Datasheet

3
LTC1754-3.3/LTC1754-5
TYPICAL PERFOR A CE CHARACTERISTICS
UW
LTC1754-3.3, T
A
= 25°C unless otherwise noted.
No Load Supply Current
vs Supply VoltageOutput Voltage vs Output Current Supply Current vs V
SHDN
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE (V)
3.30
3.35
80
1754 G01
3.25
3.20
20
40
60
100
3.40
T
A
= 25°C
C
OUT
= 10µF
C
FLY
= 1µF
V
IN
= 2.5V
V
IN
= 2V
SUPPLY VOLTAGE (V)
2.0
5
SUPPLY CURRENT (µA)
10
15
20
2.5 3.0 3.5 4.0
1754 G02
4.5
I
OUT
= 0µA
C
FLY
= 1µF
V
SHDN
= V
IN
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
V
SHDN
CONTROL VOLTAGE (V)
1
SUPPLY CURRENT (µA)
10
15
5
1754 G03
5
0
2
3
4
20
T
A
= 25°C
I
OUT
= 0µA
V
IN
= 4.5V
V
IN
= 2.5V
V
IN
= 2V
Efficiency vs Load Current
V
OUT
Short-Circuit Current
vs Supply Voltage
SUPPLY VOLTAGE (V)
2.0
60
V
OUT
SHORT-CIRCUIT CURRENT (mA)
80
100
120
140
160
180
2.5 3.0 3.5 4.0
1735 G04
4.5
T
A
= 25°C
C
FLY
= 1µF
LOAD CURRENT (mA)
0.001
40
EFFICIENCY (%)
50
60
70
80
0.01 0.1 1 10 100
1754 G05
30
20
10
0
90
100
T
A
= 25°C
V
IN
= 2V
C
FLY
= 1µF
Output Ripple
Load Transient Response
Start-Up Time
I
OUT
0mA to 20mA
10mA/DIV
V
OUT
AC COUPLED
20mV/DIV
V
IN
= 2V 50µs/DIV 1754 G07
C
OUT
= 10µF
V
OUT
AC COUPLED
20mV/DIV
V
IN
= 2V 5µs/DIV 1754 G08
C
OUT
= 10µF
I
OUT
= 20mA
SHDN
1V/DIV
V
OUT
1V/DIV
V
IN
= 2V 200µs/DIV 1754 G9
C
OUT
= 10µF