General Description

The RT8207L/M provides a complete power supply for both DDRII/DDRIII/Low-Power DDRIII/DDRIV memory systems. It integrates a synchronous PWM buck controller with a 1.5A sink/source tracking linear regulator and buffered low noise reference.

特性 Features

● PWM Controller

? Resistor Programmable Current Limit by Low Side

RDS(ON) Sense

? Quick Load Step Response Within 100ns

? 1 VVDDQ Accuracy Over Line and Load

? Fixed 1.8V (DDRII), 1.5V (DDRIII) or Adjustable

0.75V to 3.3V Output Range for 1.35V (Low-Power

DDRIII) and 1.2V (DDRIV)

? 4.5V to 26V Battery Input Range

? Resistor Programmable Frequency

? Over/Under Voltage Protection

? Internal Current Limit Ramp Soft-Start

? Drives Large Synchronous-Rectifier FETs

? Power Good Indicator

● 1.5A LDO (VTT), Buffered Reference (VTTREF)

? Capable to Sink and Source 1.5A

? External Input Available to Minimize Power Losses

? Integrated Divider Tracks 1/2 VDDQ for Both VTT

and VTTREF

? Buffered Low Noise 10mA VTTREF Output

? Remote Sensing (VTTSNS)

? ±20mV Accuracy for Both VTTREF and VTT

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

● RoHS Compliant and Halogen Free

Applications

● DDRI/II/III/Low-Power DDRIII/DDRIV Memory Power Supplies

● Notebook Computers

● SSTL18, SSTL15 and HSTL Bus Termination