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Texas Instruments LP2987IM-2.8/NOPB
- Part No.:
- LP2987IM-2.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2987IM-2.8/NOPB.pdf
- Description:
- IC REG LINEAR 2.8V 200MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,870
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Product details
Overview
LP2987IM-2.8/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 low-noise power rails in portable electronics. It delivers 2.8 V ±0.5% (A-grade) output at up to 200 mA, features 180 mV dropout at full load, <2 µA shutdown quiescent current, and operates across −40°C to +125°C junction temperature. It is used in cellular phones and camcorders where stable, low-noise 2.8 V bias is required for baseband processors or image sensors.
For engineers reviewing the LP2987IM-2.8/NOPB datasheet, LP2987IM-2.8/NOPB pinout, LP2987IM-2.8/NOPB application, or LP2987IM-2.8/NOPB equivalent, key selection criteria include dropout voltage at 200 mA, reset delay configurability via external capacitor, ground pin current vs. load, error flag threshold accuracy, and SOIC-8 thermal performance (θJ−A = 160°C/W).
Technical Context
The LP2987IM-2.8/NOPB uses a vertically integrated PNP (VIP) pass transistor architecture to achieve ultra-low dropout and low ground current across load range. Its internal error amplifier compares a resistive-sensed output against a 1.23 V bandgap reference, enabling precise regulation and tight line/load regulation (0.014%/V typical).
Power-on reset functionality is implemented via an internal 2.2 µA current source charging an external capacitor on the DELAY pin; the ERROR pin asserts low until the capacitor reaches 1.23 V, providing a user-programmable reset timeout. The open-collector ERROR output has 220 mV low-level voltage at 300 µA sink current and supports external pull-up for system reset signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.8 V ±0.5% (A-grade) at 25°C - ensures stable bias for 2.8 V logic or analog circuitry without post-regulation trimming. |
| Max Output Current | 200 mA continuous - supports moderate-power microcontrollers, RF front-ends, or sensor signal chains. |
| Dropout Voltage | 180 mV @ 200 mA - enables operation from 3.0 V input while maintaining regulation, critical for single-cell Li-ion or Li-poly systems. |
| Quiescent Current | <2 µA in shutdown - preserves battery life during deep sleep modes in portable devices. |
| Error Flag Threshold | −5% output deviation (±1.5% hysteresis) - provides reliable undervoltage detection for safe system reset before functional failure. |
| Input Voltage Range | 2.1 V to 16 V - accommodates wide-input industrial or automotive auxiliary supplies while supporting low-voltage battery operation. |
| Operating Temperature | −40°C to +125°C junction - qualified for under-hood, industrial control, and ruggedized portable applications. |
Pinout & Package
LP2987IM-2.8/NOPB is housed in an 8-pin SOIC package (Package Drawing D0008A), with θJ−A = 160°C/W and RoHS-compliant matte tin (Cu–Sn) lead finish. Pin 1 is marked by a beveled corner; device marking reads "2987I M2.8".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BYPASS | Reference bypass node | Not connected on LP2987 (only active on LP2988); leave unconnected or tie to ground per layout best practice. |
| DELAY | Reset delay timing input | Accepts external capacitor to set power-on reset timeout; charged by 2.2 µA internal current source. |
| GROUND | Power return path | Carries 1 mA typical ground current at 200 mA load; requires low-impedance analog ground connection. |
| INPUT | Main supply input | Accepts 2.1–16 V input; must be decoupled with ≥2.2 µF ceramic capacitor within 0.5 inch of pin. |
| SENSE | Output voltage feedback | Monitors regulated output via internal resistor divider; connects directly to VOUT for standard configuration. |
| OUTPUT | Regulated 2.8 V output | Requires ≥4.7 µF output capacitor with appropriate ESR (e.g., 1–10 Ω tantalum) for stability. |
| SHUTDOWN | Enable/disable control | Drives regulator into sub-2 µA sleep mode when pulled below 0.18 V; requires >1.4 V to enable. |
| ERROR | Open-collector fault/reset flag | Sinks current when output drops >5%; requires external pull-up for active-high reset signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Power-On Reset Delay | Single external capacitor on DELAY pin sets reset timeout (e.g., 0.1 µF ≈ 56 ms); eliminates need for discrete RC timer or dedicated supervisor IC. |
| Ultra-Low Dropout Architecture | VIN–VOUT = 180 mV @ 200 mA enables use with 3.0 V input sources - critical for extending runtime in single-cell battery systems. |
| High Accuracy Output Regulation | ±0.5% over temperature and line/load - reduces need for downstream voltage calibration in precision analog or ADC reference rails. |
| Low Ground Pin Current | 1 mA @ 200 mA load (vs. >10 mA for many legacy LDOs) - minimizes total system power loss and improves efficiency at full load. |
| Integrated Overtemperature/Overcurrent Protection | Thermal shutdown and current limiting prevent damage during fault conditions without external circuitry - enhances system reliability. |
Applications
| Cellular Phone Baseband | Camcorder Image Sensor Bias |
|---|---|
|
Use Scenario: Powers baseband processor core or memory interface requiring clean, tightly regulated 2.8 V rail. IC Role / Device Role / Timing Role: Primary low-noise LDO delivering stable 2.8 V supply with fast transient response to dynamic processor loads. Use Value: 180 mV dropout allows operation from declining Li-ion cell voltage down to ~3.0 V, extending usable battery capacity. |
Use Scenario: Supplies analog front-end and pixel array of CMOS image sensor in handheld camcorders. IC Role / Device Role / Timing Role: Precision voltage source with error flag monitoring output integrity during video capture sequences. Use Value: ±0.5% output accuracy prevents gain drift in analog signal chain; ERROR pin triggers frame discard on undervoltage events. |
