Monolithic Power Systems Inc. MP2101DQ-LF-Z

Overview

MP2101DQ-LF-Z 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 features 1.6MHz fixed-frequency PWM control with 100% duty cycle capability for Li+-battery-powered portable instruments.

For engineers reviewing the MP2101DQ-LF-Z datasheet, MP2101DQ-LF-Z pinout, MP2101DQ-LF-Z application, or MP2101DQ-LF-Z equivalent, key selection considerations include dual-rail sequencing via independent EN1/EN2 enables, PWROK open-drain power-good monitoring with ±10% window and deglitch timers, and separate IN1/IN2 supplies enabling noise-isolated LDO operation.

Technical Context

The MP2101DQ-LF-Z implements peak current-mode PWM control with internal slope compensation and fixed 1.6MHz oscillator, enabling stable regulation using ceramic output capacitors and small inductors. Its integrated high-side PFET (0.35Ω) and synchronous NFET rectifier (0.25Ω) eliminate external diode requirements and support up to 93% efficiency at 600mA load.

The LDO channel uses a dedicated IN2 input pin and internal bias derived from IN1, allowing VIN2 to be sourced independently (e.g., from switcher output or main rail) to reduce noise coupling and thermal dissipation. Its 280mV dropout at 150mA and ±10% PWROK window with 150µs deglitching ensure robust power sequencing in noise-sensitive subsystems.

Key Specifications

Pinout & Package

MP2101DQ-LF-Z is housed in a thermally enhanced 3mm × 3mm, 10-pin QFN package with exposed pad for improved heat dissipation. The package supports –40°C to +85°C ambient operation and is RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output power management applications.

Compared with TPS62130ARGTR and RT8059ZSP, MP2101DQ-LF-Z uniquely integrates sequenced enable, open-drain PWROK, and 100% duty cycle in a 3×3mm footprint-making it optimal for Li+-powered systems requiring guaranteed rail coordination and extended battery runtime.

Availability

MP2101DQ-LF-Z is available at Aetrix Electronics and suitable for smartphone baseband power, digital camera image sensor bias, portable medical instrumentation, and handheld test equipment requiring stable component supply across production lifecycles.

Supply support for MP2101DQ-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, and global distribution through authorized partners.

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

FAQ

What is the minimum input voltage required for the MP2101DQ-LF-Z to regulate both outputs?

The MP2101DQ-LF-Z requires a minimum 2.5V on IN1 to maintain regulation on the 800mA switcher output. The LDO channel (OUT2) requires IN2 ≥ 1.2V and ≤ IN1; its dropout voltage is 280mV at 150mA, so IN2 must exceed the desired VOUT2 by at least that margin. Both rails remain functional down to 2.5V input with appropriate output voltage selection.

Can the MP2101DQ-LF-Z operate with only the LDO enabled while the switcher is disabled?

Yes. EN1 and EN2 are independent controls: pulling EN1 low disables the switcher (reducing quiescent current to 0.01µA), while EN2 high enables the LDO if IN2 is supplied and within 1.2V–VIN1 range. However, the LDO control circuitry draws bias from IN1, so IN1 must be present even when the switcher is off.

How does the PWROK signal behave during load transients?

PWROK remains asserted during fast load steps because it incorporates built-in deglitch timers: 50µs for the switcher channel and 150µs for the LDO channel. These timers prevent false low assertions caused by brief output deviations outside the ±10% regulation window during transient events.

What is the recommended inductor value and why?

A 2.2µH inductor is recommended for most applications, balancing efficiency, size, and transient response. At 1.6MHz switching frequency and 800mA maximum load, this value yields ~30% inductor ripple current (≈240mA), minimizing output voltage deviation while keeping peak current within safe limits for the internal MOSFETs.

Does the MP2101DQ-LF-Z require external compensation components?

No. The MP2101DQ-LF-Z uses internal compensation optimized for ceramic output capacitors. Stability is achieved with standard 10µF X5R/X7R MLCCs on the switcher output and 1µF on the LDO output-no external compensation network is needed.

How is thermal performance affected by PCB layout?

Thermal resistance θJA is specified at 50°C/W for a 1"² copper pad. Performance degrades significantly without proper thermal vias under the exposed pad: fewer than six 0.3mm vias increases θJA by >15°C/W, risking thermal shutdown above 70°C ambient at full load. Layout must connect the pad directly to inner-layer ground planes.

What happens during input undervoltage lockout (UVLO)?

When IN1 falls below 1.5V (rising threshold), the switcher shuts down and PWROK goes low. UVLO has 100mV hysteresis, so the switcher re-enables only after IN1 rises above 2.0V. The LDO remains functional if EN2 is high and IN2 is valid, but its output will drop if IN2 sags below VOUT2 + dropout.