Monolithic Power Systems Inc. MP2307DN-LF-Z

Overview

MP2307DN-LF-Z 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 - deployed in FPGA/DSP power supplies, notebook computers, and green electronics.

For engineers reviewing the MP2307DN-LF-Z datasheet, MP2307DN-LF-Z pinout, MP2307DN-LF-Z application, or MP2307DN-LF-Z equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world design constraints including soft-start timing, UVLO thresholds, and SOIC8N exposed-pad thermal performance.

Technical Context

The MP2307DN-LF-Z uses current-mode control architecture with internal transconductance error amplifier (820µA/V), cycle-by-cycle overcurrent protection, and integrated 5V internal rail for high-side gate drive via bootstrap capacitor between SW and BS pins. Its functional block includes dedicated OVP comparator (trip at 1.1V on FB), shutdown comparator (1.5V EN threshold), and dual-frequency oscillator (340kHz normal / 110kHz short-circuit mode).

It implements programmable soft-start via external capacitor on SS pin (15ms with 0.1µF), input under-voltage lockout (4.05V nominal, 210mV hysteresis), and thermal shutdown at 160°C. The COMP pin enables loop compensation using series RC network to stabilize regulation against load transients and LC filter variations.

Key Specifications

Pinout & Package

MP2307DN-LF-Z 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) and rated for –40°C to +85°C ambient operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down regulator applications.

Compared with MP2307DN-LF-Z, MP2393DJ-LF-Z offers higher current and frequency in a smaller footprint but sacrifices SOIC thermal reliability, while LM2678SD-3.3/NOPB trades integration for flexibility - making MP2307DN-LF-Z optimal for cost-sensitive, thermally demanding 3A designs needing adjustable output and minimal external parts.

Availability

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

Supply support for MP2307DN-LF-Z 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, computing, and automotive markets since 1997.

The MP2307 belongs to MPS's mainstream synchronous buck regulator product line, designed specifically for cost-effective, high-efficiency DC-DC conversion in space- and thermal-constrained embedded systems where integration, reliability, and ease of use are prioritized.

FAQ

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

The MP2307DN-LF-Z supports output voltages up to 20V, set by the feedback resistor divider ratio with a 0.925V reference. This upper limit is constrained by internal voltage ratings and stability margins - exceeding 20V risks violating the absolute maximum rating on the FB pin and may cause regulation instability or premature shutdown.

Can MP2307DN-LF-Z operate with a 3.3V input supply?

No - MP2307DN-LF-Z has a minimum input voltage of 4.75V per its absolute maximum ratings and operating conditions. At 3.3V input, the device will not start or sustain regulation due to internal UVLO activation (trip point 4.05V, ±210mV hysteresis), and attempting operation risks undefined behavior or latch-up.

Is an external Schottky diode required for basic operation?

No - MP2307DN-LF-Z operates fully synchronously using internal MOSFETs and does not require an external Schottky diode. However, adding one (e.g., B130) from SW to GND can improve efficiency by ~1–2% under light loads by bypassing the low-side MOSFET body diode conduction loss.

How is thermal performance affected by the exposed pad connection?

The exposed pad on the SOIC8N package must be soldered to a large PCB copper area to achieve the specified θ_JA = 50°C/W. Leaving it unconnected raises junction temperature by >40°C at 2W dissipation, risking thermal shutdown at ambient >65°C - proper pad grounding is mandatory for full 3A continuous operation.

What happens during a short-circuit event on the output?

Under output short-circuit, MP2307DN-LF-Z enters hiccup mode: the oscillator frequency drops from 340kHz to 110kHz, limiting average current and preventing thermal runaway. The device cycles on/off until fault clears, with automatic recovery - no latch-off or manual reset required.

Does MP2307DN-LF-Z support forced PWM or skip-mode operation?

MP2307DN-LF-Z operates exclusively in forced continuous conduction mode (CCM) using current-mode control - it does not include pulse-skipping or burst-mode functionality. This ensures constant switching frequency and predictable EMI, but results in higher light-load quiescent current versus adaptive-mode regulators.

Why is a capacitor required between SW and BS pins?

The SW-to-BS capacitor (≥0.01µF) forms a charge pump that generates a voltage above VIN to drive the high-side N-MOSFET gate. Without it, the high-side switch cannot turn on fully, causing excessive conduction loss, thermal stress, and potential failure - this capacitor is non-optional and must be placed adjacent to the IC.