Monolithic Power Systems Inc. MP2269GD-Z

Overview

MP2269GD-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 180mΩ high-side and 80mΩ low-side MOSFETs, delivering 1A continuous output current across a 3.3V–30V input range. It features programmable switching frequency (350kHz–2.5MHz), 12µA sleep-mode quiescent current, external soft-start control, and open-drain power-good output - enabling reliable regulation in battery-powered smart home systems and wide-input industrial power supplies.

For engineers reviewing the MP2269GD-Z datasheet, MP2269GD-Z pinout, MP2269GD-Z application, or MP2269GD-Z equivalent, key selection criteria include its 80ns minimum on-time for high-duty-cycle operation, hiccup-mode over-current protection, selectable forced-PWM/auto-PFM mode via MODE pin, and QFN-15 (2mm×3mm) thermal performance with θJA = 70°C/W.

Technical Context

The MP2269GD-Z employs current-mode control with cycle-by-cycle peak-current limiting and advanced asynchronous mode (AAM) for light-load efficiency optimization. Its internal error amplifier compares FB voltage against a precise 0.8V reference and drives VCOMP to regulate output via PWM duty cycle.

It integrates dual bias paths: LDO1 powered from VIN (regulating to 5V when VIN > 5V) and LDO2 activated when BIAS > 4.8V, allowing flexible power sourcing. Bootstrap charging uses an internal regulator with UVLO protection to maintain BST–SW ≥ 2.5V during dropout operation.

Key Specifications

Pinout & Package

MP2269GD-Z is housed in a thermally enhanced QFN-15 package (2mm × 3mm, 0.5mm pitch) with exposed thermal pad (EP) connected to PGND for efficient heat dissipation. The package supports reflow soldering per JEDEC J-STD-020 and achieves θJA = 70°C/W on a 4-layer PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2269GD-Z, MP2451DT-LF-Z trades frequency flexibility and ultra-low IQ for smaller BOM count, while TPS561201DRCT offers higher output current but significantly higher quiescent draw and incompatible pin mapping - making MP2269GD-Z optimal for space-constrained, battery-backed, and EMI-sensitive applications requiring precise control.

Availability

MP2269GD-Z is available at Aetrix Electronics and suitable for smart home sensor hubs, industrial PLC I/O modules, portable medical monitors, and automotive aftermarket telematics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MP2269GD-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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP2269 belongs to MPS's high-efficiency, wide-input buck converter product line, designed specifically for battery-powered and industrial systems demanding low quiescent current, robust protection, and compact packaging.

FAQ

What is the recommended soft-start capacitor value for a 2ms startup time?

Using the formula CSS(nF) = (TSS(ms) × ISS(µA)) / (1.125 × VREF(V)), with ISS = 10µA and VREF = 0.8V, a 2ms soft-start requires a 22nF capacitor. A standard 22nF X7R ceramic capacitor placed from SS to AGND achieves this, ensuring monotonic VOUT rise without overshoot.

Can BIAS be left unconnected, and what is the impact?

Yes, BIAS can be left unconnected or tied to AGND if not used. In that case, the internal LDO1 powers all circuitry from VIN. When VIN > 5V, VCC regulates to 5V; below 5V, VCC degrades linearly. Leaving BIAS unconnected simplifies design but forfeits the efficiency gain achievable when BIAS is tied to VOUT in 5V-output applications.

How does the MP2269GD-Z handle output short-circuit conditions?

Under sustained short-circuit, the MP2269GD-Z enters hiccup mode: it shuts down, discharges the soft-start capacitor, then restarts after full discharge. This cycle repeats until the fault clears. Each hiccup event limits energy delivery, keeping junction temperature within safe limits and preventing permanent damage without requiring external current-limit circuitry.

Is the PG pin compatible with 3.3V logic systems?

Yes - the PG pin is open-drain and rated for 32V maximum, so it can be pulled up to 3.3V using a 100kΩ resistor. When active, PG pulls low to <0.4V at 2mA sink, meeting standard 3.3V logic low thresholds. Its UV/OV windows (±5% around 0.8V reference) remain accurate regardless of pull-up voltage.

What is the maximum allowable thermal pad copper area for optimal θJA?

Per MPS AN-107 layout guidelines, the thermal pad should be connected to a minimum 100mm² internal or bottom-layer copper pour, segmented into 9–16 vias (0.3mm diameter, 0.6mm pitch) to inner ground planes. Exceeding this area yields diminishing returns; 100mm² achieves the specified θJA = 70°C/W on a 4-layer board.

Does the MP2269GD-Z support output voltages below 0.8V?

No - the internal feedback reference is fixed at 0.8V, and the FB pin is designed for resistive divider-based scaling. Output voltages lower than 0.8V cannot be regulated because the error amplifier lacks offset adjustment or external reference input capability. Minimum regulated output is 0.8V (direct FB connection).

How is frequency foldback implemented during startup?

During startup, the MP2269GD-Z automatically reduces switching frequency to prevent inductor current runaway. This is achieved by dynamically lowering the oscillator's control voltage based on VCOMP level - reducing fSW until VOUT reaches regulation, then restoring programmed frequency. No external components are required.