lt3500edd-trpbf Linear Technology Corporation, lt3500edd-trpbf Datasheet

lt3500edd-trpbf

Manufacturer Part Number

lt3500edd-trpbf

Description

Monolithic 2a Step-down Regulator Plus Linear Regulator/controller

Manufacturer

Linear Technology Corporation

Datasheet

1.LT3500EDD-TRPBF.pdf (24 pages)

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FEATURES

APPLICATIONS

TYPICAL APPLICATION

6V TO 36V

Wide Input Range: 3V to 36V Operating,

40V Maximum

Short-Circuit Protected Over Full Input Range

2A Output Current Capability

Adjustable/Synchronizable Fixed Frequency

Operation from 250kHz to 2.2MHz

Soft-Start/Tracking Capability

Output Adjustable Down to 0.8V

Adjustable Linear Regulator/Driver with 13mA

Output Capability

Power Good Comparator with Complimentary

Outputs

Low Shutdown Current: 12μA

Thermally Enhanced 3mm × 3mm DFN Package

Automotive Battery Regulation

Industrial Control

Wall Transformer Regulation

Distributed Power Regulation

0.47μF

53.6k

2.2μF

330pF

40.2k

Dual Step-Down Converters

SHDN

SYNC

LT3500

LDRV

BST

LFB

8.06k

0.47μF

B240A

24.9k

6.8μH

42.2k

8.06k

3500 TA01a

22μF

3.3V

OUT2

22μF

OUT1

Switching Converter Efﬁ ciency

FREQUENCY = 800kHz

OUT2

0.2

= 12V

= 0A

0.4

0.6

LOAD CURRENT (A)

DESCRIPTION

0.8

The LT

converter with an internal 2.3A switch. The wide input range

of 3V to 40V makes the LT3500 suitable for regulating

power from a wide variety of sources, including automo-

tive batteries, 24V industrial supplies and unregulated

wall adapters.

Resistor-programmable 250kHz to 2.2MHz frequency

range and synchronization capability enable optimization

between efﬁ ciency and external component size. Cycle-

by-cycle current limit, frequency foldback and thermal

shutdown provide protection against a shorted output.

The soft-start feature controls the ramp rate of the output

voltage, eliminating input current surge during start-up,

and also provides output tracking.

The LT3500 contains an internal NPN transistor with feed-

back control which can be conﬁ gured as a linear regulator

or as a linear regulator controller.

The LT3500’s low current shutdown mode (<12μA) enables

easy power management in battery-powered systems.

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

All other trademarks are the property of their respective owners.

Monolithic 2A Step-Down

1.0

1.2

1.4

3500 is a current mode PWM step-down DC/DC

1.6

3500 TA01b

Regulator Plus Linear

1.8

Regulator/Controller

2.0

OUT2

OUT1

AC COUPLED

= 3.3V AT 1A

= 5V AT 1A

2mV/DIV

Output Voltage Ripple

500ns/DIV

LT3500

3500 TA01c

3500fa

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