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Texas Instruments LP3988IMFX-2.85/NOPB
- Part No.:
- LP3988IMFX-2.85/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP3988IMFX-2.85/NOPB.pdf
- Description:
- IC REG LIN 2.85V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,883
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Product details
Overview
LP3988IMFX-2.85/NOPB from Texas Instruments is a micropower, ultra-low-dropout CMOS voltage regulator delivering 150 mA at fixed 2.85 V output with Power Good (PG) flag, 80 mV typical dropout at full load, ≤1 µA shutdown quiescent current, and operation from 2.5 V to 6 V input. It targets battery-powered wireless handsets requiring stable low-noise supply and fault monitoring.
For engineers reviewing the LP3988IMFX-2.85/NOPB datasheet, LP3988IMFX-2.85/NOPB pinout, LP3988IMFX-2.85/NOPB application, or LP3988IMFX-2.85/NOPB equivalent, key selection criteria include guaranteed 2.85 V ±3% output tolerance over −40°C to +125°C, open-drain PG response time of 10 µs, fast 100 µs turnon, and compatibility with 1-µF ceramic output capacitors in space-constrained portable designs.
Technical Context
The LP3988IMFX-2.85/NOPB integrates a PMOS pass transistor with internal reference and error amplifier, enabling ultra-low dropout and minimal ground current increase in dropout mode. Its enable logic accepts 1.2 V VIH and 0.5 V VIL thresholds, supporting direct connection to low-voltage microcontrollers.
Power Good functionality uses dual thresholds-93% VOUT high trip and 90% VOUT low trip-with 10 µs typical delay 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 2.85 V ±3% over −40°C to +125°C - ensures stable core logic supply for 2.8 V–3.0 V I/O domains |
| Max Output Current | 150 mA - sufficient for baseband processors, RF transceivers, and memory in compact handsets |
| Dropout Voltage | 80 mV typical at 150 mA - enables regulation down to VIN = 2.93 V, extending usable battery range |
| Quiescent Current | ≤1 µA in shutdown - minimizes leakage during sleep modes in always-on mobile devices |
| PSRR @ 10 kHz | 45 dB - suppresses switching noise from DC/DC converters feeding the LDO input |
| PG Response Time | 10 µs typical - provides rapid fault detection for system reset or brownout management |
| Input Voltage Range | 2.5 V to 6 V - supports single-cell Li-ion (2.7–4.2 V), Li-polymer, and dual-cell alkaline inputs |
Pinout & Package
SOT-23-5 package (2.90 mm × 1.60 mm), thermally enhanced with GND as primary heat path via lead 2. Compatible with standard reflow profiles and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 2.5–6 V; requires ≥1 µF ceramic capacitor placed ≤1 cm from pin to GND |
| OUT | Regulated output | Delivers 2.85 V ±3%; stable with 1–22 µF ceramic cap (5–500 mΩ ESR) |
| EN | Logic-enable input | Active-high; VIH = 1.2 V min, VIL = 0.5 V max - interfaces directly with 1.8 V or 3.3 V GPIO |
| PG | Open-drain Power Good flag | Pulled low when VOUT < 90% nominal; requires external pullup to ≤6 V rail |
| GND | Ground reference | Common return for IN, OUT, EN, PG; critical thermal path in SOT-23 layout |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 80 mV at 150 mA enables operation near battery end-of-discharge (e.g., 2.93 V input → 2.85 V output) |
| Power Good flag | 10 µs response with 3% hysteresis (90–93% VOUT) allows precise sequencing and fault isolation |
| Micropower shutdown | ≤1 µA IQ in disable mode extends standby time in cellular standby and deep-sleep states |
| Ceramic capacitor stability | Guaranteed stability with 1 µF X7R ceramic output cap - eliminates need for larger, costlier tantalum |
| Thermal protection | 160°C shutdown with 20°C hysteresis prevents damage during sustained overload or poor PCB thermal design |
Applications
| CDMA Handset Power Rail | GSM Baseband Core Supply |
|---|---|
Use Scenario: Supplies 2.85 V to CDMA transceiver ICs and analog front-end circuitry in slim handset form factors. IC Role / Device Role / Timing Role: Primary LDO for noise-sensitive RF sections; PG flag triggers RF power-down on undervoltage. Use Value: 45 dB PSRR at 10 kHz suppresses DC/DC ripple; 80 mV dropout preserves transmit time during battery sag. | Use Scenario: Powers ARM9-based baseband processor core in GSM handsets requiring tight 2.85 V ±3% tolerance. IC Role / Device Role / Timing Role: Main core regulator with EN controlled by PMIC; PG signals processor reset controller. Use Value: ≤1 µA shutdown IQ extends standby duration; 100 µs turnon meets fast wake-from-sleep timing budgets. |
| WCDMA RF Front-End Bias | Portable Media Player Audio Codec |
Use Scenario: Provides clean 2.85 V bias to WCDMA power amplifier driver stages and mixer LO buffers. IC Role / Device Role / Timing Role: Low-noise local supply; PG monitors rail integrity before PA enable assertion. Use Value: 220 µVRMS output noise avoids AM-to-PM distortion; 150 mA headroom supports burst-mode PA peaks. | Use Scenario: Powers stereo audio codec and flash memory interface in handheld media players. IC Role / Device Role / Timing Role: Secondary LDO for mixed-signal subsystem; EN synchronized with display backlight control. Use Value: Stable no-load regulation maintains codec bias during playback pause; 1 µF ceramic cap saves board area vs. tantalum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F12-DBVR | Fixed 1.2 V output; 200 mA rating; 120 mV dropout at 200 mA; no PG flag | Lacks Power Good monitoring; suited for digital core rails where fault signaling is handled externally | Select when 1.2 V output and higher current are required, and PG is unnecessary |
| TPS731285DBVR | 2.85 V output; 250 mA rating; 170 mV dropout at 250 mA; no PG flag; 30 µA quiescent current | Higher IQ and dropout; lacks PG but offers better transient response and higher current | Choose for higher load margin and improved line/load regulation where PG is omitted from system architecture |
Compared with TPL720F12-DBVR and TPS731285DBVR, the LP3988IMFX-2.85/NOPB uniquely combines 2.85 V output, ultra-low dropout (80 mV), micropower shutdown (≤1 µA), and integrated Power Good-making it optimal for battery-critical, fault-aware RF and baseband subsystems where all four attributes are simultaneously required.
