Monolithic Power Systems Inc. MP2322GQH-P

Overview

MP2322GQH-P from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 260mΩ high-side and 120mΩ low-side MOSFETs, delivering 1A continuous output current across a 3V–22V input range. It features 5μA quiescent current, constant-on-time (COT) control for fast transient response, power-good (PG) indication, and full protection including OCP, OVP, and thermal shutdown - deployed in battery-powered IoT sensors and home security systems.

For engineers reviewing the MP2322GQH-P datasheet, MP2322GQH-P pinout, MP2322GQH-P application, or MP2322GQH-P equivalent, key selection criteria include light-load efficiency down to 100μA, 1.25MHz fixed switching frequency in CCM, adjustable output from 0.6V, EN-controlled shutdown with output discharge, and QFN-8 (1.5×2mm) package constraints for space-constrained PCB layouts.

Technical Context

The MP2322GQH-P uses constant-on-time (COT) control architecture with valley-current limiting and automatic mode transition between PWM and power-save mode (PSM), enabling seamless load-step response and high efficiency at ultra-light loads. Its internal 3.3V LDO powers control circuitry and drivers, while bootstrap charging supports high-side N-channel MOSFET operation up to 96% duty cycle.

Protection logic includes hiccup-mode over-current response, 8μs deglitched output over-voltage detection (116–126% V_REF trip), and thermal shutdown at 150°C with 20°C hysteresis. The PG pin provides open-drain status signaling with 200μs rise delay and 50μs fall delay, tied to both UV (87% V_REF) and OV (113% V_REF) thresholds.

Key Specifications

Pinout & Package

MP2322GQH-P is housed in a thermally enhanced QFN-8 package measuring 1.5mm × 2mm with 0.4mm pitch and exposed thermal pad. The package supports high-density layout and efficient heat dissipation when the thermal pad is soldered to a dedicated PCB copper plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62840DLCR and RT7297CGQW, MP2322GQH-P uniquely balances 1A capability, 5μA IQ, 3–22V flexibility, and integrated PG in a 1.5×2mm footprint - making it optimal for space- and energy-constrained 12V-input IoT edge nodes requiring reliable power sequencing.

Availability

MP2322GQH-P is available at Aetrix Electronics and suitable for IoT sensor nodes, home security cameras, and white goods control panels requiring stable component supply across long production lifecycles and seasonal demand spikes.

Supply support for MP2322GQH-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 power management ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP2322 belongs to MPS's low-IQ synchronous buck converter product line, engineered specifically for battery-powered and energy-sensitive applications where extended runtime, small solution size, and robust protection are mandatory.

FAQ

What is the minimum output voltage achievable with MP2322GQH-P?

The MP2322GQH-P has a feedback reference voltage of 600mV ±1%, allowing output voltages as low as 0.6V when configured with an appropriate resistor divider. Output accuracy is maintained across temperature (±1.5% drift) and line/load conditions, making it suitable for powering low-voltage cores such as 0.8V I/O domains in modern MCUs when paired with external level-shifting.

Does MP2322GQH-P support pre-biased output startup?

Yes - MP2322GQH-P implements monotonic pre-bias start-up. When enabled into a pre-charged output, the internal soft-start capacitor charges only after the BST voltage exceeds its 2.2V UVLO threshold and the sensed FB voltage remains below the rising SS voltage. This prevents reverse current flow and ensures controlled ramp-up even when V_OUT is initially non-zero.

How does the power-good (PG) pin behave during thermal shutdown?

During thermal shutdown activation (junction temperature ≥150°C), the PG pin is pulled low immediately - independent of FB voltage - providing unambiguous fault signaling. PG remains low until thermal recovery (T_J ≤130°C), soft-start completes, and V_FB rises above 92% of V_REF, followed by the standard 200μs assertion delay.

Can MP2322GQH-P operate with input voltage below 3V?

No - the absolute minimum input voltage is 3V per datasheet specifications. Below this, the internal bias circuitry cannot sustain regulation, and UVLO prevents startup. The device will not function reliably at 2.9V or lower, even momentarily; design margin should maintain VIN ≥3.1V under worst-case droop conditions.

What is the recommended BST capacitor value and dielectric type?

A 0.1μF X7R or X5R ceramic capacitor is required between BST and SW pins. It must be placed within 1mm of the BST pin with minimal trace length and no vias. The capacitor must withstand ≥6.5V rating (derated for temperature and DC bias) and exhibit low ESR (<100mΩ) to ensure stable bootstrap voltage during high-duty-cycle operation.

Is output discharge active during EN-controlled shutdown only, or also during UVLO?

Output discharge is active exclusively during EN-driven shutdown. When EN is pulled low, the LS-FET turns on periodically to sink current until V_FB drops near 0V. During input UVLO (VIN <2.63V), the device shuts down but does not engage LS-FET discharge - V_OUT decays passively through external loads and feedback resistors.

What is the maximum allowable output capacitance for reliable soft-start?

The datasheet specifies a maximum output capacitance of 470μF to avoid triggering current limit during startup. Exceeding this value increases inrush charge time, causing the internal soft-start timer to expire before V_OUT reaches regulation - resulting in repeated hiccup-mode restart attempts or failure to stabilize.