LT3048 Series

1

3048fa

For more information www.linear.com/LT3048

TYPICAL APPLICATION

FEATURES

DESCRIPTION

Low Noise Bias Generator

in 2mm × 2mm DFN

The LT®3048 series generate low noise, low ripple bias

supplies from input voltages of 2.7V to 4.8V.

The LT3048 includes a boost regulator and a LDO linear

regulator. The boost regulator provides power to the

linear regulator.

The boost regulator output voltage is regulated to 1.1V

above the LDO output, optimizing LDO ripple rejection and

transient response. Fixed frequency operation and current

mode control allow the use of very small inductors and

results in low, predictable output ripple.

The linear regulator in the LT3048 generates a program-

mable output and the LT3048-XX generate fixed output

voltages. High power supply ripple rejection combined

with a low noise internal reference results in less than

The LT3048 is available in a 8-lead 2mm × 2mm DFN

package.

APPLICATIONS

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Generates Low Noise Bias Voltage from Single

Cell Li-Ion Battery

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Output Current: Up to 40mA

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Boost Regulator

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1MHz Operation (LT3048)

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2.2MHz Operation (LT3048-XX)

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Integrated Schottky Diode

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Low Dropout Linear Regulator

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1.235V Feedback Voltage (LT3048)

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0.1% Load Regulation

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Fixed 3.3V, 5V, 12V, 15V and Adjustable Output Options

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Short-Circuit and Thermal Protection

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Load Disconnect in Shutdown

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Available in 2mm × 2mm DFN Package

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Sensor Bias

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Op Amp Supply

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.

BSTOUT

SW

LDOIN

LT3048-15

10µH

LDOOUT

EN

1nF

1µF

1µF

3048 TA01a

4.7µF

IN

2.7V TO 4.8V

OUT

15V

BYP

OFF ON

GND

2.7

3.3

3.6

19

22

24

LOAD CURRENT (mA)

0

30

40

50

15

25

3048 TA01b

20

10

0

5

10

20

60

70

80

LDOOUT = 15V

L = 10µH

DCR = 650m

Efficiency