Datasheet > LT1946EMS8

LT1946EMS8

更新时间： 2024-10-02 22:30:55

品牌	Logo	应用领域
凌特 - Linear		转换器开关软启动
页数	文件大小	规格书
12页	268K
描述
1.2MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start

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LT1946EMS8 数据手册

LT1946

1.2MHz Boost

DC/DC Converter with

1.5A Switch and Soft-Start

FEATURES

DESCRIPTIO

TheLT^®1946isafixedfrequencystep-upDC/DCconverter

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

ating 8V at 430mA from a 3.3V input, the LT1946 is ideal

for large TFT-LCD panel power supplies. The LT1946

switches at 1.2MHz, 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.

■

1.5A, 36V Internal Switch

■

1.2MHz Switching Frequency

■

Integrated Soft-Start Function

Output Voltage Up to 34V

Low V_CESATSwitch: 300mV at 1.5A (Typ)

8V at 430mA from a 3.3V Input

Small 8-Lead MSOP Package

■

APPLICATIO S

■

TFT-LCD Bias Supplies

■

GPS Receivers

■

DSL Modems

Local Power Supplies

The 8-lead MSOP package and high switching frequency

ensurealowprofileoverallsolutionlessthan1.2mmhigh.

■

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

TYPICAL APPLICATIO

Efficiency

4.7µH

OUT

3.3V

430mA

28.7k

OFF ON

SHDN

LT1946

2.2µF

20µF

SS COMP GND

49.9k

5.23k

470pF

100nF

1946 F01

C1: 2.2µF, X5R OR X7R, 6.3V

C2: 2 × 10µF, X5R OR X7R, 10V

D1: MICROSEMI UPS120 OR EQUIVALENT

L1: TDK RLF5018T-4R7M1R4

100

200

LOAD CURRENT (mA)

400

500

300

1946 F01b

Figure 1. 3.3V to 8V, 430mA Step-Up DC/DC Converter

sn1946 1946fs

12 3 4 5 6 7...12

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