MP9943GQ Synchronous Buck Converter IC - QFN-8 Package

MP9943GQSynchronous Step Down Converter IC is a high-efficiency synchronous step-down (buck) DC-DC converter designed to deliver up to 3A peak output current with excellent line and load regulation. It operates from a wide 4V to 36V input voltage range and integrates low RDS(ON) power MOSFETs, making it ideal for industrial equipment, distributed power systems, automotive electronics, and embedded applications. The device features synchronous rectification, programmable output voltage from 0.8V, Power Good indication, internal soft-start, and comprehensive protection functions for reliable operation.

MP9943GQ Synchronous Step Down Converter IC Datasheet

Features:

1. Wide 4V to 36V Input Voltage Range
2. 3A Peak Output Current
3. High-Efficiency Synchronous Buck Converter
4. Integrated 85mΩ / 55mΩ Power MOSFETs
5. 410kHz Fixed Switching Frequency
6. External Clock Synchronization (200kHz to 2.2MHz)
7. Adjustable Output Voltage from 0.8V
8. Current Mode Control
9. Internal Power Save Mode (PFM)
10. Integrated Soft-Start
11. Power Good (PG) Output
12. Over Current Protection with Hiccup Mode
13. Thermal Shutdown Protection
14. High Duty Cycle Operation
15. Excellent Line and Load Regulation
16. QFN-8 (3mm × 3mm) Package
17. RoHS Compliant

Specifications:

Parameter	Value
Product Type	Synchronous Buck Converter IC
Part Number	MP9943GQ-Z
Package	QFN-8 (3mm × 3mm)
Input Voltage	4V ~ 36V
Maximum Input Voltage	40V
Output Voltage	Adjustable from 0.8V
Peak Output Current	3A
Switching Frequency	410kHz (Typ.)
Sync Frequency	200kHz ~ 2.2MHz
High-Side MOSFET	85mΩ (Typ.)
Low-Side MOSFET	55mΩ (Typ.)
Feedback Voltage	0.792V (Typ.)
Quiescent Current	0.7mA (Typ.)
Shutdown Current	8µA (Max.)
Soft-Start Time	1.5ms (Typ.)
Current Limit	4.4A (Typ.)
Power Good Output	Yes
Protection Features	OCP, Thermal Shutdown, UVLO
Operating Temperature	-40°C to +125°C
Mounting Type	Surface Mount
RoHS Compliance	Yes

Pin Configuration:

Pin	Name	Description
1	FB	Feedback Input
2	VCC	Bias Supply
3	EN/SYNC	Enable / Clock Synchronization
4	BST	Bootstrap Supply
5	GND	Ground
6	SW	Switching Output
7	IN	Input Supply
8	PG	Power Good Output

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Package Includes:

1 x MP9943GQ Synchronous Step Down Converter IC - QFN-8 Package