Rainbow Electronics MAX15041 - Manual (Page 8)

MAX15041
Low-Cost, 3A, 4.5V to 28V Input, 350kHz, PWM
Step-Down DC-DC Regulator with Internal Switches
8 _______________________________________________________________________________________
Simplified Block Diagram
ENABLE CONTROL
AND THERMAL
SHUTDOWN
CONTROL
LOGIC AND
SINK LIMIT
5V LDO
UVLO
COMPARATOR
CURRENT-SENSE/CURRENT-LIMIT
AMPLIFIER
4V
V
DD
LX
V
DD
BIAS
GENERATOR
0.65V
EN
VOLTAGE
REFERENCE
STRONG PREBIAS
COMPARATOR
PWM
COMPARATOR
ERROR
AMPLIFIER
OSCILLATOR
MAX15041
N
N
PGND
LX
IN
BST
V
DD
PGOOD
0.606V
5 µA
0.560V RISING,
0.545V FALLING
POWER-GOOD
COMPARATOR
N
Σ
SS
FB
SS
COMP
SGND