Datasheet

4
LTC1550L/LTC1551L
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Supply Current vs Temperature
Oscillator Frequency vs
Temperature
OUTPUT VOLTAGE (V)
–5
POSITIVE SUPPLY VOLTAGE (V)
6.0
5.6
5.2
4.8
4.4
4.0
3.6
3.2
2.8
2.4
2.0
–1
1550L/51L G03
–4
–3
–2
0
I
OUT
= 20mA
I
OUT
= 10mA
I
OUT
= 5mA
Minimum Required V
CC
vs V
OUT
and I
OUT
TEMPERATURE (˚C)
–55 –35 –15 5 25 45 65 85 105 125
OSCILLATOR FREQUENCY (kHz)
875
925
975
1550L/51L G01
825
775
725
675
V
CC
= 5V
V
OUT
= –4.1V
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
1550L/51L G02
V
CC
= 5V
V
OUT
= –4.1V
–55 –35 –15 5 25 45 65 85 105 125
5.0
4.5
4.0
3.5
3.0
2.5
Reference Voltage vs V
CC
+ |V
OUT
|Start-Up Time vs Supply Voltage
Maximum Output Current
vs Supply Voltage
Load Transient Response
(See Figure 3, V
CC
= 5V)
Line Transient Response
(See Figure 3, I
L
= 10mA)
5V
0V
–4.1V
V
OUT
SHDN
0.2ms/DIV 1550/51 G07
Startup Time (LTC1550L Shown)
0V
5V
0V
POWER VALID
0mA
1ms/DIV
1550/51 G08
10mA
V
OUT
5mV/DIV
AC
COUPLED
I
OUT
4.75V
2ms/DIV
1550/51 G09
V
OUT
5mV/DIV
AC
COUPLED
5.25V
V
CC
SUPPLY VOLTAGE (V)
2.25 2.75 3.25 3.75 4.25 4.75 5.25
MAXIMUM OUTPUT CURRENT (mA)
1550L/51L G04
80
70
60
50
40
30
20
10
0
T
A
= 25°C
V
OUT
= –2V V
OUT
= –2.5V
V
OUT
= –4.1V
SUPPLY VOLTAGE (V)
2.25 2.75 3.25 3.75 4.25 4.75 5.25
START-UP TIME (ms)
1550L/51L G05
2.5
2.0
1.5
1.0
0.5
0
T
A
= 25°C
V
OUT
= –2V
R
L
= 390Ω
V
OUT
= –4.1V
R
L
= 820Ω
1.24
1.238
1.236
1.234
1.232
1.230
1.228
1.226
1.224
1.222
1.220
1.218
V
CC
+ |V
OUT
| (V)
456789104.5 5.5 6.5 7.5 8.5 9.5
REFERENCE VOLTAGE (V)
1550L/51L G06
T
A
= 25°C