LTC3523-2_15 Datasheet, PDF (7/16 Pages) Linear Technology – Synchronous 600mA Step-Up and 400mA Step-Down DC/DC Converters

LTC3523/LTC3523-2
BLOCK DIAGRAM
V_IN
1.8V TO 5.5V ₊
C_IN
47μF
16
SHDN1
2
V_IN1
L1
4.7μH
5
SW1
BULK CONTROL
SIGNALS
SHUTDOWN
AND
V_BIAS
SHDN
MODE
OSC
ANTI-RING
PWM
LOGIC
AND
DRIVERS
CURRENT
SENSE
V_OUT
4
V_OUT
STEP-UP
1.8V TO 5.25V
I_ZERO
COMP
PWM/I_LIM
COMP
PGOOD1
3
+
I_LIM
+
REF
SLOPE COMPENSATION
FB1
SLP
1.2V
–9%
C_C1
R_Z
MODE
MODE
g_m ERROR
AMPLIFIER
FB1
1
1.2V
C_C2
START-UP
SOFT-START
AND
THERM REG
R1
C_OUT
10μF
R2
STEP-UP
15 ^VBAT
OSCILLATOR
OSC
0.6V
REFERENCE
1.2V
SLP
1V
THERMAL SHDN
MODE 10
SHARED
V_IN2
9
+
SLOPE COMPENSATION
SLP
PGOOD2
11
I_LIM
REF
FB2
0.6V
–9%
+
ZERO CURRENT
COMP
PWM/I_LIM
COMP
+
––
MODE
OSC
STEP-DOWN
0A
PWM
LOGIC
AND
DRIVERS
V_OUT
LIMIT
COMP
SW2
8
L2
4.7μH
GND2
0.66V
V_OUT
STEP-DOWN
0.615V TO 5.5V
SHDN2 ^SHUTDOWN
13
AND
V_BIAS
SHDN
C_C1
R_Z
GND1
6
GND2
7
MODE
MODE
g_m ERROR
AMPLIFIER
FB2
12
0.6V
GND3
14
START-UP
SOFT-START
AND
THERM REG
3523 BD
R3
C_OUT
10μF
R4
3523fb
7