LTC3522_15 Datasheet, PDF (8/20 Pages) Linear Technology – Synchronous 400mA Buck-Boost and 200mA Buck Converters

LTC3522
BLOCK DIAGRAM
8
PV_IN1*
11 10
SW1A SW1B
A
BC
PGND1 PGND2
12
V_OUT1
+
D
0.85A –
+
0.250A –
+
0A –
I_ZERO
FILTER
0.9V +
–
PGOOD1
6
V_OUT1
GATE
DRIVES
BUCK-BOOST
PWM
LOGIC
15 ^PVIN2*
INTERNAL
V_CC
OSCILLATOR
UVLO
1.00V
FB1
5
SOFT-START
RAMP
SHDN1
7
PWM
2
SW2
14
GATE
DRIVES
BUCK
PWM
LOGIC
PGND1
0A
+
ZERO CROSSING
–
+
I_LIMIT
0.4A –
+
SLOPE
COMPENSATION
SHDN2
16
1.00V
0.594V
0.9V
0.548V
BANDGAP
REFERENCE
AND OT
SHUTDOWN
FB2
–^gm
+
1
+
0.594V ₊
–
SOFT-START
RAMP
GND PGND1
3
13
*PV_IN1 AND PV_IN2 MUST BE CONNECTED TOGETHER IN THE APPLICATION.
PGND2
9
0.548V +
–
PGOOD2
4
3522 BD
3522fa
8