LT1529-3.3_15 Datasheet, PDF (1/12 Pages) Linear Technology – 3A Low Dropout Regulators with Micropower Quiescent Current and Shutdown

FEATURES
■ _{Dropout Voltage: 0.6V at IOUT = 3A}
■ _{Output Current: 3A}
■ _{Quiescent Current: 50µA}
■ _{No Protection Diodes Needed}
■ _{Adjustable Output from 3.8V to 14V}
■ _{3.3V and 5V Fixed Output Voltages}
■ _{Controlled Quiescent Current in Dropout}
■ _{Shutdown IQ = 16µA}
■ _{Stable with 22µF Output Capacitor}
■ _{Reverse Battery Protection}
■ _{No Reverse Current}
■ _{Thermal Limiting}
U
APPLICATIO S
■ _{High Efficiency Regulator}
■ _{Regulator for Battery-Powered Systems}
■ _{Post Regulator for Switching Supplies}
■ _{5V to 3.3V Logic Regulator}
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LT1529
LT 1529-3.3/LT 1529-5
3A Low Dropout Regulators
with Micropower
Quiescent Current
and Shutdown
DESCRIPTIO
The LT^®1529/LT1529-3.3/LT1529-5 are 3A low dropout
regulators with micropower quiescent current and shut-
down. The devices are capable of supplying 3A of output
current with a dropout voltage of 0.6V. Designed for use
in battery-powered systems, the low quiescent current,
50µA operating and 16µA in shutdown, make 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 LT1529 /LT1529-3.3/LT1529-5 in-
clude the ability to operate with small output capacitors.
They are stable with 22µF on the output while most older
devices require up to 100µF for stability. Small ceramic
capacitors can be used, enhancing manufacturabiltiy.
Also the input may be connected to voltages lower than the
output voltage, including negative voltages, without re-
verse current flow from output to input. This makes the
LT1529/LT1529-3.3/LT1529-5 ideal for backup power
situations where the output is held high and the input is at
ground or reversed. Under these conditions, only 16µA
will flow from the OUTPUT pin to ground. The devices are
available in 5-lead TO-220 and 5-lead DD packages.
TYPICAL APPLICATIO
5V Supply with Shutdown
V_IN > 5.5V
5
1
V_IN OUTPUT
LT1529-5
4
2
SHDN SENSE
GND
3
5V
+
3A
22µF
V_SHDN (PIN 4)
< 0.25
> 2.8
NC
OUTPUT
OFF
ON
ON
LT1529 • TA01
Dropout Voltage
0.6
0.5
0.4
0.3
0.2
0.1
0
0 0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT CURRENT (A)
LT1529 • TA02
152935fb
1