| Palmtop Computer I/O Peripherals | Portable Medical Diagnostic Sensor |
|
Use Scenario: Powers USB transceivers, SD card interfaces, or touch controller in compact palmtop computers. IC Role / Device Role / Timing Role: Secondary LDO generating isolated 2.8 V domain with independent enable and reset signaling. Use Value: SHUTDOWN pin enables software-controlled power gating; DELAY-configured reset ensures peripherals initialize after main CPU. |
Use Scenario: Provides excitation voltage for precision biosensor elements (e.g., glucose or ECG electrodes) in portable diagnostics. IC Role / Device Role / Timing Role: Low-drift, low-noise bias generator with fault reporting for safety-critical measurement circuits. Use Value: −40°C to +125°C rating supports clinical environments; 5% error threshold enables early warning of power degradation before measurement error exceeds limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC7701CP | Fixed 2.85 V output, no DELAY pin, higher 300 mV dropout @ 200 mA, 50 µA quiescent current in operation. | Lacks programmable reset delay and ultra-low IQ shutdown; suited for non-battery-critical, cost-sensitive designs. | Select TLC7701CP only if reset delay is unnecessary and higher dropout is acceptable in the input voltage margin. |
| TPS76328DBVR | 2.8 V output, 150 mV dropout @ 150 mA, 85 µA typical IQ, no integrated reset delay or ERROR flag. | Requires external supervisor IC for reset functionality; lower thermal resistance (θJ−A = 216°C/W in SOT-23) but smaller package. | Choose TPS76328DBVR when board space is constrained and external reset generation is already present in design. |
Compared with LP2987IM-2.8/NOPB, TLC7701CP trades reset programmability and micropower shutdown for lower cost and simpler BOM, while TPS76328DBVR offers better dropout and smaller footprint but adds complexity and cost via external reset circuitry.
Availability
LP2987IM-2.8/NOPB is available at Aetrix Electronics and suitable for cellular phone baseband, camcorder image sensor bias, and portable medical diagnostic sensor applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LP2987IM-2.8/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, embedded processing, and connectivity technologies, with decades of LDO design heritage and broad automotive/industrial qualification.
The LP2987 product line was engineered for micropower, ultra-low-dropout regulation in battery-powered portable electronics - emphasizing precision, low noise, and integrated power-management features like programmable reset.
FAQ
What is the output voltage tolerance of the LP2987IM-2.8/NOPB over temperature?
The LP2987IM-2.8/NOPB is an "A-grade" device with ±0.5% output voltage tolerance at 25°C and ±0.8% over the full −40°C to +125°C junction temperature range, as specified in the Electrical Characteristics table under ΔVO. This tight tolerance ensures consistent performance in thermally varying environments without external trimming.
Does the LP2987IM-2.8/NOPB support programmable power-on reset delay?
Yes, the LP2987IM-2.8/NOPB supports programmable power-on reset delay via its DELAY pin. An external capacitor (e.g., 0.1 µF) is charged by a 2.2 µA internal current source; the ERROR pin remains low until the capacitor voltage reaches 1.23 V, providing a user-defined reset timeout - no additional components are needed beyond the capacitor.
What is the maximum continuous output current for the LP2987IM-2.8/NOPB?
The LP2987IM-2.8/NOPB is rated for 200 mA continuous output current under specified thermal conditions. Peak output current exceeds 250 mA, and short-circuit current is internally limited to ~400 mA. Derating is required above ambient temperatures where power dissipation exceeds thermal limits of the SOIC-8 package (θJ−A = 160°C/W).
Can the LP2987IM-2.8/NOPB be used with ceramic output capacitors?
Yes, but only with series resistance: the LP2987IM-2.8/NOPB requires minimum ESR for stability, and typical ceramic capacitors have ESR too low (<1 Ω). A 1 Ω resistor must be placed in series with the ceramic output capacitor to meet stability requirements, whereas tantalum capacitors (e.g., 4.7 µF, 1–10 Ω ESR) work directly without added components.
Is the BYPASS pin used on the LP2987IM-2.8/NOPB?
No - the BYPASS pin is reserved for the LP2988 (low-noise variant) and is not functional on the LP2987IM-2.8/NOPB. TI documentation specifies that the BYPASS feature is exclusive to LP2988; on LP2987, the pin should be left unconnected or tied to ground per recommended layout practices to avoid noise coupling.
LP2987IM-2.8/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):
- 2.8V
- 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-2.8/NOPB FAQ
1.How can I place an order for LP2987IM-2.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2987IM-2.8/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-2.8/NOPB reliable?
The price and inventory of LP2987IM-2.8/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-2.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP2987IM-2.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2987IM-2.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2987IM-2.8/NOPB?
LP2987IM-2.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2987IM-2.8/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-2.8/NOPB?
For technical support, including LP2987IM-2.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2987IM-2.8/NOPB requirements.
6.How does Aetrix verify that LP2987IM-2.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2987IM-2.8/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-2.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP2987IM-2.8/NOPB?
All LP2987IM-2.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2987IM-2.8/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-2.8/NOPB part is unused and in its original packaging.
Return procedure for LP2987IM-2.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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