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LT1121AHVIS8 Datasheet

  • LT1121AHVIS8

  • Positive Adjustable Voltage Regulator

  • 16頁

  • ETC

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LT1121/LT1121-3.3/LT1121-5
Micropower Low Dropout
Regulators with Shutdown
FEATURES
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DESCRIPTIO
0.4V Dropout Voltage
150mA Output Current
30碌A Quiescent Current
No Protection Diodes Needed
Adjustable Output from 3.8V to 30V
3.3V and 5V Fixed Output Voltages
Controlled Quiescent Current in Dropout
Shutdown
16碌A Quiescent Current in Shutdown
Stable with 0.33碌F Output Capacitor
Reverse Battery Protection
No Reverse Current with Input Low
Thermal Limiting
The LT
廬
1121/LT1121-3.3/LT1121-5 are micropower low
dropout regulators with shutdown. These devices are
capable of supplying 150mA of output current with a
dropout voltage of 0.4V. Designed for use in battery-
powered systems, the low quiescent current, 30碌A oper-
ating and 16碌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 LT1121/LT1121-3.3/LT1121-5 in-
clude the ability to operate with very small output capaci-
tors. They are stable with only 0.33碌F on the output while
most older devices require between 1碌F and 100碌F for
stability. Small ceramic capacitors can be used, enhancing
manufacturability. Also the input may be connected to
ground or a reverse voltage without reverse current flow
from output to input. This makes the LT1121 series ideal
for backup power situations where the output is held high
and the input is at ground or reversed. Under these
conditions only 16碌A will flow from the output pin to
ground.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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Low Current Regulator
Regulator for Battery-Powered Systems
Post Regulator for Switching Supplies
TYPICAL APPLICATIO
8
1
5V Battery-Powered Supply with Shutdown
0.5
IN
OUT
LT1121-3.3
5
SHDN
GND
3
3.3V
OUT
150mA
DROPOUT VOLTAGE (V)
5V
+
0.4
1碌F
SOLID TANTALUM
0.3
0.2
V
SHDN
(PIN 5) OUTPUT
<0.25
OFF
>2.8
ON
NC
ON
0.1
LT1121 鈥?TA01
0
0
20
U
Dropout Voltage
40 60 80 100 120 140 160
OUTPUT CURRENT (mA)
LT1121 鈥?TA02
U
U
1

LT1121AHVIS8 產(chǎn)品屬性

  • LT1121/-3.3/-5

  • 100

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 線性

  • -

  • 正，可調式

  • 3.75 V ~ 30 V

  • 4.17 V ~ 30 V

  • 0.42V @ 150mA

  • 1

  • 150mA

  • -40°C ~ 125°C

  • 表面貼裝

  • 8-SOIC（0.154"，3.90mm 寬）

  • 8-SOIC

  • 管件

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