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LT1521IST-5#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LT1521/LT1521-3
LT1521-3.3/LT1521-5
1521335fb
The LT
®
1521/LT1521-3/LT1521-3.3/LT1521-5 are low
dropout regulators with micropower quiescent current
and shutdown. These devices are capable of supplying
300mA of output current with a dropout voltage of 0.5V.
Designed for use in battery-powered systems, the low
quiescent current, 12µA operating and 6µA in
shutdown, makes them an ideal choice. The quiescent
current is well controlled; it does not rise in dropout as it
does with many other low dropout PNP regulators.
Other features of the LT1521/LT1521-3/LT1521-3.3/
LT1521-5 include the ability to operate with very small
output capacitors. They are stable with only 1.5µF on the
output while most older devices require between 10µF and
100µF for stability. Small ceramic capacitors can be used,
enhancing manufacturability. Also, the input may be con-
nected to voltages lower than the output voltage, including
negative voltages, without reverse current flow from out-
put to input. This makes the LT1521 series ideal for backup
power situations where the output is held high and the
input is low or reversed. Under these conditions only 5µA
will flow from the output pin to ground.
300mA Low Dropout
Regulators with Micropower
Quiescent Current and Shutdown
5V Battery-Powered Supply with Shutdown
Dropout Voltage
■
Dropout Voltage: 0.5V
■
Output Current: 300mA
■
Quiescent Current: 12
µ
A
■
No Protection Diodes Needed
■
Adjustable Output from 3.8V to 20V
■
Fixed Output Voltages: 3V, 3.3V, 5V
■
Controlled Quiescent Current in Dropout
■
Shutdown I
Q
= 6µA
■
Reverse Battery Protection
■
No Reverse Current
■
Thermal Limiting
OUTPUT CURRENT (mA)
0
0
DROPOUT VOLTAGE (V)
0.1
0.2
0.3
0.4
0.6
50
100 150 200
LT1521 • TA02
250 300
0.5
8
5
1
2
3
+
6V 1.5µF1µF
5V
300mA
V
SHDN
(PIN 5) OUTPUT
<0.25 OFF
>2.80 ON
NC ON
LT1521-5
GND
IN
SHDN
OUT
SENSE
LT1521 • TA01
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Low Current Regulator
■
Regulator for Battery-Powered Systems
■
Post Regulator for Switching Supplies
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
2
LT1521/LT1521-3
LT1521-3.3/LT1521-5
1521335fb
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
3
2
1
FRONT VIEW
TAB IS
GND
OUT
GND
IN
ST PACKAGE
3-LEAD PLASTIC SOT-223
T
JMAX
= 125°C, θ
JA
= 50°C/W
SEE THE APPLICATIONS INFORMATION SECTION
ORDER PART NUMBER
ORDER PART NUMBER
1
2
3
4
8
7
6
5
TOP VIEW
IN
GND
GND
SHDN
OUT
SENSE/ADJ*
GND
NC
S8 PACKAGE
8-LEAD PLASTIC SO
*PIN 2 = SENSE FOR LT1521-3/LT1521-3.3/LT1521-5
= ADJ FOR LT1521
T
JMAX
= 125°C, θ
JA
= 70°C/W
SEE THE APPLICATIONS INFORMATION SECTION
ORDER PART NUMBER
T
JMAX
= 125°C, θ
JA
= 125°C/W
1
2
3
4
OUT
SENSE/ADJ*
NC
GND
8
7
6
5
IN
NC
NC
SHDN
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
*PIN 2 = SENSE FOR LT1521-3/
LT1521-3.3/LT1521-5
PIN 2 = ADJ FOR LT1521
Input Voltage ...................................................... ±20V*
Output Pin Reverse Current .................................. 10mA
Adjust Pin Current ................................................ 10mA
Shutdown Pin Input Voltage (Note 1) ..........6.5V, –0.6V
Shutdown Pin Input Current (Note 1) ..................... 5mA
Output Short-Circuit Duration.......................... Indefinite
Storage Temperature Range ................. –65°C to 150°C
Operating Junction Temperature Range (Note 2)
Commercial ........................................... 0°C to 125°C
Industrial ......................................... –40°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
*For applications requiring input voltage ratings greater than 20V, contact
the factory.
LT1521CMS8
LT1521CMS8-3
LT1521CMS8-3.3
LT1521CMS8-5
LT1521CS8
LT1521CS8-3
LT1521CS8-3.3
LT1521CS8-5
LT1521IS8
LT1521IS8-3
LT1521IS8-3.3
LT1521IS8-5
LT1521CST-3
LT1521CST-3.3
LT1521CST-5
LT1521IST-3
LT1521IST-3.3
LT1521IST-5
S8 PART MARKING
ST PART MARKING
MS8 PART MARKING
1521
15213
152133
15215
LTEZ
LTFB
LTDU
LTFA
1521I
1521I3
1521I33
1521I5
1521I3
1521I33
1521I5
15213
152133
15215
(Note 1)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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.
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LT1521IST-5#PBF

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Buy LT1521IST-5#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LDO Voltage Regulators Micropower Low Dropout Regulators with Shutdown
Lifecycle:
New from this manufacturer.
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