Rainbow-electronics MAX5099 Manual do Utilizador descarregar pdf (Página 13)

MAX5099

Functional Diagram

CONVERTER 1

COMP1

PGOOD1

SOURCE1

VDRV

DL1

DRAIN1

V+

BYPASS

FSEL_1

EN1

SYNC

OSC

EN2

DRAIN2

PGOOD2

CONVERTER 2

VLVDRV

CLK2

LDO

0.2V

0.74V

0.8V

TRANSCONDUCTANCE

ERROR AMPLIFIER

FSW/4

FREQUENCY

CONTROL

PWM

COMPARATOR

CLK1

MAX DUTY-CYCLE

CONTROL

FB1

BST1/VDD1

IN_HIGH

ON/OFF

0.9V

PGND

CURRENT

LIMIT

OSCILLATOR

MAIN

OSCILLATOR

GATE

OVERVOLTAGE

STARTUP CIRCUIT/

PROTECTION CIRCUIT/

CHARGE PUMP

20V SHUNT

REGULATOR

1.8V

SGND

BST2/VDD2

SOURCE2

FB2

PGND

COMP2

CHARGE

PUMP

DIGITAL

SOFT-START

FREQUENCY

DIVIDER

MAX5099

Dual, 2.2MHz, Automotive Synchronous Buck

Converter with 80V Load-Dump Protection

______________________________________________________________________________________ 13

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 26 27

General Description 1
Applications 1
Features 1
Ordering Information 1
ABSOLUTE MAXIMUM RATINGS 2
ELECTRICAL CHARACTERISTICS 2
Information 5
Pin Description 11
Pin Description (continued) 12
Functional Diagram 13
Detailed Description 14
Current Limit 16
Output Overvoltage Protection 16
Enable (EN1, EN2) 16
Applications Information 17
Boost Converter 19
Power Dissipation 20
Compensation 21
Procedure 2 (See Figure 4) 22
Boost Converter Compensation 22
Load-Dump Protection MOSFET 23
Improving Noise Immunity 23
PCB Layout Guidelines 24
Layout Procedure 24
Typical Application Circuit 26
Pin Configuration 27
Chip Information 27
Package Information 27

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