LT3095

1

3095fa

For more information www.linear.com/LT3095

TYPICAL APPLICATION

FEATURES

DESCRIPTION

Dual-Channel Low Noise

Bias Generators

The LT®3095 generates two low noise bias supplies from

a common input voltage ranging from 3V to 20V. Each

channel includes a fixed frequency, peak current-mode

step-up switching regulator and a low noise, single-

resistor-programmable 50mA linear regulator. The linear

regulator’s high power supply ripple rejection (PSRR)

combined with its low noise performance results in less

Eachboostregulatoradjustsitsoutputvoltageto2Vabove

the corresponding linear regulator’s output voltage, opti-

mizing power dissipation, PSRR and transient response.

This tracking scheme, along with internal boost regulator

frequency compensation and integrated Schottky diodes,

minimizesexternalcomponentcountandsimplifiessystem

design.Eachlinearregulatorincludesinternalcurrentlimit

and thermal limit protection circuitry.

The LT3095 switching frequency is externally program-

mable with a single resistor from 450kHz to 2MHz. A

SYNC pin allows synchronization to an external clock. The

LT3095 is available in a thermally enhanced, low profile

(0.75mm) 24-lead 3mm × 5mm QFN package.

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Output Ripple

APPLICATIONS

n

Generates Two Independent Low Noise Bias Supplies

n

Boost Regulator:

n

Wide Input Voltage Range: 3V to 20V

n

Adjustable Switching Frequency: 450kHz to 2MHz

n

Synchronizable to External Clock

n

950mA Power Switches

n

Integrated Schottky Diodes

n

Internal Frequency Compensation

n

Linear Regulator:

n

Wide Output Voltage Range: 1V to 20V

n

SET Pin Reference Current: 50µA

n

n

High Frequency PSRR: 72dB at 1MHz

n

Independent Precision-Threshold Enable Pins

n

Symmetric Pinout Simplifies PCB Layout

n

Thermally Enhanced 3mm × 5mm 24-Lead

QFN Package

n

Noise-Sensitive USB Powered Applications

n

Data Conversion, Industrial Supplies, RF

n

Instrumentation Amplifiers

6.8µH

2.2µF

100k

10µF

2.2µF

1µF

100k

10µH

300k

10µF

2.2µF

1µF

0.1µF

EN1

SW1

GND

BSTOUT1

LDOIN1

OUT1

SET1

RT

GND

IN

EN2

SW2

GND

BSTOUT2

LDOIN2

OUT2

SET2

GND

3V to 7V

LT3095

5V, 50mA

15V, 50mA

SYNC

3095 TA01a

1µs/DIV

20mV/DIV

50µV/DIV

3095 G03

20MHz BW