Electronic Components Datasheet Search |
|
LTC4085 Datasheet(PDF) 11 Page - Linear Technology |
|
LTC4085 Datasheet(HTML) 11 Page - Linear Technology |
11 / 24 page LTC4085 11 4085fd The LTC4085 is a complete PowerPath controller for bat- tery powered USB applications. The LTC4085 is designed to receive power from a USB source, a wall adapter, or a battery. It can then deliver power to an application con- nected to the OUT pin and a battery connected to the BAT pin (assuming that an external supply other than the battery is present). Power supplies that have limited cur- rent resources (such as USB VBUS supplies) should be connected to the IN pin which has a programmable current limit. Battery charge current will be adjusted to ensure that the sum of the charge current and load current does not exceed the programmed input current limit. An ideal diode function provides power from the battery when output/load current exceeds the input current limit or when input power is removed. Powering the load through the ideal diode instead of connecting the load directly to the battery allows a fully charged battery to remain fully charged until external power is removed. Once external power is removed the output drops until the ideal diode is forward biased. The forward biased ideal diode will then provide the output power to the load from the battery. Furthermore, powering switching regulator loads from the OUT pin (rather than directly from the battery) results in shorter battery charge times. This is due to the fact that switching regulators typically require constant input power. When this power is drawn from the OUT pin voltage (rather than the lower BAT pin voltage) the current consumed by the switching regulator is lower leaving more current available to charge the battery. The LTC4085 also has the ability to receive power from a wall adapter. Wall adapter power can be connected to the output (load side) of the LTC4085 through an exter- nal device such as a power Schottky or FET, as shown in Figure 1. The LTC4085 has the unique ability to use the output, which is powered by the wall adapter, as a path to charge the battery while providing power to the load. A wall adapter comparator on the LTC4085 can be configured to detect the presence of the wall adapter and shut off the connection to the USB to prevent reverse conduction out to the USB bus. OPERATION |
Similar Part No. - LTC4085 |
|
Similar Description - LTC4085 |
|
|
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 |