Datasheet > LT1946A

LT1946A

更新时间： 2024-10-04 14:57:35

品牌	Logo	应用领域
亚德诺 - ADI		开关软启动转换器
页数	文件大小	规格书
12页	318K
描述
具 1.5A 开关和软启动功能的 2.7MHz 升压型 DC/DC 转换器

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中文翻译

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数据手册

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LT1946A 数据手册

LT1946A

2.7MHz Boost DC/DC

Converter with 1.5A Switch

and Soft-Start

FEATURES

DESCRIPTIO

■

1.5A, 36V Internal Switch

The LT^®1946A is a fixed frequency step-up DC/DC con-

verter containing an internal 1.5A, 36V switch. Capable of

generating 12V at 430mA from a 5V input, the LT1946A is

ideal for powering large TFT-LCD panels. The LT1946A

switches at 2.7MHz, allowing the use of tiny, low profile

inductors and low value ceramic capacitors. Loop com-

pensationcanbeeitherinternalorexternal, givingtheuser

flexibility in setting loop compensation and allowing opti-

mized transient response with low ESR ceramic output

capacitors.Soft-startiscontrolledwithanexternalcapaci-

tor which determines the input current ramp rate during

start up. The 8-lead MSOP package and high switching

frequency ensure a low profile overall solution less than

1.1mm high.

■

2.7MHz Switching Frequency

■

Integrated Soft-Start Function

Adjustable Output from V_INto 35V

■

Low V_CESATSwitch: 300mV at 1.5A (Typical)

■

12V at 430mA from a 5V Input

■

Small Thermally Enhanced 8-Lead MSOP Package

APPLICATIO S

■

TFT-LCD Bias Supplies

■

GPS Receivers

■

DSL Modems

Local Power Supply

■

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

TYPICAL APPLICATIO

Efficiency

2.2µH

OUT

12V

430mA

182k

OFF ON

SHDN

LT1946A

2.2µF

COMP

GND*

27.4k

21k

100nF

270pF

1946A TA01

C1: 2.2µF, X5R or X7R, 6.3V

C2: 2.2µF, X5R or X7R, 16V

D1: MICROSEMI UPS120 OR EQUIVALENT

L1: SUMIDA CR43-2R2

* EXPOSED PAD MUST ALSO BE GROUNDED

100

200

300

400

500

LOAD CURRENT (mA)

Figure 1. 5V to 12V, 430mA Step-Up DC/DC Converter

1946A TA01

sn1946a 1946afs

12 3 4 5 6 7...12

中文翻译

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