LTC3202
TYPICAL PERFOR A CE CHARACTERISTICS
Short-Circuit Current vs Supply
Voltage
300
280
C
FLY
= 1µF
V
FB
= 0V
V
OUT
= 0V
T
A
= 25°C
OUTPUT CURRENT (mA)
V
OUT
Soft-Start Ramp
V
IN
(AC COUPLED)
20mV/DIV
V
D0, D1
2V/DIV
V
OUT
1V/DIV
V
IN
= 3.6V
C
OUT
= 1µF
PI FU CTIO S
D1, D0 (Pin 1, 10):
Control Inputs. D0 and D1 determine
the set point voltage of the FB pin (see Table 1).
FB (Pin 2):
FB is the Feedback Input for the Regulation
Control Loop.
V
OUT
(Pin 3):
V
OUT
is the Output of the Charge Pump. A low
impedance 1µF X5R or X7R ceramic capacitor is required
from V
OUT
to GND.
V
IN
(Pin 4):
Input Supply Voltage. V
IN
should be bypassed
with a 1µF to 4.7µF low impedance ceramic capacitor.
GND (Pin 5):
Ground for the Charge Pump and Control
Circuitry. This pin should be connected directly to a low
impedance ground plane.
C2
–
, C1
–
, C1
+
, C2
+
(Pin 6, 7, 8, 9):
Charge Pump Flying
Capacitor Pins. A 1µF X5R or X7R ceramic capacitor
should be connected from C1
+
to C1
–
and from C2
+
to
C2
–
.
PGND (Pin 11, Exposed Pad DFN Only):
Power Ground
for the Charge Pump. This pin must be connected directly
to a low impedance ground plane.
4
U W
260
240
220
200
180
2.7
3.0
3.3
3.6
3.9
INPUT SUPPLY (V)
4.2
4.5
3202 G07
Input and Output Ripple
V
OUT
(AC COUPLED)
20mV/DIV
200µs/DIV
3202 G08
500ns/DIV
V
IN
= 3.6V
C
IN
= C
OUT
= 1µF
I
OUT
= 60mA
3202 G09
U
U
U
3202fa
LINER [ LINEAR TECHNOLOGY ]
