RT9728ALGE

RT9728A 120m, 1.3A Power Switch with Programmable Current Limit General Description Features zz z zz 10% Current Limit Accuracy @ 1.3A The RT9728A is a cost effective, low voltage, single zz z zz Adjustable Current Limit : 75mA to 1.3A (typ.) P-MOSFET high side power switch IC for USB application zz z zz Meets USB Current Limiting Requirements with a programmable current limit feature. Low switch-on zz z zz Operating Voltage Range : 2.5V to 5.5V resistance (typ.120m) and low supply current (typ. zz z zz Reverse InputOutput Voltage Protection 120A) are realized in this IC.The RT9728A can offer a zz z zz Built-in Soft-Start programmable current limit threshold between 75mA and zz z zz 120m High Side MOSFET 1.3A (typ.) via an external resistor. The 10% current limit zz z zz 120A Supply Current accuracy can be realized for all current limit settings. In zz z zz 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 z USB Bus/Self Powered Hubs mis-operation from happening due to high inrush current. z USB Peripheral Ports The RT9728A is an ideal solution for USB power supply z ACPI Power Distribution and can support flexible applications since it is functional z Battery Power Equipment for various current limit requirements. It is available in z 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-04 January 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-04 January 2013 2