Dual 5V Synchronous Buck Pulse-Width Modulator (PWM) Controller For DDRAM Memory VDDQ And VTT Termination

The ISL6531 provides complete control and protection for dual DC-DC Converters optimized for high-performance DDRAM memory applications. It is designed to drive low cost N-Channel MOSFETs in synchronous-rectified buck topology to efficiently generate 2.5V VDDQ for powering DDRAM memory, VREF for DDRAM differential signalling, and VTT for signal termination. The ISL6531 integrates all of the control, output adjustment, monitoring and protection functions into a single package.
The VDDQ output of the converter is maintained at 2.5V through an integrated precision Voltage Reference The VREF output is precisely regulated to 1/2 the memory power supply, with a maximum tolerance of 1% over temperature and line voltage variations. VTT accurately tracks VREF. During V2_SD sleep mode, the VTT output is maintained by a low power window Regulator
The ISL6531 provides simple, single feedback loop, voltagemode control with fast transient response for the VDDQ Regulator The VTT Regulator features internal compensation that eases the design. It includes two phase-locked 300kHz triangle-wave Oscillators which are displaced 90o to minimize interference between the two PWM Regulators The Regulators feature error Amplifiers with a 15MHz gainbandwidth product and 6V/s slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty ratio ranges from 0% to 100%.
The ISL6531 protects against overcurrent conditions by inhibiting PWM operation. The ISL6531 monitors the current in the VDDQ Regulator by using the rDS(ON) of the upper MOSFET which eliminates the need for a current sensing resistor.
By Intersil Corporation
Part Manufacturer Description Datasheet Samples
ISL6531CR Rochester Electronics LLC Dual Switching Controller, Voltage-mode, 325kHz Switching Freq-Max, PQCC32, 5 X 5 MM, PLASTIC, MO-220-VHHD-2, MLFP-32
ISL6531CB Rochester Electronics LLC Dual 5V Synchronous Buck Pulse-Width Modulator (PWM) Controller
ISL6531 's PackagesISL6531 's pdf datasheet

ISL6531 Pinout, Pinouts
ISL6531 pinout,Pin out
This is one package pinout of ISL6531,If you need more pinouts please download ISL6531's pdf datasheet.

ISL6531 Application circuits
ISL6531 circuits
This is one application circuit of ISL6531,If you need more circuits,please download ISL6531's pdf datasheet.

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