LT1521CS85PBF Linear Technology Corporation, LT1521CS85PBF Datasheet

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LT1521CS85PBF

Manufacturer Part Number
LT1521CS85PBF
Description
SOP8
Manufacturer
Linear Technology Corporation
Datasheet

Specifications of LT1521CS85PBF

Date_code
09+
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Dropout Voltage: 0.5V
Output Current: 300mA
Quiescent Current: 12 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
Reverse Battery Protection
No Reverse Current
Thermal Limiting
Low Current Regulator
Regulator for Battery-Powered Systems
Post Regulator for Switching Supplies
6V
5V Battery-Powered Supply with Shutdown
Q
1 F
= 6 A
8
5
U
V
IN
SHDN
SHDN
<0.25
>2.80
NC
LT1521-5
(PIN 5) OUTPUT
GND
3
SENSE
OUT
OFF
ON
ON
U
1
2
Quiescent Current and Shutdown
+
LT1521 • TA01
1.5 F
5V
300mA
Regulators with Micropower
DESCRIPTIO
The LT
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, 12 A operating and 6 A 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 1.5 F on the
output while most older devices require between 10 F and
100 F 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 5 A
will flow from the output pin to ground.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1521/LT1521-3/LT1521-3.3/LT1521-5 are low
0.6
0.5
0.1
0.4
0.3
0.2
300mA Low Dropout
0
0
50
U
Dropout Voltage
OUTPUT CURRENT (mA)
LT1521-3.3/LT1521-5
100
150
LT1521/LT1521-3
200
250
LT1521 • TA02
300
1521335fb
1

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