Monolithic Power Systems Inc. MPQ2122GJ-P

Overview

MPQ2122GJ-P from Monolithic Power Systems is a dual-channel, synchronous step-down DC/DC regulator with integrated 80mΩ high-side and 35mΩ low-side MOSFETs per channel, operating from 2.7V–6V input to deliver two independent 2A outputs down to 0.608V. It features 1MHz fixed-frequency PWM control, 180° inter-channel phase shift, 45µA quiescent current, and hiccup-mode short-circuit protection - optimized for single-cell Li+-powered portable electronics.

For engineers reviewing the MPQ2122GJ-P datasheet, MPQ2122GJ-P pinout, MPQ2122GJ-P application, or MPQ2122GJ-P equivalent, key selection criteria include dual-output synchronization capability, TSOT23-8 thermal performance (θJA = 100°C/W), light-load DCM efficiency (>80%), cycle-by-cycle current limiting (3.5A typ.), and 100% duty-cycle operation for low-dropout scenarios.

Technical Context

The MPQ2122GJ-P implements peak-current mode control with internal compensation, eliminating external loop compensation components. Each channel operates independently with dedicated FB, EN, and SW pins, supporting asynchronous enable sequencing and output voltage adjustment via resistor dividers.

Its 180° phase-shifted switching reduces input ripple current by ~70% versus in-phase operation, enabling smaller input capacitors. Under light load, it transitions to discontinuous conduction mode (DCM) with valley-switching to maintain >80% efficiency at 10mA output, while thermal shutdown activates at 160°C with 30°C hysteresis.

Key Specifications

Pinout & Package

MPQ2122GJ-P is housed in an 8-pin TSOT23-8 package with exposed thermal pad (GND-connected), optimized for high-density portable PCB layouts. Pin 5 is the common GND terminal shared by both channels and serves as primary thermal path.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.

Compared with TPS65217C and RTQ2132B-QT, MPQ2122GJ-P delivers superior light-load efficiency and smaller footprint for portable consumer designs, while offering more robust short-circuit recovery than the automotive variant and simpler integration than the feature-rich PMIC.

Availability

MPQ2122GJ-P is available at Aetrix Electronics and suitable for smartphone power management, portable medical instrumentation, DVD drive modules, and handheld barcode scanners requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for MPQ2122GJ-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 MPQ2122 belongs to MPS's MPQ-series automotive-qualified and industrial-grade DC/DC converters, designed specifically for space-constrained, battery-operated portable electronics demanding high efficiency, low IQ, and dual-rail flexibility.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MPQ2122GJ-P requires ≥22µF ceramic output capacitance per channel using X5R or X7R dielectric. Lower values risk instability due to insufficient phase margin; electrolytic capacitors are discouraged unless ESR is tightly controlled and feedback compensation is re-optimized per application note AN-101.

Can MPQ2122GJ-P operate with only one channel enabled?

Yes - EN1 and EN2 are independent logic inputs. Disabling one channel (ENx = low) places its high-side and low-side MOSFETs in high-impedance state, reducing quiescent current to ~25µA total. The active channel continues full regulation without interference.

Does the 180° phase shift apply under all load conditions?

No - 180° phase shift is maintained only in continuous conduction mode (CCM) with sufficient input-to-output voltage differential. During light load (DCM) or low dropout (fixed OFF-time mode), phase relationship is not enforced, though each channel remains functional.

What is the maximum allowable PCB temperature rise above ambient for reliable operation?

With standard 4-layer PCB layout per JEDEC JESD51-7 (2 oz Cu, 1-in² GND pour, 6 vias), junction temperature must stay ≤125°C. At TA = 85°C, this permits ≤40°C rise - achievable with θJA = 100°C/W and <1.25W total dissipation (verified at 2A × 0.1V dropout = 0.2W per channel).

How does the hiccup-mode recovery timing behave during persistent short circuit?

Upon detecting >400µs current limit event, MPQ2122GJ-P enters hiccup mode: disables outputs, discharges soft-start capacitor over ~5ms, then initiates new 0.5ms soft-start ramp. Cycle repeats every ~6ms until fault clears - preventing thermal accumulation while maintaining detectability.

Is the FB voltage reference trimmed across temperature?

Yes - VFB is specified as 0.608V (typ.) with ±1.2% tolerance over –40°C to +125°C (0.59V to 0.626V). This tight drift ensures <±2% output voltage error across industrial temperature range without external calibration.

Can the switching frequency be adjusted externally?

No - MPQ2122GJ-P uses a fixed 1MHz internal oscillator. Frequency variation occurs only during light-load DCM or low-dropout fixed-OFF-time operation; no external sync or resistor-programmable option exists per datasheet Rev. 1.0.