Monolithic Power Systems Inc. MP2307DN-LF

Overview

MP2307DN-LF 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. It employs current-mode control for fast transient response and includes cycle-by-cycle overcurrent protection, thermal shutdown at 160°C, and <1µA shutdown supply current - deployed in FPGA/DSP power supplies and notebook computers.

For engineers reviewing the MP2307DN-LF datasheet, MP2307DN-LF pinout, MP2307DN-LF application, or MP2307DN-LF equivalent, this page delivers verified functional identity, validated SOIC8N (exposed pad) package mapping, confirmed 8-pin terminal roles, real-world efficiency curves (up to 95% at 3A), and design-critical soft-start timing (15ms with 0.1µF capacitor).

Technical Context

The MP2307DN-LF implements current-mode control with an internal transconductance error amplifier (GEA = 820µA/V) and COMP pin-based loop compensation. Its oscillator operates at 340kHz (typ.) with short-circuit fallback to 110kHz, enabling stable regulation under dynamic load steps while maintaining phase margin via external RC network on COMP.

It integrates bootstrap gate drive circuitry requiring a SW-to-BS capacitor (≥0.01µF) to sustain high-side MOSFET conduction; feedback is referenced to a precise 0.925V threshold at FB, with EN pin providing logic-level enable/disable control and SS pin supporting programmable soft-start via external capacitor.

Key Specifications

Pinout & Package

MP2307DN-LF is housed in an 8-pin SOIC package with exposed thermal pad (SOIC8N), optimized for thermal dissipation (θJA = 50°C/W, θJC = 10°C/W) and compatible with standard reflow profiles. The exposed pad must be soldered to PCB ground plane for reliable operation at full 3A load.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2307DN-LF, MP2393DJ-LF-Z offers higher current and integration in a smaller package but requires layout revision; LM2678SD-3.3/NOPB trades efficiency and component count for lower unit cost, demanding careful thermal validation at full load.

Availability

MP2307DN-LF is available at Aetrix Electronics and suitable for FPGA power supplies, notebook system rails, distributed telecom power, and green appliance control boards requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MP2307DN-LF 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 Kirkland, Washington, with global design and support operations.

The MP2307 belongs to MPS's mainstream synchronous buck converter product line, designed specifically for cost-sensitive, space-constrained industrial and computing applications requiring integrated power stages and robust protection features.

FAQ

What is the minimum recommended output capacitor for stable operation?

The MP2307DN-LF is stable with low-ESR ceramic capacitors as small as 2×10µF (X5R/X7R), per typical application circuit. Using less than 20µF total capacitance may reduce phase margin and cause ringing under transient loads; 2×22µF is recommended for 3.3V/3A operation to maintain <20mV ripple and ensure 60° phase margin.

Can the MP2307DN-LF operate with a 3.3V input?

No. The absolute minimum input voltage is 4.75V, and the input UVLO threshold is 4.05V (rising). Operation below 4.75V violates recommended conditions and risks unregulated output or latch-up; for 3.3V input applications, consider the MP2108 or MP2143 families instead.

Is an external Schottky diode required for basic operation?

No. The MP2307DN-LF uses synchronous rectification with integrated low-side MOSFET, eliminating the need for an external diode. An optional Schottky (e.g., B130) may improve efficiency by ~1–2% at light loads when body diode conduction dominates, but it is not required for functionality or stability.

How is thermal performance affected by the exposed pad connection?

The exposed pad is electrically GND and thermally critical: unconnected or poorly soldered pads increase θJA by >20°C/W, causing junction temperatures to exceed 125°C at 3A/12V input. A minimum 25mm² copper pour connected via ≥4 thermal vias to inner ground planes is required for full-rated 3A operation at +85°C ambient.

What happens during startup if the SS pin is left floating?

Leaving SS unconnected disables soft-start, resulting in immediate full-duty-cycle startup. This causes high inrush current into output capacitance, potentially tripping input supply current limits or inducing output overshoot >10%; a 0.1µF capacitor to GND is strongly recommended to enforce controlled 15ms ramp.

Does the MP2307DN-LF support output voltages below 0.925V?

No. The internal feedback reference is fixed at 0.925V ±25mV; output voltage is set by VOUT = 0.925V × (1 + R1/R2). Configuring for <0.925V would require external amplification of the FB signal, which is unsupported and invalidates regulation accuracy and protection thresholds.

Is the MP2307DN-LF pin-compatible with other MPS buck regulators?

No. While MP2307DN-LF shares the SOIC8N package with some MPS parts (e.g., MP1584EN), pin functions differ significantly - e.g., MP1584EN uses Pin 1 as GND, whereas MP2307DN-LF uses Pin 1 as BS. Direct replacement requires full schematic and layout revision.