 |
データシートサーチシステム |
|
|
データシートサーチシステム |
|
LT1959 データシート(PDF) 1 Page - Linear Technology |
|
|
|||||||||||||||||||||||||||||
LT1959 データシート(HTML) 1 Page - Linear Technology |
|
|
1 / 24 page  1 LT1959 DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATION 4.5A, 500kHz Step-Down Switching Regulator s Operates with Input as Low as 4V s Output Range Down to 1.21V s Constant 500kHz Switching Frequency s Uses All Surface Mount Components s Inductor Size Reduced to 1.8 µH s Saturating Switch Design: 0.07 Ω s Shutdown Current: 20 µA s Easily Synchronizable s Cycle-by-Cycle Current Limiting s 4.5A Switch s Current Mode Control The LT ®1959 is a 500kHz monolithic buck mode switching regulator functionally identical to the LT1506 but optimized for lower output voltage applications. It will operate down to 1.21V output compared to 2.42V for the LT1506. A 4.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. High switching fre- quency allows a considerable reduction in the size of ex- ternal components. The topology is current mode for fast transient response and good loop stability. A special high speed bipolar process and new design tech- niques achieve high efficiency at high switching frequency. Efficiency is maintained over a wide output current range by keeping quiescent supply current to 4mA and by utiliz- ing a supply boost capacitor to saturate the power switch. The LT1959 fits into standard 7-pin DD and fused lead SO-8 packages. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts are used, including the inductor and capacitors. There is the optional function of shutdown or synchronization. A shutdown signal reduces supply current to 20 µA.Synchronizationallowsanexternallogiclevelsig- nal to increase the internal oscillator from 580kHz to 1MHz. s Portable Computers s Battery-Powered Systems s Battery Chargers s Distributed Power s 5V to 3.3V Conversion s 5V to 2.5V Conversion s 5V to 1.8V Conversion , LTC and LT are registered trademarks of Linear Technology Corporation. Efficiency vs Load Current 5V to 1.8V Down Converter BOOST LT1959 VIN OUTPUT 1.8V 4A INPUT 5V 1959 TA01 C2 0.68 µF CC 1.5nF D1 MBRS330T3 C1 100 µF, 10V SOLID TANTALUM C3 10 µF TO 50 µF CERAMIC D2 1N914 L1 5 µH VSW FB SHDN OPEN OR HIGH = ON GND VC + + R2 2.49k R1 1.21k LOAD CURRENT (A) 0 90 85 80 75 70 2.0 2.5 3.0 3.5 1959 TA02 0.5 1.0 1.5 4.0 VOUT = 3.3V VIN = 5V L = 10 µH |
同様の部品番号 - LT1959 |
|
同様の説明 - LT1959 |
|
|
|
リンク URL |
| ALLDATASHEETはお客様のビジネスに役立ちますか？ [ DONATE ] |
Alldatasheetは | 広告 | お問い合わせ | プライバシーポリシー | データシートへのリンク | リンク交換 | メーカーリスト All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Japanese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
