LTC1754-3.3 LINER [Linear Technology], LTC1754-3.3 Datasheet - Page 5
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LTC1754-3.3
Manufacturer Part Number
LTC1754-3.3
Description
Micropower, Regulated 3.3V/5V Charge Pump with Shutdown in SOT-23
Manufacturer
LINER [Linear Technology]
Datasheet
1.LTC1754-3.3.pdf
(12 pages)
SI PLIFIED
PI FU CTIO S
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1754-3.3. LTC1754-5, T
V
mance, V
ESR capacitor as close as possible to the pin.
GND (Pin 2): Ground. Should be tied to a ground plane for
best performance.
SHDN (Pin 3): Active Low Shutdown Input. A low on
SHDN disables the LTC1754. SHDN must not be allowed
to float.
OUT
100
W
U
90
70
60
50
30
80
40
2.0
(Pin 1): Regulated Output Voltage. For best perfor-
Efficiency vs Supply Voltage
LTC1754-3.3
I
2.5
OUT
OUT
U
= 20mA
3.0
should be bypassed with a 6.8 F (min) low
SUPPLY VOLTAGE (V)
3.5
LTC1754-5
I
OUT
U
BLOCK DIAGRA
4.0
= 25mA
A
SHDN
= 25 C unless otherwise noted.
V
4.5
OUT
W
T
C
A
FLY
= 25 C
C
10 F
5.0
OUT
= 1 F
1754 G19
U
5.5
*CHARGE PUMP SHOWN IN PHASE 1, THE CHARGING PHASE.
PHASE 1 IS ALSO THE SHUTDOWN PHASE
850
800
750
700
650
600
550
500
450
+
–
COMP1
V
2.0
REF
Oscillator Frequency
vs Supply Voltage
W
2.5
3.0
SUPPLY VOLTAGE (V)
CONTROL
3.5
T
A
T
T
C
V
with a 6.8 F (min) low ESR capacitor.
C
A
A
= –40 C
IN
4.0
= 85 C
= 25 C
–
+
*
(Pin 4): Flying Capacitor Negative Terminal.
(Pin 6): Flying Capacitor Positive Terminal.
(Pin 5): Input Supply Voltage. V
4.5
2
2
1
1
5.0
1754 G20
LTC1754-3.3/LTC1754-5
5.5
1754 BD
C
C
+
–
C
1 F
0.95
0.90
0.75
0.65
FLY
0.85
0.80
0.70
2.0
C
10 F
V
vs Supply Voltage
IN
SHDN
2.5
V
IN
Threshold Voltage
3.0
SUPPLY VOLTAGE (V)
IN
should be bypassed
3.5
T
T
T
A
A
A
= –40 C
= 25 C
= 85 C
4.0
4.5
5.0
1754 G21
5
5.5