Monolithic Power Systems Inc. MP2492DN-LF-P

Overview

MP2492DN-LF-P from Monolithic Power Systems is a monolithic 100kHz step-down DC/DC converter with programmable output current limit, designed for automotive and industrial power supplies. It delivers up to 2A continuous output current across a 4.5V–55V input range, regulates output from 0.8V to 15V, features 0.25Ω internal MOSFET, and supports DCR or resistor-based current sensing - used in USB power adapters and linear charger supplies.

For engineers reviewing the MP2492DN-LF-P datasheet, MP2492DN-LF-P pinout, MP2492DN-LF-P application, or MP2492DN-LF-P equivalent, key selection criteria include its wide-input voltage capability, fixed-frequency current-mode control, thermal shutdown, cycle-by-cycle overcurrent protection, and compatibility with low-ESR ceramic output capacitors.

Technical Context

The MP2492DN-LF-P implements peak-current-mode control with a fixed 100kHz oscillator and integrated error amplifier, ramp compensation, and current-sense amplifier. Its feedback reference is 0.8V ±2%, and current-limit threshold is 100mV between ISP and ISN pins.

It uses an internal bootstrap regulator to drive the high-side MOSFET gate, supports soft-start via external capacitor on SS pin, and provides open-drain PGOOD monitoring with 90% FB regulation threshold. Protection includes under-voltage lockout (3.3V typ, 200mV hysteresis) and thermal shutdown at 150°C.

Key Specifications

Pinout & Package

MP2492DN-LF-P is packaged in SOIC8E (exposed pad), with thermal pad electrically connected to GND. The exposed pad must be soldered to a PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2491DN-LF-Z and LM5164QDGSRQ1, MP2492DN-LF-P uniquely balances 2A capability, SOIC8E simplicity, and cost-effective integration for non-automotive industrial and consumer power rails where 55V input and programmable current limit are critical.

Availability

MP2492DN-LF-P is available at Aetrix Electronics and suitable for automotive cigarette lighter adapters, USB power supplies, and industrial 24V-to-5V conversion requiring stable component supply and RoHS-compliant packaging.

Supply support for MP2492DN-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, headquartered in California and serving global industrial, automotive, and consumer markets.

The MP2492 belongs to MPS's high-voltage buck converter product line, engineered for robustness in automotive and industrial environments where wide input range, current limiting, and thermal resilience are essential.

FAQ

What is the maximum allowable input voltage for MP2492DN-LF-P?

The absolute maximum input voltage is 60V, but the recommended operating range is 4.5V to 55V. Operation at 55V is supported continuously and handles automotive load-dump transients per ISO 7637-2. Exceeding 60V risks permanent damage to the internal MOSFET and gate driver circuitry.

Can MP2492DN-LF-P operate with only ceramic output capacitors?

Yes - it is specifically designed for stability with low-ESR ceramic capacitors. The control loop compensates for ceramic cap characteristics, eliminating the need for aluminum or tantalum electrolytics. Typical designs use X5R/X7R 10µF–47µF output caps with ≤10mΩ ESR.

How is the output current limit programmed using DCR sensing?

Using the ISP and ISN pins, the current limit is set by scaling the inductor's DCR value with external resistors Ra and Rb so that V_ISP–V_ISN = 100mV at the desired current. Equation: I_LIM = 100mV / (DCR × R_b / (R_a + R_b)). Layout must minimize noise pickup on these high-impedance nodes.

Does MP2492DN-LF-P support synchronous rectification?

No - it uses an internal N-channel MOSFET for the high-side switch and requires an external Schottky diode (D1) for low-side conduction during the off-time. Synchronous operation is not supported; the SW pin drives only the high-side switch.

What is the purpose of the SS pin, and how is it configured?

The SS pin sets soft-start duration and provides compensation for the current-limit loop. A capacitor from SS to GND determines ramp time (e.g., 10nF ≈ 1ms start-up). It also connects to the error amplifier output during current limiting to clamp output voltage and enforce constant-current mode.

Is the exposed pad on MP2492DN-LF-P electrically connected?

Yes - the exposed pad is internally connected to GND and must be soldered to a PCB ground plane. It serves dual roles: thermal dissipation (reducing θ_JA by ~30%) and low-impedance ground reference for switching currents. Floating or unconnected pads cause thermal runaway and regulation instability.