Electronic Components Datasheet Search |
|
LT1940LEFE Datasheet(PDF) 1 Page - Linear Dimensions Semiconductor |
|
LT1940LEFE Datasheet(HTML) 1 Page - Linear Dimensions Semiconductor |
1 / 20 page LT1940/LT1940L 1 1940fa TYPICAL APPLICATIO FEATURES APPLICATIO S DESCRIPTIO s Disk Drives s DSP Power Supplies s Wall Transformer Regulation s Distributed Power Regulation s DSL Modems s Cable Modems s Wide Input Voltage Range LT1940: 3.6V to 25V LT1940L: 3.6V to 7V s Two 1.4A Output Switching Regulators with Internal Power Switches s Constant 1.1MHz Switching Frequency s Anti-Phase Switching Reduces Ripple s Independent Shutdown/Soft-Start Pins s Independent Power Good Indicators Ease Supply Sequencing s Uses Small Inductors and Ceramic Capacitors s Small 16-Lead Thermally Enhanced TSSOP Surface Mount Package Dual Monolithic 1.4A, 1.1MHz Step-Down Switching Regulator The LT ®1940 is a dual current mode PWM step-down DC/DC converter with internal 2A power switches. Both con- verters are synchronized to a single 1.1MHz oscillator and run with opposite phases, reducing input ripple current. The output voltages are set with external resistor dividers, and each regulator has independent shutdown and soft-start circuits. Each regulator generates a power-good signal when its output is in regulation, easing power supply se- quencing and interfacing with microcontrollers and DSPs. The LT1940’s 1.1MHz switching frequency allows the use of tiny inductors and capacitors, resulting in a very small dual 1.4A output solution. Constant frequency and ceramic capacitors combine to produce low, predictable output ripple voltage. With its wide input range of 3.6V to 25V, the LT1940 regulates a wide variety of power sources, from 4-cell batteries and 5V logic rails to unregulated wall trans- formers, lead acid batteries and distributed-power supplies. The LT1940L is intended to operate from regulated 5V supplies. A current mode PWM architecture provides fast transient response with simple compensation components and cycle-by-cycle current limiting. Frequency foldback and thermal shutdown provide additional protection. , LTC and LT are registered trademarks of Linear Technology Corporation. Figure 1. 3.3V and 5V Dual Output Step-Down Converter with Output Sequencing (LT1940) Efficiency vs Load Current VIN 7V TO 25V BOOST1 SW1 FB1 VC1 RUN/SS1 RUN/SS2 BOOST2 SW2 FB2 VC2 PG1 PG2 LT1940 VIN GND 1940 F01 330pF 10 µF 10 µF 4.7 µF 0.1 µF 0.1 µF 15k 330pF 15k 10.0k 16.5k 100k 30.1k 10.0k 4.7 µH 3.3 µH POWER GOOD OUT2 5V 1.4A OUT1 3.3V 1.4A UPS140 UPS140 CMDSH-3 1nF CMDSH-3 LOAD CURRENT (A) 0 100 90 80 70 60 0.5 1.0 1940 F01b 1.5 VIN = 12V VOUT = 5V VOUT = 3.3V |
Similar Part No. - LT1940LEFE |
|
Similar Description - LT1940LEFE |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |