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| Parameters |
|---|
■Low Resistance Pass Transistor: 0.25Ω
■ Dropout Voltage: 0.75V at 3A
■±1% Reference Voltage
■ Accurate Programmable Current Limit
■ Shutdown Capability
■ Internal Reference Available
■ Full Remote Sense
■ Low Quiescent Current: 2.5mA
■ Good High Frequency Ripple Rejection
■ Available in 5-Lead TO-220 and DD Packages
DESCRIPTION
The LT®1185 is a 3A low dropout regulator with adjustable
current limit and remote sense capability. It can be used as
a positive output regulator with floating input or as a
standard negative regulator with grounded input. The
output voltage range is 2.5V to 25V, with ±1% accuracy on
the internal reference voltage.
The LT1185 uses a saturation-limited NPN transistor as
the pass element. This device gives the linear dropout
characteristics of a FET pass element with significantly
less die area. High efficiency is maintained by using special
anti-saturation circuitry that adjusts base drive to track
load current. The “on resistance” is typically 0.25Ω.
Accurate current limit is programmed with a single 1/8W
external resistor, with a range of zero to three amperes. A
second, fixed internal limit circuit prevents destructive
currents if the programming current is accidentally overranged.
Shutdown of the regulator output is guaranteed
when the program current is less than 1µA, allowing
external logic control of output voltage.
The LT1185 has all the protection features of previous
LTC regulators, including power limiting and thermal
shutdown.
Please send RFQ , we will respond immediately.