Electronic Components Datasheet Search |
|
SC4601 Datasheet(PDF) 7 Page - Semtech Corporation |
|
SC4601 Datasheet(HTML) 7 Page - Semtech Corporation |
7 / 18 page 7 2006 Semtech Corp. www.semtech.com SC4601 POWER MANAGEMENT Block Diagram Applications Information Enable Pulling and holding the SYNC/SLEEP pin below 0.8V ini- tializes the SLEEP mode of the SC4601with its typical SLEEP mode supply current of 10uA. During the SLEEP mode, the high side and low side MOSFETs are turned off and the internal soft start voltage is held low. Oscillator The oscillator uses an external resistor to set the oscilla- tion frequency when the SYNC/SLEEP pin is pulled and held above 2V. The ramp waveform is a triangle at the PWM frequency with a peak voltage of 1.85V and a val- ley voltage of 0.35V. A 100% maximum duty cycle allows the SC4601 to operate as a low dropout regulator in the event of a low battery condition. The resistor tolerance adds to the accuracy of the oscillator frequency. The ex- ternal resistor connected to the FS pin, as shown below determines the approximate operating frequency: T 7 S R 10 66 . 1 f • = An external clock connected to the SYNC/SLEEP acti- vates its synchronous mode and the frequency of the clock can be up to 700kHz with V IN ≤ 3.6V. UVLO When the SYNC/SLEEP pin is pulled and held above 2V, the voltage on the Vcc pin determines the operation of the SC4601. As Vcc increases during start up, the UVLO block senses Vcc and keeps the high side and low side MOSFETs off and the internal soft start voltage low until Vcc reaches 2.75V. If no faults are present, the SC4601 will initiate a soft start when Vcc exceeds 2.75V. A hys- teresis (65mV) in the UVLO comparator provides noise immunity during its start up. |
Similar Part No. - SC4601 |
|
Similar Description - SC4601 |
|
|
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 |