ST PM6691 User Manual
PM6691
Single phase controller for Intel MVP7 GPU and 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 RSENSE
■CkCOT (clocked constant on time control loop) 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® mobile CPU and GPU core IMVP7
Table 1. |
Device summary |
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Order codes |
Package |
Packaging |
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PM6691 |
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QFN28 - 4x4 |
Tray |
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PM6691TR |
(exposed pad) |
Tape and reel |
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Data brief
QFN28 - 4x4 (exposed pad)
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® mobile platform, according with 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.
March 2011 |
Doc ID 018639 Rev 1 |
1/3 |
For further information contact your local STMicroelectronics sales office. |
www.st.com |
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Revision history |
PM6691 |
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Revision history
Table 2. |
Document revision history |
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Date |
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Revision |
Changes |
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24-Mar-2011 |
1 |
Initial release |
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2/3 |
Doc ID 018639 Rev 1 |
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