LT3470A

1

3470afa

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Micropower Buck Regulator

with Integrated Boost and

Catch Diodes

verter that integrates a 440mA power switch, catch diode

and boost diode into low profile 2mm

× 3mm DFN

package. The LT3470A combines Burst Mode and

continuous operation to allow the use of tiny inductor

and capacitors while providing a low ripple output to

loads of up to 250mA.

With its wide input range of 4V to 40V, the LT3470A can

regulate a wide variety of power sources, from 2-cell Li-Ion

batteries to unregulated wall transformers and lead-acid

batteries. Quiescent current in regulation is just 35μA in

a typical application while a zero current shutdown mode

disconnects the load from the input source, simplifying

power management in battery-powered systems. Fast cur-

rent limiting and hysteretic control protects the LT3470A

and external components against shorted outputs, even

at 40V input. The LT3470A has higher output current and

improved start-up and dropout performance compared

to the LT3470.

Efficiency and Power Loss vs Load Current

– Continuous Operation at Higher Loads

× 3mm Thermally

Enhanced 8-Lead DFN Package

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

is a registered trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

BOOST

LT3470A

SW

SHDN

0.22μF

22pF

22μF

2.2μF

5.7V TO 40V

5V

250mA

604k

1%

200k

1%

33μH

BIAS

FB

GND

OFF ON

3470a TA01

LOAD CURRENT (mA)

30

40

60

80

90

0.1

10

100

300

3470a TA02

20

1

70

50

10

1

1000

100

10

0.1