Monolithic Power Systems Inc. MP2269GD-P

Overview

MP2269GD-P 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 and wide-input industrial power supplies.

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

Technical Context

The MP2269GD-P employs current-mode control with peak-current sensing and internal compensation, enabling fast transient response and stable operation across 0.1A–1A loads. Its advanced asynchronous mode (AAM) dynamically disables switching at light load to reduce gate-driving and switching losses, achieving high efficiency down to 100µA output current.

It integrates dual LDO regulators: LDO1 powered from VIN (5V output when VIN > 5V), and LDO2 powered from BIAS (enabling higher efficiency when BIAS ≥ 4.8V). Bootstrap charging is managed via an internal PMOS regulator tied to VCC, supporting high-duty-cycle operation up to ~100% with BST–SW UVLO recovery.

Key Specifications

Pinout & Package

MP2269GD-P is housed in a thermally enhanced QFN-15 package (2mm × 3mm, 0.5mm pitch) with exposed thermal pad (EP) connected to PGND for optimal 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-P, MP2451DJ-LF-Z offers lower cost but sacrifices design flexibility and supervision; TPS561201DRCT simplifies design with internal compensation yet lacks the 3.3V–30V input range and hiccup protection critical for harsh environments.

Availability

MP2269GD-P is available at Aetrix Electronics and suitable for industrial sensor nodes, smart home hubs, automotive body control modules, and portable medical monitors requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP2269GD-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 20 years of expertise in DC/DC conversion, motor drivers, and LED lighting solutions.

The MP2269 belongs to MPS's high-efficiency, wide-input synchronous buck converter product line, designed specifically for battery-powered and industrial systems demanding low IQ, robust fault protection, and flexible frequency configuration.

FAQ

What is the maximum recommended PCB temperature rise for MP2269GD-P under 1A load?

At 1A output and TA = +85°C, the junction temperature must remain below 125°C. With θJA = 70°C/W and PD ≈ 0.3W (based on 180mΩ/80mΩ RDS(ON) and typical efficiency), the allowable ambient-to-PCB temperature rise is ≤20°C. Use 2oz copper, thermal vias under EP, and minimize trace resistance to meet this.

Can MP2269GD-P operate with BIAS unconnected?

Yes - BIAS can be left floating or tied to GND if unused. When BIAS is unconnected, the internal LDO1 (powered from VIN) supplies VCC. This is the default configuration for most applications; connecting BIAS to VOUT improves efficiency only in 5V-output designs.

How does the hiccup over-current protection behave during a sustained short?

When output voltage drops below 70% of nominal, MP2269GD-P shuts down, discharges the SS capacitor, and restarts after full soft-start. Each hiccup cycle lasts ~10–15ms, limiting average power dissipation to <100mW and preventing thermal damage during indefinite faults.

Is the PG pin compatible with 1.8V logic systems?

Yes - PG is open-drain and requires an external pull-up. To interface with 1.8V logic, pull PG to 1.8V via a 100kΩ resistor. The internal MOSFET pulls PG to <0.4V when active, ensuring valid low-level signaling for 1.8V I/O thresholds.

What is the minimum recommended soft-start capacitor value?

The minimum soft-start time is 800µs. Using ISS = 10µA and VOFFSET ≈ 0.6V, a 1nF capacitor yields ~800µs (TSS ≈ 1.125 × VFB × CSS / ISS). For robustness against noise and variation, 12nF (typical in eval boards) is recommended to achieve ~10ms startup.

Does MP2269GD-P support output voltages below 0.8V?

No - the internal feedback reference is fixed at 0.8V ±16mV. Output voltage is set by the resistor divider ratio: VOUT = 0.8V × (1 + R1/R2). The lowest practical VOUT is ~0.85V (using R2 = 100kΩ, R1 = 5kΩ), limited by resistor tolerance and FB accuracy.

How is thermal shutdown triggered and released?

Thermal shutdown activates at TJ = 170°C (±5°C) and releases at TJ = 150°C (170°C – 20°C hysteresis). The shutdown signal disables both MOSFETs immediately; recovery requires die cooling below 150°C, after which normal operation resumes without external reset.