LTC1503-1.8/LTC1503-2
PI FU CTIO S
turn-on (see Applications Information). If neither of the
two functions are desired, the pin may be floated or tied
to V
IN
.
C2
+
(Pin 6):
Flying Capacitor Two Positive Terminal.
GND (Pin 7):
Ground. Connect to a ground plane for best
performance.
C2
–
(Pin 8):
Flying Capacitor Two Negative Terminal.
BLOCK DIAGRA
V
IN
C
IN
680k
330k
990k
SHORT CIRCUIT
MODE SKIP
600kHz
OSCILLATOR
V
IN
2µA
REG ENABLE
COMP1
SOFT-START
350mV
V
REF
RAMP
SHDN/SS
+
SHDN
350mV
+
–
LTC1503-2
1503-1.8/2 BD
+
COMP2
–
–
–
+
+
+
+
–
+
W
U
U
U
+
–
MODE
CONTROL
STEP-DOWN
CHARGE
PUMP
C1
+
C1
–
C2
+
+
–
V
OUT
C2
–
V
OUT
C
OUT
+
150mV
800k
10mV
1.2M
1.2V
V
REF
GND
5