Monolithic Power Systems Inc. MP2106DK-LF-Z

Overview

MP2106DK-LF-Z from Monolithic Power Systems is a 1.5A, 800kHz synchronous buck converter in MSOP-10 package, designed for low-voltage DC/DC regulation with input range 2.6V–15V and output as low as 0.9V. It integrates 210mΩ (low-side) and 255mΩ (high-side) N-MOSFETs, supports zero-current shutdown mode, and delivers >90% efficiency at 1.5A load under 5V input.

For engineers reviewing the MP2106DK-LF-Z datasheet, MP2106DK-LF-Z pinout, MP2106DK-LF-Z application, or MP2106DK-LF-Z equivalent, this page provides verified functional identity, validated pin roles, confirmed thermal and electrical specs, and real-world use cases in portable power systems requiring compact, high-efficiency step-down conversion.

Technical Context

The MP2106DK-LF-Z implements current-mode control with internal transconductance error amplifier (300µA/V), 800kHz fixed-frequency PWM, and cycle-by-cycle overcurrent protection. Its architecture includes integrated high- and low-side N-channel MOSFETs, internal 2.4V LDO regulator (bypassed via VREF pin), and soft-start circuitry driven by 2µA current source into external SS capacitor.

It features under-voltage lockout (2.2V threshold with 100mV hysteresis), thermal shutdown at 160°C, and bootstrap gate drive for high-side switch using BST–LX capacitor. The device operates across –40°C to +85°C ambient and supports duty cycles up to 85% for VIN ≥ 3.3V.

Key Specifications

Pinout & Package

MP2106DK-LF-Z uses a 10-pin MSOP package (3.0mm × 4.9mm, 0.5mm pitch) with exposed pad for thermal enhancement. Pin 1 is marked by half-circle indentation per JEDEC MO-817 BA variation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2106DK-LF-Z, MP2108DK-LF-Z offers higher current headroom at marginally increased quiescent draw, while TPS561201DRCT trades integration for broader input range and vendor-specific design support-neither is pin-compatible, and both require layout and compensation revalidation.

Availability

MP2106DK-LF-Z is available at Aetrix Electronics and suitable for portable entertainment systems, digital video cameras, wireless modems, and networking equipment requiring stable component supply, lead-free compliance, and long-term industrial availability.

Supply support for MP2106DK-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 consumer markets since 1997.

The MP2106 belongs to MPS's mainstream synchronous buck converter product line, engineered for space-constrained, battery-sensitive applications where integration, efficiency, and thermal robustness outweigh programmability or multi-rail flexibility.

FAQ

What is the minimum recommended input voltage for reliable startup?

The MP2106DK-LF-Z has an under-voltage lockout threshold of 2.2V with 100mV hysteresis, meaning it will not start switching until VIN rises above 2.2V and remains stable. For guaranteed startup under load, apply ≥2.6V as specified in the absolute maximum ratings-below this, regulation accuracy and current limit behavior are not characterized.

Can the MP2106DK-LF-Z operate with a 3.3V input and 1.2V output?

Yes. With VIN=3.3V and VOUT=1.2V, the duty cycle is ~36%, well within the 85% maximum. The device maintains >87% efficiency at 1.5A under these conditions, and the 0.895V feedback reference ensures accurate regulation using standard resistor values (e.g., R1=10kΩ, R2=3.4kΩ).

Is an external bootstrap diode required for optimal efficiency?

An external BST diode (e.g., IN4148) is recommended only when VOUT ≥ 3.3V and duty cycle exceeds 65% (i.e., VIN ≤ 5V). For MP2106DK-LF-Z operating at 1.8V/5V, the internal bootstrap circuit suffices; adding the diode improves efficiency by ~1.2% but adds cost and board area.

How does the soft-start function interact with the RUN pin?

Soft-start initiates only after RUN is pulled high (>1.5V). If RUN toggles during startup, the SS capacitor discharges through internal clamp circuitry, resetting soft-start. This ensures controlled ramp-up each time the device is enabled, preventing repeated inrush events in systems with intermittent enable signals.

What is the maximum allowable output capacitance without compromising stability?

No hard upper limit exists, but stability depends on ESR and capacitance value. For ceramic outputs, up to 100µF is acceptable if compensated per Table 1 (e.g., R3=6.8kΩ, C3=3.3nF for 1.8V/22µF). Exceeding 47µF tantalum requires adding C4 (e.g., 1nF) to counteract ESR zero placement.

Does the MP2106DK-LF-Z support forced PWM or power-save mode selection?

No. The MP2106DK-LF-Z operates exclusively in forced continuous conduction mode (CCM) at 800kHz and does not include pulse-skipping or auto-skip functionality. At light loads, it maintains switching frequency but reduces duty cycle-efficiency drops to ~75% at 10mA due to fixed gate drive losses.

What thermal derating applies above 85°C ambient?

Rated for operation up to +85°C ambient. Above this, derating follows θJA = 150°C/W (MSOP-10): maximum power dissipation decreases linearly-e.g., at 100°C ambient, PDmax = (125°C − 100°C)/150 = 0.167W, limiting practical output current to ~0.8A with typical PCB copper area.