PM8908TR datasheet(1/28 Pages) STMICROELECTRONICS

Part #	PM8908TR

Description	Monolithic buck converter for DDR memory termination

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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This is information on a product in full production.

November 2015

DocID027688 Rev 3

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PM8908

Monolithic buck converter for DDR memory termination

Datasheet

- production data

Features

 Integrated MOSFETs for high efficiency

 Current COT architecture

 1 V to 3.5 V input voltage (V

IN)

 5.0 V supply voltage (V

CC)

 Constant frequency mode

 1% output voltage accuracy

 Two programmable switching frequencies

(0.6 MHz or 1 MHz)

 ADJ output voltage from 0.5 V to 2 V

 Embedded bootstrap diode

 OV/UV/OC and overtemperature protection

 Soft-off with integrated discharge resistor

 External tracking

 Power Good output

 QFN20 3.5 x 4.0 mm compact package

Applications

 Memory termination regulator for DDR3, DDR4

and low power DDR3/DDR4

 Notebook/desktop/server

 Low voltage application for 1 V to 3.5 V input

rails

Description

The PM8908 is a high efficiency monolithic step-

down switching regulator designed mainly for the

DDR termination.

The IC operates from 1 V to 3.5 V input voltage

(VIN).

The device uses a COT control loop that provides

very good performances in terms of load and line

transients. The current sense is internally

thermally compensated for optimum precision.

The output voltage is adjusted from 0.5 V to 2 V

with ± 1% accuracy overtemperature variations.

The PM8908 also provides external tracking

support.

The PM8908 provides positive and negative

overcurrent protection as well as

over/undervoltage and overtemperature

protection. PGOOD output easily provides real-

time information on the output voltage.

The PM8908 is available in a QFN20

3.5 x 4.0 mm package.

QFN20 3.5 x 4.0 mm

Table 1. Device summary

Order code

Package

Packaging

PM8908TR

QFN20 (3.5 x 4.0 mm)

Tape and reel

www.st.com

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