LT1946EMS8 Datasheet

IC型號(hào)：
LT1946EMS8
PDF描述：
1.2MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start
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LT1946

1.2MHz Boost

DC/DC Converter with

1.5A Switch and Soft-Start

FEATURES

DESCRIPTIO

1.5A, 36V Internal Switch

1.2MHz Switching Frequency

Integrated Soft-Start Function

Output Voltage Up to 34V

Low V

CESAT

Switch: 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 LT

廬

1946 is a fixed frequency step-up DC/DC converter

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-

pensation can be either internal or external, giving the user

flexibility in setting loop compensation and allowing opti-

mized transient response with low ESR ceramic output

capacitors. Soft-start is controlled with an external capaci-

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 1.2mm high.

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

TYPICAL APPLICATIO

3.3V

4.7碌H

SHDN

LT1946

100nF

COMP GND

OFF ON

2.2碌F

49.9k

470pF

OUT

430mA

EFFICIENCY (%)

28.7k

5.23k

20碌F

C1: 2.2碌F, X5R OR X7R, 6.3V

C2: 2

脳

10碌F, X5R OR X7R, 10V

D1: MICROSEMI UPS120 OR EQUIVALENT

L1: TDK RLF5018T-4R7M1R4

1946 F01

100

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

Efficiency

400

300

LOAD CURRENT (mA)

200

500

1946 F01b

sn1946 1946fs

數(shù)據(jù)列表
LT1946
標(biāo)準(zhǔn)包裝
50
類別
集成電路 (IC)
家庭
PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器
系列
-
類型
升壓（升壓）
輸出類型
-
輸出數(shù)
1
輸出電壓
-
輸入電壓
2.45 V ~ 16 V
PWM 型
電流模式
頻率 - 開(kāi)關(guān)
2.7MHz
電流 - 輸出
1.5A
同步整流器
無(wú)
工作溫度
-40°C ~ 85°C
安裝類型
表面貼裝
封裝/外殼
8-TSSOP，8-MSOP（0.118"，3.00mm 寬）
包裝
管件
供應(yīng)商設(shè)備封裝
8-MSOP

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LT1946EMS8 Datasheet

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