Datasheet > LT3959

LT3959

更新时间： 2023-12-20 18:44:11

品牌	Logo	应用领域
亚德诺 - ADI		开关转换器
页数	文件大小	规格书
26页	332K
描述
具 6A、40V 开关的宽输入电压范围升压 / SEPIC / 负输出转换器

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LT3959 数据手册

LT3959

Wide Input Voltage Range

Boost/SEPIC/Inverting Converter

with 6A, 40V Switch

FeaTures

DescripTion

The LT^®3959 is a wide input range, current mode, DC/DC

controller which is capable of regulating either positive or

negative output voltages from a single feedback pin. It can

be configured as a boost, SEPIC or inverting converter.

Wide V Range: 1.6V (2.5V Start-Up) to 40V

Positive or Negative Output Voltage Programming

with a Single Feedback Pin

PGOOD Output Voltage Status Report

Internal 6A/40V Power Switch

It features an internal low side N-channel MOSFET rated

for 6A at 40V and driven from an internal regulated sup-

Programmable Soft-Start

Programmable Operating Frequency (100kHz to 1MHz)

with One External Resistor

ply provided from V or DRIVE. The fixed frequency,

current-mode architecture results in stable operation over

a wide range of supply and output voltages. The operating

frequency of LT3959 can be set over a 100kHz to 1MHz

range with an external resistor, or can be synchronized

to an external clock using the SYNC pin.

Synchronizable to an External Clock

Low Shutdown Current < 1µA

INTV Regulator Supplied from V or DRIVE

Programmable Input Undervoltage Lockout with

Hysteresis

The LT3959 features soft-start and frequency foldback

functions to limit inductor current during start-up and

output short-circuit. A window comparator on the FBX

pin reports via the PGOOD pin, providing output voltage

status indication.

Thermally Enhanced QFN (5mm × 6mm) and TSSOP

Packages

applicaTions

Automotive

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

ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the

property of their respective owners. Protected by U.S. Patents, including 7825665.

Telecom

Industrial

Typical applicaTion

2.5V to 24V Input, 12V Output SEPIC Converter

Excellent for Automotive 12V Post Regulator

Efficiency vs Output Current

100

= 12V

4.7µF

50V

L1A

OUT

12V

500mA AT V = 2.5V

2.5V TO

24V

1.5A AT V > 8V

22µF

50V

×2

OUT

124k

121k

47µF

16V

×2

L1B

EN_UVLO

150k

LT3959

GND

PGOOD

DRIVE

TIE TO SGND

IF NOT USED

SYNC

105K

200

400

600

800

1000

FBX

OUTPUT CURRENT (mA)

SGND GNDK INTV

3959 TA01b

27.4k

300kHz

0.1µF 7.5k

22nF

15.8K

4.7µF

3959 TA01a

3959fa

For more information www.linear.com/LT3959

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