MAX8550(2004) Ver la hoja de datos (PDF) - Maxim Integrated

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MAX8550
(Rev.:2004)

Integrated DDR Power-Supply Solutions for Desktops, Notebooks, and Graphic Cards

Maxim Integrated 

Integrated DDR Power-Supply Solutions for

Desktops, Notebooks, and Graphic Cards

IN

tOFF

TRIG

MAX8550/

Q ONE-SHOT

MAX8551

TON

ON-TIME

OUT

COMPUTE

BST

tON

S

TRIG

Q

DH

ONE-SHOT Q

R

LX

INTREF

1.16 x INTREF

S

Q

R

VDD

DL

PGND

OVP/UVP

(N.C. IN MAX8551)

SHDNA

BUCK ON/OFF

QUAD LEVEL

DECODE

OVP/UVP

LATCH

SHDNB

STBY

SHUTDOWN BIAS ON/OFF

DECODER

VTT ON/OFF VTTR ON/OFF

0.7 x INTREF

INTREF + 10%

20ms

TIMER

INTREF - 10%

POK1

N

FB

1.0V

LX

ZERO CROSSING

VDD - 1V

LX

VOUT = 1.8V

VOUT = 2.5V

DISCHARGE

LOGIC

N

FB

DECODE

INTREF

2V

REFERENCE

POK2

REFIN / 2 - 10%

REFIN / 2 + 10%

+0.4V

POWER-DOWN*

VTT ILIM

N

CURRENT

LIMITS

VTTR ILIM

10kΩ

10kΩ

REFIN / 2

VDD

N

VDD

N

VTTI

*POWER-DOWN

FORCES POK2 LOW

AND VTT, VTTR TO

HIGH IMPEDANCE.

REFIN / 2 - 10%

REFIN / 2 + 10%

SS

Figure 1. Functional Diagram

PGND2

ILIM

SKIP

(TP1 IN MAX8551

MUST BE CONNECTED TO GND)

OUT

AVDD

GND

REF

VTTS

REFIN

VTTI

VTT

PGND2

VTTR

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