Rainbow-electronics MAX1718 Uživatelský manuál stáhnout pdf (Strana 13)

MAX1718

Notebook CPU Step-Down Controller for Intel

Mobile Voltage Positioning (IMVP

II)

______________________________________________________________________________________ 13

REF

-10%

FROM

D/A

REF

OVP

ZMODE

TIME

10k

ERROR

AMP

TOFF

TON

REF

+10%

NEG

R-2R

D/A CONVERTER

CHIP SUPPLY

POS

VGATE

D0 D1 D2 D3

S1SUS

S0 D4

ON-TIME

COMPUTE

TON

1-SHOT

TRIG

BATT

2V TO 28V

TRIG

REF

GND

OUTPUT

ZERO CROSSING

CURRENT

LIMIT

BST

LIM

REF

OVP/UVP

DETECT

SKP/SDN

TON

V+

70kΩ

MAX1718

MUXES AND SLEW CONTROL

Figure 2. Functional Diagram

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 34 35

Ordering Information 1
Minimal Operating Circuit 1
General Description 1
Applications 1
Features 1
ABSOLUTE MAXIMUM RATINGS 2
ELECTRICAL CHARACTERISTICS 2
MAX1718 toc07 7
MAX1718 toc15 8
MAX1718 toc16 8
Pin Description 9
Pin Description (continued) 10
Detailed Description 12
Forced-PWM Mode (SKP/ 14
Integrator Amplifiers/Output 14
Voltage Offsets 14
Current-Limit Circuit 15
MOSFET Gate Drivers (DH, DL) 16
Shutdown 17
DAC Inputs D0–D4 17
Using the ZMODE Mux 19
Table 5. DAC Mux Operation 21
Output Overvoltage Protection 22
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 26
MOSFET Power Dissipation 26
Applications Information 27
High-Accuracy Current Limit 28
Dropout Performance 30
Adjusting V 30
(5V Input) Applications 30
Ceramic Output Capacitor 31
PC Board Layout Guidelines 31
Chip Information 32
Pin Configuration 34
Package Information 35

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