ltc3523-ltc3523-2 Linear Technology Corporation, ltc3523-ltc3523-2 Datasheet - Page 7

• Manufacturer Part Number: ltc3523-ltc3523-2
• Description: Synchronous 600ma Step-up And 400ma Step-down Dc/dc Converters
• Manufacturer: Linear Technology Corporation

BLOCK DIAGRAM
1.8V TO 5.5V
V
IN
+
C
47μF
IN
15
11
13
3
9
PGOOD1
V
V
PGOOD2
SHDN2
SHUTDOWN
BAT
IN2
SLOPE COMPENSATION
V
AND
BIAS
SLP
16
SHDN1
SHUTDOWN
V
AND
BIAS
PWM/I
OSC
OSCILLATOR
COMP
SHDN
–
+
–
+
LIM
MODE
2
I
REF
SLOPE COMPENSATION
LIM
V
–
IN1
FB1
1.2V
–9%
FB2
0.6V
–9%
I
REF
SHDN
+ –
LIM
+
GND1
6
ANTI-RING
DRIVERS
4.7μH
LOGIC
SLP
R
PWM
+
AND
L1
Z
+
–
–
C
PWM/I
COMP
C1
+
+
ZERO CURRENT
OSC
SLP
OSC
LIM
GND2
COMP
7
MODE
5
SW1
R
THERMAL SHDN
CURRENT
SENSE
Z
C
+
–
REFERENCE
C1
GND3
14
0A
DRIVERS
C
LOGIC
PWM
MODE
AND
C2
MODE
AMPLIFIER
g
m
AMPLIFIER
g
BULK CONTROL
m
ERROR
LTC3523/LTC3523-2
ERROR
SIGNALS
SOFT-START
THERM REG
+ –
0.6V
1.2V
1V
START-UP
COMP
SOFT-START
LIMIT
THERM REG
V
MODE
START-UP
OUT
AND
MODE
AND
–
+
–
+
I
COMP
ZERO
+
–
STEP-DOWN
GND2
STEP-UP
0.6V
0.6V
SHARED
1.2V
MODE
V
SW2
OUT
FB1
FB2
3523 BD
10
12
4
1
8
4.7μH
R1
R2
L2
R3
R4
V
STEP-UP
1.8V TO 5.25V
OUT
C
10μF
OUT
C
10μF
V
STEP-DOWN
0.615V TO 5.5V
OUT
OUT
7
3523f