loading

Over Voltage Protection IC

RT9718

Update Alert Share

The RT9718 is an integrated circuit optimized to protect low voltage system from abnormal high input voltage (up to 30V). The IC monitors the input voltage, battery voltage and the charging current to make sure all three parameters are operated in normal range. When the input voltage exceeds a certain OVP threshold voltage level, the IC will turn off the power MOSFET within 1ms to remove the power before any damage occurs. The RT9718 also can provide a voltage output without the existence of battery.

The current in the power MOSFET is also limited to prevent charging the battery with an excessive current. The current limit can be programmed by an external resistor between ILIM and GND. The OCP function also has a 4-bit binary counter that accumulates during an OCP event. When the total count reaches consecutive 16 times, the power MOSFET is turned off permanently unless the input power is recycled.

The IC also monitors the battery voltage, Once the battery voltage exceeds 4.35V and last for more then 180us blinking time, the RT9718 will turn off the MOSFET. The internal logic control will turn off the power MOSFET permanently when the battery over-voltage event occurs for consecutive 16 times.

Applications

Key Spec.
RT9718A RT9718B RT9718C RT9718D
Status Active Active Active Active
Vin (min) (V) 4 4 4 4
Vin (max) (V) 6.5 5.5 5.9 6.9
Vin_ovp (typ) (V) 6.8 5.85 6.25 7.2
Delay Time (max) (us) 1 1 1 1
Iocp (typ) (A) 1000 1000 1000 1000
Isd (typ) (uA) 65 65 65 65
Ron (typ) (mOhm) 200 200 200 200
Features Enable Input;OCP;OVP;SCP Enable Input;OCP;OVP;SCP Enable Input;OCP;OVP;SCP Enable Input;OCP;OVP;SCP
Package Type WDFN2x2-8 WDFN2x2-8 WDFN2x2-8 WDFN2x2-8
Features
  • Fully Integrated Protection Function
    ► Programmable OCP
    ► Input OVP
    ► Battery OVP
  • Withstand High Input Voltage Up to 30V
  • Over Voltage Turn Off Time Less Than 1us
  • High Accuracy Protection Thresholds
  • Over Temperature Protection
  • High Immunity of False Triggering Under Transients
  • Warning Indication Output
  • Enable Input
  • Thermal Enhanced WDFN Package
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateShareDownload
Over Voltage Protection IC2009/03/27
Reliability
Title Last Update ShareDownload
Over Voltage Protection IC 2015/05/19
Technical Documents
TitleLast UpdateShareDownload
Power Mangement Components for Lithium-Ion Battery Powered Applications2018/11/15
Understanding the characteristics of Li-ion batteries and Richtek power management solutions2018/10/30
Additional Documents
Title Last Update ShareDownload
Power Management Components for Lithium-Ion Battery Powered Applications
鋰離子電池電源管理IC選擇指南
2019/02/21
TOP