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Texas Instruments LP3988IMFX-3.0/NOPB
- Part No.:
- LP3988IMFX-3.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3988IMFX-3.0/NOPB.pdf
- Description:
- IC REG LINEAR 3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,861
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Product details
Overview
LP3988IMFX-3.0/NOPB from Texas Instruments is a micropower, ultra-low-dropout CMOS voltage regulator delivering 150 mA at fixed 3.0 V output with Power Good (PG) flag, 80 mV typical dropout at full load, ≤1 µA shutdown current, and operation from 2.5 V to 6 V input - designed for battery-powered mobile handsets and portable information appliances.
For engineers reviewing the LP3988IMFX-3.0/NOPB datasheet, LP3988IMFX-3.0/NOPB pinout, LP3988IMFX-3.0/NOPB application, or LP3988IMFX-3.0/NOPB equivalent, key selection considerations include its SOT-23-5 package, open-drain PG threshold accuracy (90–95% VOUT), fast 100 µs turnon time, PSRR of 45 dB at 10 kHz, and compatibility with 1-µF ceramic output capacitors.
Technical Context
The LP3988IMFX-3.0/NOPB integrates a PMOS pass transistor with internal reference and error amplifier to achieve ultra-low dropout and stable regulation across −40°C to +125°C. Its enable-controlled logic interface (VIH = 1.2 V, VIL = 0.5 V) supports direct microcontroller GPIO control without level shifting.
Power Good functionality uses dual thresholds (VTHL = 90–93%, VTHH = 92–98% VOUT) with 10 µs typical response time and open-drain output requiring external pullup. Thermal shutdown activates at ~160°C with 20°C hysteresis, and short-circuit protection limits output current to 600 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0 V ±3.5% over −40°C to +125°C - ensures stable supply for 3.3 V I/O-tolerant or 3.0 V core logic without external feedback. |
| Max Output Current | 150 mA continuous - sufficient for baseband processors, RF transceivers, or sensor subsystems in compact handheld devices. |
| Dropout Voltage | 80 mV typical at 150 mA - enables regulation down to VIN = 3.08 V, extending usable battery life in single-cell Li-ion or Li-poly systems. |
| Quiescent Current | ≤1 µA in shutdown - minimizes standby drain in always-on power domains such as real-time clocks or backup RAM. |
| PSRR @ 10 kHz | 45 dB - suppresses switching noise from DC/DC converters or digital ICs feeding the LDO input rail. |
| Power Good Threshold | 90–95% VOUT low threshold, 92–98% VOUT high threshold - provides reliable reset signaling for microcontrollers during brownout or startup. |
| Enable Logic | VIH = 1.2 V, VIL = 0.5 V - compatible with 1.8 V and 3.3 V GPIO without external biasing. |
Pinout & Package
LP3988IMFX-3.0/NOPB is packaged in a 5-pin SOT-23 (DBV) with body size 2.90 mm × 1.60 mm, optimized for space-constrained portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input voltage supply | Accepts 2.5 V to 6 V; requires ≥1 µF ceramic capacitor placed within 1 cm of pin for stability. |
| OUT (Pin 5) | Regulated output | Delivers fixed 3.0 V; stable with 1–22 µF ceramic capacitors (5–500 mΩ ESR). |
| GND (Pin 2) | Ground reference | Primary thermal path in SOT-23; must connect to internal ground plane via wide trace and thermal vias. |
| EN (Pin 3) | Logic enable input | Active-high control: ≥1.2 V enables regulator; ≤0.5 V disables it and reduces IQ to ≤1 µA. |
| PG (Pin 4) | Open-drain Power Good flag | Asserts low when VOUT < 90–93% nominal; requires external pullup to ≤6 V rail for system monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current in shutdown | ≤1 µA enables multi-year battery life in maintenance-free IoT sensors and backup power circuits. |
| Stability with 1-µF ceramic output capacitor | Eliminates need for larger, more expensive tantalum caps - reduces BOM cost and board area by >50% vs legacy LDOs. |
