Functional Diagrams

Σ

Σ

Q

S

R

Q

TRIG

ONE-SHOT

TRIG

Q

ONE-SHOT

TON

ON-TIME

COMPUTE

VTT

LATCH

Q

RS

VTTR

VTT

POK

ERROR

COMP

OVP

60%

56%

50%

44%

VL

0.6V

5V

REG

2V

REF

/10

5

µA

MAX8553

FSEL

POK

REFIN

EN/HSD

VTTR

GND

REF

VL

VTT

PGND

DL

V+

LX

DH

BST

ILIM

4.5V to 28V Input, Synchronous PWM Buck Controllers

for DDR Termination and Point-of-Load Applications

12

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