MP9943GQ | MPS (Silan Systems) | Synchronous Step-Down DC-DC Buck Converter

I. Appearance and Packaging

Package: QFN-8, 3mm × 3mm, leadless DFN, thin-profile surface-mount, minimal PCB footprint.

Screen-printed marking: AMGY (AMG = MP9943GQ, where Y represents the year code + batch number)

Model suffix explaination:

MP9943GQ: Bare Device

MP9943GQ-Z: Tape and Reel (Standard Supply)

MP9943GQ-P: Tray packaging

Pins: 8-pin, including IN, SW, BST, FB, PG, EN/SYNC, PG, EN/SYNC, VCC, GND, integrated BOOST, with few external components required.

II. Core Electrical Parameters

Input voltage

Continuous operation: 4V~30V

The transient voltage tolerance is up to 36V, making it suitable for scenarios with high-voltage spikes.

output

Peak current: 3A

Output is adjustable: starting from 0.8V, set via the FB voltage divider resistors.

Built-in MOS

Upper tube Rds(on) = 85 mΩ;Lower on-resistance (Rds(on)) = 55 mΩ, synchronous rectification, high efficiency.

Switching frequency

Default internal: 410 kHz

External clock synchronization: 200 kHz to 2.2 MHz, facilitating noise reduction in multi-power supply systems.

Control Architecture: Current-Mode✅Fast transient response, simple loop compensation, and easy to stabilize.

Temperature range: -40°C to +125°C (TJ, junction temperature)

III. Built-in Features (Highlights)

✅Internal soft start: Suppresses power-on surge.

✅Power Good (PG, power supply normal signal): Used for power readiness detection of the MCU.

✅Power-Save Mode: Automatic frequency reduction under light load to improve efficiency.

✅High Duty Cycle Capability: Supports automotive cold-start scenarios

✅Comprehensive Protection: Overcurrent hiccup protection, overheat shutdown, input undervoltage protection.

IV. Typical Application Scenarios

Distributed onboard power supply, industrial equipment, multifunction printers (MFP)

Vehicle-mounted auxiliary power supply (non-main automotive-grade, suitable for cold-start scenarios of vehicle-mounted peripherals)

24V system voltage reduction, 12V to low-voltage conversion (3.3V/1.8V/1.2V, etc.)

Security, IoT modules, and motor control board power supply.

For technical and business advice, please contact: 182778968089