PM8908 Datasheet, PDF (1/28 Pages) STMicroelectronics – Monolithic buck converter for DDR memory termination

PM8908
Monolithic buck converter for DDR memory termination
Datasheet - production data
QFN20 3.5 x 4.0 mm
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
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
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
(V_IN).
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.
Order code
PM8908TR
Table 1. Device summary
Package
QFN20 (3.5 x 4.0 mm)
Packaging
Tape and reel
November 2015
This is information on a product in full production.
DocID027688 Rev 3
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