Monolithic Power Systems Inc. MP3422GG-P

Overview

MP3422GG-P from Monolithic Power Systems is a synchronous step-up DC-DC converter with true output disconnect, designed for battery-powered systems requiring high efficiency and compact footprint. It operates from 1.9V–5.5V input, delivers up to 5.5V output, supports 6.5A switch current limit, achieves 98% peak efficiency at 5V/2.5A, and integrates internal NMOS/PMOS switches in a 2×2mm QFN-14 package - enabling USB power bank and portable accessory designs with minimal external components.

For engineers reviewing the MP3422GG-P datasheet, MP3422GG-P pinout, MP3422GG-P application, or MP3422GG-P equivalent, key selection criteria include its 600kHz fixed-frequency current-mode control, 43µA quiescent current in normal operation, integrated soft-start and compensation, true output disconnect during shutdown, and robust protection suite (OCP, SCP, OVP, OTP, UVLO).

Technical Context

The MP3422GG-P implements fixed-frequency (600kHz) current-mode PWM control with internal slope compensation and an error amplifier referenced to 807mV. Its startup sequence includes linear charge mode (0.2A–0.7A programmable limit) until VOUT reaches 1.7V, then transitions to boost mode with ≥6.5A switch current capability when VOUT ≥ VIN + 0.3V.

It features dual MOSFET integration: a 13mΩ NMOS main switch and an 18mΩ PMOS synchronous rectifier that also enables true output disconnect by blocking body diode conduction. Bias sourcing automatically shifts from IN to OUT once VOUT exceeds VIN, ensuring stable operation independent of input rail collapse.

Key Specifications

Pinout & Package

MP3422GG-P is housed in a thermally enhanced 2mm × 2mm QFN-14 package with exposed thermal pad (PGND-connected). The package supports high-density layout and efficient heat dissipation in portable devices.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-up converter applications.

Compared with TPS61088RHLR and RT9086AGQW, MP3422GG-P uniquely combines 6.5A capability, true output disconnect, internal compensation, and 43µA I_Q in a 2×2mm footprint - making it optimal for space-constrained, battery-isolation-critical applications like power banks and wearables.

Availability

MP3422GG-P is available at Aetrix Electronics and suitable for USB power banks, wireless charging transmitters, Bluetooth headset charging cases, and smart wearable power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP3422GG-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 power ICs, with over two decades of leadership in DC-DC conversion, motor drivers, and LED lighting controllers.

The MP3422 belongs to MPS's high-efficiency synchronous boost converter product line, engineered specifically for portable battery-powered systems demanding ultra-small form factor, low quiescent current, and robust fault protection without external components.

FAQ

What is the minimum input voltage required for MP3422GG-P to start switching?

The MP3422GG-P begins startup when the IN pin voltage exceeds the rising UVLO threshold of 1.3V (typical). However, functional operation at rated output requires ≥1.9V input; below this, the device may enter undervoltage lockout or fail to sustain regulation under load.

Does MP3422GG-P support adjustable output voltage, and how is it set?

Yes - output voltage is set via an external resistor divider from OUT to AGND, connected to the FB pin. Using V_OUT = 0.807V × (1 + R1/R2), values like R1 = 787kΩ and R2 = 150kΩ yield 5.0V. R1 should exceed 600kΩ for stability and low quiescent current.

How does the MP3422GG-P achieve true output disconnect, and what is required to maintain it?

True disconnect is enabled by the internal PMOS synchronous rectifier, which blocks body diode conduction when EN is low. To preserve this feature, no external Schottky diode must be placed between SW and OUT - doing so would create a parallel conduction path and defeat isolation.

What thermal performance can be expected in a 2-layer PCB layout?

On a standard 2-layer board with 1oz copper and minimal thermal vias, θ_JA is ~80°C/W. At 2.5A/5V output and 2.8V input, power dissipation is ~0.35W - resulting in ~28°C junction rise above ambient. Adding 4–6 thermal vias under the exposed pad reduces θ_JA to ~45°C/W.

Is MP3422GG-P compatible with lithium iron phosphate (LiFePO₄) batteries?

Yes - its 1.9V–5.5V input range fully covers the LiFePO₄ discharge curve (2.5V–3.65V). The 43µA quiescent current and UVLO hysteresis (650mV falling threshold) prevent brownout oscillation during deep discharge, supporting reliable operation down to 2.5V.

Can MP3422GG-P operate in buck mode, and when does it engage?

Yes - when VOUT < VIN + 0.3V and ≥1.7V, the device enters "down mode" using the PMOS as a pass element with 4A typical current limit. This mode is intended only for startup and short-circuit recovery; sustained operation in down mode degrades efficiency and regulation.

What is the recommended output capacitor value for a 5V/2.5A application?

MPS specifies a minimum 22µF X5R/X7R ceramic capacitor at the output. For optimal ripple suppression (<20mV p-p) and transient response, use ≥47µF total capacitance - e.g., one 22µF bulk cap plus two 10µF local caps placed adjacent to the OUT and PGND pins.