LT3027 データシートの表示（PDF） - Linear Technology

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LT3027

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

Linear Technology 

FEATURES

■ Low Noise: 20µVRMS (10Hz to 100kHz)

■ Low Quiescent Current: 25µA/Channel

■ Independent Inputs

■ Wide Input Voltage Range: 1.8V to 20V

■ Output Current: 100mA/Channel

■ Very Low Shutdown Current: <0.1µA

■ Low Dropout Voltage: 300mV at 100mA

■ Adjustable Output from 1.22V to 20V

■ Stable with 1µF Output Capacitor

■ Stable with Aluminum, Tantalum or

Ceramic Capacitors

■ Reverse Battery Protected

■ No Protection Diodes Needed

■ Overcurrent and Overtemperature Protected

■ Thermally Enhanced 10-Lead MSOP and DFN

Packages

U

APPLICATIO S

■ Cellular Phones

■ Pagers

■ Battery-Powered Systems

■ Frequency Synthesizers

■ Wireless Modems

LT3027

Dual 100mA,

Low Dropout, Low Noise,

Micropower Regulator with

Independent Inputs

DESCRIPTIO

The LT®3027 is a dual, micropower, low noise, low drop-

out regulator with independent inputs. With an external

0.01µF bypass capacitor, output noise is a low 20µVRMS

over a 10Hz to 100kHz bandwidth. Designed for use in

battery-powered systems, the low 25µA quiescent current

per channel makes it an ideal choice. In shutdown, quies-

cent current drops to less than 0.1µA. Shutdown control

is independent for each channel, allowing for flexibility in

power management. The device is capable of operating

over an input voltage from 1.8V to 20V, and can supply

100mA of output current from each channel with a drop-

out voltage of 300mV. Quiescent current is well controlled

in dropout.

The LT3027 regulator is stable with output capacitors as

low as 1µF. Small ceramic capacitors can be used without

the series resistance required by other regulators.

Internal protection circuitry includes reverse battery pro-

tection, current limiting and thermal limiting protection.

The device is available as an adjustable device with a

1.22V reference voltage. The LT3027 regulator is available

in the thermally enhanced 10-lead MSOP and low profile

(0.75mm) 3mm × 3mm DFN packages.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Protected by U.S. Patents, including 6118263, 6144250.

TYPICAL APPLICATIO

3.3V/2.5V Low Noise Regulators

VIN1

3.7V TO

20V

VIN2

2.9V TO

20V

IN1

OUT1

1µF

SHDN1

BYP1

ADJ1

LT3027

IN2

OUT2

1µF

SHDN2

BYP2

ADJ2

GND

0.01µF 422k

249k

0.01µF 261k

249k

3.3V AT 100mA

20µVRMS NOISE

10µF

2.5V AT 100mA

20µVRMS NOISE

10µF

3027 TA01

10Hz to 100kHz Output Noise

VOUT

100µV/DIV

20µVRMS

3027 TA01b

3027f

1

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