Rainbow-electronics MAX1717 Manual do Utilizador descarregar pdf (Página 12)

MAX1717

Dynamically Adjustable, Synchronous

Step-Down Controller for Notebook CPUs

12 ______________________________________________________________________________________

BATT

7V TO 24V

+5V

BIAS SUPPLY

6 x 470µF

KEMET T510

POWER-GOOD

INDICATOR

1µH

A/B = LOW = 1.60V

A/B = HIGH = 1.35V

SKP/SDN

V+

221

CMPSH-3

1µF

0.1µF

1µF

470pF

TO V

100kΩ

1µF

20Ω

4 x

10µF, 25V

TIME

ON/OFF

CONTROL

BST

GND

FBS

GNDS

Q1 = IRF7811

Q2 = 2 x IRF7805

D1 = INTL RECT 10MQ040N

C1 = TAIYO YUDEN TMK432BJ106KM

C2 = KEMET T510X477M006

L1 = SUMIDA CEP125

VGATE

MAX1717

+5V

TON

REF

A/B

ILIM

120kΩ

100kΩ

TO V

HIGH/LOW

OUT

Figure 1. Standard Application Circuit

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 32 33

General Description 1
Applications 1
Features 1
Ordering Information 1
Minimal Operating Circuit 1
ABSOLUTE MAXIMUM RATINGS 2
ELECTRICAL CHARACTERISTICS 2
Pin Description 10
Pin Description (continued) 11
International 13
Detailed Description 14
Figure 2. Functional Diagram 15
Integrator Amplifiers 16
Forced-PWM Mode (SKP/ 18
Current-Limit Circuit 18
MOSFET Gate Drivers (DH, DL) 18
Shutdown 19
DAC Inputs D0–D4 19
Internal Mux 20
B-Mode DAC Codes 21
Output Overvoltage Protection 23
Output Undervoltage Shutdown 23
Design Procedure 24
Inductor Selection 25
Setting the Current Limit 25
Output Capacitor Selection 25
Output Capacitor Stability 26
Considerations 26
Input Capacitor Selection 26
Power MOSFET Selection 27
MOSFET Power Dissipation 27
Application Issues 28
Dropout Performance 29
Adjusting V 29
Above 2V 29
(5V Input) Applications 30
Ceramic Output Capacitor 30
PC Board Layout Guidelines 30
Layout Procedure 31
Pin Configuration 32
Chip Information 32
Package Information 33

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