PM6670STR データシートの表示（PDF） - STMicroelectronics

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PM6670STR

Complete DDR2/3 memory power supply controller

STMicroelectronics 

PM6670S

Complete DDR2/3 memory power supply controller

Features

■ Switching section (VDDQ)

– 4.5 V to 28 V input voltage range

– 0.9 V, ±1 % voltage reference

– 1.8 V (DDR2) or 1.5 V (DDR3) fixed output

voltages

– 0.9 V to 2.6 V adjustable output voltage

– 1.237 V ±1 % reference voltage available

– Very fast load transient response using

constant on-time control loop

– No RSENSE current sensing using low side

MOSFET’s RDS(ON)

– Negative current limit

– Latched OVP and UVP

– Soft-start internally fixed at 3 ms

– Selectable pulse skipping at light load

– Selectable no-audible (33 kHz) pulse skip

mode

– Ceramic output capacitors supported

– Output voltage ripple compensation

■ VTT LDO and VTTREF

– 2 Apk LDO with foldback for VTT

– Remote VTT sensing

– High-Z VTT output in S3

– Ceramic output capacitors supported

– ±15 mA low noise buffered reference

Applications

■ DDR2/3 memory supply

■ Notebook computers

■ Handheld and PDAs

■ CPU and chipset I/O supplies

■ SSTL18, SSTL15 and HSTL bus termination

VFQFPN-24 4x4

Description

The device PM6670S is a complete DDR2/3

power supply regulator designed to meet JEDEC

specifications.

It integrates a constant on-time (COT) buck

controller, a 2 Apk sink/source low drop out

regulator and a 15 mA low noise buffered

reference.

The COT architecture assures fast transient

response supporting both electrolytic and ceramic

output capacitors. An embedded integrator

control loop compensates the DC voltage error

due to the output ripple.

The 2 Apk 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, providing LDO output high

impedance in suspend-to-RAM and tracking

discharge of all outputs in suspend-to-disk.

Table 1. Device summary

Order code

Package

Packaging

PM6670S VFQFPN-24 4x4

Tube

PM6670STR (Exposed pad) Tape and reel

February 2010

Doc ID 14432 Rev 4

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www.st.com

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