Datasheet4U Logo Datasheet4U.com

RT6551A - Complete DDR Memory Power Supply Controller

General Description

The RT6551A/B provides a complete power supply for DDR2/DDR3/DDR3L/LPDDR3/DDR4 memory systems.

It integrates a synchronous PWM Buck controller with a 1.5A sink/source tracking linear regulator and buffered low noise reference.

Key Features

  • PWM Controller  Adjustable Current Limit with Low-Side RDS(ON) Sensing  Low Quiescent Supply Current  Quick Load-Step Response within 100ns  1% VVDDQ Accuracy Over Line and Load  Adjustable 0.675V to 3.3V Output Range for 1.8V (DDR2), 1.5V (DDR3), 1.35V (DDR3L), 1.2V (LPDDR3) and 1.2V (DDR4)  4.5V to 26V Battery Input Range  Resistor Adjustable Frequency  Over-/Under-Voltage Protection  Internal Voltage Ramp Soft-Start  Drives Large Synchronous Rectifier MOSFETs  Power Good Indi.

📥 Download Datasheet

Datasheet Details

Part number RT6551A
Manufacturer Richtek
File Size 284.16 KB
Description Complete DDR Memory Power Supply Controller
Datasheet download datasheet RT6551A Datasheet

Other Datasheets by Richtek

Part Number Description
RT6551B Complete DDR Memory Power Supply Controller
RT6515 10-Bit Programmable Gamma Reference
RT6541A High Efficiency Single Synchronous Buck PWM Controller
RT6541D High Efficiency Single Synchronous Buck PWM Controller
RT6541E High Efficiency Single Synchronous Buck PWM Controller
RT6542A High Efficiency Single Synchronous Buck PWM Controller
RT6543A High Efficiency Single Synchronous Buck PWM Controller
RT6543B High Efficiency Single Synchronous Buck PWM Controller
RT6545A Dual-Channel Synchronous DC/DC Step-Down Controller
RT6545B Dual-Channel Synchronous DC/DC Step-Down Controller

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
® RT6551A/B Complete DDR Memory Power Supply Controller General Description The RT6551A/B provides a complete power supply for DDR2/DDR3/DDR3L/LPDDR3/DDR4 memory systems. It integrates a synchronous PWM Buck controller with a 1.5A sink/source tracking linear regulator and buffered low noise reference. The PWM controller provides the low quiescent current, high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high-voltage batteries to generate low-voltage chipset RAM supplies in notebook computers. The constant on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency.