LTC3440 Datasheet, PDF (7/20 Pages) Linear Technology – Micropower Synchronous Buck-Boost DC/DC Converter

BLOCK DIAGRA
LTC3440
V_IN
2.5V TO 5.5V
7
+
SW1
3
SW A
SW B
GATE
DRIVERS
AND
ANTICROSS
CONDUCTION
SW2
4
SW D
–0.4A
SW C
I_SENSE
AMP
REVERSE
CURRENT
LIMIT
V_OUT
6
V_OUT
2.5V TO 5.5V
SUPPLY
CURRENT
LIMIT
+
ERROR
AMP
1.22V
2.7A
–
UVLO
+
PWM
LOGIC
AND
OUTPUT
PHASING
PWM
COMPARATORS
R1
FB
9
CLAMP
2.4V
–
R_{T RT}
1
OSC
SYNC
MODE/SYNC 2
1 = Burst Mode
OPERATION
0 = FIXED FREQUENCY
SLEEP
Burst Mode
OPERATION
CONTROL
5μs DELAY
5
GND
SHUTDOWN
V_C
10
R2
SHDN/SS ^RSS
8
V_IN
C_SS
3440 BD
3440fb
7