Rainbow-electronics MAX8707 Manual de usuario Pagina 21
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MAX8707
Multiphase, Fixed-Frequency Controller for
AMD Hammer CPU Core Power Supplies
______________________________________________________________________________________ 21
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).
V
CC
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).
V
CC
GND V
CC
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.
V
CC
GND X
0 to 0.8V
or
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.
V
CC
V
CC
XX
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.
V
CC
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
CC
power is cycled or SHDN toggled.
Table 3. Operating-Mode Truth Table
X = Don’t Care
- General Description 1
- Features 1
- Ordering Information 1
- Applications 1
- ABSOLUTE MAXIMUM RATINGS 2
- ELECTRICAL CHARACTERISTICS 2
- -1.5 +1.5 4
- CSP_ - CSN_ 4
- -2 +2 mV 7
- MAX8707 toc22 12
- MAX8707 toc23 12
- MAX8707 toc24 12
- MAX8707 toc25 12
- Pin Description 13
- Pin Description (continued) 14
- Detailed Description 16
- Switching Frequency (OSC) 17
- Table 2. Component Suppliers 21
- Table 5. SKIP Settings 26
- Current Sense 27
- Peak/Average Current Limit 27
- Power-Up Sequence (POR, UVLO) 28
- Shutdown 28
- Fault Protection 29
- Multiphase, Fixed-Frequency 30
- Design Procedure 30
- Current Limit 31
- Output-Capacitor Selection 31
- Input Capacitor Selection 32
- Setting Voltage Positioning 32
- Applications Information 33
- Layout Procedure 35
- Chip Information 36
- Pin Configuration 36
- Package Information 37
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