FTL11639: 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 DELAY_ADJ 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.

Features

• 8 kV HBM ESD (per JESD22-A114)
• 10 kV HBM ESD (Pin to Pin, V_BAT & V_OUT)
• 2 kV CDM (per JESD22-C101)