Monolithic Power Systems Inc. MP2107ADN-LF-Z

Overview

MP2107ADN-LF-Z from Monolithic Power Systems is a 4A, 6V synchronous step-down switching regulator in an 8-pin SOIC-EP package with exposed pad. It operates from 2.7V–6V input, delivers adjustable output down to 0.8V, integrates 80mΩ high-side and 60mΩ low-side MOSFETs, and features 1.5MHz fixed-frequency PWM control with peak current mode for compact point-of-load power delivery in FPGA I/O rails.

For engineers reviewing the MP2107ADN-LF-Z datasheet, MP2107ADN-LF-Z pinout, MP2107ADN-LF-Z application, or MP2107ADN-LF-Z equivalent, this device supports design of high-efficiency, space-constrained DC/DC converters requiring ±10% power-good monitoring, frequency synchronization (1–2MHz), internal soft-start (120µs), hiccup short-circuit protection, and thermal shutdown at 150°C.

Technical Context

The MP2107ADN-LF-Z implements constant-frequency peak-current-mode control with integrated Type II compensation, eliminating external loop compensation components. Its transconductance error amplifier delivers 11.25A/V gain from COMP voltage to output current, enabling stable regulation across load transients up to 4A.

It uses dual-function EN/SYNC pin for enable control (1.6V turn-on, 0.4V shutdown) and external clock synchronization (1–2MHz), while the open-drain POK pin asserts low when VOUT deviates >±10% from nominal, with 30µs deglitch timing. Bootstrap operation (BS–SW capacitor) sustains high-side gate drive during continuous conduction.

Key Specifications

Pinout & Package

MP2107ADN-LF-Z uses an 8-pin SOIC package with exposed thermal pad (SOIC8E), requiring solder connection of the pad to PCB ground plane for thermal performance (θJC = 10°C/W). Pin functions are validated per Monolithic Power Systems Rev. 1.1 datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2107ADN-LF-Z, MP2108ADN-LF-Z offers higher current headroom at cost of reduced input voltage range, while TPS54331DR trades integration for input voltage flexibility-neither matches the 4A/6V/POK/sync combination in a thermally optimized SOIC8E package.

Availability

MP2107ADN-LF-Z is available at Aetrix Electronics and suitable for FPGA power delivery, ASIC core supplies, and network equipment point-of-load regulation requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term sourcing.

Supply support for MP2107ADN-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, with design centers in the US, China, and Taiwan.

The MP2107A product line targets compact, high-efficiency DC/DC conversion for portable and space-constrained electronics, emphasizing integration, thermal robustness, and ease of layout in SOIC and QFN packages.

FAQ

What is the maximum recommended input voltage for MP2107ADN-LF-Z?

The absolute maximum input voltage is +6.5V, but the recommended operating range is 2.7V to 6V. Operation above 6V risks permanent damage to the internal 80mΩ high-side MOSFET and bootstrap circuitry. For 6V nominal systems, ensure transient spikes remain below 6.5V using input clamping or filtering.

Does MP2107ADN-LF-Z require an external Schottky diode?

No-MP2107ADN-LF-Z integrates synchronous rectification with a 60mΩ low-side MOSFET, eliminating the need for an external Schottky diode. However, MPS recommends adding one (e.g., B0530) when output current exceeds 2A to reduce SW node voltage spikes and improve efficiency by ~0.5%.

How is the output voltage set on MP2107ADN-LF-Z?

Output voltage is set using an external resistor divider from VOUT to GND, with the FB pin connected to the divider midpoint. The internal 0.800V reference determines VOUT = 0.8 × (1 + R1/R2). For example, 1.8V output uses R1 = 400kΩ and R2 = 316kΩ per MPS Table 1.

What thermal considerations apply to the SOIC8E package?

The SOIC8E package has θJA = 50°C/W and θJC = 10°C/W. To sustain 4A at 6V input, the exposed pad must be soldered to ≥2 cm² of inner-layer ground copper. Without proper thermal vias and pad connection, junction temperature may exceed 125°C even at 25°C ambient.

Can MP2107ADN-LF-Z synchronize to an external clock?

Yes-the EN/SYNC pin accepts 1MHz to 2MHz square-wave clocks. When an external clock is applied, the internal oscillator locks to it within three cycles. Clock duty cycle is not critical, but any ON or OFF period longer than 4µs is interpreted as an enable command instead of sync.

What happens during output pre-bias startup?

If the output is pre-biased above the target voltage before enable, MP2107ADN-LF-Z disables both high- and low-side switches until the internal soft-start capacitor voltage exceeds the FB pin voltage. This prevents reverse current flow and potential damage to upstream sources or downstream loads.

Is the POK signal active-high or active-low?

POK is an open-drain output that is active-low: it pulls to GND when VOUT is outside ±10% of nominal, and floats (requiring external pull-up) when VOUT is within regulation. The 30µs deglitch timer prevents false triggering during brief load transients.