Rainbow-electronics MAX8707 Manual do Utilizador descarregar pdf (Página 20)

MAX8707

Multiphase, Fixed-Frequency Controller for

AMD Hammer CPU Core Power Supplies

20 ______________________________________________________________________________________

Figure 2. MAX8707 Functional Diagram

MAX8707

R-TO-I

CONVERTER

TRC

M(VPS)

M(TRC)

CRSP

CRSN

ILIM(PK)

R-TO-I

CONVERTER

VPS

DROOP

CCV

LOAD-TRANSIENT

DETECT COMPARATOR

TRAN

SUSV

DAC

TARGET

FAULT

(UVP + THERMAL)

VROK

PGOOD AND

FAULT DETECT

CSN_

CSP_

ERROR

AMP

SUS

UVLO

REFOK

RUN

REF

GND

REF

(2.0V)

FAULT

DECODER

REF

TRC

CLAMP

ILIM(AVE)

CURRENT-

LIMIT

COMPARATOR

25mV

160

REF

CHANGE

A = 10

PHASE ENABLE

DETECT

EA[4:1]

PWM_

PGND

4-PHASE

FIXED-FREQ

CURRENT-MODE

PWM LOGIC

SUS

SKIP

DRSKP

RUN

SLEW

TARGET

WINDOW

COMPARATOR

CHANGE

OSC

OSCILLATOR

FBS

x 4

GNDS

OFS

TIME

TARGET

SUS

x 4

INTEGRATOR

AMP

VPS

500k

Ω

SKIP

SHDN

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 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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