LTC3538 Datasheet, PDF (7/16 Pages) Linear Technology – 800mA Synchronous Buck-Boost DC/DC Converter

BLOCK DIAGRAM
LTC3538
L1
+
V_IN
2.4V TO 5.5V
C_IN
V_IN
8
+
2A –
+
3.5A –
+
2.3V –
BURST
4
1 = BurstMode OPERATION
0 = FIXED FREQUENCY
5μs
DELAY
SW1
7
A
B
ANTI-RING
GATE DRIVERS
AND
ANTICROSS
CONDUCTION
AVERAGE
CURRENT LIMIT
SW2
6
D
0.5A
C
–+
REVERSE
CURRENT
LIMIT
V_OUT
5
V_OUT
R1
C_Z1
C_OUT
PEAK
CURRENT LIMIT
UVLO
PWM LOGIC
AND
PWM
OUTPUT PHASING ^COMPARATORS
THERMAL
SHUTDOWN
OSC
1MHz
BURST
BURST
MODE
CONTROL
SLEEP
SS DONE
FB
GND
3
1V
SOFT-START
FB
1
C_P1
C_P2
R_Z
R2
V_C
2
TSD
UVLO
INTERNAL
SOFT-START
3538 BD
OFF ON
3538fb
7