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Texas Instruments LP2987IM-3.8/NOPB
- Part No.:
- LP2987IM-3.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2987IM-3.8/NOPB.pdf
- Description:
- IC REG LINEAR 3.8V 200MA 8SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP2987IM-3.8/NOPB from Texas Instruments is a fixed-output 200 mA ultra-low-dropout linear voltage regulator with programmable power-on reset delay, designed for precision power management in portable electronics. It delivers 3.8 V output at ±0.5% accuracy (A-grade), maintains 180 mV dropout at 200 mA load, and features <2 µA shutdown quiescent current - enabling use in battery-powered cellular phones and camcorders where low-noise, stable biasing is critical.
For engineers reviewing the LP2987IM-3.8/NOPB datasheet, LP2987IM-3.8/NOPB pinout, LP2987IM-3.8/NOPB application, or LP2987IM-3.8/NOPB equivalent, key selection considerations include its SOIC-8 package, 3.8 V fixed output, integrated error flag/reset functionality, and compatibility with single-capacitor POR timing - all verified per TI SNVS004J (Rev. J, April 2013).
Technical Context
The LP2987IM-3.8/NOPB employs a vertically integrated PNP (VIP) pass transistor architecture to achieve ultra-low dropout and low ground pin current across load range. Its internal bandgap reference and error amplifier enable 0.5% output voltage accuracy over −40°C to +125°C junction temperature, with ripple rejection of 65 dB at 1 kHz.
Power-on reset is implemented via an external capacitor on the DELAY pin, sourcing 2.2 µA to generate precise delay times; the open-collector ERROR pin asserts low when output drops >5% below nominal, serving dual roles as fault indicator and reset signal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.8 V, ±0.5% accuracy (A-grade) at room temperature - ensures stable bias for analog sensors and RF front-ends without external feedback. |
| Max Output Current | 200 mA continuous, >250 mA peak - supports moderate-power microcontrollers and peripheral ICs in compact handheld devices. |
| Dropout Voltage | 180 mV @ 200 mA load (typical) - enables operation from 4.0 V input while maintaining regulation, critical for single-cell Li-ion or dual-cell alkaline systems. |
| Quiescent Current | <2 µA in shutdown mode - extends battery life in always-on standby circuits such as real-time clocks or wake-up controllers. |
| Operating Input Range | 2.1 V to 16 V - accommodates wide input sources including unregulated wall adapters and automotive-derived supplies. |
| Reset Threshold | Output voltage drop ≥5% triggers ERROR pin low - provides reliable system-level power-fail detection for safe MCU shutdown or data retention. |
| Thermal Range | −40°C to +125°C junction temperature - qualified for industrial and automotive under-hood auxiliary power applications. |
Pinout & Package
LP2987IM-3.8/NOPB is housed in an 8-pin SOIC (D) surface-mount package (Package Drawing D0008A), with 1.27 mm pitch, 4.9 mm × 3.9 mm body size, and moisture sensitivity level (MSL) Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BYPASS | Reference noise filter node | Not used on LP2987 (only present on LP2988); leave unconnected or grounded per layout best practice. |
| 2 - DELAY | Reset delay timing input | Accepts external capacitor to set power-on reset delay time; 2.2 µA current source charges CDLY to 1.23 V threshold. |
| 3 - GROUND | Analog ground reference | Low-impedance return path for regulator core and error comparator; must connect to clean analog ground plane. |
| 4 - INPUT | Main supply input | Accepts 2.1–16 V input; requires ≥2.2 µF ceramic or tantalum capacitor within 12.7 mm of pin for stability. |
| 5 - SENSE | Output voltage feedback | Monitors regulated output via internal resistive divider; connects directly to VOUT for highest accuracy (no remote sensing). |
| 6 - OUTPUT | Regulated power output | Delivers 3.8 V at up to 200 mA; requires ≥4.7 µF output capacitor with appropriate ESR (e.g., 1–10 Ω for 3.8 V). |
| 7 - SHUTDOWN | Enable/disable control | Drives high (>1.6 V) to enable, low (<0.18 V) to enter sub-2 µA sleep mode; slew rate ≥40 mV/µs required. |
| 8 - ERROR | Open-collector fault/reset flag | Sinks current when output drops >5%; requires external pull-up resistor to define logic-high level for MCU interrupt or reset input. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 180 mV @ 200 mA enables operation from marginal input rails - e.g., 4.0 V input sustains 3.8 V output under full load. |
| Programmable POR delay | Single external capacitor on DELAY pin sets reset timeout (e.g., 0.1 µF ≈ 56 ms); eliminates need for discrete RC timers or dedicated reset ICs. |
| High-accuracy output | ±0.5% tolerance (A-grade) over temperature ensures consistent performance for ADC references and precision analog circuitry. |
| Low ground current | 1 mA @ 200 mA load (typical) improves efficiency vs. standard LDOs - reduces thermal load and PCB copper area requirements. |
| Integrated protection | Thermal shutdown and current limiting prevent damage during overload or short-circuit events without external components. |
Applications
| Cellular Phone Power Management | Camcorder Audio Bias Supply |
|---|---|
Use Scenario: Regulating battery voltage to power baseband processor I/O and RF transceiver analog sections. IC Role / Device Role / Timing Role: Primary LDO delivering stable 3.8 V rail with POR sequencing for synchronized boot. Use Value: 180 mV dropout extends usable battery range by ~200 mV per cell; 0.5% accuracy prevents ADC gain drift in RF calibration routines. |
Use Scenario: Providing low-noise bias to microphone preamplifiers and audio DACs in handheld video recorders. IC Role / Device Role / Timing Role: Fixed-output LDO supplying clean analog VCC with fast transient response to dynamic audio loads. Use Value: Low ground current (1 mA @ 200 mA) minimizes IR drop in shared PCB traces; ERROR flag enables automatic mute on brownout. |
| Laptop Keyboard Backlight Driver | Industrial Sensor Node MCU Core Supply |
