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LT3028

Dual 100mA/500mA Low Dropout, Low Noise, Micropower Regulators with Independent Inputs

Linear Technology 

FEATURES

■ Low Noise: 20µVRMS (10Hz to 100kHz)

■ Low Quiescent Current: 30µA/Output

■ Independent Inputs

■ Wide Input Voltage Range: 1.8V to 20V

■ Output Current: 100mA/500mA

■ Very Low Shutdown Current: <0.1µA

■ Low Dropout Voltage: 300mV/320mV at

100mA/500mA

■ Adjustable Outputs from 1.22V to 20V

■ Stable with as Low as 1µF/3.3µF Output Capacitor

■ Stable with Aluminum, Tantalum or

Ceramic Capacitors

■ Reverse-Battery Protected

■ No Protection Diodes Needed

■ Overcurrent and Overtemperature Protected

■ Tracking/Sequencing Capability

■ Thermally Enhanced 16-Lead TSSOP and 16-Lead

(5mm × 3mm) DFN Packages

U

APPLICATIO S

■ Cellular Phones

■ Pagers

■ Battery-Powered Systems

■ Frequency Synthesizers

■ Wireless Modems

■ Tracking/Sequencing Power Supplies

LT3028

Dual 100mA/500mA

Low Dropout, Low Noise,

Micropower Regulators with

Independent Inputs

DESCRIPTIO

The LT®3028 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 30µA quiescent current

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

cent current drops to less than 0.1µA. Shutdown control

is independent for each output, allowing for flexibility in

power management. The device is capable of operating

over an input voltage range of 1.8V to 20V. Output 1 can

supply 500mA of output current with a dropout voltage of

320mV. The device can supply 100mA of output current

from Output 2 with a dropout voltage of 300mV. Quiescent

current is well controlled in dropout.

The LT3028 regulator is stable with output capacitors as

low as 1µF for the 100mA output and 3.3µF for the 500mA

output. 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 LT3028 regulator is available in the

thermally enhanced 16-lead TSSOP and 16-lead, low

profile (5mm × 3mm × 0.75mm) DFN packages.

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

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

TYPICAL APPLICATIO

VIN1

3.7V TO

20V

VIN2

2.9V TO

20V

3.3V/2.5V Low Noise Regulators

IN1

OUT1

1µF

SHDN1

BYP1

ADJ1

LT3028

OUT2

IN2

1µF

SHDN2 BYP2

ADJ2

GND

0.01µF 422k

3.3V AT 500mA

10µF 20µVRMS NOISE

249k

0.01µF 261k

2.5V AT 100mA

20µVRMS NOISE

10µF

249k

3028 TA01a

10Hz to 100kHz Output Noise

VOUT

100µV/DIV

20µVRMS

3028 TA01b

3028f

1

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