Availability
LP3988IMFX-2.85/NOPB is available at Aetrix Electronics and suitable for CDMA/GSM/WCDMA handset power management, portable media player audio subsystems, and battery-backed real-time clock circuits requiring stable component supply and long-term lifecycle support.
Supply support for LP3988IMFX-2.85/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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer applications.
The LP3988 belongs to TI's micropower LDO family engineered specifically for portable battery-powered systems demanding ultra-low IQ, fast turnon, and reliable fault reporting via Power Good-targeting cellular handsets, wearables, and IoT edge nodes.
FAQ
What is the output voltage tolerance of the LP3988IMFX-2.85/NOPB across temperature and load?
The LP3988IMFX-2.85/NOPB delivers 2.85 V with ±3% tolerance over the full operating junction temperature range (−40°C to +125°C) and load range (0–150 mA). This specification is guaranteed per TI's SNVS161E datasheet Section 6.5, ensuring consistent performance in thermally demanding handset environments without external trimming.
Does the LP3988IMFX-2.85/NOPB require an external pullup resistor on the PG pin?
Yes, the LP3988IMFX-2.85/NOPB PG pin is an open-drain output and requires an external pullup resistor to a supply rail ≤6 V. Typical values range from 10 kΩ to 100 kΩ depending on rise time and bus loading requirements. The device does not integrate a pullup, and leaving PG floating or unconnected disables Power Good functionality.
Can the LP3988IMFX-2.85/NOPB operate with only a 1-µF output capacitor?
Yes, the LP3988IMFX-2.85/NOPB is explicitly designed and production-tested for stability with a single 1-µF ceramic output capacitor (X7R, Y5V, or Z5U dielectric). This is confirmed in Section 9.2.2.3 of the SNVS161E datasheet and eliminates the need for larger or higher-ESR alternatives in space-constrained layouts.
What is the maximum input voltage the LP3988IMFX-2.85/NOPB can tolerate?
The LP3988IMFX-2.85/NOPB has an absolute maximum input voltage rating of 6.5 V on the IN pin (Section 6.1), but its recommended operating maximum is 6 V. Exceeding 6 V risks permanent damage and violates the Absolute Maximum Ratings - design must ensure VIN stays within 2.5 V to 6 V under all conditions including transients.
How does the enable function behave when the EN pin is left unconnected?
The LP3988IMFX-2.85/NOPB EN pin has no internal pullup or pulldown. If left floating, the device state is undefined and may oscillate or remain disabled. TI recommends tying EN to IN for always-on operation or using an active GPIO with defined 0 V / 1.8 V levels - never leaving EN unconnected in production designs.
LP3988IMFX-2.85/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.85V
- 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-2.85/NOPB FAQ
1.How can I place an order for LP3988IMFX-2.85/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP3988IMFX-2.85/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-2.85/NOPB reliable?
The price and inventory of LP3988IMFX-2.85/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-2.85/NOPB is usually 5 days.
3.What payment methods are accepted for LP3988IMFX-2.85/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP3988IMFX-2.85/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP3988IMFX-2.85/NOPB?
LP3988IMFX-2.85/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP3988IMFX-2.85/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-2.85/NOPB?
For technical support, including LP3988IMFX-2.85/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP3988IMFX-2.85/NOPB requirements.
6.How does Aetrix verify that LP3988IMFX-2.85/NOPB is sourced from the original manufacturer or authorized distributors?
All LP3988IMFX-2.85/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-2.85/NOPB meets industry standards.
7.What is the process for return or replacement of LP3988IMFX-2.85/NOPB?
All LP3988IMFX-2.85/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP3988IMFX-2.85/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-2.85/NOPB part is unused and in its original packaging.
Return procedure for LP3988IMFX-2.85/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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