RT9746WSC

® RT9746 VBUS OVP with a PTVS Diode General Description Features The RT9746 is an over-voltage protection devices feature a low 35mΩ (typ) RON internal FET with PTVS diode. The PTVS also protects the devices from surges up to  PTVS Diode Embedded for VBUS Surge Protection  100V. When the input voltage exceeds the over-voltage threshold, the internal FET is turned off to prevent damage to the protected down stream components.  Warning Indicator for OVP or UVP 28V Maximum Rating for DC Adapter Integrated Over-Voltage and Over-Current Protection FET on VBUS for Fault Isolation  Applications The internal Over-Voltage Thresholds (OVP) are preset to 6.8V typical. The RT9746 also feature an over-current protection and up to 4.5A.   The RT9746 is offered in a small WL-CSP-12B (BSC) package provides small PCB area applications. Cellular Phone Smart Handheld Device Pin Configuration (TOP VIEW) Ordering Information RT9746 Package Type WSC : WL-CSP-12B 1.92x1.27 OVP Threshold Option Default : 6.8V A : 11.5V B : 14.5V C : 6.2V A1 A2 A3 A4 GND VOUT VOUT GND_ PTVS B1 B2 B3 B4 WRNB VOUT VIN GND_ PTVS C1 C2 C3 C4 OVPFB VIN VIN GND_ PTVS WL-CSP-12B 1.92x1.27 (BSC) Marking Information Note : RT9746WSC Richtek products are :  RoHS compliant and compatible with the current require-  Suitable for use in SnPb or Pb-free soldering processes. 3CW 3C : Product Code W : Date Code ments of IPC/JEDEC J-STD-020. Simplified Application Circuit RT9746 VIN Adaptor CIN VOUT COUT R2 VDDIO OVPFB R1 Copyright © 2019 Richtek Technology Corporation. All rights reserved. September 2019 R3 WRNB GND_PTVS DS9746-01 Charger Processor GND is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT9746 Functional Pin Description Pin No Pin Name Pin Function A1 GND Common ground of internal circuits. A2, A3, B2 VOUT Output from VBUS load-switch. B1 WRNB Inverse warning signal (OCP,OTP, OVP, UVLO) flag output (open-drain). A4, B4, C4 GND_PTVS Common ground of power TVS diode. B3, C2, C3 VIN VBUS from power adapter. OVPFB External OVP adjustment setting. (if no used, be surely tied to GND) C1 Functional Block Diagram VIN VOUT PreRegulator OCP GND Power FET OTP UVLO OVPFB OVP SEL External & Internal OVP Digital Control GND_PTVS POR I/O Buffer WRNB Operation The RT9746 is a VBUS OVP protector switch. The OVP function is optimized to protect low voltage system from abnormal high input voltage (up to 28V) in handheld application. RT9746 is also embedded Power-TVS diode (PTVS) on VBUS pin for surge protection. If surge waveform is above 30V, it will be clamped to 30V due to PTVS diode. When plugging in VBUS, the OCP will be soft-start in 8ms in order to reduce in rush current and internal VOUT deglitch time is 16/32/64/128ms which is set by fuse. The OCP after soft-start is up to 4.5A for high current application. Copyright © 2019 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS9746-01 September 2019 RT9746 Absolute Maximum Ratings             (Note 1) VIN, OVPFB ---------------------------------------------------------------------------------------------------------------VOUT ------------------------------------------------------------------------------------------------------------------------