Use Scenario: Powering white LED driver ICs requiring tightly regulated 3.8 V input for constant-current control. IC Role / Device Role / Timing Role: Precision voltage source enabling accurate LED current setting independent of battery voltage sag. Use Value: 0.5% output tolerance ensures consistent backlight brightness across charge cycles; SOIC-8 footprint simplifies layout in space-constrained hinge regions. |
Use Scenario: Supplying 3.8 V to ultra-low-power ARM Cortex-M0+ microcontroller and environmental sensors in battery-operated field nodes. IC Role / Device Role / Timing Role: Main system regulator with integrated POR and shutdown control for energy harvesting and deep-sleep modes. Use Value: Sub-2 µA shutdown current enables multi-year battery life; ERROR pin signals MCU to save state before brownout-induced reset. |
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 |
|---|---|---|---|
| LP2987IM-3.3/NOPB | 3.3 V fixed output; identical SOIC-8 package, pinout, and electrical specs except output voltage. | Used where system logic requires 3.3 V instead of 3.8 V - e.g., interfacing with 3.3 V FPGAs or digital baseband ICs. | Select when target rail matches 3.3 V; no layout change needed beyond output capacitor re-rating. |
| LP2987IM-5.0/NOPB | 5.0 V fixed output; same SOIC-8 footprint, thermal characteristics, and POR/shutdown functionality. | Applicable in legacy USB-peripheral designs or analog subsystems requiring 5 V bias (e.g., op-amp rails, legacy sensor interfaces). | Choose for 5 V systems; verify input headroom sufficiency (min 5.2 V input for full 200 mA load). |
Compared with LP2987IM-3.3/NOPB and LP2987IM-5.0/NOPB, the LP2987IM-3.8/NOPB provides unique voltage matching for 3.8 V lithium battery nominal voltages and specific RF IC bias requirements - avoiding inefficient post-regulation or resistor-divider losses.
Availability
LP2987IM-3.8/NOPB is available at Aetrix Electronics and suitable for cellular phone power management, camcorder audio biasing, and industrial sensor node MCU core supply requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LP2987IM-3.8/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 decades of expertise in precision power management ICs.
The LP2987 family was engineered for micropower, ultra-low-dropout regulation in portable and battery-sensitive applications - emphasizing accuracy, low quiescent current, and integrated power sequencing functions.
FAQ
What is the output voltage tolerance of the LP2987IM-3.8/NOPB over temperature?
The LP2987IM-3.8/NOPB is an "A-grade" device with ±0.5% output voltage tolerance specified at room temperature (25°C), and ±0.8% over the full −40°C to +125°C junction temperature range per TI SNVS004J Rev. J. This ensures predictable performance in thermally demanding environments like automotive infotainment modules or outdoor sensor housings.
Does the LP2987IM-3.8/NOPB support power-on reset functionality?
Yes, the LP2987IM-3.8/NOPB implements programmable power-on reset using an external capacitor on the DELAY pin. A 2.2 µA internal current source charges the capacitor; when voltage reaches 1.23 V, the ERROR pin transitions high. For example, a 0.22 µF capacitor yields ~123 ms delay - verified in TI's Electrical Characteristics table and Figure 47.
Can the LP2987IM-3.8/NOPB be used with ceramic output capacitors?
Yes, but only with a series resistor. The LP2987IM-3.8/NOPB requires minimum ESR for stability; typical ceramic capacitors have ESR too low (<100 mΩ), risking oscillation. TI recommends adding a 1 Ω resistor in series with ceramic output capacitors - confirmed in Application Hints section of SNVS004J.
What is the maximum input voltage rating for the LP2987IM-3.8/NOPB?
The LP2987IM-3.8/NOPB has an absolute maximum input voltage rating of +16 V (survival) and an operating input range of 2.1 V to +16 V. Exceeding 16 V risks permanent damage; sustained operation above 12 V should consider thermal derating due to increased power dissipation in the SOIC-8 package (θJ−A = 160°C/W).
Is the BYPASS pin used on the LP2987IM-3.8/NOPB?
No. The BYPASS pin is exclusive to the LP2988 low-noise variant and is not functional on the LP2987IM-3.8/NOPB. Per TI's Connection Diagram (Figure 1) and datasheet text, it must be left unconnected or tied to ground - no bypass capacitor is required or supported for this part number.
LP2987IM-3.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 3.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.35V @ 200mA
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 120 µA
- Current - Supply (Max):
- 3.7 mA
- PSRR:
- 65dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LP2987IM-3.8/NOPB FAQ
1.How can I place an order for LP2987IM-3.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2987IM-3.8/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 LP2987IM-3.8/NOPB reliable?
The price and inventory of LP2987IM-3.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2987IM-3.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP2987IM-3.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2987IM-3.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2987IM-3.8/NOPB?
LP2987IM-3.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2987IM-3.8/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 LP2987IM-3.8/NOPB?
For technical support, including LP2987IM-3.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2987IM-3.8/NOPB requirements.
6.How does Aetrix verify that LP2987IM-3.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2987IM-3.8/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 LP2987IM-3.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP2987IM-3.8/NOPB?
All LP2987IM-3.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2987IM-3.8/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 LP2987IM-3.8/NOPB part is unused and in its original packaging.
Return procedure for LP2987IM-3.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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