Monolithic Power Systems (MPS) MP4312 Synchronous Step-Down Converters
Monolithic Power Systems (MPS) MP4312 Synchronous Step-Down Converters offer integrated internal high-side and low-side power MOSFETs (HS-FET and LS-FET). The MP4312 allows up to 2A of highly efficient output current (IOUT) with current mode control for fast loop response.
The MPS MP4312 synchronous step-down converters provide a wide 3.3V to 45V input voltage (VIN) range, enabling various step-down applications in automotive input environments. The device implements a 1.7μA shutdown current (ISD) for battery-powered applications. A high power conversion efficiency across a wide load range is accomplished by scaling down the switching frequency (fSW) under light-load conditions to decrease the switching and gate driver losses. Furthermore, an open-drain power good (PG) signal indicates whether the output is within 95% to 105% of its nominal voltage.
The frequency foldback prevention keeps the inductor current (IL) from running away during start-up, and thermal shutdown delivers reliable fault-tolerant operation. High-duty cycle and low-dropout mode are equipped for automotive cold-crank conditions.
The MP4312 converters are housed in a QFN-20 (4mm x 4mm) package.
Features
- Wide 3.3V to 45V Operating Input Voltage (VIN) range
- 2A Continuous Output Current (IOUT)
- 1.7μA Low Shutdown Current (ISD)
- 18μA Sleep Mode Quiescent Current (IQ)
- Internal 48mΩ/20mΩ High-Side and Low-Side MOSFETs (HS-FET and LS-FET)
- 350kHz to 1000kHz Configurable Switching Frequency (fSW) for car battery applications
- Can be synchronized to an external clock
- Out-of-Phase synchronized clock output
- Frequency Spread Spectrum (FSS) for low EMI
- Symmetric VIN for low EMI
- Power Good (PG) output
- External Soft Start (SS)
- 100ns Minimum On Time (tON_MIN)
- Selectable Advanced Asynchronous Modulation (AAM) Mode or Forced Continuous Conduction Mode (FCCM)
- Low-Dropout (LDO) Mode
- Over-Current Protection (OCP) with hiccup mode
- Available in a QFN-20 (4mm x 4mm) package
- Available in a wettable flank package
Applications
- Radios
- Battery-powered systems
- General-purpose consumer applications
- Industrial power systems
Typical Application
