LT1521/LT1521-3
LT1521-3.3/LT1521-5
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Regulated Output Voltage
(Note 4)
LT1521-3
V
= 3.5V, I
IN
= 1mA, T = 25°C
2.950
2.900
3.250
3.200
4.925
4.850
3.000
3.000
3.300
3.300
5.000
5.000
3.050
3.100
3.350
3.400
5.075
5.150
V
V
V
V
V
V
IN
OUT
J
4V < V < 20V, 1mA < I
V
4.3V < V < 20V, 1mA < I
V
< 300mA
●
●
●
OUT
LT1521-3.3
LT1521-5
= 3.8V, I
= 1mA, T = 25°C
IN
OUT
J
< 300mA
IN
OUT
= 5.5V, I
= 1mA, T = 25°C
IN
OUT
J
6V < V < 20V, 1mA < I
< 300mA
IN
OUT
LT1521 (Note 5)
V
= 4.3V, I
= 1mA, T = 25°C
3.695
3.640
3.750
3.750
1.5
1.5
1.5
1.5
– 20
– 20
– 25
– 20
– 20
– 20
– 25
– 20
130
3.805
3.860
20
20
20
20
–30
–30
–45
–30
–55
–55
–75
–55
170
250
350
450
420
550
470
600
600
750
20
100
450
1.5
2.5
4.0
12.0
100
2.80
V
V
IN
OUT
J
4.8V < V < 20V, 1mA < I
∆V = 4.5 to 20V, I
∆V = 4.8 to 20V, I
∆V = 5.5 to 20V, I
< 300mA
●
●
●
●
●
IN
OUT
Line Regulation
Load Regulation
LT1521-3
LT1521-3.3
LT1521-5
= 1mA
= 1mA
= 1mA
= 1mA
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
IN
OUT
OUT
OUT
OUT
IN
IN
LT1521 (Note 5) ∆V = 4.3 to 20V, I
IN
LT1521-3
LT1521-3.3
LT1521-5
∆I
∆I
∆I
= 1mA to 300mA, T ≤ 25°C
= 1mA to 300mA, T ≤ 25°C
= 1mA to 300mA, T ≤ 25°C
= 1mA to 300mA, T ≤ 25°C
J
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
J
J
J
LT1521 (Note 5) ∆I
LT1521-3
LT1521-3.3
LT1521-5
∆I
∆I
∆I
= 1mA to 300mA, T >25°C
J
= 1mA to 300mA, T > 25°C
= 1mA to 300mA, T > 25°C
= 1mA to 300mA, T > 25°C
J
J
J
LT1521 (Note 5) ∆I
Dropout Voltage (Note 6)
I
I
= 1mA, T = 25°C
= 1mA
LOAD
LOAD
J
●
●
●
●
I
I
= 50mA, T = 25°C
= 50mA
290
350
400
500
LOAD
LOAD
J
I
I
= 100mA, T = 25°C
= 100mA
LOAD
LOAD
J
I
I
= 150mA, T = 25°C
= 150mA
LOAD
LOAD
J
I
I
= 300mA, T = 25°C
= 300mA
mV
mV
µA
µA
LOAD
LOAD
J
●
●
●
●
●
●
●
●
Ground Pin Current (Note 7)
I
I
I
I
I
I
I
= 0mA
= 1mA
12
65
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
= 10mA
= 50mA
= 100mA
= 150mA
= 300mA
300
0.8
1.4
2.2
6.5
50
µA
mA
mA
mA
mA
nA
Adjust Pin Bias Current (Notes 5, 8)
Shutdown Threshold
T = 25°C
J
V
V
= Off to On
= On to Off
●
●
1.20
0.75
V
V
OUT
OUT
0.25
Shutdown Pin Current (Note 9)
Quiescent Current in Shutdown (Note 10)
Ripple Rejection
V
V
V
= 0V
●
●
2.0
6
58
5.0
12
µA
µA
dB
SHDN
= V
(NOMINAL) + 1V, V
= 0V
IN
OUT
SHDN
– V
= 1V(Avg), V
= 120Hz, I
= 0.5V ,
P–P
50
IN
OUT
RIPPLE
f
= 150mA
RIPPLE
LOAD
Current Limit
V
V
– V
= V
= 7V, T = 25°C
(NOMINAL) + 1.5V, ∆V
400
400
800
mA
mA
IN
IN
OUT
OUT
J
= –0.1V
●
320
OUT
3
Linear [ Linear ]
