Electronic Components Datasheet Search |
|
LTC1729CS8-4.1 Datasheet(PDF) 11 Page - Linear Technology |
|
LTC1729CS8-4.1 Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page 11 LTC1729 Series APPLICATIO S I FOR ATIO Figure 8. Terminate Charging at C/10 Figure 9. Modify C/10 Indication to Create Charging Indicator OVP BAT SENSE GND OVP BAT SENSE VCC VC STATUS NTC VC VCC 1 2 3 4 8 7 6 5 LTC1729-4.2 1 µF 0.1 µF 1729 F08 10k NTC THERMISTOR NTHS1206N02 VISHAY/DALE 200 Ω 100 µA 1729 F09 COMP1 LTC1729 SENSE IBIAS BAT + – SENSE RESISTOR CHARGE CURRENT the NTC pin will float to 5V as soon as the Status pull-down is open. This will force the state machine into the Hold mode. The VC pin is pulled low which turns off the charger. This circuit is shown in Figure 8. In order to restart the charging process for a new battery, the NTC pin will need to be momentarily brought below 0.2V or the VCC pin brought below the UVLO threshold. The automatic battery detection features are disabled during the Hold mode. Using Status as a Charging Indicator In many applications circuits shown in this data sheet, the STATUS pin is used to indicate when C/10 has occurred (charge current has dropped to 10% of the full charge current). This C/10 number is not fixed, but is set by an external resistor connected to the LTC1729 SENSE pin. A 100 µA bias current through this resistor develops a volt- age which is compared with the voltage across the charge current sense resistor. When these voltages are equal, the open-drain STATUS pin turns off. Connecting an LED to the STATUS pin will give a visual indication during the precondition trickle charge and the portion of the main charge before C/10 has occurred. By reducing the LTC1729 SENSE pin resistor to 0 Ω, the STATUS pin function can be changed to a charging indica- tor (Figure 9). The LED on the STATUS pin will always go off after the 3-hour charge cycle is completed, regardless of the C/10 circuitry. |
Similar Part No. - LTC1729CS8-4.1 |
|
Similar Description - LTC1729CS8-4.1 |
|
|
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 |