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Texas Instruments LP2988IM-3.2/NOPB
- Part No.:
- LP2988IM-3.2/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2988IM-3.2/NOPB.pdf
- Description:
- IC REG LINEAR 3.2V 200MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,317
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Product details
Overview
LP2988IM-3.2/NOPB from Texas Instruments is a micropower, 200 mA ultra-low-dropout linear voltage regulator with programmable power-on reset delay and bypass pin for noise reduction. It delivers 3.2 V output at ±0.5% accuracy (A-grade), 180 mV dropout at 200 mA, and 20 µVRMS output noise (BW = 300 Hz–50 kHz) when using 0.01 µF bypass capacitor. It serves as a precision low-noise supply in portable audio and imaging subsystems.
For engineers reviewing the LP2988IM-3.2/NOPB datasheet, LP2988IM-3.2/NOPB pinout, LP2988IM-3.2/NOPB application, or LP2988IM-3.2/NOPB equivalent, key selection criteria include its 3.2 V fixed output, ultra-low noise performance enabled by the BYPASS pin, integrated POR delay via single external capacitor, thermal shutdown, and compatibility with SOIC-8 footprint for space-constrained designs.
Technical Context
The LP2988IM-3.2/NOPB uses a vertically integrated PNP (VIP) pass transistor architecture to achieve ultra-low dropout and low ground current across load range. Its error amplifier references a stable 1.23 V bandgap, enabling precise output regulation and tight line/load transient response.
It integrates dual comparators: one monitors output voltage for reset assertion (−5% threshold), while the second controls POR timing via internal 2.2 µA current source charging an external DELAY capacitor. The BYPASS pin directly shunts high-frequency noise from the bandgap reference node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.2 V, ±0.5% tolerance over −40°C to +125°C junction temperature - ensures stable biasing of noise-sensitive analog circuitry without trimming. |
| Dropout Voltage | 180 mV @ 200 mA load - enables operation from 3.38 V input, critical for single-cell Li-ion or regulated 3.3 V rail applications. |
| Output Noise | 20 µVRMS (300 Hz–50 kHz) with 0.01 µF BYPASS capacitor - reduces phase noise in RF receivers and jitter in ADC clocking paths. |
| Power-On Reset Delay | Programmable via single external capacitor on DELAY pin - supports sequenced power-up in multi-rail systems without external timers. |
| Quiescent Current | <2 µA in shutdown mode - extends battery life in always-on sensor nodes and standby circuits. |
| Operating Input Range | 2.1 V to 16 V - accommodates wide-input industrial supplies and legacy 5 V/12 V rails while maintaining regulation down to near-VOUT. |
| Thermal Protection | Integrated overtemperature shutdown - prevents damage during sustained overload or poor PCB thermal design. |
Pinout & Package
LP2988IM-3.2/NOPB is packaged in SOIC-8 (D package, drawing D0008A), with exposed pad not present. Thermal resistance θJ−A = 160°C/W. Pin 1 is top-left corner, marked by dot or bevelled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BYPASS (Pin 1) | Bandgap reference bypass node | Connects 0.01 µF low-leakage ceramic (NPO/COG) to reduce output noise; leakage >1 nA degrades output accuracy. |
| DELAY (Pin 2) | POR timing control | Sinks 2.2 µA to ground until VOUT reaches 95%; then charges external CDELAY to generate reset timeout. |
| GROUND (Pin 3) | Power return path | Low-impedance analog ground connection; separate from digital ground to avoid noise coupling into reference circuitry. |
| INPUT (Pin 4) | Unregulated input supply | Accepts 2.1–16 V; requires ≥2.2 µF input capacitor within 0.5″ to suppress ripple and prevent instability. |
| SENSE (Pin 5) | Output voltage feedback | High-impedance sense input; connects directly to load for remote sensing to compensate trace IR drop. |
| OUTPUT (Pin 6) | Regulated output | Delivers up to 200 mA; requires ≥4.7 µF output capacitor with ESR between 0.1–10 Ω for stability. |
| SHUTDOWN (Pin 7) | Enable/disable control | Active-high logic; must exceed 1.6 V to enable, drop below 0.18 V to disable; slew rate ≥40 mV/µs required. |
| ERROR (Pin 8) | Open-collector reset flag | Asserts low when VOUT drops >5% below 3.2 V; requires external pull-up for microcontroller reset signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output noise | 20 µVRMS (300 Hz–50 kHz) with 0.01 µF BYPASS capacitor - meets stringent SNR requirements in audio DACs and RF front-ends. |
| Single-capacitor POR delay | Delay time set by CDELAY = TDELAY / 5.59×10⁵ - eliminates need for external RC timer ICs in portable system power sequencing. |
| 0.5% output accuracy (A-grade) | Guaranteed over full −40°C to +125°C range - enables direct replacement of higher-cost precision regulators in automotive and industrial sensors. |
| 180 mV dropout @ 200 mA | Enables >94% efficiency at 3.2 V out from 3.38 V input - maximizes usable battery voltage in coin-cell or single-LiFePO₄ applications. |
| Integrated protection | Thermal shutdown and current limiting - prevents latch-up and catastrophic failure during short-circuit or overtemperature events. |
Applications
| Portable Audio Power | Digital Imaging Sensor Bias |
|---|---|
|
Use Scenario: Powering stereo headphone amplifiers and MEMS microphone preamps in Bluetooth earbuds. IC Role / Device Role / Timing Role: Low-noise 3.2 V supply for analog signal chain; BYPASS pin suppresses switching noise from adjacent DC/DC converters. Use Value: 20 µVRMS noise floor preserves >100 dB SNR in 24-bit audio paths without requiring additional LDO filtering stages. |
Use Scenario: Providing clean bias voltage to CMOS image sensor analog front-end (AFE) and column ADC drivers. IC Role / Device Role / Timing Role: Precision 3.2 V reference for pixel readout circuitry; POR delay synchronizes sensor initialization with SoC boot sequence. Use Value: 0.5% output accuracy ensures consistent pixel gain calibration across temperature, reducing fixed-pattern noise in raw image data. |
