lt3694-1 Linear Technology Corporation, lt3694-1 Datasheet

lt3694-1

Manufacturer Part Number

lt3694-1

Description

Lt3694/lt3694-1 - 36v, 2.6a Monolithic Buck Regulator With Dual Ldo

Manufacturer

Linear Technology Corporation

Datasheet

1.LT3694-1.pdf (28 pages)

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Download datasheet (277Kb)

APPLICATIONS

TYPICAL APPLICATION

FEATURES

4.5V TO 36V

Wide Input Range: 4V to 36V

Overvoltage Shutdown Protects Circuit Through

70V Transients

2.6A Output Switching Regulator with Internal

Power Switch

Dual, Low Dropout, Linear Regulator Controllers

with Programmable Current Limit

Tracking/Soft-Start Inputs and Power Good Output

Simplify Soft-Start and Supply Sequencing

Uses Small Inductors and Ceramic Capacitors

Adjustable 250kHz to 2.5MHz Switching Frequency

Accurate Enable Threshold Allows User

Programmable Undervoltage Lockout

Options for Clock Synchronization (LT3694) or Clock

Output to Enable Synchronization to Other Switching

Regulators (LT3694-1)

Thermally Enhanced 28-Lead 4mm × 5mm QFN and

20-Lead TSSOP Packages

Automotive

Industrial

DSL and Cable Modems

Distributed Power Regulation

Wall Transformer Regulation

450mA

OUT2

OUT(MIN)

OUT1

2.5V

0.1Ω

2.2μF

4.7μF

= 0.75V (Buck and LDOs)

10.7k

24.9k

1nF

51.1k

EN/UVLO

TRK/SS1

TRK/SS2

TRK/SS3

LIM2

DRV2

FB2

SYNC

PGOOD

= 800kHz

LT3694

GND

BIAS

DRV3

LIM3

BST

FB1

FB3

41.2k

B340A

0.22μF

15.4k

11k

36941 TA01a

330pF

0.1Ω

4.7μH

OUT1

2.2μF

34k

10k

OUT3

1.8V

450mA

47μF

OUT1

3.3V

1.7A

DESCRIPTION

The LT

DC/DC converters with dual, low dropout regulator con-

trollers. The switching converter is a step-down converter

capable of generating up to 2.6A at its output. Each regula-

tor has independent track/soft-start circuits simplifying

power supply sequencing and interfacing with micro-

controllers and DSPs.

The switching frequency is set with a single resistor with a

range of 250kHz to 2.5MHz. The high switching frequency

permits the use of small inductors and ceramic capacitors

leading to very small triple output solutions. The constant-

switching frequency, combined with low impedance ce-

ramic capacitors, results in low, predictable output ripple.

Protection circuitry senses the current in the power switch

and external Schottky catch diode to protect the LT3694

against short-circuit conditions. Frequency foldback and

thermal shutdown provide additional protection.

With its wide input voltage range of 4V to 36V, the LT3694

regulates a broad array of power sources from 4-cell batteries

and 5V logic rails to unregulated wall transformers, lead acid

batteries and distributed power supplies. The LT3694 can be

synchronized to an external clock with the SYNC pin while

the LT3694-1 offers a CLKOUT pin allowing other DC/DC

converters to synchronize to the LT3694-1 clock.

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

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

36V, 2.6A Monolithic Buck

Regulator With Dual LDO

3694/LT3694-1 are monolithic, current mode

100

Efficiency at V

= 4.5V

= 12V

LT3694/LT3694-1

= 36V

OUT

(A)

OUT

= 3.3V

= 800kHz

36941 TA01b

36941fa

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