Datasheet

3
LT1521/LT1521-3
LT1521-3.3/LT1521-5
1521335fb
PARAMETER CONDITIONS MIN TYP MAX UNITS
Regulated Output Voltage LT1521-3 V
IN
= 3.5V, I
OUT
= 1mA, T
J
= 25°C 2.950 3.000 3.050 V
(Note 4) 4V < V
IN
< 20V, 1mA < I
OUT
< 300mA ● 2.900 3.000 3.100 V
LT1521-3.3 V
IN
= 3.8V, I
OUT
= 1mA, T
J
= 25°C 3.250 3.300 3.350 V
4.3V < V
IN
< 20V, 1mA < I
OUT
< 300mA ● 3.200 3.300 3.400 V
LT1521-5 V
IN
= 5.5V, I
OUT
= 1mA, T
J
= 25°C 4.925 5.000 5.075 V
6V < V
IN
< 20V, 1mA < I
OUT
< 300mA ● 4.850 5.000 5.150 V
LT1521 (Note 5) V
IN
= 4.3V, I
OUT
= 1mA, T
J
= 25°C 3.695 3.750 3.805 V
4.8V < V
IN
< 20V, 1mA < I
OUT
< 300mA ● 3.640 3.750 3.860 V
Line Regulation LT1521-3 ∆V
IN
= 4.5 to 20V, I
OUT
= 1mA ● 1.5 20 mV
LT1521-3.3 ∆V
IN
= 4.8 to 20V, I
OUT
= 1mA ● 1.5 20 mV
LT1521-5 ∆V
IN
= 5.5 to 20V, I
OUT
= 1mA ● 1.5 20 mV
LT1521 (Note 5) ∆V
IN
= 4.3 to 20V, I
OUT
= 1mA ● 1.5 20 mV
Load Regulation LT1521-3 ∆I
LOAD
= 1mA to 300mA, T
J
≤ 25°C–20–30mV
LT1521-3.3 ∆I
LOAD
= 1mA to 300mA, T
J
≤ 25°C–20–30mV
LT1521-5 ∆I
LOAD
= 1mA to 300mA, T
J
≤ 25°C–25–45mV
LT1521 (Note 5) ∆I
LOAD
= 1mA to 300mA, T
J
≤ 25°C–20–30mV
LT1521-3 ∆I
LOAD
= 1mA to 300mA, T
J
>25°C–20–55mV
LT1521-3.3 ∆I
LOAD
= 1mA to 300mA, T
J
> 25°C–20–55mV
LT1521-5 ∆I
LOAD
= 1mA to 300mA, T
J
> 25°C–25–75mV
LT1521 (Note 5) ∆I
LOAD
= 1mA to 300mA, T
J
> 25°C–20–55mV
Dropout Voltage (Note 6) I
LOAD
= 1mA, T
J
= 25°C 130 170 mV
I
LOAD
= 1mA ● 250 mV
I
LOAD
= 50mA, T
J
= 25°C 290 350 mV
I
LOAD
= 50mA ● 450 mV
I
LOAD
= 100mA, T
J
= 25°C 350 420 mV
I
LOAD
= 100mA ● 550 mV
I
LOAD
= 150mA, T
J
= 25°C 400 470 mV
I
LOAD
= 150mA ● 600 mV
I
LOAD
= 300mA, T
J
= 25°C 500 600 mV
I
LOAD
= 300mA ● 750 mV
Ground Pin Current (Note 7) I
LOAD
= 0mA ● 12 25 µA
I
LOAD
= 1mA ● 65 100 µA
I
LOAD
= 10mA ● 300 450 µA
I
LOAD
= 50mA ● 0.8 1.5 mA
I
LOAD
= 100mA ● 1.4 2.5 mA
I
LOAD
= 150mA ● 2.2 4.0 mA
I
LOAD
= 300mA ● 6.5 12.0 mA
Adjust Pin Bias Current (Notes 5, 8) T
J
= 25°C 50 100 nA
Shutdown Threshold V
OUT
= Off to On ● 1.20 2.80 V
V
OUT
= On to Off ● 0.25 0.75 V
Shutdown Pin Current (Note 9) V
SHDN
= 0V ● 2.0 5.0 µA
Quiescent Current in Shutdown (Note 10) V
IN
= V
OUT
(NOMINAL) + 1V, V
SHDN
= 0V ● 612µA
Ripple Rejection V
IN
– V
OUT
= 1V(Avg), V
RIPPLE
= 0.5V
P–P
,5058dB
f
RIPPLE
= 120Hz, I
LOAD
= 150mA
Current Limit V
IN
– V
OUT
= 7V, T
J
= 25°C 400 800 mA
V
IN
= V
OUT
(NOMINAL) + 1.5V, ∆V
OUT
= –0.1V ● 320 400 mA
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.