Rainbow-electronics MAX1635 Manual do Utilizador descarregar pdf (Página 8)

_______Standard Application Circuit

The basic MAX1631/MAX1634 dual-output 3.3V/5V

buck converter (Figure 1) is easily adapted to meet a

wide range of applications with inputs up to 28V by

substituting components from Table 1. These circuits

represent a good set of tradeoffs between cost, size,

and efficiency, while staying within the worst-case

specification limits for stress-related parameters, such

as capacitor ripple current. Don’t change the frequency

of these circuits without first recalculating component

values (particularly inductance value at maximum bat-

tery voltage). Adding a Schottky rectifier across each

synchronous rectifier improves the efficiency of these

circuits by approximately 1%, but this rectifier is other-

wise not needed because the MOSFETs required for

these circuits typically incorporate a high-speed silicon

diode from drain to source. Use a Schottky rectifier

rated at a DC current equal to at least one-third of the

load current.

MAX1630–MAX1635

Multi-Output, Low-Noise Power-Supply

Controllers for Notebook Computers

8 _______________________________________________________________________________________

MAX1631

MAX1634

V+ SHDN VLSECFB

INPUT

ON/OFF

GND

REF

SEQ

1µF

+2.5V ALWAYS ON

*1A SCHOTTKY DIODE REQUIRED

FOR THE MAX1631 (SEE

OUTPUT

OVERVOLTAGE PROTECTION

SECTION).

+5V ALWAYS ON

5V ON/OFF

3.3V ON/OFF

0.1µF

L2 R2

+3.3V OUTPUT

4.7µF

0.1µF

4.7µF

0.1µF

10Ω

0.1µF

DL3

CSH3

CSL3

FB3

RESET

RESET OUTPUT

SKIP

STEER

+5V OUTPUT

DL5

LX5

DH5

BST5

BST3

SYNC

DH3

LX3

PGND

CSL5

CSH5

RUN/ON3

TIME/ON5

FB5

Figure 1. Standard 3.3V/5V Application Circuit (MAX1631/MAX1634)

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 27 28

MAX1630–MAX1635 1

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