MP9943GQ-Z American Core Source (MPS) synchronous buck chip | Industrial grade Buck topology synchronous rectifier 800mV-28.5V output

MP9943GQ-Z is a synchronous buck chip with 36V input and 3A output produced by MPS in the United States. It can fully drive 2W image transmission equipment, but has significant differences in voltage resistance and packaging compared to MP2225, and cannot be directly replaced. ‌‌‌

Core electrical parameters:

Input voltage: Continuous operation from 4V to 36V, capable of withstanding transient voltage of 40V, suitable for 12V and 24V systems.

Output current: peak 3A, continuous output capability meets most medium power devices.

Switching frequency: fixed at 410kHz, supports external clock synchronization (200kHz-2.2MHz).

Output voltage: adjustable from 0.8V to 28.5V, set by external resistor voltage division. ‌‌‌

Package size: QFN-8 (3mm x 3mm) package is used, which is compact in size and suitable for circuit boards with limited space

Temperature range: -40 ℃~+125 ℃ (junction temperature TJ)

Built in MOS Rds (on): High side 85m Ω/Low side 55m Ω

Control mode: current mode PWM, light load power-saving mode PSM

Protection functions: internal soft start, overcurrent OCP hiccup protection, overheat TSD shutdown, undervoltage UVLO

Scope of Application

Industrial control: PLC module, industrial IO board, 24V bus power supply acquisition board, sensor transmitter

Robot: Small mobile robot, gimbal power board, providing power to MCU and motor drive (perfectly matching the previous EFM8BB21+DRV8251 solution)

Car accessories: car auxiliary electronic control, cold start scenario, car peripheral power supply (non automotive grade, ordinary car accessories)

Network and Communication: Gateway, Mini Switch, Security Camera

Medical equipment: Portable medical detection module power supply

Consumer devices: electric tools, water pump controllers .

function and role

1. High voltage to low voltage DC-DC voltage reduction: 4~36V wide input, stabilizing the 24V/12V bus to 5V, 3.3V, 1.8V, etc., to supply power to the main control, sensors, and driver IC

2. Synchronous rectification improves efficiency: Built in upper and lower MOSFETs, compared to diode asynchronous Buck, generate lower heat, and peak efficiency can reach 95%

3. Current mode control: Fast transient response, easy loop stability, and minimal voltage fluctuations during load jumps

4. Enable frequency synchronization: The EN pin can turn on/off the power supply; Support external clock synchronization to reduce system EMI interference

5. Good indication of PG power supply: open leakage output, notify MCU after the output voltage meets the standard for power on timing control

6. Internal soft start: Slowly increase the output voltage when powered on, suppress startup surge current, and protect the backend load

7. Multiple protections: automatic recovery of overcurrent hiccups, overheat shutdown, undervoltage locking; Automatic retry after failure to improve system reliability

8. Light load power-saving mode: reduces switch losses and improves standby efficiency under light loads

For technical and business inquiries, please contact Mr. Zhang at 13430464310