Datasheet > LTC3822

LTC3822

更新时间： 2023-12-20 18:46:25

品牌	Logo	应用领域
亚德诺 - ADI		控制器
页数	文件大小	规格书
20页	204K
描述
No RSENSE?、低输入电压、同步降压型 DC/DC 控制器

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LTC3822 数据手册

LTC3822

No R_SENSE™, Low Input

Voltage, Synchronous Step-Down

DC/DC Controller

FEATURES

DESCRIPTION

The LTC^®3822 is a synchronous step-down switching

regulator controller that drives external N-channel power

MOSFETs using few external components. The constant

No Current Sense Resistor Required

All N-Channel MOSFET Synchronous Drive

High Current Outputs Possible

Constant Frequency Current Mode Operation for

frequency current mode architecture with MOSFET V

Excellent Line and Load Transient Response

sensing eliminates the need for sense resistors and im-

V : 2.75V to 4.5V

proves efﬁciency.

1% 0.6V Reference

A maximum duty cycle of 99% provides low dropout

operation. The switching frequency can be programmed

up to 750kHz, allowing the use of small surface mount

inductors and capacitors.

Low Dropout Operation: 99% Duty Cycle

Selectable Frequency (300kHz/550kHz/750kHz)

Internal Soft-Start Circuitry

Selectable Maximum Peak Current Sense Threshold

The LTC3822 is available in thermally enhanced DFN and

10-lead MSOP packages.

Digital RUN Control Pin

Output Overvoltage Protection

Micropower Shutdown: I = 7.5μA

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

No R

is a trademark of Linear Technology Corporation. All other trademarks are the

SENSE

Tiny Thermally Enhanced Leadless (3mm × 3mm)

property of their respective owners. Protected by U.S. Patents, including 5481178, 5929620,

6580258, 6304066, 5847554, 6611131, 6498466.

DFN or 10-Lead MSOP Package

APPLICATIONS

3.3V Systems

Li-Ion Battery Systems

TYPICAL APPLICATION

1.8V/8A High Efﬁciency, 550kHz Step-Down Converter

Efﬁciency and Power Loss vs

Load Current

100

= 3.3V

IPRG

2.75V TO 4.5V

EFFICIENCY

47μF

RUN

FDS6898A

0.47μH

FREQ

1.8V

OUT

LTC3822

0.22μF

BOOST

100μF

5.1k

680pF

POWER LOSS

0.1

0.01

GND

59k

118k

100

1000

LOAD CURRENT (mA)

10000

3822 TA01

3822 TA01b

3822fa

12 3 4 5 6 7...20

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