Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
kB3440
SIMPLIFIED BLOC DIAGRAM
SW1
SW2
3
4
V
OUT
2.5V TO 5.5V
V
IN
2.5V TO 5.5V
SW A
SW D
V
OUT
7
6
+
GATE
DRIVERS
AND
ANTICROSS
CONDUCTION
–0.4A
–
SW B
SW C
+
I
REVERSE
CURRENT
LIMIT
SENSE
AMP
SUPPLY
CURRENT
LIMIT
–
+
ERROR
AMP
+
–
1.22V
+
–
R1
2.7A
2.4V
PWM
LOGIC
FB
PWM
COMPARATORS
9
AND
UVLO
OUTPUT
PHASING
CLAMP
–
+
+
–
V
C
R
T
10
R
T
OSC
1
R2
SYNC
Burst Mode
OPERATION
CONTROL
SLEEP
R
SS
SHDN/SS
V
IN
8
SHUTDOWN
5µs DELAY
C
SS
MODE/SYNC
2
1 = Burst Mode
OPERATION
0 = FIXED FREQUENCY
5
GND
7