Datasheet

MAX1953/MAX1954/MAX1957
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
_______________________________________________________________________________________ 9
REFERENCE
AND
SOFT-START
DAC
REFIN
(MAX1957
ONLY)
GND
FB
COMP
0.5V
SHUTDOWN
COMPARATOR
ERROR
AMPLIFIER
SLOPE
COMPENSATION
THERMAL
LIMIT
UVLO
PWM
CONTROL
CIRCUITRY
CLOCK
SHORT-CIRCUIT
CURRENT-LIMIT
CIRCUITRY
ILIM
(MAX1953
ONLY)
CURRENT-LIMIT
COMPARATOR
PGND
DL
IN
LX
CURRENT-
SENSE
CIRCUITRY
DH
BST
HSD
(MAX1954
ONLY)
IN
MAX1953
MAX1954
MAX1957
Functional Diagram
ILIM
COMP
GND
BST
DH
LX
DL
PGND
FB
IN
MAX1953
OUTPUT
0.8V TO 0.86V
IN
INPUT
3V TO 5.5V
Typical Operating Circuit