AN2798 datasheet(1/38 Pages) STMICROELECTRONICS

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AN2798 Datasheet(PDF) 1 Page - STMicroelectronics

Part #	AN2798

Description	Complete DDR2/3 memory power supply

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 38 page

November 2008

Rev 1

1/38

AN2798

Application note

Complete DDR2/3 memory power supply

controller based on the PM6670AS

Introduction

The PM6670AS device is a complete DDR2/3 power supply regulator for portable

applications designed to meet JEDEC specifications. It integrates a constant on-time (COT)

buck controller, a 2 A peak sink/source low dropout regulator and a 15 mA low-noise

buffered reference.

The COT architecture assures fast transient response supporting both polymeric and

ceramic output capacitors. An embedded integrator control loop compensates the DC

voltage error due to the output ripple. The 2 A peak sink/source linear regulator provides the

memory termination voltage with fast load transient response.

The device is fully compliant with system sleep states S3 and S4/S5, setting the LDO output

to high impedance in suspend-to-RAM state and performing the tracking discharge of all

outputs in suspend-to-disk state.

Figure 1.

PM6670AS demonstration board

www.st.com

Manufacturer	Part #	Datasheet	Description
Silicon Laboratories	AN279	346Kb / 8P	ESTIMATING PERIOD JITTER FROM PHASE NOISE
STMicroelectronics	AN279	117Kb / 5P	output to output short-circuit
	AN2791	659Kb / 18P	This document describes a detailed analysis on the current regulated channels
	AN2792	135Kb / 12P	STM8A easy programmer
	AN2794	3Mb / 39P	This application note provides design guidelines

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	PM6670S	717Kb / 53P	Complete DDR2/3 memory power supply controller
	PM6670	682Kb / 53P	Complete DDR2/3 memory power supply controller
	PM6670AS	717Kb / 54P	Complete DDR2/3 memory power supplies controller
	STEVAL-ISA051V1	152Kb / 4P	Complete DDR2/3 memory power supply controller evaluation board based on the PM6670S
Semtech Corporation	SC488	806Kb / 24P	Complete DDR1/2/3 Memory Power Supply
	SC480	846Kb / 25P	Complete DDR1/2/3 Memory Power Supply
	SC486	369Kb / 26P	Complete DDR1/2/3 Memory Power Supply
Maxim Integrated Produc...	MAX17000A	755Kb / 32P	Complete DDR2 and DDR3 Memory Power-Management Solution Rev 3; 4/13
	MAX17000	757Kb / 32P	Complete DDR2 and DDR3 Memory Power-Management Solution Rev 1; 2/11
	MAX17000A	804Kb / 32P	Complete DDR2 and DDR3 Memory Power-Management Solution Rev 2; 11/10

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