ST PM6690 User Manual
Data brief
For further information contact your local STMicroelectronics sales office.
March 2011 Doc ID 018638 Rev 1 1/3
3
PM6690
Three phase controller for Intel MVP7 CPU power supply
Features
■ 4.5 V to 28 V input voltage range
■ 0.25 V to 1.52 V output voltage range, 8 bit
SVID
■ IMVP7 spec compliant
■ Selectable PWM switching frequency,
maximum temperature, maximum currents,
boot voltage, VID transitions slew rate slow
■ Adjustable load line (LL), 1 NTC needed for LL
thermal compensation
■ Lossless current sense with inductor DCR or
accurate inductor current sense with R
SENSE
■
CkCOT (clocked constant on time control loop)
allows almost fixed pwm switching frequency
■ Output voltage ripple compensation
■ Phases overlap in load transient
■ Tunable overshoot threshold (TOT) allows to
reduce overshoot in load transient
■ Skip mode allows to increase efficiency at light
load
■ Average OCP for all phases and cycle by cycle
OCP for each phase
■ Embedded gate drivers and bootstrap diodes
■ Adjustable VID transitions feature
Applications
■ Intel mobile
®
CPU core IMVP7
Description
The PM6690 is a three phase step-down
switching controller with embedded gate drivers. It
has been designed to supply the CPU of the
Intel
®
mobile platform, according with INTEL
MVP7 specifications.
The controller is based on clocked constant on-
time (CkCOT) architecture that allows nearly
constant switching frequency over load. The
controller ensures 120° phase shift PWM
operation when all the 3 phases are enabled.
An embedded integrator control loop
compensates the DC voltage error due to the
output voltage ripple. Load line of the output
voltage can be adjusted by setting a resistor
divider and it can be thermally compensated by
using 1 NTC.
Current monitor IMON provides an analog output
current proportional to the CPU load current.
1NTC can be used to sense the maximum
temperature of the switching regulator and
provide the temperature information to the CPU
through SVID bus.
Adjustable VID transitions feature, TOT feature,
extremely low shutdown current and quiescent
current make the PM6690 a very flexible and
cost-effective solution for IMVP7 CPU power
supply.
Table 1. Device summary
Order codes Package Packaging
PM6690
QFN48 - 6x6
(exposed pad)
Tr ay
PM6690TR Tape and reel
QFN-48
(7 x 7 mm)
QFN48 - 6x6
(exposed pad)
www.st.com
Revision history PM6690
2/3 Doc ID 018638 Rev 1
Revision history
Table 2. Document revision history
Date Revision Changes
29-Mar-2011 1 Initial release
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