LT1129IS8-3.3
Micropower Low Dropout Regulators with Shutdown

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Datasheet

Size: 276.02KB
Page: 12
PDF: LT1129IS8-3.3.pdf
  • Description:
    Micropower Low Dropout Regulators with Shutdown
  • MFG:
    LINER [Linear Technology]
 

Abstract


1
LT1129/LT1129-3.3/LT1129-5
Micropower Low Dropout
Regulators with Shutdown
U
A
O
PPLICATITYPICAL
OUTPUT CURRENT (A)
0
DROPOUT VOLTAGE (V)
0.4
0.5
0.6
0.3 0.5
0.3
0.2
0.1 0.2 0.4 0.6 0.7
0.1
0
LT1129 ? TA02
Dropout Voltage5V Supply with Shutdown
D
U
ESCRIPTIOS
FEATURE
The LT1129/LT1129-3.3/LT1129-5 are micropower low
dropout regulators with shutdown. The devices are ca-
pable of supplying 700mA of output current with a drop-
out voltage of 0.4V at maximum output. Designed for use
in battery-powered systems the low quiescent current,
50?A operating and 16?A in shutdown, make them
an ideal choice. The quiescent current does not rise
in dropout as it does with many other low dropout
PNP regulators.
Other features of the LT1129 /LT1129-3.3/LT1129-5 in-
clude the ability to operate with small output capacitors.
They are stable with only 3.3?F on the output while most
older devices require between 10?F and 100?F for stabil-
ity. Also the input may be connected to ground or a reverse
voltage without reverse current flow from output to input.
This makes the LT1129/LT1129-3.3/LT1129-5 ideal for
backup power situations where the output is held high and
the input is at ground or reversed. Under these conditions,
only 16?A will flow from the output pin to ground. The
devices are available in 5-lead TO-220, 5-lead DD, and
3-lead SOT-223 packages.
n
0.4V Dropout Voltage
n
700mA Output Current
n
50?A Quiescent Current
n
No Protection Diodes Needed
n
Adjustable Output from 3.8V to 30V
n
3.3V and 5V Fixed Output Voltages
n
Controlled Quiescent Current in Dropout
n
Shutdown
n
16?A Quiescent Current in Shutdown
n
Stable with 3.3?F Output Capacitor
n
Reverse Battery Protection
n
No Reverse Output Current
n
Thermal Limiting
n
Surface Mount
U
SA
O
PPLICATI
n
Low Current Regulator
n
Regulator for Battery-Powered Systems
n
Post Regulator for Switching Supplies
n
5V to 3.3V Logic Regulator
IN OUT
LT1129-5
GND
5V OUT
500mA
V
IN
> 5.5V
3.3?F
SOLID TANTALUM
+
SENSE
LT1129 ? TA01
V
SHDN
(PIN 4)
< 0.25
> 2.8
NC
OUTPUT
OFF
ON
ON
SHDN
1
2
3
4
5

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