Datasheet > LT1776

LT1776

更新时间： 2023-12-20 18:45:51

品牌	Logo	应用领域
亚德诺 - ADI		开关稳压器
页数	文件大小	规格书
20页	229K
描述
宽输入范围、高效率、降压型开关稳压器

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LT1776 数据手册

LT1776

Wide Input Range,

High Efficiency, Step-Down

Switching Regulator

DESCRIPTION

FEATURES

The LT^®1776 is a wide input range, high efficiency Buck

(step-down) switching regulator. The monolithic die in-

cludes all oscillator, control and protection circuitry. The

part can accept input voltages as high as 60V and contains

an output switch rated at 700mA peak current. Current

mode control delivers excellent dynamic input supply

rejection and short-circuit protection.

■

Wide Input Range: 7.4V to 40V

■

Tolerates Input Transients to 60V

■

700mA Peak Switch Rating

■

Adaptive Switch Drive Maintains Efficiency at High

Load Without Pulse Skipping at Light Load

■

True Current Mode Control

■

200kHz Fixed Operating Frequency

■

Synchronizable to 400kHz

The LT1776 contains several features to enhance effi-

ciency. The internal control circuitry is normally powered

via the V_CCpin, thereby minimizing power drawn directly

from the V_INsupply (see Applications Information). The

action of the LT1776 switch circuitry is also load depen-

dent. At medium to high loads, the output switch circuitry

maintains fast rise time for good efficiency. At light loads,

rise time is deliberately reduced to avoid pulse skipping

behavior.

■

Low Supply Current in Shutdown: 30µA

■

Available in 8-Pin SO and PDIP Packages

APPLICATIONS

■

Automotive DC/DC Converters

■

Cellular Phone Battery Charger Accessories

■

IEEE 1394 Step-Down Converters

The available SO-8 package and 200kHz switching fre-

quency allow for minimal PC board area requirements.

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

TYPICAL APPLICATION

Efficiency vs V_INand I_LOAD

8V TO 40V

SHDN

100µH*

400mA

100µF

10V

36.5k

39µF

63V

MBR160

LT1776

SYNC

2200pF

= 10V

= 20V

= 30V

= 40V

12.1k

100pF

22k

GND

*43T #30 ON MAGNETICS

MPP #55030

1776 F01

100

1000

LOAD CURRENT (mA)

1776 TA01

Figure 1

12 3 4 5 6 7...20

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