Monolithic Power Systems Inc. MP2101DQ-LF-P

Overview

MP2101DQ-LF-P from Monolithic Power Systems is a dual-output power management IC integrating an 800mA synchronous step-down switcher and a 200mA low-dropout linear regulator in a single 3mm × 3mm QFN-10 package. It operates from 2.5V–6V input, delivers regulated outputs down to 0.6V, and supports 100% duty cycle for Li+-battery-powered portable devices such as smart phones and digital cameras.

For engineers reviewing the MP2101DQ-LF-P datasheet, MP2101DQ-LF-P pinout, MP2101DQ-LF-P application, or MP2101DQ-LF-P equivalent, key selection criteria include dual-channel regulation stability, 1.6MHz fixed-frequency operation with ceramic-capacitor compatibility, independent enable control per channel, PWROK monitoring with ±10% window, and thermal/overcurrent protection architecture.

Technical Context

The MP2101DQ-LF-P implements peak current-mode PWM control with internal slope compensation and fixed 1.6MHz oscillator frequency, enabling stable regulation using small external inductors (e.g., 2.2µH) and low-ESR ceramic capacitors. Its dual feedback loops-FB1 for the switcher and FB2 for the LDO-each reference a precise 0.6V internal bandgap, supporting output voltage setting via external resistor dividers.

It features two independent input supplies: IN1 powers both the switcher and LDO control circuitry, while IN2 feeds only the LDO pass device-reducing noise coupling and dissipation. The PWROK open-drain output asserts high only when both OUT1 and OUT2 remain within ±10% of target for ≥50µs (switcher) and ≥150µs (LDO), preventing false triggers during transients.

Key Specifications

Pinout & Package

MP2101DQ-LF-P is housed in a thermally enhanced 3mm × 3mm, 10-pin QFN package with exposed thermal pad on the underside. The package supports reflow soldering and provides θ_JA = 50°C/W and θ_JC = 12°C/W for effective power dissipation in space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output DC-DC + LDO applications.

Compared with TPS62260DRVR and RT8059ZSP, MP2101DQ-LF-P uniquely integrates synchronized dual regulation with dedicated LDO input, ±10% PWROK monitoring, and 100% duty cycle-enabling simpler, more robust power architecture for battery-powered systems where noise, sequencing, and low-input operation are critical.

Availability

MP2101DQ-LF-P is available at Aetrix Electronics and suitable for smartphone baseband power, digital camera image sensor bias, portable medical pulse oximeters, and industrial handheld scanners requiring stable component supply across production lifecycles.

Supply support for MP2101DQ-LF-P 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 mixed-signal ICs for power management, motor drive, and automotive applications.

The MP2101 belongs to MPS's integrated power management product line, designed specifically for space- and efficiency-constrained portable electronics powered by single-cell Li-ion batteries.

FAQ

What is the minimum input voltage required for full 800mA switcher output?

The MP2101DQ-LF-P guarantees 800mA output down to 2.5V input under typical conditions. Below this, maximum load current decreases due to increased conduction losses in the integrated PFET and NFET. At 2.5V input and 1.8V output, the device maintains regulation via 100% duty cycle operation, though thermal limits may constrain sustained 800mA delivery in high ambient temperatures.

Can IN2 be connected directly to IN1 without filtering?

Yes, IN2 can be tied directly to IN1, but MPS recommends inserting an RC filter (e.g., 10Ω + 1µF) between them when IN1 is sourced from the switcher output. This attenuates high-frequency switching noise from coupling into the LDO input, preserving its PSRR performance and output voltage stability-especially critical for analog sensor or RF bias applications.

How does the PWROK signal behave during startup and fault conditions?

PWROK remains low until both OUT1 and OUT2 reach and sustain regulation within ±10% of their target voltages for ≥50µs (switcher) and ≥150µs (LDO). It goes low immediately if either output drifts outside that window, EN1 or EN2 is deasserted, or thermal shutdown activates. The deglitch timers prevent false toggling during transient load steps or input ramp-up.

What is the recommended inductor value and why?

MPS specifies 2.2µH as the optimal inductor value (e.g., Sumida CDRH2D11) for most applications. This balances ripple current (~30% of 800mA), efficiency (>93% at 3.3V input), and physical size. Lower values increase ripple and EMI; higher values improve light-load efficiency but reduce transient response speed and require larger footprints.

Does the MP2101DQ-LF-P support adjustable output voltages below 0.6V?

No-the internal feedback reference is fixed at 0.600V ±12mV, and the datasheet specifies a minimum output voltage of 0.6V. Attempting to set lower outputs via resistor divider violates the guaranteed operating conditions and risks regulation loss, as the error amplifier cannot drive the output below its reference threshold.

How is thermal performance managed in the QFN-10 package?

The 3mm × 3mm QFN-10 package includes an exposed thermal pad soldered to a PCB copper pour. With θ_JA = 50°C/W, the device dissipates up to ~1.6W at 70°C ambient before reaching the 150°C junction limit. Layout best practices-short wide traces on IN1, SW1, and GND; direct thermal pad connection to ≥2 cm² inner-layer copper-ensure reliable operation at full load.

Is the LDO output protected against short circuits?

Yes-the LDO includes foldback current limiting. When OUT2 is shorted, output current drops to ~180mA (typical), limiting power dissipation and preventing thermal runaway. Recovery is automatic once the short is removed and FB2 voltage rises above 0.6V, with no latch-off or manual reset required.