Datasheet > LT3697

LT3697

更新时间： 2024-09-15 14:57:35

品牌	Logo	应用领域
亚德诺 - ADI		稳压器
页数	文件大小	规格书
32页	440K
描述
具电缆压降补偿功能的 USB 5V、2.5A 输出、35V 输入降压型稳压器

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LT3697 数据手册

LT3697

USB 5V, 2.5A Output,

35V Input Buck with

Cable Drop Compensation

DescripTion

FeaTures

The LT^®3697 is a 35V, 2.5A step-down switching regulator

designed to power 5V USB applications. A precise output

voltage and programmable cable drop compensation

maintainaccurate5VregulationattheUSBsocketconnected

to the end of a long cable. The accurate, programmable

currentlimit caneliminatetheneedforaUSBpowerswitch

and improvesystem reliability. The provided180mA active

loadreducesoutputovershootduringloadtransients.Dual

feedback allows regulation on the output of a USB switch

and limits cable drop compensation to a maximum of 6.1V

output, protecting USB devices during fault conditions. A

separate 5V output can be taken from the SYS terminal

to power auxiliary circuitry such as a USB hub controller.

The LT3697 also provides a load current monitor output

and an overcurrent fault indicator.

Accurate 5V Output

Programmable Cable Drop Compensation

Programmable Output Current Limit

Adjustable Output from 5.0V to 6.1V

Dual Input Feedback Permits Regulation on Output

of USB Switch

Active Load Reduces Output Overshoot

FLT Flag Indicates Overcurrent on the USB Output

1.5ms FLT Flag Delay Filters Hot Plug Events

USB Output Current Monitor

Wide Input Rage: Operation from 5V to 35V

Withstands Input Transient to 60V

2.5A Maximum Output Current

Survives Output Short to GND and Car Battery

Adjustable Switching Frequency: 300kHz to 2.2MHz

Synchronizable from 300kHz to 2.2MHz

The LT3697 operates from 300kHz to 2.2MHz and with-

stands input voltage transients up to 60V. The device's

outputsurvivesshortstogroundandtothebattery.Acurrent

modetopologyisusedforfasttransientresponseandgood

loop stability. Shutdown reduces input supply current to

less than 1µA. The LT3697 is available in a 16-lead MSOP

package with an exposed pad for low thermal resistance.

Small, Thermally Enhanced 16-Lead MSOP Package

applicaTions

Automotive USB

Industrial USB

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.

Typical applicaTion

5V Step-Down Converter with Cable Drop Compensation and Output Current Limit

Transient Response

5.75

5.50

5.25

5.00

4.75

4.50

6.0

5.0

4.0

3.0

2.0

1.0

6V TO 35V

4 METERS AWG 20

TWISTED PAIR CABLE

TRANSIENT TO 60V

OUT

10µF

1µF

10µH

OUT

0.022Ω

0.13Ω

BST

47µF

10nF 10k

LT3697

–

LOAD

FLT

SYS

ISP

ISN

USB5V

RCBL

LOAD

5V, 2.5A

RLIM

SYNC

255k

7.5k

1nF

LOAD

25mA/µs

330pF

GND

16.5k

100µF

0.13Ω

3697 TA01

250µs/DIV

3697 TA01a

3697f

For more information www.linear.com/LT3697

12 3 4 5 6 7...32

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