ST PM6691 User Manual

PM6691

Single phase controller for Intel MVP7 GPU and CPU power supply

Data brief

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

■

CkCOT (clocked constant on time control loop)

SENSE

allows almost fixed pwm switching frequency

■ Output voltage ripple compensation

■ Tunable overshoot threshold (TOT) allows to

reduce overshoot in load transient

■ Skip mode allows to increase efficiency at light

load

■ Average and cycle by cycle OCP for each

phase

■ Embedded gate drivers and bootstrap diodes

■ Adjustable VID transitions feature

Applications

■ Intel

Table 1. Device summary

®

mobile CPU and GPU core IMVP7

Order codes Package Packaging

PM6691

PM6691TR Tape and reel

QFN28 - 4x4

(exposed pad)

Tr ay

Description

The PM6691 is a single phase step-down
switching controller with embedded gate drivers. It
has been designed to supply the CPU and GPU
of the Intel
INTEL MVP7 specifications.

The controller is based on clocked constant on­time (CkCOT) architecture that allows nearly
constant switching frequency over load.

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. One
NTC 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 and quiescent current
make the PM6691 a very flexible and cost­effective solution for IMVP7 CPU power supply.

®

mobile platform, according with

QFN28 - 4x4

(exposed pad)

March 2011 Doc ID 018639 Rev 1 1/3

For further information contact your local STMicroelectronics sales office.

www.st.com

3

Revision history PM6691

Revision history

Table 2. Document revision history

Date Revision Changes

24-Mar-2011 1 Initial release

2/3 Doc ID 018639 Rev 1