__________________________________________Typical Operating Characteristics

100

50

0.001

0.1

1

0.01

10

EFFICIENCY vs.

LOAD CURRENT (3.3V/1A CIRCUIT)

60

LOAD CURRENT (A)

70

80

90

V+ = 6V

MAX1653

f = 300kHz

V+ = 28V

V+ = 12V

100

50

0.001

0.1

1

0.01

10

EFFICIENCY vs.

LOAD CURRENT (3.3V/2A CIRCUIT)

60

LOAD CURRENT (A)

70

80

90

V+ = 6V

V+ = 28V

V+ = 12V

MAX1653

f = 300kHz

100

50

0.001

0.1

1

0.01

10

EFFICIENCY vs.

LOAD CURRENT (3.3V/3A CIRCUIT)

60

LOAD CURRENT (A)

70

80

90

V+ = 6V

V+ = 28V

V+ = 12V

MAX1653

f = 300kHz

High-Efficiency, PWM, Step-Down

DC-DC Controllers in 16-Pin QSOP

6

_______________________________________________________________________________________

MAX1654

SHDN

DH

-5V

OUTPUT

+5V

OUTPUT

INPUT

6V TO 30V

BST

LX

DL

PGND

CSH

CSL

SS

REF

FROM

REF

SYNC

GND

V+

VL

FB

SECFB

Typical Operating Circuits (continued)