MAX1556 datasheet(7/12 Pages) MAXIM

Part #	MAX1556

Description	16關A IQ, 1.2A PWM Step-Down DC-DC Converters

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Manufacturer	MAXIM [Maxim Integrated Products]

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16µA IQ, 1.2A PWM DC-DC

Step-Down Converters

_______________________________________________________________________________________

7

LX

SS

ON

OFF

SHDN

GND

INPUT

2.6V TO 5.5V

VOLTAGE

SELECT

OUTPUT

0.75V TO VIN

PGND

C1

10

µF

C4

0.47

µF

R1

100

Ω

C2

22

µF

C3

1000pF

L1

3.3

µH

OUT

INP

IN

1.2A

D1

D2

MAX1556

Figure 2. MAX1556 Typical Application Circuit

Figure 1. Functional Diagram

LX

SS

ON

OFF

SHDN

GND

INPUT

2.6V TO 5.5V

VOLTAGE

SELECT

OUTPUT

0.75V TO VIN

PGND

C4

10

µF

C5

22

µF

C6

1000pF

L2

4.7

µH

OUT

INP

IN

600mA

D1

D2

MAX1557

Figure 3. MAX1557 Typical Application Circuit

PWM

COMPARATOR

ERROR

AMPLIFIER

CURRENT-LIMIT

COMPARATOR

0.675V

CURRENT

SENSE

SLOPE

COMP

CLOCK

1MHz

INP

LX

PGND

SS

GND

PWM

AUTO SKIP

CONTROL

SKIP-OVER

ENTER SKIP/

SR OFF

VCS

ZERO-CROSS

DETECT

SHORT-CIRCUIT

PROTECTION

REFERENCE

1.25V

OUT

D1

D2

SHDN

IN

BIAS

OUTPUT

VOLTAGE

SELECTOR

MAX1556

MAX1557

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MAX1556 Datasheet(PDF) 7 Page - Maxim Integrated Products

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