General Description

The RT8207 provides a complete power supply for both DDRII/DDRIII memory systems. It integrates a synchronous PWM buck controller with a 3A sink/source tracking linear regulator and a buffered low noise reference.

Features

 PWM Controller

   ` Resistor Programmable Current Limit by Low-Side RDS(ON) Sense

   ` Quick Load-Step Response within 100ns

   ` 1% VOUT Accuracy Over Line and Load

   ` Fixed 1.8V (DDRII), 1.5V (DDRIII) or Adjustable 0.75V to 3.3V Output Range

   ` Battery Input Range 2.5V to 26V

   ` Resistor Programmable Frequency

   ` Over/Under Voltage Protection

   ` 4 Steps Current Limit During Soft-Start

   ` Drives Large Synchronous-Rectifier FETs

   ` Power-Good Indicator

 3A LDO (VTT), Buffered Reference (VTTREF)

   ` Capable to Sink and Source Up to 3A

   ` LDO Input Available to Optimize Power Losses

   ` Requires Only 20μF Ceramic Output Capacitor

   ` Buffered Low Noise 10mA VTTREF Output

   ` Accuracy ±20mV for Both VTTREF and VTT

   ` Supports High-Z in S3 and Soft-Off in S4/S5

 RoHS Compliant and Halogen Free

Applications

DDRII/DDRIII Memory Power Supplies

Notebook Computers

SSTL18, SSTL15 and HSTL Bus Termination