Monolithic Power Systems Inc. MP2307DN-LF-P

Overview

MP2307DN-LF-P from Monolithic Power Systems is a monolithic synchronous buck regulator integrating 100mΩ high- and low-side N-channel MOSFETs, delivering 3A continuous output current across a 4.75V–23V input range, with fixed 340kHz switching frequency and adjustable 0.925V–20V output voltage - used in FPGA/DSP power supplies and notebook DC-DC conversion.

For engineers reviewing the MP2307DN-LF-P datasheet, MP2307DN-LF-P pinout, MP2307DN-LF-P application, or MP2307DN-LF-P equivalent, key selection criteria include its thermally enhanced SOIC8N package with exposed pad, cycle-by-cycle overcurrent protection, programmable soft-start (15ms with 0.1µF), and compatibility with low-ESR ceramic output capacitors.

Technical Context

The MP2307DN-LF-P employs current-mode control architecture with internal transconductance error amplifier (GEA = 820µA/V) and COMP-based loop compensation, enabling fast transient response and stable regulation across wide load and input conditions. Its functional block includes integrated 5V internal regulator, UVLO (4.05V threshold), thermal shutdown (160°C), and OVP comparator tripped at 1.1V on FB.

Operation relies on external bootstrap capacitor between SW and BS to drive the high-side MOSFET gate above VIN; feedback is sensed at FB with 0.925V reference, while EN enables/disables the converter with 1.5V typical threshold and 220mV hysteresis. The device supports short-circuit protection via reduced-frequency foldback (110kHz).

Key Specifications

Pinout & Package

MP2307DN-LF-P is housed in an 8-pin SOIC package with exposed thermal pad (SOIC8N), optimized for PCB heat dissipation (θ_JA = 50°C/W, θ_JC = 10°C/W). The exposed pad must be soldered to a large copper area connected to Pin 4 (GND) for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2307DN-LF-P, MP2393DJ-LF-Z offers higher current and density but demands revised thermal and loop design, while LM2678SD-3.3/NOPB trades integration and efficiency for legacy compatibility and lower unit cost.

Availability

MP2307DN-LF-P is available at Aetrix Electronics and suitable for FPGA power supplies, notebook system rails, and distributed telecom power requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2307DN-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 mixed-signal ICs for power management, motion control, and automotive applications.

The MP2307 belongs to MPS's mainstream synchronous buck regulator product line, designed for cost-sensitive yet performance-demanding applications in computing, networking, and consumer electronics where integration, thermal robustness, and ease of use are critical.

FAQ

What is the maximum recommended output voltage for MP2307DN-LF-P?

The MP2307DN-LF-P supports output voltages up to 20V, set by the feedback resistor divider ratio and limited by the 0.925V internal reference. This allows direct generation of standard rails like 3.3V, 5V, and 12V, but operation above 15V requires careful attention to voltage stress on external components and PCB creepage.

Can MP2307DN-LF-P operate with only ceramic capacitors on input and output?

Yes - the MP2307DN-LF-P is explicitly designed for stability with low-ESR ceramic capacitors on both input and output. Recommended input capacitance is ≥2×10µF X5R/X7R ceramics, and output capacitance ≥2×22µF ceramics; no electrolytic or tantalum capacitors are required for basic operation.

Is the exposed pad on the SOIC8N package electrically connected?

Yes - the exposed pad is internally connected to Pin 4 (GND) and must be soldered to a dedicated GND copper pour on the PCB. This connection is essential for both thermal performance (reducing θ_JA by ~20°C/W) and electrical noise immunity; floating or unconnected pads cause thermal runaway and instability.

Does MP2307DN-LF-P require an external bootstrap diode?

An external bootstrap diode (e.g., IN4148) is optional and recommended only when V_OUT = 3.3V or 5V and duty cycle exceeds 65% (i.e., V_IN < 1.5×V_OUT). It improves high-side gate drive efficiency by reducing bootstrap capacitor discharge, but is not required for standard 12V→3.3V operation.

What happens during thermal shutdown?

When junction temperature reaches 160°C, the MP2307DN-LF-P disables switching and holds the high-side MOSFET off until temperature falls below ~145°C (15°C hysteresis). During shutdown, quiescent current drops to <3µA, and the device resumes normal operation automatically without external reset.

How is the soft-start time calculated for custom capacitor values?

Soft-start time scales linearly with SS-to-GND capacitance: t_SS ≈ 150 × C_SS (in µF) milliseconds. For example, a 0.047µF capacitor yields ~7ms soft-start. Leaving SS open disables soft-start entirely, resulting in immediate output ramp-up and potential inrush current.

Why does the datasheet state "NOT RECOMMENDED FOR NEW DESIGNS"?

This notice indicates MP2307DN-LF-P has been superseded by newer-generation regulators like MP2393, which offer higher current, better efficiency, smaller packages, and extended features. However, MP2307DN-LF-P remains fully qualified, in active production, and supported for existing designs and legacy BOMs.