RT9731AZQW(2) Richtek

RT9731A/B Dual Channel Precision Adjustable Current Limited Power Switch General Description Features 2.5V to 5.5V Input Voltage Range The RT9731A/B is a dual channel power distribution switch Two Separate Current Limiting Channels intended for applications where precision current limiting Meets USB Current Limiting Requirements is required or heavy capacitive loads and short circuits Adjustable Current Limit from 560mA to 2.8A are encountered. This device offers a programmable current 7.5% Current Limit Accuracy at 2.8A limit threshold between 560mA and 2.8A (typ.) per channel Two 44m High Side MOSFETs via an external resistor. The power-switch s rising and falling 2A Maximum Standby Supply Current times are controlled to minimize current surges during Built-in Soft-Start on/off transitions. Thin 10-Lead WDFN Package Each channel of the RT9731A/B limits the output current UL ApprovedE219878 to a safe level by switching into constant-current mode Nemko Approved-NO65969 whenever the output load exceeds the current limit RoHS Compliant and Halogen Free threshold. The FLAG logic output of each channel independently asserts low during over current. Applications The RT9731A/B is available in a thin WDFN-10L 3x3 USB Ports/Hubs package. Digital TV Set-Top Boxes Ordering Information VOIP Phones RT9731A/B (2) Pin 1 Orientation*** Pin Configurations (2) : Quadrant 2, Follow EIA-481-D Package Type (TOP VIEW) QW : WDFN-10L 3x3 (W-Type) GND 1 10 FLAG1 Lead Plating System 2 9 VIN VOUT1 VIN 3 8 VOUT2 Z : ECO (Ecological Element with 4 7 EN1 ISET Halogen Free and Pb free) 5 11 6 FLAG2 EN2 EN Function WDFN-10L 3x3 A : Active Low RT9731A B : Active High Note : 10 GND 1 FLAG1 ***Empty means Pin1 orientation is Quadrant 1 2 9 VIN VOUT1 3 8 VIN VOUT2 Richtek products are : 4 7 ISET EN1 5 11 6 EN2 FLAG2 RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. WDFN-10L 3x3 Suitable for use in SnPb or Pb-free soldering processes. RT9731B Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS9731A/B-02 May 2015 www.richtek.com 1 GND GNDRT9731A/B Marking Information RT9731AZQW RT9731BZQW 14 : Product Code 20 : Product Code YMDNN : Date Code YMDNN : Date Code 14 YM 20 YM DNN DNN Typical Application Circuit RT9731A/B Supply Voltage 2, 3 9 VOUT1 VOUT1 VIN 2.5V to 5.5V 10F 0.1F 8 R1 R2 VOUT2 VOUT2 C C OUT2 OUT1 6 FLAG2 150F 150F 10 FLAG1 7 ISET 4 RT9731B EN1/EN1 R Chip Enable ISET 5 1, 11 (Exposed Pad) RT9731A EN2/EN2 GND Chip Enable Note : R1, R2 Pull-Up Resistance (10k to 100k) Functional Pin Description Pin No. Pin Name Pin Function Ground. The exposed pad must be soldered to a large PCB and 1, 11 (Exposed Pad) GND connected to GND for maximum power dissipation. 2, 3 VIN Input Voltage. EN1 Chip Enable (Active Low). Turns on power switch for channel 1. (RT9731A) 4 EN1 Chip Enable (Active High). Turns on power switch for channel 1. (RT9731B) EN2 Chip Enable (Active Low). Turns on power switch for channel 2. (RT9731A) 5 EN2 Chip Enable (Active High). Turns on power switch for channel 2. (RT9731B) Channel 2 Fault Indicator (Active Low). This open-drain output asserts 6 FLAG2 low during over current and over temperature conditions. Current Limit Set Pin. Connect to an external resistor to set the current 7 ISET limit threshold. 8 VOUT2 Channel 2 Power Switch Output. 9 VOUT1 Channel 1 Power Switch Output. Channel 1 Fault Indicator (Active Low). This open-drain output asserts FLAG1 10 low during over current and over temperature conditions. Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS9731A/B-02 May 2015 2