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LT3684EDD

36V, 2A, 2.8MHz Step-Down Switching Regulator

Linear Technology 

LT3684

36V, 2A, 2.8MHz Step-Down

Switching Regulator

FEATURES

■ Wide Input Range: 3.6V to 34V Operating,

36V Maximum

■ 2A Maximum Output Current

■ Adjustable Switching Frequency: 300kHz to 2.8MHz

■ Low Shutdown Current: IQ < 1µA

■ Integrated Boost Diode

■ Power Good Flag

■ Saturating Switch Design: 0.18Ω On-Resistance

■ 1.265V Feedback Reference Voltage

■ Output Voltage: 1.265V to 20V

■ 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®3684 is an adjustable frequency (300kHz to 2.8MHz)

monolithic buck switching regulator that accepts input

voltages up to 34V (36V maximum). A high efficiency

0.18Ω 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. The LT3684’s

high operating frequency allows the use of small, low cost

inductors and ceramic capacitors resulting in low output

ripple while keeping total solution size to a minimum.

The low current shutdown mode 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

90% of the programmed output voltage. The LT3684 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.

All other trademarks are the property of their respective owners.

TYPICAL APPLICATION

3.3V Step-Down Converter

VIN

4.5V TO

34V

VIN

BD

VOUT

3.3V

2A

4.7µF

OFF ON

16.2k

330pF

RUN/SS

BOOST

VC

SW

LT3684

RT

0.47µF 4.7µH

PG

60.4k

BIAS

GND

FB

324k

200k

22µF

3684 TA01

Efficiency

90

80

70

60

50

40

30

0

VIN = 12V

VOUT = 3.3V

L = 4.7µH

f = 800kHz

0.5

1

1.5

2

LOAD CURRENT (A)

3684 TA01b

3684f

1

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