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NCP436 Datasheet(PDF) 5 Page - ON Semiconductor |
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NCP436 Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 7 page NCP436, NCP437 http://onsemi.com 5 TIMINGS Figure 3. Enable, Rise and Fall Time TR TEN TON TOFF TDIS TF VIN EN VOUT FUNCTIONAL DESCRIPTION Overview The NCP437 is a high side P channel MOSFET power distribution switch designed to isolate ICs connected on the battery in order to save energy. The part can be turned on, with a wide range of battery from 1.0 V to 3.6 V. Enable Input Enable pin is an active high. The path is opened when EN pin is tied low (disable), forcing P MOS switch off. The IN/OUT path is activated with a minimum of VIN of 1.2 V and EN forced to high level. Auto Discharge NMOS FET is placed between the output pin and GND, in order to discharge the application capacitor connected on OUT pin. The auto−discharge is activated when EN pin is set to low level (disable state). The discharge path (Pull down NMOS) stays activated as long as EN pin is set at low level and VIN > 1.2 V. In order to limit the current across the internal discharge N−MOSFET, the typical value is set at 65 W. CIN and COUT Capacitors IN and OUT, 1 mF, at least, capacitors must be placed as close as possible the part to for stability improvement. |
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