Datasheet > LT1931

LT1931

更新时间： 2024-11-30 14:57:31

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
12页	448K
描述
ThinSOT 封装的 1.2MHz 负输出 DC/DC 转换器

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中文翻译

获取价格

数据手册

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LT1931 数据手册

LT1931/LT1931A

1.2MHz/2.2MHz Inverting

DC/DC Converters in ThinSOT

FEATURES

DESCRIPTIO

The LT^®1931/LT1931A are the industry’s highest power

inverting SOT-23 current mode DC/DC converters. Both

parts include a 1A integrated switch allowing high current

outputs to be generated in a small footprint. The LT1931

switchesat1.2MHzwhiletheLT1931Aswitchesat2.2MHz.

These high speeds enable the use of tiny, low cost

capacitors and inductors 2mm or less in height. The

LT1931 is capable of generating –5V at 350mA or –12V

at 150mA from a 5V supply, while the LT1931A can

generate –5V at 300mA using significantly smaller induc-

tors. Both parts are easy pin-for-pin upgrades for higher

power LT1611 applications.

■

Fixed Frequency 1.2MHz/2.2MHz Operation

■

Very Low Noise: 1mV_P-POutput Ripple

■

–5V at 350mA from 5V Input

–12V at 150mA from 5V Input

■

Uses Small Surface Mount Components

■

Wide Input Range: 2.6V to 16V

■

Low Shutdown Current: <1µA

■

Low V_CESATSwitch: 400mV at 1A

■

Pin-for-Pin Compatible with the LT1611

Low Profile (1mm) ThinSOT^TMPackage

■

APPLICATIO S

The LT1931/LT1931A operate in a dual inductor inverting

topology that filters both the input side and output side

current.Verylowoutputvoltagerippleapproaching1mV_P-P

canbeachievedwhenceramicoutputcapacitorsareused.

Fixed frequency switching ensures a clean output free

from low frequency noise typically present with charge

pumpsolutions.Thelowimpedanceoutputremainswithin

1% of nominal during large load steps. The 36V switch

allows V_INto V_OUTdifferential of up to 34V.

■

Disk Drive MR Head Bias

■

Digital Camera CCD Bias

■

LCD Bias

GaAs FET Bias

Local Low Noise/Low Impedance Negative Supply

■

The LT1931/LT1931A are available in the 5-lead ThinSOT

package.

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

trademark of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

TYPICAL APPLICATIO

1µF

Efficiency

L1A

L1B

10µH

100

OUT

–5V

SHDN

350mA

220pF

LT1931

GND

29.4k

4.7µF

22µF

NFB

10k

C1: TAIYO YUDEN X5R JMK212BJ475MG

C2: TAIYO YUDEN X5R LMK212BJ105MG

C3: TAIYO YUDEN X5R JMK325BJ226MM

D1: ON SEMICONDUCTOR MBR0520

L1: SUMIDA CLS62-100

1931 F01

100 150 200 250 300 350

LOAD CURRENT (mA)

1931 TA01

Figure 1. 5V to –5V, 350mA Inverting DC/DC Converter

1931fa

12 3 4 5 6 7...12

中文翻译

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与LT1931相关器件

型号	品牌	获取价格	描述	数据表
LT1931_15	Linear	获取价格	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
LT1931A	Linear	获取价格	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
LT1931A_15	Linear	获取价格	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
LT1931AES5	Linear	获取价格	LT1931 - 1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT; Package: SOT; Pins: 5; Tempe
LT1931AES5#TR	Linear	获取价格	LT1931 - 1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT; Package: SOT; Pins: 5; Tempe
LT1931AES5#TRMPBF	Linear	获取价格	LT1931 - 1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT; Package: SOT; Pins: 5; Tempe
LT1931AIS5	Linear	获取价格	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
LT1931AIS5#PBF	Linear	获取价格	暂无描述
LT1931AIS5#TR	Linear	获取价格	LT1931 - 1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT; Package: SOT; Pins: 5; Tempe
LT1931AIS5#TRMPBF	Linear	获取价格	LT1931 - 1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT; Package: SOT; Pins: 5; Tempe

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