lt3480emse-trpbf Linear Technology Corporation, lt3480emse-trpbf Datasheet

lt3480emse-trpbf

Manufacturer Part Number

lt3480emse-trpbf

Description

38v, 2a, 2.4mhz Step-down Switching Regulator With 70?a Quiescent Current

Manufacturer

Linear Technology Corporation

Datasheet

1.LT3480EMSE-TRPBF.pdf (24 pages)

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FEATURES

APPLICATIONS

TYPICAL APPLICATION

Wide Input Range:

Operation from 3.6V to 36V

Over-Voltage Lockout Protects Circuits

through 60V Transients

2A Maximum Output Current

Low Ripple Burst Mode

Adjustable Switching Frequency: 200kHz to 2.4MHz

Low Shutdown Current: IQ < 1μA

Integrated Boost Diode

Synchronizable Between 250kHz to 2MHz

Power Good Flag

Saturating Switch Design: 0.25 On-Resistance

0.790V Feedback Reference Voltage

Output Voltage: 0.79V to 20V

Soft-Start Capability

Small 10-Pin Thermally Enhanced MSOP and

(3mm × 3mm) DFN Packages

Automotive Battery Regulation

Power for Portable Products

Distributed Supply Regulation

Industrial Supplies

4.5V TO 36V

TRANSIENT

70μA IQ at 12VIN to 3.3VOUT

Output Ripple < 15mV

TO 60V

4.7μF

470pF

40.2k

OFF ON

14k

3.3V Step-Down Converter

RUN/SS

SYNC

Operation

LT3480

GND

BOOST

0.47μF

100k

316k

4.7μH

3480 TA01

22μF

3.3V

OUT

36V, 2A, 2.4MHz Step-Down

DESCRIPTION

The LT

2.4MHz) monolithic buck switching regulator that ac-

cepts input voltages up to 36V (60V maximum). A high

efﬁ ciency 0.25 switch is included on the die along with

a boost Schottky diode and the necessary oscillator, con-

trol, and logic circuitry. Current mode topology is used

for fast transient response and good loop stability. Low

ripple Burst Mode operation maintains high efﬁ ciency at

low output currents while keeping output ripple below

15mV in a typical application. In addition, the LT3480 can

further enhance low output current efﬁ ciency by draw-

ing bias current from the output when V

Shutdown reduces input supply current to less than 1μA

while a resistor and capacitor on the RUN/SS pin provide a

controlled output voltage ramp (soft-start). A power good

ﬂ ag signals when V

output voltage. The LT3480 is available in 10-Pin MSOP

and 3mm × 3mm DFN packages with exposed pads for

low thermal resistance.

Burst Mode is a registered trademark of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

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

Switching Regulator with

70µA Quiescent Current

3480 is an adjustable frequency (200kHz to

100

OUT

reaches 86% of the programmed

0.5

Efﬁ ciency

LOAD CURRENT (A)

OUT

1.0

= 3.3V

= 5V

1.5

L = 5.6μH

F = 800 kHz

= 12V

3480 TA01b

OUT

LT3480

is above 3V.

3480fb

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