Global Mixed-mode Technology
G5616
Complete DDR, DDRII and DDRIII Memory Solution
Synchronous Buck PWM Controller, 3A...
Global Mixed-mode Technology
G5616
Complete DDR, DDRII and DDRIII Memory Solution
Synchronous Buck PWM Controller, 3A LDO,
Buffered Reference
Features Synchronous Buck Controller (VDDQ)
Ultra-High Efficiency No Current-Sense Resistor (Lossless ILIMIT) Quasi-PWM with 100ns Load-Step Response 1.8V(DDRII) /1.5V(DDRIII) Fixed or Adjustable
to 2.5V(DDR) or 0.75V to 3.6V Adjustable Output Range 2V to 24V Battery Input Range 400kHz Switching Frequency OVP & UVP of VDDQ Output Drives Large Synchronous-Rectifier FETs Power-Good Indicator
3-A LDO (VTT), Buffered Reference (VTTREF)
Support DDR (1.25 VTT) , DDR II (0.9 VTT) and DDRIII(0.75 VTT) Requirements
VLDOIN Voltage Range: 1.2V to 3.6V Requires Only 20µF Ceramic VTT Output Ca-
pacitance Supports High-Z in S3 and Soft-Off in S5 Integrated Divider Tracks 1/2 VDDQSNS for
Both VTT and VTTREF Remote Sensing (VTTSNS) ±20mV Accuracy for VTT and VTTREF 10mA Buffered Reference (VTTREF) Built-In Soft-Start to Reduce the VLDOIN Surg-
ing Current Over Current Protection of VTT Output Thermal Shutdown Protection
Applications
Notebook Computers CPU Core Supply Chipset/RAM Supply as Low as 0.75V 1.8V and 2.5V I/O Supply
General Description
The G5616 is intended for DDR/SSTL-2, DDRII/SSTL-18 and DDRIII memory systems. It integrates a synchronous buck PWM controller with a 3-A sink-source linear
regulator and buffered reference.
The PWM controller uses constant on-time control scheme to handle...