Datasheet > LTC7878

LTC7878

更新时间： 2023-12-20 18:44:24

品牌	Logo	应用领域
亚德诺 - ADI		开关控制器电感器
页数	文件大小	规格书
29页	2176K
描述
具有电感器 DCR 电流检测功能的 70V 并行 4 开关升降压控制器

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中文翻译

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LTC7878 数据手册

LTC7878

70V Parallelable 4-Switch

Buck-Boost Controller with Inductor

DCR Current Sensing

FEATURES

DESCRIPTION

Single Inductor Architecture Allows V Above,

The LTC^®7878 is a high performance buck-boost switch-

ing regulator controller that operates from an input volt-

age above, below or equal to the output voltage. The con-

stant-frequency, peak current mode architecture allows

a phase-lockable switching frequency of up to 600kHz,

while a programmable input or output current loop regu-

lates the average input or output current accurately sup-

porting battery charging applications. With a wide 5V to

70V input and output range and seamless, low noise tran-

sitions between operating regions, the LTC7878 is ideal

for industrial and telecom systems.

Below or Equal to the Regulated V

OUT

Synchronous Rectification: Up to 98% Efficiency

Wide V Voltage Range: 5V to 70V

1% Output Voltage Accuracy: 1V ≤ V

≤ 70V

OUT

DCR or R

Current Sensing

SENSE

Peak Current Mode Control in Buck/Boost/Buck-

Boost Mode

Programmable Input or Output Current Regulation

7V NMOS Gate Drivers

Phase-Lockable Frequency (100kHz to 600kHz)

Multiphase/Multi-ICs Parallel Operation

Selectable Continuous or Pulse-Skipping Mode

Operation and Inductor Peak Current Limits

Small 32-Lead 5mm × 5mm QFN Package

The LTC7878 features forced continuous mode (FCM)/

pulse-skipping mode operation. It supports multiphase/

multi-ICs parallel operation for high power applications.

Additional features include 7V N-Channel gate drivers,

smart EXTV auxiliary supply and programmable induc-

APPLICATIONS

tor peak current limit. A PGOOD pin indicates when the

Industrial and Telecom Systems

Distributed DC Power or Battery Systems

output is within 10% of its designed set point.

The LTC7878 is available in a low profile 32-Lead QFN

package.

TYPICAL APPLICATION

4.7µH

OUT

12V, 6A

9V TO 36V

47nF

10k

22µF

0.1µF

BST2

BST1

0.1µF

OUT1

220µF

OUT2

220µF

Input Voltage Line Transient

9V_INto 15V_INto 9V_IN

SW1 ISNSD ISNSP

ISNSN SW2

BOOST1

BOOST2

BOOST1

BG1

BG2

10V/DIV

TG1

TG2

SW1

10V/DIV

OUT

EXTV

OUT(AC)

500mV/DIV

110k

LTC7878

CSP

0.022µF

10k

FREQ

100k

CSN

2A/DIV

MODE/ILIM

ITHB

7878 TA01b

BST1

INTV

1ms/DIV

CINTV

4.7µF

BOOST1

BST2

ITH

DRV

BOOST2

CDRV

4.7µF

SGND

PGND

15nF

7878 TA01a

Rev. A

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For more information www.analog.com

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中文翻译

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