Rainbow-electronics MAX1717 Manual do Utilizador descarregar pdf (Página 15)

MAX1717

Dynamically Adjustable, Synchronous

Step-Down Controller for Notebook CPUs

______________________________________________________________________________________ 15

REF

-7%

FROM

D/A

REF

D0A/B D1 D2 D3 D4 TIME

10k

ERROR

AMP

TOFF

TON

REF

+12%

R-2R

D/A CONVERTER

CHIP SUPPLY

GNDS

FBS

VGATE

ON-TIME

COMPUTE

TON

1-SHOT

TRIG

BATT

2V TO 28V

TRIG

REF

GND

+5V

OUTPUT

ZERO CROSSING

CURRENT

LIMIT

BST

LIM

REF

+5V

OVP/UVP

DETECT

SKP/SDN

TON

V+

70k

MAX1717

120k

MUX AND SLEW CONTROL

Figure 2. Functional Diagram

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 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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