Electronic Components Datasheet Search |
|
LTC3672BEDC-2-TRPBF Datasheet(PDF) 8 Page - Linear Technology |
|
LTC3672BEDC-2-TRPBF Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page LTC3672B-2 8 3672b2fa OPERATION Switch Slew-Rate Control The buck regulator contains new patent pending circuitry to limit the slew rate of the switch node (SW pin). This new circuitry is designed to transition the switch node over a period of a couple nanoseconds, significantly reducing radiated EMI and conducted supply noise while maintaining high efficiency. LOW VIN SUPPLY UNDERVOLTAGE LOCKOUT An undervoltage lockout (UVLO) circuit shuts down the LTC3672B-2 when VIN drops below about 1.7V. LOW DROPOUT LINEAR REGULATORS (LDOs) The LTC3672B-2 contains two 150mA fixed-output LDO regulators. LDO1 takes power from the VIN1 pin and regulates a 2.8V output at the LDO1 pin. LDO2 takes power straight from VIN and regulates a 1.8V output at the LDO2 pin. For stability, each LDO output must be bypassed to ground with a minimum 1μF ceramic capacitor. APPLICATIONS INFORMATION BUCK REGULATOR INDUCTOR SELECTION Many different sizes and shapes of inductors are avail- able from numerous manufacturers. Choosing the right inductor from such a large selection of devices can be overwhelming, but following a few basic guidelines will make the selection process much simpler. The buck regulator is designed to work with inductors in the range of 2.2μH to 10μH. A 4.7μH inductor is a good starting point. Larger value inductors reduce ripple cur- rent, which improves output ripple voltage. Lower value inductors result in higher ripple current and improved transient response time. To maximize efficiency, choose an inductor with a low DC resistance. Choose an inductor with a DC current rating at least 1.5 times larger than the maximum load current to ensure that the inductor does not saturate during normal operation. If output short-circuit is a possible condition, the inductor should be rated to handle the maximum peak current specified for the step- down converters. Different core materials and shapes will change the size/cur- rent and price/current relationship of an inductor. Toroid or shielded pot cores in ferrite or Permalloy™ materials are small and don’t radiate much energy, but generally cost more than powdered iron core inductors with similar electrical characteristics. Inductors that are very thin or have a very small volume typically have much higher core and DCR losses, and will not give the best efficiency. The choice of which style inductor to use often depends more on the price vs size, performance, and any radiated EMI requirements than on what the buck regulator needs to operate. Table 1 shows several inductors that work well with the buck regulator. These inductors offer a good compromise in current rating, DCR and physical size. Consult each manufacturer for detailed information on their entire selection of inductors. |
Similar Part No. - LTC3672BEDC-2-TRPBF |
|
Similar Description - LTC3672BEDC-2-TRPBF |
|
|
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 |