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MP4312
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Description
The MP4312 is a configurable-frequency, synchronous step-down switching converter with integrated internal high-side and low-side power MOSFETs (HS-FET and LS-FET, respectively). It provides up to 2A of highly efficient output current (IOUT) with current mode control for fast loop response.
The wide 3.3V to 45V input voltage (VIN) range accommodates a variety of step-down applications in automotive input environments. A 1.7μA shutdown current (ISD) allows the device to be used in battery-powered applications.
High power conversion efficiency across a wide load range is achieved by scaling down the switching frequency (fSW) under light-load conditions to reduce the switching and gate driver losses. An open-drain power good (PG) signal indicates whether the output is within 95% to 105% of its nominal voltage.
Frequency foldback helps prevent inductor current (IL) runaway during start-up. Thermal shutdown provides reliable, fault-tolerant operation. A high duty cycle and low-dropout mode are provided for automotive cold-crank conditions.
The MP4312 is available in a QFN-20 (4mmx4mm) package.
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Features & Benefits
- 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 (4mmx4mm) Package
- Available in a Wettable Flank Package
Active Part Numbers:
MP4312GRE-Z MP4312GRE-P
Part numbers ending in P and Z are the same parts. P and Z only indicates reel size.
Meaning of P & Z
MP4312 Resources
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ARTICLE
DESIGNING THE FEEDBACK VOLTAGE RESISTOR DIVIDER IN A DC/DC CONVERTERARTICLEThe specifications of the feedback (FB) voltage resistor divider in DC-DC converters often poses various design challenges, such as determining the required resistance or adjusting parameters (e.g. output voltage, upper divider resistance or lower divider resistance). Figure 1 shows the various magnitude combinations for the FB upper and lower divider resistances. This article examines the ...
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ARTICLE
EVALUATING THE TRANSIENT PERFORMANCE OF BUCK REGULATORS WITH AN INTEGRATED COMPENSATION NETWORKARTICLEDesigning the compensation network for buck regulators can be tedious and may require several iterations to optimize the solution. Having an optimized control loop, which can enable fast transient response while maintaining proper stability, has become a major challenge with the emergence of new applications such as ADAS and fast transient response requirements. To address these issues, buck regul...
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ARTICLE
SWITCH NODE LAYOUT CONSIDERATIONS FOR EMCARTICLEThe switch node of a switching regulator or power converter circuit is a critical conduction path that requires special attention when designing the PCB layout. This circuit node is where one or more power semiconductor switches (such as a MOSFET or diode) connect to a magnetic energy-storing device (such as an inductor or transformer winding). The switching signals of this circuit node contain fa...
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ARTICLE
QUICK TIPS TO DIAGNOSE AND STABILIZE AN UNSTABLE SWITCHING POWER SUPPLYARTICLEAn unstable power supply can cause severe system issues, such as audible noise from the passive components, unexpected jittering in the switching frequency, extreme oscillations on the output voltage during load transient events, and failures in the semiconductor switches. While there are various reasons for instability, an un-tuned compensation network accounts for majority of instability issues ...
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ARTICLE
USING EXTERNAL KNOBS TO IMPROVE TRANSIENT PERFORMANCE OF BUCK REGULATORS WITH AN INTEGRATED COMPENSATION NETWORKARTICLEThe high power density requirement and board-level space constraints in modern applications — such as lighting, ADAS, and USB — call for higher integration in buck regulators. There is a trend to integrate MOSFETs and compensation networks inside the chip. This integration of the compensation network’s passive components saves cost, board space, and design iterations. However, it...
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REFERENCE DESIGN
E-TRACKER REFERENCE DESIGNREFERENCE DESIGNTracking the location of different types of vehicles is an increasingly popular application for multiple purposes, such as control of transport trucks or anti-theft security. However, this presents two challenges in electronic design. First, the system must be able to track a vehicle’s location when the car battery is turned off. Second, the GSM modules that establish communication with the ...
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REFERENCE DESIGN
USB-C CHARGE-THRU DONGLE WITH HDMI (LOW COST)REFERENCE DESIGNCharge-Through Dongle solution enables connectivity between a USB Type-C Notebook and HDMI Display, legacy USB device and Gigabit Ethernet while also connecting a USB Type-C charging cable. The Charge-Through Dongle solution allows simultaneous HDMI display, Superspeed data transfers, Ethernet connection and charging USB Type-C Notebook. The MPS components on these reference designs are careful...
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