| Industrial Data Acquisition | Medical Wearable Sensors |
|
Use Scenario: Supplying isolated signal conditioning circuits in 4–20 mA loop-powered transmitters. IC Role / Device Role / Timing Role: Low-quiescent 3.2 V regulator for op-amp and ADC bias; SHUTDOWN pin enables power cycling during sleep intervals. Use Value: <2 µA shutdown current extends loop-powered device battery life beyond 10 years in maintenance-free installations. |
Use Scenario: Powering ECG/PPG analog front-ends in patch-style patient monitors with coin-cell batteries. IC Role / Device Role / Timing Role: Micropower 3.2 V source with integrated reset; ERROR pin triggers MCU wake-up on brownout detection. Use Value: 180 mV dropout allows operation down to 3.38 V input, extracting maximum energy from CR2032 cells before end-of-life cutoff. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC7703IPW | 3.3 V fixed output, no BYPASS pin, 35 µVRMS noise, 350 mV dropout @ 200 mA | Lacks ultra-low-noise capability and POR delay; suited for non-audio digital loads only | Select when 3.3 V (not 3.2 V) output suffices and noise <30 µVRMS is acceptable |
| TPS7A2032PDQNR | 3.2 V output, 12 µVRMS noise, 130 mV dropout @ 200 mA, no DELAY/ERROR pins | Superior noise and dropout but lacks integrated POR and reset flag functionality | Select when lowest possible noise is critical and external reset IC can be added |
Compared with TLC7703IPW and TPS7A2032PDQNR, LP2988IM-3.2/NOPB uniquely combines 3.2 V precision, ultra-low noise, and integrated power-on reset in a single SOIC-8 package-enabling compact, self-timed analog subsystems without auxiliary timing components.
Availability
LP2988IM-3.2/NOPB is available at Aetrix Electronics and suitable for portable audio, medical wearables, industrial data acquisition, and digital imaging applications requiring stable component supply and long-term manufacturability.
Supply support for LP2988IM-3.2/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 LP2988IM-3.2/NOPB belongs to TI's micropower LDO family designed for noise-critical portable and industrial applications where ultra-low dropout, sub-µA shutdown, and integrated POR are essential.
FAQ
What is the minimum input voltage required for LP2988IM-3.2/NOPB to regulate at full 200 mA load?
The LP2988IM-3.2/NOPB requires a minimum input voltage of 3.38 V to maintain regulation at 200 mA load, based on its 180 mV typical dropout voltage (3.2 V + 0.18 V). Below this, output voltage collapses linearly with input. The absolute minimum operating input is 2.1 V, but regulation is not guaranteed below 3.38 V under full load.
How does the BYPASS pin reduce output noise in LP2988IM-3.2/NOPB?
The BYPASS pin connects directly to the bandgap reference node inside the LP2988IM-3.2/NOPB. A 0.01 µF NPO/COG ceramic capacitor shunts high-frequency noise from this node, preventing it from modulating the error amplifier and pass transistor. This achieves 20 µVRMS output noise - five times lower than the LP2987 variant without BYPASS.
Can LP2988IM-3.2/NOPB be used with ceramic output capacitors?
Yes, but only with series resistance. The LP2988IM-3.2/NOPB requires output capacitor ESR between 0.1 Ω and 10 Ω for stability. Standard ceramic capacitors have ESR < 10 mΩ, so a 1 Ω resistor must be placed in series with the ceramic output capacitor to meet stability criteria per TI Application Hints.
What is the function of the DELAY pin on LP2988IM-3.2/NOPB, and how is delay time calculated?
The DELAY pin sources a precise 2.2 µA current after VOUT reaches 95% of 3.2 V, charging an external capacitor to generate power-on reset timeout. Delay time is calculated as TDELAY = CDELAY × 5.59×10⁵. For example, a 100 nF capacitor yields ~56 ms delay. Maximum recommended CDELAY is 1 µF.
Does LP2988IM-3.2/NOPB support remote sensing, and how is it implemented?
Yes, LP2988IM-3.2/NOPB supports remote sensing via the SENSE pin (Pin 5). Connect SENSE directly to the load side of the output trace to compensate for voltage drop across PCB copper. This maintains 3.2 V accuracy at the load point, critical for precision analog circuits located away from the regulator.
LP2988IM-3.2/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):
- 3.2V
- 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
LP2988IM-3.2/NOPB FAQ
1.How can I place an order for LP2988IM-3.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2988IM-3.2/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 LP2988IM-3.2/NOPB reliable?
The price and inventory of LP2988IM-3.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2988IM-3.2/NOPB is usually 5 days.
3.What payment methods are accepted for LP2988IM-3.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2988IM-3.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2988IM-3.2/NOPB?
LP2988IM-3.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2988IM-3.2/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 LP2988IM-3.2/NOPB?
For technical support, including LP2988IM-3.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2988IM-3.2/NOPB requirements.
6.How does Aetrix verify that LP2988IM-3.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2988IM-3.2/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 LP2988IM-3.2/NOPB meets industry standards.
7.What is the process for return or replacement of LP2988IM-3.2/NOPB?
All LP2988IM-3.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2988IM-3.2/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 LP2988IM-3.2/NOPB part is unused and in its original packaging.
Return procedure for LP2988IM-3.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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