LT3680IDD(RevA) 데이터 시트보기 (PDF) - Linear Technology

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LT3680IDD
(Rev.:RevA)

36V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75µA Quiescent Current

Linear Technology 

LT3680

36V, 3.5A, 2.4MHz

Step-Down Switching Regulator

with 75µA Quiescent Current

FEATURES

■ Wide Input Voltage Range: 3.6V to 36V

■ 3.5A Maximum Output Current

■ Low Ripple (<15mVP-P) Burst Mode® Operation:

IQ = 75μA at 12VIN to 3.3VOUT

■ 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: 95m On-Resistance

■ 0.790V Feedback Reference Voltage

■ Output Voltage: 0.79V to 30V

■ Thermal Protection

■ Soft-Start Capability

■ Small 10-Pin Thermally Enhanced MSOP and

(3mm × 3mm) DFN Packages

APPLICATIONS

■ Automotive Battery Regulation

■ Power for Portable Products

■ Distributed Supply Regulation

■ Industrial Supplies

■ Wall Transformer Regulation

DESCRIPTION

The LT®3680 is an adjustable frequency (200kHz to

2.4MHz) monolithic buck switching regulator that accepts

input voltages up to 36V. A high efficiency 95m switch

is included on the die along with a boost Schottky diode

and the necessary oscillator, control, and logic circuitry.

Current mode topology is used for fast transient response

and good loop stability. Low ripple Burst Mode operation

maintains high efficiency at low output currents while

keeping output ripple below 15mV in a typical application.

In addition, the LT3680 can further enhance low output

current efficiency by drawing bias current from the output

when VOUT is above 3V. 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 flag signals when VOUT reaches

91% of the programmed output voltage. The LT3680 is

available in 10-Pin MSOP and 3mm × 3mm DFN packages

with exposed pads for low thermal resistance.

, 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.

TYPICAL APPLICATION

5V Step-Down Converter

VIN

6.3V TO 36V

OFF ON

VIN

RUN/SS

BD

BOOST

15k

10μF

680pF

63.4k

VC

LT3680

SW

RT

PG

SYNC

GND

FB

VOUT

5V

3.5A

0.47μF 4.7μH

536k

100k

47μF

3680 TA01a

Efficiency

100

VIN = 12V

90

VIN = 34V

80

VIN = 24V

70

60 VOUT = 5V

L = 4.7μH

f = 600kHz

50

0 0.5 1 1.5 2 2.5

OUTPUT CURRENT (A)

3 3.5

3680 G01

3680fa

1

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