LT1580C datasheet(5/16 Pages) LINER

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LT1580/LT1580-2.5

TYPICAL PERFORMANCE CHARACTERISTICS

TEMPERATURE (

°C)

–50 –25

150

1580 G05

125

100

2.508

2.506

2.504

2.502

2.500

2.498

2.496

2.494

2.492

TEMPERATURE (

°C)

–50 –25

150

1580 G04

125

100

1.258

1.256

1.254

1.252

1.250

1.248

1.246

1.244

1.242

LT1580 Reference Voltage

vs Temperature

400mA

LT1580-2.5 Output Voltage

vs Temperature

VOUT

50mV/DIV

LOAD

µs/DIV

1580 TA02

Load Current Step Response

PIN FUNCTIONS (5-Lead/7-Lead)

SENSE (Pin 1): This pin is the positive side of the reference

voltage for the device. With this pin it is possible to Kelvin

sense the output voltage at the load.

ADJ (Pin 2/5): This pin is the negative side of the

reference voltage for the device. Transient response can

be improved by adding a small bypass capacitor from the

ADJ pin to ground. For fixed voltage devices the ADJ pin

is also brought out to allow the user to add a bypass

capacitor.

GND (Pin 2, 7-Lead Only): For fixed voltage devices this

is the bottom of the resistor divider that sets the output

voltage.

VPOWER (Pin 5/6): This is the collector to the power device

of the LT1580. The output load current is supplied through

this pin. For the device to regulate, the voltage at this pin

must be between 0.1V and 0.8V greater than the output

voltage (see Dropout specifications).

VCONTROL (Pin 4/3): This pin is the supply pin for the

control circuitry of the device. The current flow into this

pin will be about 1% of the output current. For the device

to regulate, the voltage at this pin must be between 1.0V

and 1.3V greater than the output voltage (see Dropout

specifications).

VOUT (Pin 3/4): This is the power output of the device.

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