LT3027 查看數據表（PDF） - Linear Technology

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LT3027

Dual 100mA, Low Dropout, Low Noise, Micropower Regulator with Independent Inputs

Linear Technology 

LT3027

PI FU CTIO S

ADJ1/ADJ2 (Pins 4/2): Adjust Pin. These are the inputs to

the error amplifiers. These pins are internally clamped to

±7V. They have a bias current of 30nA which flows into the

pin (see curve of ADJ1/ADJ2 Pin Bias Current vs Tempera-

ture in the Typical Performance Characteristics section).

The ADJ1 and ADJ2 pin voltage is 1.22V referenced to

ground and the output voltage range is 1.22V to 20V.

BYP1/BYP2 (Pins 5/1): Bypass. The BYP1/BYP2 pins are

used to bypass the reference of the LT3027 regulator to

achieve low noise performance from the regulator. The

BYP1/BYP2 pins are clamped internally to ±0.6V (one

VBE) from ground. A small capacitor from the correspond-

ing output to this pin will bypass the reference to lower the

output voltage noise. A maximum value of 0.01µF can be

used for reducing output voltage noise to a typical 20µVRMS

over a 10Hz to 100kHz bandwidth. If not used, this pin

must be left unconnected.

OUT1/OUT2 (Pins 6/10): Output. The outputs supply

power to the loads. A minimum output capacitor of 1µF is

required to prevent oscillations. Larger output capacitors

will be required for applications with large transient loads

to limit peak voltage transients. See the Applications

Information section for more information on output ca-

pacitance and reverse output characteristics.

SHDN1/SHDN2 (Pins 7/3): Shutdown. The SHDN1/SHDN2

pins are used to put the corresponding channel of the

LT3027 regulator into a low power shutdown state. The

output will be off when the pin is pulled low. The

SHDN1/SHDN2 pins can be driven either by 5V logic or

open-collector logic with pull-up resistors. The pull-up

resistors are required to supply the pull-up current of the

open-collector gates, normally several microamperes,

and the SHDN1/SHDN2 pin current, typically 1µA. If

unused, the pin must be connected to VIN. The device will

not function if the SHDN1/SHDN2 pins are not connected.

IN1/IN2 (Pins 8/9): Inputs. Power is supplied to the device

through the IN pins. 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 1µF to 10µF is sufficient. The

LT3027 regulator is designed to withstand reverse volt-

ages on the IN pin with respect to ground and the OUT pin.

In the case of a reverse input, which can happen if a battery

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

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

current flow into the regulator and no reverse voltage will

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

the load.

Exposed Pad (Pin 11): Ground. This pin must be soldered

to the PCB and electrically connected to ground.

3027f

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