Rainbow-electronics MAX8707 Manual do Utilizador descarregar pdf (Página 25)

MAX8707

Multiphase, Fixed-Frequency Controller for

AMD Hammer CPU Core Power Supplies

______________________________________________________________________________________ 25

SUS

VROK

INTERNAL

PWM CONTROL

DRSKP

FORCED-PWM

AUTO 1-PHASE SKIP

PWM1

PWM2

PWM3

PWM4

NOTE: OVP CONSTANTLY TRACKS THE INTERNAL TARGET, AND THE INTEGRATOR (CCV) IS CONSTANTLY ENABLED.

CPU CORE

VOLTAGE

SUSV

VID

FORCED-PWM

HIGH-Z

LOW THRESHOLD ONLY

HIGH-Z

BLANK

20µs typ

BLANK

20µs typ

Figure 4. Suspend Transition in Forced-PWM Mode (SKIP = low)

SKIP = SUS

VROK

INTERNAL

PWM CONTROL

DRSKP

1-PHASE SKIP FORCED PWM

PWM1

PWM2

PWM3

PWM4

OVP/CCV

CPU CORE

VOLTAGE

SUSV

VID

BLANK

20µs

BLANK

20µs

ACTUAL V

OUT

TARGET

OVP = 1.8V INTEGRATOR DISABLED

OVP TRACKS INTERNAL TARGET

INTEGRATOR ENABLED

LOW VROK THRESHOLD ONLY

HIGH-Z

Figure 5. Suspend Transition in Pulse-Skipping Operation (SKIP = SUS)

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 36 37

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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