 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LTC3444 Datasheet(PDF) 7 Page - Linear Technology |
|
||||||||||||||||||||||||||||||
LTC3444 Datasheet(HTML) 7 Page - Linear Technology |
|
|
7 / 20 page  7 LTC3444 3444fb OPERATIO The LTC3444 is a highly efficient, fixed frequency, buck- boost DC/DC converter, which operates from input volt- ages above, below, and equal to the output voltage. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for single Lithium-Ion or multi-cell applica- tions where the output voltage can vary over a wide range. The LTC3444 is designed to provide dynamic voltage control in space constrained 3G WCDMA applications. Due to the high operating frequency and integrated loop compensation a complete WCDMA application requires only six additional components; input and output capaci- tors (ceramic), an inductor, and three resistors. The high speed error amplifier and integrated loop compensation provide the fast transient response required to slew the RF power amplifier’s voltage rail from standby to transmit and transmit to standby levels in < 25 μs while minimizing output overshoot or undershoot. Efficiency under low output voltage conditions (standby mode) is improved by using an N-channel MOSFET in parallel to P-channel MOSFET switch D. This parallel MOSFET eliminates the need for an external Schottky. Output overvoltage protection protects the RF power amplifier from voltages greater than 5.5V. When used with the proper inductance and output capaci- tance, the LTC3444 internal compensation is designed to be consistent with the transient requirements of a typical WCDMA application. External compensation can be used with other combinations of inductance and output capaci- tance, however, the transient response may not be consistent with typical WCDMA requirements. Output voltage programming is accomplished via a sum- ming resistor input to the feedback resistive divider string. The output voltage varies inversely with the command voltage. When using the internal loop compensation, resistor R1 in the feedback resistive divider string must be 340k. There are no constraints on R1 when using external compensation. However, lower value resistors will de- crease the resistance value required for programming the output voltage. Care must be taken not to load down the control voltage source. |
Similar Part No. - LTC3444 |
|
Similar Description - LTC3444 |
|
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