| Fast 100 µs turnon time | Supports dynamic power sequencing in multi-rail systems where regulated 3.0 V must ramp before processor core voltage. |
| Integrated thermal shutdown with hysteresis | 160°C trip / 140°C recovery prevents permanent damage during transient overload or poor PCB thermal design. |
| Accurate Power Good flag with dual thresholds | 2.6% hysteresis between PG ON/OFF thresholds avoids chatter during marginal VOUT conditions near regulation limit. |
Applications
| CDMA/GSM Handset Power Management | Portable Medical Sensor Node |
|---|---|
Use Scenario: Regulating battery voltage to supply baseband processor I/O and RF front-end bias rails in dual-mode cellular handsets. IC Role / Device Role / Timing Role: Primary 3.0 V LDO with Power Good signaling to coordinate processor boot sequence and RF power-up timing. Use Value: 80 mV dropout extends usable battery range from 3.3 V down to 3.08 V, while 45 dB PSRR at 10 kHz suppresses PA switching noise coupling into sensitive analog sections. | Use Scenario: Providing clean, low-noise 3.0 V supply to ADC, low-power MCU, and Bluetooth LE radio in wearable ECG patch. IC Role / Device Role / Timing Role: Always-on power domain regulator with EN controlled by MCU sleep/wake state; PG confirms valid supply before data acquisition. Use Value: ≤1 µA shutdown current enables >5-year shelf life on coin cell; 220 µVRMS output noise ensures sub-LSB ADC accuracy without additional filtering. |
| Industrial Handheld Terminal | Smart Meter Real-Time Clock Backup |
Use Scenario: Powering display driver, touch controller, and secure element in ruggedized barcode scanner operating across −25°C to +70°C ambient. IC Role / Device Role / Timing Role: Main 3.0 V supply with thermal shutdown protecting against enclosure overheating during extended scanning sessions. Use Value: −40°C to +125°C junction rating ensures reliability under sealed housing conditions; 600 mA short-circuit limit withstands accidental I/O shorts without latch-up. | Use Scenario: Maintaining RTC and SRAM voltage during main power failure using supercapacitor or backup battery. IC Role / Device Role / Timing Role: Low-quiescent, no-load-stable LDO ensuring continuous timekeeping with PG flag triggering backup switchover logic. Use Value: Stable regulation at zero load eliminates need for dummy load resistors; 10 µs PG response enables sub-millisecond failover detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCS2117-3.0 | Fixed 3.0 V, 200 mA output, 120 mV dropout, 2.5 µA quiescent current in shutdown | Larger dropout and higher IQ reduce battery runtime in ultra-low-power designs | Choose when higher output current headroom is required and 3.0 V tolerance is relaxed to ±4% |
| MCP1700T-3002E/MB | Fixed 3.0 V, 250 mA, 178 mV dropout, 1.6 µA shutdown IQ, SOT-23-3 package (no PG) | No Power Good output and higher dropout limit use in systems requiring precise reset signaling or deep battery discharge | Choose when PG is unnecessary and lowest BOM cost is prioritized over monitoring capability |
Compared with TCS2117-3.0 and MCP1700T-3002E/MB, LP3988IMFX-3.0/NOPB uniquely balances ultra-low dropout (80 mV), sub-µA shutdown, integrated PG flag, and 1-µF ceramic stability - making it optimal for space- and energy-constrained portable designs where supply integrity monitoring is critical.
Availability
LP3988IMFX-3.0/NOPB is available at Aetrix Electronics and suitable for CDMA/GSM handset power management, portable medical sensor nodes, industrial handheld terminals, smart meter RTC backup, and battery-powered wireless modules requiring stable component supply with guaranteed long-term sourcing.
Supply support for LP3988IMFX-3.0/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 delivering analog and embedded processing solutions, with over 90 years of innovation in power management, signal chain, and microcontrollers.
