LTC3444_15 Datasheet, PDF (6/20 Pages) Linear Technology – Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications

LTC3444
BLOCK DIAGRA
SW1
2
SW2
4
2.75V TO 5.5V
V_IN
6
+
2.5A
3.5A
2.65V
A
B
GATE DRIVERS
AND
ANTI-CROSS
CONDUCTION
D
3A
C
PEAK
REVERSE
CURRENT
LIMIT
V_OUT
5
INPUT
+
CURRENT
LIMIT
–
OUTLOW
1.8V
335k
OUTPUT OV
PEAK
+
CURRENT
LIMIT
–
+
UVLO
–
PWM LOGIC
AND
OUTPUT PHASING
PWM
COMPARATORS
THERMAL
SHUTDOWN
1.22V
100k
1.22V
EA
FB
8
INTERNAL
COMPENSATION
GND = INTERNAL COMP
FLOAT = EXTERNAL COMP
V_C
7
OSC
SOFTSTART
1 ^VIN
THERMAL
SHUTDOWN
INTERNAL
SOFTSTART
SHDN
GND
UVLO
3
V_OUT
3444 BD
3444fb
6