MP9447 GL-Z | MPS Core Source System | Device Type: Fully Integrated Synchronous Buck DC-DC Converter (Buck) MPS

I. Interpretation of model suffixes

GL: QFN-25 package, size 3mm × 4mm, with large bottom heat sink pad, silk-screened 9447

‑Z: Wrapping tape packaging, 5000 pieces / plate, SMT mass production;The same model with the suffix ‑P is for pallet packaging.

MSL Level: Level-1, moisture-proof, no strict control, RoHS compliant, industrial temperature grade

Appearance: square QFN package, 3mm × 4mm × 1.0mm, four-corner pins, large exposed pads on the bottom for heat dissipation;The top surface of the chip is printed with "9447" and batch code, suitable for high-density PCB layout, and the heat sink pad must be well grounded for large current applications.

2. Core electrical parameters

form

parameter

Specifications

Input voltage VIN

4.5V-36V, compatible with 12V/ 24V industrial and vehicle bus MPS

Continuous output current

5A, peak current limiting of about 6-8A

Output voltage range

0.8V ~0.9×V IN (max 32.4 V), adjustable resistor divider

Switching frequency

200kHz-650kHz, adjustable external resistance MPS

Built-in MOS

High side 65mοhm, low side 30mοhm, synchronous rectification, no external power MPS required

Reference accuracy

±1.5%, high output precision

Operating temperature

-40°C ~ +125°C (ambient temperature)

Control architecture

Current mode, supports external loop compensation, programmable soft start, low-voltage difference mode

Protection function

OCP overcurrent, SCP short circuit, UVP undervoltage, OTP overheat shutdown protection MPS

efficiency

Full load maximum > 90%, light load with efficient mode

Principle: With built-in high and low side MOSFETs, only inductors, input and output capacitors, and voltage divider resistors are needed to complete the step-down conversion from high voltage to low voltage; External compensation design, convenient for engineers to optimize loop stability.

III. Key Features

Ultra-wide input 4.5-36V, directly compatible with 24V industrial power supply, car 12V battery system, strong anti-input voltage fluctuation ability.

The 5A continuous large current all-integration scheme does not require external MOS, has fewer peripheral devices, and simplifies the design of the power board.

Frequency can be flexibly set, and EMI and inductor volume can be compromised; Supports soft start, suppresses startup surge current.

Complete set of protection, short circuit hiccup protection, abnormal state protection chip and back-end load.

Large heat sink pads at the bottom, PCB heat dissipation design is crucial under 5A high current conditions; The pad must be connected to the ground through more than one hole.

Non-automotive grade components cannot be directly used in automotive AEC‑ Q100 grade projects; automotive grade components must be selected from the MPS automotive grade series.

IV. Typical Application Scenarios

Industrial control board, 24V to multiple low-voltage power supply;

Auxiliary power supply for communication equipment, switches and routers;

Adapter power supply system, high-power USB power supply;

Security equipment, test instruments, embedded systems;

Non-automotive 12V battery-powered equipment (consumer car accessories).

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