The LP3988IMFX-3.0/NOPB belongs to TI's micropower LDO family engineered specifically for portable battery-operated systems demanding ultra-low IQ, minimal board area, and reliable Power Good signaling - targeting mobile communications, wearables, and industrial handhelds.
FAQ
What is the maximum input voltage rating for LP3988IMFX-3.0/NOPB?
The absolute maximum input voltage on the IN pin of LP3988IMFX-3.0/NOPB is 6.5 V. However, the recommended operating range is 2.5 V to 6 V. Exceeding 6.5 V risks permanent damage per the Absolute Maximum Ratings table in the SNVS161E datasheet. For reliable long-term operation, maintain VIN ≤ 6 V and ensure proper decoupling with ≥1 µF ceramic capacitor close to the IN pin.
Does LP3988IMFX-3.0/NOPB require an external pullup resistor on the PG pin?
Yes, LP3988IMFX-3.0/NOPB requires an external pullup resistor on the PG pin because it features an open-drain output. The datasheet specifies that PG can be pulled up to any rail ≤6 V; a typical value is 100 kΩ to VOUT or VIN. Without this pullup, the PG signal remains undefined and cannot indicate VOUT OK or ERROR states reliably during system startup or fault conditions.
Can LP3988IMFX-3.0/NOPB operate with zero load current?
Yes, LP3988IMFX-3.0/NOPB remains stable and in regulation with no external load - a feature explicitly confirmed in Section 9.2.2.4 ("No-Load Stability") of the SNVS161E datasheet. This makes LP3988IMFX-3.0/NOPB suitable for applications like CMOS RAM keep-alive circuits or RTC backup supplies where continuous regulation at microamp-level loads is essential.
What is the thermal shutdown behavior of LP3988IMFX-3.0/NOPB?
LP3988IMFX-3.0/NOPB activates thermal shutdown at approximately 160°C junction temperature and recovers when cooled to ~140°C, providing 20°C hysteresis. During shutdown, the output is disabled and power dissipation drops to near zero. Cycling may occur under sustained overload; however, the datasheet cautions that continuous TSD operation degrades reliability - proper PCB thermal design (e.g., GND pad vias in SOT-23) is mandatory for LP3988IMFX-3.0/NOPB.
Is LP3988IMFX-3.0/NOPB compatible with ceramic output capacitors smaller than 1 µF?
No, LP3988IMFX-3.0/NOPB is not guaranteed stable with output capacitance below 1 µF. The datasheet specifies 1–22 µF ceramic capacitors (with 5–500 mΩ ESR) as the validated range. Using <1 µF violates the minimum stability requirement and may cause oscillation or poor transient response. X7R dielectric is recommended for temperature stability, especially across −40°C to +125°C operation.
LP3988IMFX-3.0/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):
- 6V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.15V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 120 µA
- Current - Supply (Max):
- 200 µA
- PSRR:
- 65dB ~ 45dB (1kHz ~ 10kHz)
- Control Features:
- Enable, Power Good
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LP3988IMFX-3.0/NOPB FAQ
1.How can I place an order for LP3988IMFX-3.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3988IMFX-3.0/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 LP3988IMFX-3.0/NOPB reliable?
The price and inventory of LP3988IMFX-3.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP3988IMFX-3.0/NOPB is usually 5 days.
3.What payment methods are accepted for LP3988IMFX-3.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3988IMFX-3.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3988IMFX-3.0/NOPB?
LP3988IMFX-3.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3988IMFX-3.0/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 LP3988IMFX-3.0/NOPB?
For technical support, including LP3988IMFX-3.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3988IMFX-3.0/NOPB requirements.
6.How does Aetrix verify that LP3988IMFX-3.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3988IMFX-3.0/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 LP3988IMFX-3.0/NOPB meets industry standards.
7.What is the process for return or replacement of LP3988IMFX-3.0/NOPB?
All LP3988IMFX-3.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3988IMFX-3.0/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 LP3988IMFX-3.0/NOPB part is unused and in its original packaging.
Return procedure for LP3988IMFX-3.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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