Monolithic Power Systems Inc. MP2116DQ-LF-P

Overview

MP2116DQ-LF-P from Monolithic Power Systems is a dual-output power management IC integrating a 2A synchronous step-down DC-DC converter and a standalone 0.5A low-dropout linear regulator (LDO), both regulated down to 0.6V, operating from 2.5V–6V input. It features 1.25MHz fixed-frequency current-mode control, 100% duty-cycle capability for ultra-low dropout, and an open-drain PWROK signal indicating ±10% regulation status of both outputs - used in Li+-powered portable instruments requiring clean, sequenced dual-rail supplies.

For engineers reviewing the MP2116DQ-LF-P datasheet, MP2116DQ-LF-P pinout, MP2116DQ-LF-P application, or MP2116DQ-LF-P equivalent, key selection criteria include verified 2A switcher + 0.5A LDO co-integration, independent IN2 supply routing for noise isolation, thermal shutdown at 150°C, cycle-by-cycle overcurrent protection, and QFN10 (3mm×3mm) package compatibility with high-density PCB layouts.

Technical Context

The MP2116DQ-LF-P implements peak-current-mode PWM control with internal slope compensation, enabling stable operation with ceramic output capacitors and supporting duty cycles up to 100% via integrated P-channel high-side MOSFET. Its dual-regulator architecture separates switching noise-sensitive loads (e.g., RF or ADC circuitry) by feeding the LDO from either the switcher output or main input via dedicated IN2 pin.

Functional block integration includes independent enable inputs (EN1/EN2), separate feedback networks (FB1/FB2) with 0.6V reference, and a shared ground-exposed pad. The PWROK output incorporates asymmetric deglitch timers (50μs for switcher, 150μs for LDO) to prevent false triggers during load transients while ensuring reliable power-good assertion across both rails.

Key Specifications

Pinout & Package

MP2116DQ-LF-P is housed in a thermally enhanced 10-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad (Pin 5) requiring direct connection to PCB ground plane for optimal thermal performance and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2182DQ-LF-Z, MP2116DQ-LF-P trades slightly lower efficiency and higher IQ for proven field reliability and simplified thermal design; versus TPS65023RGZR, it delivers smaller footprint and true 100% duty-cycle operation essential for single-cell Li+ systems operating below 3V.

Availability

MP2116DQ-LF-P is available at Aetrix Electronics and suitable for digital camera power management, smartphone baseband sequencing, portable medical instrumentation, and PDA high-speed interface applications requiring stable component supply across industrial temperature ranges (–40°C to +85°C).

Supply support for MP2116DQ-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, motion control, and automotive applications.

The MP2116 belongs to MPS's integrated power module product line, designed specifically for space-constrained, battery-powered portable electronics requiring high-efficiency DC-DC conversion paired with ultra-low-noise linear regulation.

FAQ

What is the minimum input voltage required for the MP2116DQ-LF-P to regulate a 1.2V output?

The MP2116DQ-LF-P achieves regulation down to VIN = VOUT + dropout voltage. With its 100% duty-cycle capability and 100mV dropout at 150mA, it can maintain 1.2V output from as low as 1.3V input - critical for single-cell Li+ batteries discharging below 3.0V. This is enabled by the integrated P-channel high-side switch, not achievable with standard N-channel-based buck controllers.

Can the LDO (OUT2) be powered directly from the battery while the switcher runs from a different source?

Yes - the LDO's IN2 pin accepts input from 1.0V to VIN1, allowing independent sourcing. For example, IN2 may connect to a primary battery while IN1 connects to a secondary power rail or backup supply. However, the LDO control circuitry draws power from IN1, so IN1 must always be present and ≥1.0V for LDO operation.

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

PWROK remains low until both FB1 and FB2 voltages reach within ±10% of their target values (e.g., 0.6V × [1±0.1]). It then asserts high after deglitch timers (50μs for switcher, 150μs for LDO) confirm stable regulation. During overcurrent or thermal shutdown, PWROK pulls low within microseconds and stays low until both outputs re-stabilize and timers expire.

What is the maximum recommended inductor DCR for 2A switcher operation?

The datasheet specifies inductor DC resistance should be less than 100mΩ for best efficiency at 2A load. Higher DCR increases conduction losses and junction temperature - especially critical in the 10-pin QFN package with θJA = 50°C/W. At 2A, 100mΩ yields 400mW resistive loss alone, consuming ~25% of the 1.6W max allowable power dissipation at 70°C ambient.

Is the MP2116DQ-LF-P RoHS-compliant and lead-free?

Yes - MP2116DQ-LF-P is lead-free and fully compliant with the RoHS directive. The "LF" suffix explicitly denotes lead-free packaging. All MPS products meet JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) and undergo rigorous green process validation per their Quality Assurance documentation.

Why does the MP2116DQ-LF-P use separate EN1 and EN2 pins instead of a single enable?

Independent enables allow precise power sequencing: EN1 can activate the switcher first to establish a clean intermediate rail, then EN2 can enable the LDO after a programmable delay (e.g., via RC network). This prevents LDO overvoltage stress during switcher startup transients and ensures noise-sensitive circuits power up only after stable supply is confirmed.

What happens to the LDO output when IN2 is disconnected while IN1 remains powered?

If IN2 is left floating or disconnected while IN1 is active, the LDO output (OUT2) collapses to near 0V because the internal PNP pass transistor lacks bias and drive. The LDO will not regulate - even if EN2 is high - since IN2 is the sole source for LDO output current. A minimum 1.0V on IN2 relative to GND is mandatory for LDO functionality.