Texas Instruments LP3988IMF-3.0

Overview

LP3988IMF-3.0 from Texas Instruments is a micropower, ultra-low-dropout CMOS voltage regulator delivering 150 mA at fixed 3.0 V output with ±3% tolerance, 80 mV typical dropout at full load, and integrated open-drain Power Good (PG) flag. It operates from 2.5 V to 6 V input, draws ≤1 µA in shutdown, and targets space-constrained battery-powered RF subsystems such as GSM/CDMA handset baseband IC power rails.

For engineers reviewing the LP3988IMF-3.0 datasheet, LP3988IMF-3.0 pinout, LP3988IMF-3.0 application, or LP3988IMF-3.0 equivalent, key selection criteria include guaranteed 3.0 V output accuracy over −40°C to +125°C, fast 100 µs turnon time, PSRR of 45 dB at 10 kHz, and compatibility with 1-µF ceramic output capacitors in SOT-23-5 packaging.

Technical Context

The LP3988IMF-3.0 integrates a PMOS pass transistor with internal voltage reference, enable logic, and comparator-based Power Good monitoring. Its PG output asserts low when VOUT falls below 90–95% of nominal, with 10 µs typical response and no external delay components required.

It features thermal shutdown at ~160°C with 20°C hysteresis, fixed current limit of 600 mA, and operates in three functional modes: normal regulation, dropout (input < VOUT + VDO), and disabled (EN < 0.5 V). Line regulation is ±0.2%/V and load regulation is ±0.007%/mA across full temperature range.

Key Specifications

Pinout & Package

LP3988IMF-3.0 is packaged in a 5-pin SOT-23 (DBV) with body size 2.90 mm × 1.60 mm, optimized for high-density portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TCS2113-3.0 and MCP1703T-3002E/MB, the LP3988IMF-3.0 uniquely combines ultra-low dropout (80 mV), integrated PG, and sub-1-µA shutdown in SOT-23 - making it optimal for battery-critical, space-constrained RF and portable medical applications where rail validation and end-of-life runtime are design priorities.

Availability

LP3988IMF-3.0 is available at Aetrix Electronics and suitable for cellular handset power management, portable medical sensor nodes, and wearable BLE SoC core rail applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LP3988IMF-3.0 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.

The LP3988 product line delivers micropower, ultra-low-dropout LDOs with integrated Power Good for battery-powered portable electronics - designed specifically to maximize runtime, minimize board area, and simplify power sequencing in space- and energy-constrained systems.

FAQ

What is the output voltage tolerance of the LP3988IMF-3.0 over temperature?

The LP3988IMF-3.0 maintains a fixed 3.0 V output with ±3% tolerance across the full operating junction temperature range of −40°C to +125°C. This specification is guaranteed per TI's SNVS161E datasheet Section 6.5, ensuring consistent performance in automotive cabin or industrial edge environments where ambient temperatures fluctuate widely. The LP3988IMF-3.0 achieves this via precision internal voltage reference and trimming.

Does the LP3988IMF-3.0 require an external pullup resistor on the PG pin?

Yes, the LP3988IMF-3.0 PG pin is an open-drain output and requires an external pullup resistor to a valid supply rail (≤6 V, such as VIN or VOUT) to generate a logic-high signal when VOUT is in regulation. Typical values range from 10 kΩ to 100 kΩ. Without the pullup, the PG signal remains floating and cannot indicate "VOUT OK" status. This design enables flexible voltage-level interfacing in the LP3988IMF-3.0 application.

Can the LP3988IMF-3.0 operate with a 2.7-V input when regulating 3.0 V?

No - the LP3988IMF-3.0 cannot regulate 3.0 V from a 2.7-V input. Per Section 6.3 of the datasheet, minimum input voltage is the greater of 2.5 V or VOUT + 200 mV. For LP3988IMF-3.0 (VOUT = 3.0 V), minimum VIN = 3.2 V. At 2.7 V, the device enters dropout and output drops to ~2.62 V (3.0 V – 380 mV typical dropout at light load), making it unsuitable for that condition. Always verify VIN ≥ VOUT + VDO in LP3988IMF-3.0 designs.

What is the maximum allowable output capacitor ESR for stable operation of the LP3988IMF-3.0?

The LP3988IMF-3.0 is specified for stable operation with output capacitors having ESR between 5 mΩ and 500 mΩ, as stated in Section 6.5 of the datasheet. Using an ESR outside this range risks oscillation or degraded transient response. A typical 1-µF X7R ceramic capacitor (ESR ≈ 20–40 mΩ) meets this requirement and is recommended for minimal footprint and cost. Avoid high-ESR tantalum unless verified for stability in the LP3988IMF-3.0 application.

Is the LP3988IMF-3.0 RoHS-compliant and halogen-free?

Yes, the LP3988IMF-3.0 is RoHS-compliant and halogen-free per Texas Instruments' official packaging and environmental documentation. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 for the SOT-23 package and carries TI's standard green material designation. Full compliance data, including REACH and conflict minerals statements, is available in TI's Quality & Environmental section under part number LP3988IMF-3.0.