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Monolithic Power Systems MP9943
High Efficiency 3A Peak, 36V, Synchronous Step-Down Converter With Power Good
Overview
| Topology | Buck Converter |
| Input voltage | 12 V |
| Switching frequency | 320-500 kHz |
| Output 1 | 3.3 V / 3 A |
| Output 2 | 5 V / 3 A |
| IC revision | 1.0 |
Description
The MP9943 is a high-frequency, synchronous, rectified, step-down, switch-mode converter with built-in power MOSFETs. It offers a very compact solution to achieve a 3A peak output current with excellent load and line regulation over a wide input supply range. The MP9943 has synchronous mode operation for higher efficiency over the output current load range.
Current-mode operation provides fast transient response and eases loop stabilization.
Full protection features include over-current protection and thermal shutdown.
The MP9943 requires a minimal number of readily-available standard external components, and is available in a space-saving QFN-8 (3mmx3mm) package
Features
- -Wide 4V to 30V Continuous Operating Input Range
- -36V Input Transient Tolerance
- -85mΩ/55mΩ Low RDS(ON) Internal Power MOSFETs
- -High-Efficiency Synchronous Mode Operation
- -410kHz Switching Frequency
- -Synchronizes from 200kHz to 2.2MHz External Clock
- -High Duty Cycle for Automotive Cold-crank
- -Internal Power-Save Mode
- -Internal Soft-Start
- -Power Good Indicator
- -Over Current Protection and Hiccup
- -Thermal Shutdown
- -Output Adjustable from 0.8V
- -Available in an QFN-8 (3mmx3mm) package
Typical applications
- •General Consumer
- Distributed Power Systems
- •Multi-Function Printers (MFP)