity in 1.5V SRAM during main power loss using a backup coin cell or supercapacitor. IC Role / Device Role / Timing Role: Standby LDO ensuring uninterrupted 1.5V supply to volatile memory array during brown-out conditions. Use Value: Shutdown current <1.5µA minimizes backup source drain; ±90mV output tolerance guarantees SRAM data retention across temperature. | Use Scenario: Supplying regulated 1.5V to analog front-end (AFE), ADC, and BLE radio in a battery-powered environmental sensor. IC Role / Device Role / Timing Role: Precision LDO powering noise-sensitive analog circuitry and RF transceiver baseband sections. Use Value: 300µVRMS output noise prevents signal degradation in sub-1Vpp sensor signals; PSRR of 40dB @1kHz suppresses switching noise from DC-DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P152MR | 1.5V fixed output, 250mA max, 1µA shutdown current, SOT23-3 package (no SD pin) | Lacks logic-controlled shutdown; requires external enable circuitry for power sequencing | Select when higher output current is needed and shutdown control is handled externally |
| Diodes Inc. AP2112K-1.5TRG1 | 1.5V fixed output, 600mA max, 60µA quiescent current, SOT23-5 with SD pin, but 2.5V min input | Higher IQ and 2.5V minimum input limit usable battery range compared to LP3992IMF-1.5/NOPB | Select when higher load current is required and input stays above 2.5V; not suitable for deep battery discharge |
Compared with XC6206P152MR and AP2112K-1.5TRG1, the LP3992IMF-1.5/NOPB uniquely combines 1.9V minimum input, 29µA quiescent current, and integrated logic-compatible shutdown in SOT23-5 - making it optimal for longest battery life in deeply discharged portable systems.
Availability
LP3992IMF-1.5/NOPB is available at Aetrix Electronics and suitable for portable medical monitors, industrial IoT edge sensors, and automotive cabin controllers requiring stable component supply, long-term lifecycle support, and guaranteed performance across −40°C to +125°C.
Supply support for LP3992IMF-1.5/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 acquired National Semiconductor in 2011 and maintains full legacy product support, including datasheets, SPICE models, and application notes for all former NSC regulators.
The LP3992IMF-1.5/NOPB belongs to TI's precision micropower LDO family, engineered specifically for battery-constrained applications where extended runtime, low-noise operation, and seamless power-state transitions are critical.
FAQ
What is the minimum input voltage required for LP3992IMF-1.5/NOPB to maintain regulation?
The LP3992IMF-1.5/NOPB maintains regulation down to 1.9V input across the full temperature range (−40°C to +125°C). This enables reliable operation with single-cell alkaline, NiMH, or Li-ion batteries nearing end-of-discharge. Below 1.9V, the output drops linearly with input; the device does not latch or shut down abruptly at the threshold.
Can LP3992IMF-1.5/NOPB operate without an output load?
Yes, the LP3992IMF-1.5/NOPB remains stable and in regulation with zero load current - a key feature confirmed in the datasheet's "No-Load Stability" section. This makes LP3992IMF-1.5/NOPB ideal for memory backup, RTC keep-alive, and other always-on ultra-low-power functions where load current may drop to 0µA for extended periods.
What output capacitor types and values are validated for LP3992IMF-1.5/NOPB?
The LP3992IMF-1.5/NOPB is characterized and guaranteed stable with a 1.0µF ceramic capacitor (X7R, Y5V, or Z5U dielectric) having ESR between 5mΩ and 500mΩ. Tantalum or film capacitors are possible but not recommended due to larger size, higher cost, and ESR sensitivity - the LP3992IMF-1.5/NOPB design specifically optimizes for small ceramic solutions.
How does the shutdown pin (SD) of LP3992IMF-1.5/NOPB interface with common logic families?
The SD pin of LP3992IMF-1.5/NOPB is active-low with VIL ≤0.4V and VIH ≥1.15V, making it directly compatible with 1.8V CMOS logic outputs without level shifters. When pulled to GND, LP3992IMF-1.5/NOPB enters shutdown drawing <1.5µA; when tied to VIN or a ≥1.15V logic high, it enables regulation. Internal input current is ≤0.001µA, minimizing drive burden.
Is LP3992IMF-1.5/NOPB suitable for automotive applications?
The LP3992IMF-1.5/NOPB is specified for −40°C to +125°C junction temperature and features thermal shutdown (160°C) and short-circuit protection - meeting baseline requirements for under-hood and cabin modules. However, it is not AEC-Q200 qualified; for automotive-grade deployment, consult TI's AEC-Q200-certified alternatives such as the TPS7A05 series, while LP3992IMF-1.5/NOPB remains appropriate for non-safety-critical infotainment or comfort systems.
LP3992IMF-1.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.2V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 30mA
- Current - Quiescent (Iq):
- 50 µA
- Current - Supply (Max):
- -
- PSRR:
- 40dB ~ 30dB (1kHz ~ 20kHz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LP3992IMF-1.5/NOPB FAQ
1.How can I place an order for LP3992IMF-1.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3992IMF-1.5/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 LP3992IMF-1.5/NOPB reliable?
The price and inventory of LP3992IMF-1.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3992IMF-1.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP3992IMF-1.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3992IMF-1.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3992IMF-1.5/NOPB?
LP3992IMF-1.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3992IMF-1.5/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 LP3992IMF-1.5/NOPB?
For technical support, including LP3992IMF-1.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3992IMF-1.5/NOPB requirements.
6.How does Aetrix verify that LP3992IMF-1.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3992IMF-1.5/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 LP3992IMF-1.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP3992IMF-1.5/NOPB?
All LP3992IMF-1.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3992IMF-1.5/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 LP3992IMF-1.5/NOPB part is unused and in its original packaging.
Return procedure for LP3992IMF-1.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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