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