Rainbow-electronics MAX8707 Bedienungsanleitung PDF herunterladen (Seite 21)

MAX8707

Multiphase, Fixed-Frequency Controller for

AMD Hammer CPU Core Power Supplies

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MANUFACTURER WEBSITE

BI Technologies www.bitechnologies.com

Central Semiconductor www.centralsemi.com

Coilcraft www.coilcraft.com

Coiltronics www.coiltronics.com

Fairchild Semiconductor www.fairchildsemi.com

International Rectifier www.irf.com

Kemet www.kemet.com

Panasonic www.panasonic.com

Sanyo www.secc.co.jp

Siliconix (Vishay) www.vishay.com

Sumida www.sumida.com

Taiyo Yuden www.t-yuden.com

TDK www.component.tdk.com

TOKO www.tokoam.com

Table 2. Component Suppliers

SHDN SUS SKIP OFS

OUTPUT

VOLTAGE

OPERATING MODE

GND X X X GND

Low-Power Shutdown Mode. PWM_ outputs are forced low,

and the controller is disabled. The supply current drops to

10µA (max).

GND GND

GND or REF

D0–D4

(no offset)

Normal Operation. The no-load output voltage is determined

by the selected VID DAC code (D0–D4, Table 4).

GND V

GND or REF

D0–D4

(no offset)

Pulse-Skipping Operation. When SKIP is pulled high, the

MAX8707 immediately enters pulse-skipping operation

allowing automatic PWM/PFM switchover under light loads.

The VROK upper threshold is blanked.

GND X

0 to 0.8V

1.2V to 2.0V

D0–D4

(plus offset)

Deep-Sleep Mode. The no-load output voltage is determined

by the selected VID-DAC code (D0–D4, Table 4) plus the

offset voltage set by OFS.

SUSV

(no offset)

Suspend Mode/One Phase Skip. The no-load output voltage

is determined by the suspend voltage present on SUSV,

overriding all other active modes of operation.

X X X GND

Fault Mode. The fault latch has been set by either UVP or

thermal shutdown. The controller remains in FAULT mode

until V

power is cycled or SHDN toggled.

Table 3. Operating-Mode Truth Table

X = Don’t Care

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 36 37

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