lt3970-3.3 Linear Technology Corporation, lt3970-3.3 Datasheet

lt3970-3.3

Manufacturer Part Number

lt3970-3.3

Description

40v, 350ma Step-down Regulator With 2.5?a Quiescent Current And Integrated Diodes Features

Manufacturer

Linear Technology Corporation

Datasheet

1.LT3970-3.3.pdf (22 pages)

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APPLICATIONS

TYPICAL APPLICATION

FEATURES

6V TO 40V

Low Ripple Burst Mode

Wide Input Voltage Range: 4.2V to 40V Operating

Adjustable Switching Frequency: 200kHz to 2.2MHz

Integrated Boost and Catch Diodes

350mA Output Current

Fixed Output Voltages: 3.3V, 5V

Accurate 1V Enable Pin Threshold

Low Shutdown Current: I

Internal Sense Limits Catch Diode Current

Power Good Flag

Output Voltage: 1.21V to 25V

Internal Compensation

Small 10-Pin MSOP and (3mm × 2mm) DFN Packages

Automotive Battery Regulation

Power for Portable Products

Industrial Supplies

2.2μF

2.5μA I

Output Ripple < 5mV

1.8μA I

f = 600kHz

OFF ON

226k

at 12V

5V Step-Down Converter

LT3970

GND

to 3.3V

BOOST

P-P

Operation

= 0.7μA

OUT

0.22μF

22pF

22μH

3490 TA01a

316k

22μF

350mA

OUT

DESCRIPTION

The LT

switching regulator that accepts a wide input voltage

range up to 40V, and consumes only 2.5μA of quiescent

current. A high efﬁ ciency switch is included on the die

along with the catch diode, boost diode, and the neces-

sary oscillator, control and logic circuitry. Low ripple Burst

Mode operation maintains high efﬁ ciency at low output

currents while keeping the output ripple below 5mV in a

typical application. Current mode topology is used for fast

transient response and good loop stability. A catch diode

current limit provides protection against shorted outputs

and overvoltage conditions. An enable pin with accurate

threshold is available, producing a low shutdown current

of 0.7μA. A power good ﬂ ag signals when V

90% of the programmed output voltage. The LT3970 is

available in small 10-pin MSOP and 3mm × 2mm DFN

packages.

L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks

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

owners.

LT3970/LT3970-3.3/LT3970-5

40V, 350mA Step-Down

Quiescent Current and

3970 is an adjustable frequency monolithic buck

0.01

Regulator with 2.5µA

= 12V

Integrated Diodes

0.1

LOAD CURRENT (mA)

Efﬁ ciency

100

3970 TA01b

1000

100

0.1

0.01

OUT

reaches

3970fa

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