Monolithic Power Systems Inc. MP24971DS-LF-P

Overview

MP24971DS-LF-P from Monolithic Power Systems is a monolithic 5V fixed-output, 1.5A continuous step-down DC/DC converter with programmable current limit and output line-drop compensation. It operates across an 8V–50V input range, features a 100kHz fixed switching frequency, integrates a 0.4Ω internal power MOSFET, and delivers stable regulation for USB power supplies and automotive adapters.

For engineers reviewing the MP24971DS-LF-P datasheet, MP24971DS-LF-P pinout, MP24971DS-LF-P application, or MP24971DS-LF-P equivalent, key selection criteria include its 5V fixed output, 1.5A load capability, 100kHz switching frequency, integrated current-sense inputs (ISP/ISN), and VOC-based line-drop compensation for remote load regulation.

Technical Context

The MP24971DS-LF-P implements a current-mode buck architecture with internal PWM comparator, error amplifier referenced to 0.8V, and ramp compensation. Its control loop senses peak inductor current via ISP/ISN differential inputs and regulates VOUT by adjusting duty cycle based on VOS feedback.

It integrates hiccup-mode current limiting triggered at 100mV sense voltage, 6V output over-voltage protection activated via ISN, and programmable line-drop compensation using VOC pin biasing and external RC network-enabling precise load-side voltage maintenance despite trace resistance.

Key Specifications

Pinout & Package

MP24971DS-LF-P is housed in an SOIC8 package (3.9mm × 4.9mm, 1.27mm pitch) with exposed pad for enhanced thermal dissipation. The package complies with JEDEC MS-012 variation AA and supports lead-free RoHS-compliant assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output buck converter applications.

Compared with MP24971DS-LF-P, MP24943DJ-LF-Z offers higher current and frequency but sacrifices line-drop compensation; LM5164QDDARQ1 adds AEC-Q100 compliance and frequency flexibility but increases component count and layout sensitivity.

Availability

MP24971DS-LF-P is available at Aetrix Electronics and suitable for USB power supplies, automotive power adapters, and linear charger power rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP24971DS-LF-P 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers in the US, China, and Taiwan.

The MP24971 belongs to MPS's industrial-grade buck converter product line, engineered for robust operation in automotive, transportation, and industrial power systems where wide input range and fault resilience are critical.

FAQ

What is the maximum recommended input voltage for MP24971DS-LF-P?

The absolute maximum input voltage is 60V, but the recommended operating range is 8V to 50V. Operation above 50V risks exceeding internal voltage ratings of BST, SW, and VIN pins-even briefly during transients-and may trigger overvoltage shutdown or degrade long-term reliability. Designers should implement clamping or filtering for automotive load-dump events.

Can MP24971DS-LF-P operate without an external sense resistor?

Yes-MP24971DS-LF-P supports both RSENSE-based and inductor DCR-based current sensing. With ISP and ISN tied directly to output and ground respectively, it uses the 100mV threshold to set ~1.5A limit assuming typical DCR. However, RSENSE (e.g., 66mΩ) is recommended for tighter current-limit accuracy and programmability, especially under temperature variation.

How does the VOC pin enable output line-drop compensation?

VOC accepts a resistor to GND that sets gain for load-line compensation. When load current flows through trace resistance, the resulting voltage drop is sensed differentially at ISP/ISN; the VOC network injects a proportional correction into the error amplifier, raising VOS reference to increase VOUT and cancel the drop-maintaining constant voltage at the remote load point.

Is MP24971DS-LF-P thermally capable of 1.5A continuous output in SOIC8?

No-SOIC8 (MP24971DS) has θJA = 90°C/W and max PD = 1.38W, limiting practical 1.5A operation to low VIN or forced-air cooling. MP24971DS-LF-P is the SOIC8E variant (exposed pad), with θJA = 50°C/W and PD = 2.5W, enabling full 1.5A at TA = 85°C with proper PCB copper area and thermal vias.

Does MP24971DS-LF-P require an external bootstrap diode?

An external bootstrap diode (e.g., BAT54) is optional but recommended when duty cycle exceeds 65%-such as at low VIN (e.g., 8V → 5V) or high ambient temperature-to ensure reliable BST capacitor recharge and prevent high-side MOSFET dropout. The internal bootstrap regulator suffices for most 12V–24V input cases.

What protection features are integrated in MP24971DS-LF-P?

MP24971DS-LF-P integrates hiccup-mode current limiting, output over-voltage protection (6V clamp), thermal shutdown (150°C), and short-circuit protection. It also includes under-voltage lockout (2.8–4.2V threshold) and soft-start (2–4ms) to prevent inrush. No external components are required to activate these protections.

Can MP24971DS-LF-P be used with ceramic output capacitors only?

Yes-the MP24971DS-LF-P is explicitly characterized and stabilized with low-ESR ceramic capacitors (X5R/X7R). Typical designs use 22µF + 100µF ceramics at the output. Electrolytics are unnecessary, reducing size, improving lifetime, and eliminating ESR-related loop instability concerns.