 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
RT9501A Datasheet(PDF) 7 Page - Richtek Technology Corporation |
|
||||||||||||||||||||||||||||||
RT9501A Datasheet(HTML) 7 Page - Richtek Technology Corporation |
|
|
7 / 9 page  RT9501A/B Preliminary 7 DS9501A/B-07 March 2007 www.richtek.com Constant Voltage Regulation and Charge Termination Mode When the battery voltage reaches the regulation voltage VO(REG), the constant voltage feedback control starts, and then the charge current begins to decrease as the typical charge profile shown. As the charge current decreases to lower than charge terminated current threshold, the RT9501 will terminate the charge cycle. Recharge Mode After the charge termination mode, if the battery voltage falls to lower than the recharge threshold voltage VO(RCH), the RT9501 will begin a new charge cycle according to the battery voltage. Battery Temperature Detection The RT9501 continuously detects the battery temperature by measuring the TS pin voltage. A NTC or PTC thermistor can parallel with RT2 to deviate the TS pin voltage. (As shown in Figure 5) The TS pin voltage must be within normal temperature voltage range that is shown in Figure 6 and electrical characteristics, and then RT9501 can start working normally. The RT1 and RT2 can be derived from following equations. For NTC Thermistors: For PTC Thermistors: Where RTL is the resistance value in lowest desired operation temperature and RTH is the resistance value in highest desired operation temperature. The resistances of thermistors are specified by the thermistor manufacturer. If the temperature monitoring function is not desired, there's an easy method to set RT1 and RT2 at the same value and disconnect the thermistor to disable this function. ×× ×× ×× TH TL T1 TH TL TH TL T2 TH TL 5R R R= 3(R - R ) 5R R R= [(2 R )-(7 R )] FB/CE Pin Functions This pin has two functions, one is to enable/disable the charge function, and the other is to finely adjust battery regulation voltage. Connect this pin to VDD to enable RT9501, and connect to ground to disable it (Figure 7). If this pin is connected to a voltage divider as shown in Figure 8, it can be a 2.1V reference voltage to adjust the output regulation voltage as desired. VDD GND V TS1 V TS2 Temperature Fault Range Normal Temperature Range Temperature Fault Range Figure 6 ×× × TH TL T1 TL TH 5R R R= 3(R - R ) ×× ×× TH TL T2 TL TH 5R R R= [(2 R )-(7 R )] Figure 5 FB/CE BATT TS STAT CC CS VDD GND Q1 R CS R T1 R T2 V IN + Thermistor Battery Pack C2 R4 Figure 7. For CE pin Function CE BATT TS STAT CC CS VDD GND Q1 V IN Battery R CS GPIO R CE R4 |
Similar Part No. - RT9501A_07 |
|
Similar Description - RT9501A_07 |
|
|
|
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
