RT9728A 120m, 1.3A Power Switch with Programmable Current Limit General Description Features 10% Current Limit Accuracy 1.3A The RT9728A is a cost effective, low voltage, single Adjustable Current Limit : 75mA to 1.3A (typ.) P-MOSFET high side power switch IC for USB application Meets USB Current Limiting Requirements with a programmable current limit feature. Low switch-on Operating Voltage Range : 2.5V to 5.5V resistance (typ.120m) and low supply current (typ. Reverse InputOutput Voltage Protection 120A) are realized in this IC.The RT9728A can offer a Built-in Soft-Start programmable current limit threshold between 75mA and 120m High Side MOSFET 1.3A (typ.) via an external resistor. The 10% current limit 120A Supply Current accuracy can be realized for all current limit settings. In RoHS Compliant and Halogen Free addition, a flag output is available to indicate fault conditions to the local USB controller. Furthermore, the Applications chip also integrates an embedded delay function to prevent USB Bus/Self Powered Hubs mis-operation from happening due to high inrush current. USB Peripheral Ports The RT9728A is an ideal solution for USB power supply ACPI Power Distribution and can support flexible applications since it is functional Battery Power Equipment for various current limit requirements. It is available in 3G/3.5G Data Card, Set-Top Boxes SOT-23-6 and WDFN-6L 2x2 packages. Pin Configurations Ordering Information RT9728A (TOP VIEW) Package Type VOUT ILIM FAULT E : SOT-23-6 QW : WDFN-6L 2x2 6 5 4 Lead Plating System 23 G : Green (Halogen Free and Pb Free) Z : ECO (Ecological Element with EN/EN VIN GND Halogen Free and Pb free) SOT-23-6 H : Chip Enable High L : Chip Enable Low Note : 1 6 VOUT VIN Richtek products are : 2 5 ILIM GND FAULT 3 7 4 EN/EN RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. WDFN-6L 2x2 Suitable for use in SnPb or Pb-free soldering processes. Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS9728A-06 November 2013 www.richtek.com 1 GNDRT9728A Marking Information RT9728AHGE RT9728ALGE 01= : Product Code 02= : Product Code 01=DNN 02=DNN DNN : Date Code DNN : Date Code RT9728AHGQW RT9728ALGQW 17 : Product Code 19 : Product Code W : Date Code W : Date Code 17W 19W RT9728AHZQW RT9728ALZQW 17 : Product Code 19 : Product Code W : Date Code W : Date Code 17W 19W Typical Application Circuit VIN VOUT V V OUT IN C IN RT9728A 150F 10F R FAULT 100k R ILIM ILIM FAULT Signal FAULT Chip Enable EN/EN GND Functional Pin Description Pin No. Pin Name Pin Function SOT-23-6 WDFN-6L 2x2 1 6 VIN Input Voltage. 5, Ground. The exposed pad must be soldered to a large PCB and 2 GND 7 (Exposed Pad) connected to GND for maximum power dissipation. 3 4 Chip Enable. EN/EN Active-Low Open-Drain Output. Asserted during over current, 4 3 FAULT over temperature, or reverse-voltage conditions. Current Limit Set Pin. External resistor used to set current limit 5 2 ILIM threshold. Recommend 19.1k R 232k . ILIM 6 1 VOUT Power Switch Output. Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS9728A-06 November 2013 2