Configurable Load Switch and Reset Timer

The FTL11639 is both a timer for resetting a mobile device and an advanced load management device for applications requiring a highly integrated solution. If the mobile device is off, holding /SR0 LOW (by pressing power-on key) for 38 ms ±20% turns on the PMIC. As a reset timer, it has one input and one fixed delay output. It generates a fixed delay of 11.5 s ±20% by disconnecting the PMIC from the battery power supply. FTL11639 does not accept a new input signal for 400 ms ±20% to give the PMIC enough time to turn off. The reset delay can be customized by connecting an external resistor to the DELAYADJ pin. As an advanced load management switch, the FTL11639 disconnects loads powered from the DC power rail (<6 V) with stringent off-state current targets and high load capacitances (up to 200 µF). The FTL11639 consists of a slew-rate controlled low-impedance MOSFET switch (21 mΏ typical at 4.5 V) that has exceptionally low off-state current drain (<0.2 µA typical) to facilitate compliance with standby power requirements. The slew-rate-controlled turn-on characteristic prevents inrush current and the resulting excessive voltage drop on power rails. The low ICCT enables direct interface to lower-voltage chipsets without external translation, while maintaining low power consumption. The device is packaged in advanced, fully “green,” 1.31 mm x 1.62 mm, Wafer-Level Chip-Scale Packaging (WLCSP); providing excellent thermal conductivity, small footprint, and low electrical resistance for a wide application range.