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NCP5214A
2-in-1 Notebook DDR Power Controller
NCP5214A
2−in−1 Notebook DDR
Power Controller
The NCP5214A 2−in−1 Notebook DDR Power Controller is
specifically designed as a total power solution for notebook DDR
memory system. This IC combines the efficiency of a PWM
controller for the VDDQ supply with the simplicity of linear
regulators for the VTT termination voltage and the buffered low
noise reference. This IC contains a synchronous PWM buck
controller for driving two external NFETs to form the DDR memory
supply voltage (VDDQ). The DDR memory termination regulator
output voltage (VTT) and the buffered VREF are internally set to
track at the half of VDDQ. An internal power good voltage monitor
tracks VDDQ output and notifies the user whether the VDDQ output
is within target range. Protective features include soft−start
circuitries, undervoltage monitoring of supply voltage, VDDQ
overcurrent protection, VDDQ overvoltage and undervoltage
protections, and thermal shutdown. The IC is packaged in DFN22.
Features Incorporates VDDQ, VTT Regulator, Buffered VREF Adjustable VDDQ Output VTT and VREF Track VDDQ/2 Operates from Single 5.0 V Supply Supports VDDQ Conversion Rails from 4.5 V to 24 V Power−saving Mode for High Efficiency at Light Load Integrated Power FETs with VTT Regulator Sourcing/Sinking
1.5 A DC and 2.4 A Peak Current Requires Only 20 �F Ceramic Output Capacitor for VTT Buffered Low Noise 15 mA VREF Output All External Power MOSFETs are N−channel <5.0 �A Current Consumption During Shutdown Fixed Switching Frequency of 400 kHz Soft−start Protection for VDDQ and VTT Undervoltage Monitor of Supply Voltage Overvoltage Protection and Undervoltage Protection for VDDQ Short−circuit Protection for VDDQ and VTT Thermal Shutdown Housed in DFN22 This is a Pb−Free Device
Typical Applications Notebook DDR/DDR2 Memory Supply and Termination V oltage Active Termination Busses (SSTL−18, SSTL−2, SSTL−3)
