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LT1521 Datasheet

300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown

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LT1521/LT1521-3
LT1521-3.3/LT1521-5
300mA Low Dropout
Regulators with Micropower
Quiescent Current and Shutdown
FEATURES
s Dropout Voltage: 0.5V
s Output Current: 300mA
s Quiescent Current: 12µA
s No Protection Diodes Needed
s Adjustable Output from 3.8V to 20V
s Fixed Output Voltages: 3V, 3.3V, 5V
s Controlled Quiescent Current in Dropout
s Shutdown IQ = 6µA
s Reverse Battery Protection
s No Reverse Current
s Thermal Limiting
U
APPLICATIONS
s Low Current Regulator
s Regulator for Battery-Powered Systems
s Post Regulator for Switching Supplies
DESCRIPTION
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
5V Battery-Powered Supply with Shutdown
8 IN
OUT 1
6V 1µF
LT1521-5
5 SHDN
SENSE 2
GND
3
5V
300mA
+
1.5µF
VSHDN (PIN 5) OUTPUT
<0.25
OFF
>2.80
ON
NC ON
LT1521 • TA01
Dropout Voltage
0.6
0.5
0.4
0.3
0.2
0.1
0
0 50 100 150 200 250 300
OUTPUT CURRENT (mA)
LT1521 • TA02
1


Linear Technology Electronic Components Datasheet

LT1521 Datasheet

300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown

No Preview Available !

LT1521/LT1521-3
LT1521-3.3/LT1521-5
ABSOLUTE MAXIMUM RATINGS (Note 1)
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.
PACKAGE/ORDER INFORMATION
OUT 1
SENSE/ADJ* 2
NC 3
GND 4
TOP VIEW
8 IN
7 NC
6 NC
5 SHDN
MS8 PACKAGE
8-LEAD PLASTIC MSOP
*PIN 2 = SENSE FOR LT1521-3/
LT1521-3.3/LT1521-5
PIN 2 = ADJ FOR LT1521
TJMAX = 125°C, θJA = 125°C/ W
ORDER PART NUMBER
LT1521CMS8
LT1521CMS8-3
LT1521CMS8-3.3
LT1521CMS8-5
MS8 PART MARKING
LTEZ
LTFB
LTDU
LTFA
Consult factory for Military grade parts.
TOP VIEW
OUT 1
SENSE/ADJ* 2
GND 3
NC 4
8 IN
7 GND
6 GND
5 SHDN
S8 PACKAGE
8-LEAD PLASTIC SO
*PIN 2 = SENSE FOR LT1521-3/LT1521-3.3/LT1521-5
= ADJ FOR LT1521
TJMAX = 125°C, θJA = 70°C/ W
SEE THE APPLICATIONS INFORMATION SECTION
ORDER PART NUMBER
LT1521CS8
LT1521CS8-3
LT1521CS8-3.3
LT1521CS8-5
LT1521IS8
LT1521IS8-3
LT1521IS8-3.3
LT1521IS8-5
S8 PART MARKING
1521
15213
152133
15215
1521I
1521I 3
1521I 33
1521I 5
FRONT VIEW
1 OUT
TAB IS
GND
2 GND
3 IN
ST PACKAGE
3-LEAD PLASTIC SOT-223
TJMAX = 125 °C, θJA = 50°C/ W
SEE THE APPLICATIONS INFORMATION SECTION
ORDER PART NUMBER
LT1521CST-3
LT1521CST-3.3
LT1521CST-5
LT1521IST-3
LT1521IST-3.3
LT1521IST-5
ST PART MARKING
15213
152133
15215
1521I 3
1521I 33
1521I 5
2


Part Number LT1521
Description 300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown
Maker Linear Technology
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LT1521 Datasheet PDF






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