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PM8908TR Datasheet

Monolithic buck converter

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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 (VIN)
5.0 V supply voltage (VCC)
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
(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.
Order code
PM8908TR
Table 1. Device summary
Package
QFN20 (3.5 x 4.0 mm)
Packaging
Tape and reel
July 2017
This is information on a product in full production.
DocID027688 Rev 4
1/28
www.st.com


STMicroelectronics Electronic Components Datasheet

PM8908TR Datasheet

Monolithic buck converter

No Preview Available !

Contents
Contents
PM8908
1
Typical application circuit and block diagram . . . . . . . . . . . . . . . . . . . . 4
1.1 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Pin description and connection diagrams . . . . . . . . . . . . . . . . . . . . . . . 6
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5
Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1 Power section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2 Device configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3 Startup and shutdown management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Soft-off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.4 Output voltage monitoring and protection . . . . . . . . . . . . . . . . . . . . . . . . 16
5.4.1 Overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.4.2 Undervoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.4.3 Power Good (PGOOD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.4.4 Overcurrent protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.4.5 Overtemperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.1 Output voltage setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2 Droop setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.3 Non-droop setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.4 Inductor design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.5 Output capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.6 Input capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.7 Compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2/28
DocID027688 Rev 4


Part Number PM8908TR
Description Monolithic buck converter
Maker STMicroelectronics
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PM8908TR Datasheet PDF






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