Monolithic Power Systems Inc. MPM38222GR-Z

Overview

MPM38222GR-Z from Monolithic Power Systems is a dual-channel, synchronous step-down power module integrating two 2A DC/DC converters, internal MOSFETs (80mΩ high-side / 35mΩ low-side), and shielded inductors in a single QFN-14 package. It operates from 2.7V–6V input, delivers output as low as 0.608V per channel, and achieves >93% peak efficiency-ideal for space-constrained, battery-powered systems like optical transceivers and IoT edge nodes.

For engineers reviewing the MPM38222GR-Z datasheet, MPM38222GR-Z pinout, MPM38222GR-Z application, or MPM38222GR-Z equivalent, key selection criteria include its integrated inductor architecture, 180° phase-shifted dual-channel operation to minimize input ripple, ultra-low 45µA quiescent current, and built-in cycle-by-cycle OCP with hiccup-mode short-circuit protection.

Technical Context

The MPM38222GR-Z implements peak-current-mode control with internal compensation per channel, eliminating external loop components while enabling fast transient response. Each channel features independent enable (EN1/EN2) and feedback (FB1/FB2) pins, supporting asymmetric output configurations (e.g., 1.8V/1.2V) with 0.608V reference voltage.

It supports 180° inter-channel phase shifting by default to halve input capacitor RMS current, operates down to 100% duty cycle for ultra-low dropout, and transitions seamlessly between PWM, fixed-off-time, and DCM modes based on load and VIN–VOUT differential-enabling stable regulation across portable Li+-battery discharge profiles (2.7V–4.2V).

Key Specifications

Pinout & Package

MPM38222GR-Z is housed in a thermally enhanced, surface-mount QFN-14 package (4mm × 4mm × 1.6mm) with exposed thermal pad for PCB heat sinking. The package complies with JEDEC MO-220 and supports reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, integrated-inductor buck converter applications.

Compared with MPM38222GR-Z, the MPM3830CGR-Z sacrifices channel independence for higher single-rail current, while the TPS84250RMLR trades compactness and low-VIN support for wider input range and higher power-making MPM38222GR-Z optimal for space- and battery-constrained dual-rail designs.

Availability

MPM38222GR-Z is available at Aetrix Electronics and suitable for optical transceivers, industrial IoT gateways, and medical wearables requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MPM38222GR-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 manufacturing partnerships.

The MPM38222 belongs to MPS's integrated power module product line, engineered specifically for miniaturized, high-efficiency DC/DC conversion in portable and space-constrained electronics where layout simplicity and thermal performance are critical.

FAQ

What is the minimum input voltage required for MPM38222GR-Z to regulate both channels?

The MPM38222GR-Z maintains regulation down to 2.7V input across its full operating temperature range (-40°C to +125°C). Below this, UVLO disables both channels to prevent unstable operation. This 2.7V threshold aligns with the end-of-discharge voltage of single-cell Li+ batteries, enabling full utilization of battery capacity without external pre-buck stages.

Can MPM38222GR-Z operate with only one channel enabled?

Yes. EN1 and EN2 are independently controlled logic inputs. Driving EN1 high and EN2 low powers only Channel 1, with Channel 2 fully disabled and drawing <1µA. This allows flexible power sequencing, dynamic rail shutdown, or asymmetric loading-e.g., powering a processor core while keeping peripherals off until needed.

How does the 180° phase shift improve system-level performance?

The 180° phase shift causes input current waveforms from each channel to cancel partially at the VIN node, reducing total RMS input ripple current by up to 70%. This allows use of smaller, lower-ESR input capacitors (e.g., single 22µF ceramic instead of two 10µF), lowers conducted EMI, and eases input filter design without compromising transient response.

What is the recommended output capacitor configuration for optimal transient response?

MPS recommends 22µF X5R/X7R ceramic capacitors per channel, placed within 3mm of OUT1/OUT2 and GND. For 1.2V/1.8V outputs, Table 2 specifies R1/R2 values (e.g., 200kΩ/200kΩ for 1.2V) to set loop bandwidth near 50–100kHz-balancing phase margin and load-step recovery time while avoiding instability from ceramic capacitor zero.

Does MPM38222GR-Z require external compensation components?

No. The MPM38222GR-Z uses internal compensation optimized for its integrated power stage and typical output capacitor values (22µF ceramic). No external RC networks or type-II/type-III compensators are needed-reducing design risk, BOM cost, and layout sensitivity compared to controller-based solutions.

How is thermal performance validated in the QFN-14 package?

Thermal resistance is characterized per JEDEC 51-7 on a 4-layer PCB with 2oz copper, achieving θJA = 44°C/W and θJC = 9°C/W. The exposed thermal pad must be soldered to a solid inner-layer ground plane; thermal vias (≥6×0.3mm) beneath the pad are mandatory to transfer heat to internal planes and sustain 2A/channel continuous operation at 25°C ambient.

What failure protections activate during a sustained output short circuit?

Upon short circuit, cycle-by-cycle OCP limits peak inductor current to ~3.5A. When VFB drops below 75% of 0.608V (≈0.46V), the device enters hiccup mode: it shuts down for ~10ms, then attempts restart. This limits average short-circuit power dissipation to <100mW, preventing thermal runaway and enabling safe auto-recovery once fault clears.