NCP439 2A Very Low Ron Switches at Low Vin Voltage The NCP439 is a very low Ron MOSFET controlled by external logic pin, allowing optimization of battery life, and portable device autonomy. www.onsemi.com This load switch is a best in class in term of R optimization at DS(on) low V voltage. IN MARKING Due to a current consumption optimization with PMOS structure, DIAGRAM leakage currents are eliminated by isolating connected ICs on the battery when not used. 1 AY Output discharge path is also embedded to eliminate residual WLCSP4 AYW voltages on the output. CASE 567FG Proposed in wide input voltage range from 1.0 V to 3.6 V, and a very small 0.96 x 0.96 mm WLCSP4, 0.5 mm pitch. AY = Specific Device Code A = Assembly Location Features Y = Year W = Wafer Lot 1 V 3.6 V Operating Range 37 m P MOSFET at 1.8 V DC Current Up to 2 A PIN DIAGRAM Output AutoDischarge 12 Active High EN Pin WLCSP4 0.96 x 0.96 mm A OUT IN This is a PbFree Device Typical Applications Mobile Phones Tablets B GND EN Digital Cameras GPS (Top View) Portable Devices ORDERING INFORMATION See detailed ordering and shipping information on page 8 of this data sheet. DCDC Converter A2 A1 ICn IN OUT or LDO B2 B1 EN GND ENx EN 0 Figure 1. Typical Application Circuit Semiconductor Components Industries, LLC, 2013 1 Publication Order Number: August, 2016 Rev. 1 NCP439/DNCP439 PIN FUNCTION DESCRIPTION Pin Name Pin Number Type Description IN A2 POWER Loadswitch input voltage connect a 0.1 F or greater ceramic capacitor from IN to GND as close as possible to the IC. GND B1 POWER Ground connection. EN B2 INPUT Enable input, logic high turns on power switch. OUT A1 OUTPUT Loadswitch output connect a 0.1 F ceramic capacitor from OUT to GND as close as pos- sible to the IC is recommended. BLOCK DIAGRAM IN: Pin A2 OUT: Pin A1 Gate driver and soft start control Control logic EN: Pin B2 EN block GND: Pin B1 Figure 2. Block Diagram www.onsemi.com 2