LT3010 datasheet(7/16 Pages) LINER

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LT3010/LT3010-5

3010f

OUT (Pin 1): Output. The output supplies power to the

load. A minimum output capacitor of 1

µF is required to

prevent oscillations. Larger output capacitors will be re-

quired for applications with large transient loads to limit

peak voltage transients. See the Applications Information

section for more information on output capacitance and

reverse output characteristics.

SENSE (Pin 2): Sense. For the LT3010-5, the SENSE pin

is the input to the error amplifier. Optimum regulation will

be obtained at the point where the SENSE pin is connected

to the OUT pin of the regulator. In critical applications,

small voltage drops are caused by the resistance (RP) of

PC traces between the regulator and the load. These may

be eliminated by connecting the SENSE pin to the output

at the load as shown in Figure 1 (Kelvin Sense Connec-

tion). Note that the voltage drop across the external PC

traces will add to the dropout voltage of the regulator. The

SENSE pin bias current is 10

µAatthenominalratedoutput

voltage.

ADJ (Pin 2): Adjust. For the adjustable LT3010, this is the

input to the error amplifier. This pin is internally clamped

±7V. It has a bias current of 50nA which flows into the

pin (see curve of ADJ Pin Bias Current vs Temperature in

the Typical Performance Characteristics). The ADJ pin

voltage is 1.275V referenced to ground, and the output

voltage range is 1.275V to 60V.

GND (Pin 4, Tab): Ground. The exposed backside of the

package is an electrical connection for GND. As such, to

ensure optimum device operation, the exposed pad must

be connected directly to pin 4 on the PC board.

SHDN (Pin 5): Shutdown. The SHDN pin is used to put the

LT3010 into a low power shutdown state. The output will

be off when the SHDN pin is pulled low. The SHDN pin can

be driven either by 5V logic or open-collector logic with a

pull-up resistor. The pull-up resistor is only required to

supply the pull-up current of the open-collector gate,

normally several microamperes. If unused, the SHDN pin

can be left open circuit. The device will be active, output

on, if the SHDN pin is not connected.

IN (Pin 8): Input. Power is supplied to the device through

the IN pin. A bypass capacitor is required on this pin if the

device is more than six inches away from the main input

filter capacitor. In general, the output impedance of a

battery rises with frequency, so it is advisable to include a

bypass capacitor in battery-powered circuits. A bypass

capacitor in the range of 1

µF to 10µF is sufficient. The

LT3010 is designed to withstand reverse voltages on the

IN pin with respect to ground and the OUT pin. In the case

of a reversed input, which can happen if a battery is

plugged in backwards, the LT3010 will act as if there is a

diode in series with its input. There will be no reverse

current flow into the LT3010 and no reverse voltage will

appear at the load. The device will protect both itself and

the load.

PI FU CTIO S

SHDN

LT3010

VIN

OUT

SENSE

GND

4, TAB

3010 F01

LOAD

Figure 1. Kelvin Sense Connection

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