Datasheet

4
LTC1754-3.3/LTC1754-5
TYPICAL PERFOR A CE CHARACTERISTICS
UW
LTC1754-5, T
A
= 25°C unless otherwise noted.
No Load Supply Current
vs Supply VoltageOutput Voltage vs Output Current Supply Current vs V
SHDN
Efficiency vs Load Current
V
OUT
Short-Circuit Current
vs Supply Voltage
Output RippleLoad Transient Response Start-Up Time
I
OUT
0mA to 50mA
25mA/DIV
V
OUT
AC COUPLED
50mV/DIV
V
IN
= 3V 50µs/DIV 1754 G16
C
OUT
= 10µF
V
OUT
AC COUPLED
20mV/DIV
V
IN
= 3V 5µs/DIV 1754 G17
C
OUT
= 10µF
I
OUT
= 50mA
SHDN
5V/DIV
V
OUT
1V/DIV
V
IN
= 3V 100µs/DIV 1754 G18
C
OUT
= 10µF
OUTPUT CURRENT (mA)
0
4.85
OUTPUT VOLTAGE (V)
4.90
4.95
5.00
5.05
5.10
5.15
20 40 60 80
1574-5 G02
100
T
A
= 25°C
C
OUT
= 10µF
C
FLY
= 1µF
V
IN
= 3V
V
IN
= 2.7V
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
4.0 4.5
1754 G11
2.5
3.0
3.5
5.0 5.5
20
15
10
5
I
OUT
= 0µA
C
FLY
= 1µF
V
SHDN
= V
IN
T
A
= 85°C
T
A
= –40°C
T
A
= 25°C
V
SHDN
CONTROL VOLTAGE (V)
1
SUPPLY CURRENT (µA)
15
20
25
5
1574 G12
10
5
0
2
3
4
6
T
A
= 25°C
I
OUT
= 0µA
V
IN
= 5.5V
V
IN
= 3.3V
V
IN
= 2.7V
SUPPLY VOLTAGE (V)
V
OUT
SHORT-CIRCUIT CURRENT (mA)
4.0 4.5
1754 G13
2.5
3.0
3.5
5.0 5.5
220
180
140
200
160
120
100
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
1754-5 G05
30
20
10
0
90
100
V
IN
= 3V
T
A
= 25°C
C
FLY
= 1µF