Monolithic Power Systems Inc. MP2106DK-LF

Overview

MP2106DK-LF 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) MOSFETs, delivers >90% efficiency at 1.8V/1.5A output, and features cycle-by-cycle current limiting, thermal shutdown, and soft-start for portable power rails.

For engineers reviewing the MP2106DK-LF datasheet, MP2106DK-LF pinout, MP2106DK-LF application, or MP2106DK-LF equivalent, this device supports compact, high-efficiency point-of-load conversion in space-constrained systems where input voltage stability, startup inrush control, and thermal robustness are critical selection criteria.

Technical Context

The MP2106DK-LF implements fixed-frequency current-mode control with an internal 800kHz oscillator, enabling precise duty-cycle modulation based on inductor current sensing and error amplifier output at COMP. Its integrated high- and low-side N-channel MOSFETs eliminate external switch losses and reduce BOM count.

It employs a 2µA soft-start current source charging the SS pin capacitor to linearly ramp FB reference voltage, preventing input inrush. The internal 2.4V VREF LDO powers internal circuitry and requires 10nF bypassing; BST bootstrapping enables high-side gate drive via a ≥10nF capacitor between BST and LX.

Key Specifications

Pinout & Package

MP2106DK-LF uses a lead-free, RoHS-compliant 10-pin MSOP package (3.0mm × 4.9mm × 1.0mm height) with exposed thermal pad on bottom side for enhanced heat dissipation (θ_JA = 150°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2106DK-LF, MP2108DK-LF offers headroom for future load growth without layout change, while TPS54202DRCT trades pin compatibility for broader input range and lower reference voltage-neither is drop-in replaceable without validation of loop stability and thermal performance.

Availability

MP2106DK-LF is available at Aetrix Electronics and suitable for portable entertainment systems, digital video cameras, networking equipment, and wireless modems requiring stable component supply across production lifecycles.

Supply support for MP2106DK-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 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 cost-sensitive, space-constrained applications demanding high efficiency, integrated power switches, and robust protection features in compact packages.

FAQ

What is the maximum recommended output current for MP2106DK-LF in continuous operation?

The MP2106DK-LF is rated for 1.5A continuous output current under specified thermal conditions (T_A ≤ +85°C, θ_JA = 150°C/W). Derating is required above +60°C ambient or with insufficient copper pour; peak current limit is 2.5A (source) and 350mA (sink), verified per electrical characteristics table.

Can MP2106DK-LF operate with a 2.5V input supply?

Yes-MP2106DK-LF supports input voltages from 2.6V to 15V, so 2.5V is below minimum operating voltage and will trigger under-voltage lockout (UVLO threshold = 2.2V with 100mV hysteresis). Stable operation requires VIN ≥ 2.6V; for 2.5V sources, a pre-regulator or alternative IC with lower VIN min is needed.

Is an external bootstrap diode required for MP2106DK-LF?

No-MP2106DK-LF uses internal charge-pump-assisted bootstrapping and does not require an external diode. However, an IN4148 diode from VOUT to BST is recommended when VOUT = 3.3V or 5V and duty cycle exceeds 65%, as stated in Application Information section, to improve light-load efficiency.

How is the soft-start time calculated for MP2106DK-LF?

Soft-start time t_SS (ms) = 0.45 × C₅ (nF), where C₅ is the capacitor from SS to SGND. For example, a 10nF capacitor yields ~4.5ms soft-start; a 22nF capacitor yields ~10ms. This linear ramp controls FB reference voltage to limit inrush current during startup.

What is the purpose of separating PGND and SGND pins on MP2106DK-LF?

PGND carries high di/dt switching currents from the power MOSFETs, while SGND serves as quiet reference for analog circuits (FB, COMP, SS, RUN). Separating them prevents noise coupling into the feedback path, ensuring stable regulation and minimizing output voltage ripple-PCB layout must tie them together at a single point near the IC.

Does MP2106DK-LF support adjustable output voltage?

Yes-output voltage is set externally via a resistive divider from VOUT to FB. With a fixed 0.895V internal reference, selecting R1 = 10kΩ and calculating R2 = R1 × ((VOUT / 0.895) − 1) allows adjustment from 0.9V up to VIN × 80%. Common values include 1.8V (R2 = 10.1kΩ), 2.5V (R2 = 18.0kΩ), and 3.3V (R2 = 26.9kΩ).

What thermal considerations apply to MP2106DK-LF in MSOP-10 package?

MSOP-10 has θ_JA = 150°C/W (4-layer PCB). At 1.5A/1.8V output with 5V input, power dissipation is ~0.3W; junction temperature rise is ~45°C above ambient. To maintain T_J ≤ 125°C, keep ambient ≤ +80°C and use ≥1cm² copper pour connected to PGND/SGND pins and exposed thermal pad.