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RT9709

RichTek
Part Number RT9709
Manufacturer RichTek
Description Integrated Over Voltage Protection Circuit
Published Mar 31, 2015
Detailed Description RT9709 Integrated Over Voltage Protection Circuit General Description The RT9709 is an integrated circuit (IC) optimiz...
Datasheet PDF File RT9709 PDF File

RT9709
RT9709

Overview
RT9709 Integrated Over Voltage Protection Circuit General Description The RT9709 is an integrated circuit (IC) optimized to protect low voltage system from abnormal high voltage input up to 28V.
The IC monitors the input voltage, battery voltage and the charging current to make sure all three parameters are operated in normal range.
It also monitors its own temperature and turns the MOSFET off when the chip temperature exceeds 140°C.
The RT9709 can supportAC charger or USB charger.
When the input voltage exceeds the OVP threshold, the IC turns off the MOSFET within 1us to remove the power before any damage occurs.
The current in the 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 has a 4-bit binary counter that accumulates during an OCP event.
When the total count reaches 16 times, the MOSFET will be turned off permanently unless the input power is recycled.
The IC also monitors the battery voltage VB.
When the battery voltage exceeds 4.
4V and last for more than 180us the RT9709 will turn off the MOSFET.
The internal logic control will turn off and latch the MOSFET when the battery over-voltage event reaches 16 times.
Pin Configurations (TOP VIEW) VIN 1 VIN 2 GND 3 WRN 4 NC 5 NC 6 GND 13 12 NC 11 VOUT 10 VOUT 9 ILIM 8 VB 7 EN WDFN-12L 4x3 VIN 1 VIN 2 GND 3 WRN 4 NC 5 GND 11 9 10 VOUT 9 VOUT 8 ILIM 7 VB EN WDFN-10L 3x3 Features z Fully Integrated Protection Circuit for Three Protection Variables ` User Programmable OCP Threshold ` Input OVP Less than 1us ` Battery OVP z Up to 30V Over Voltage Protection z High Accuracy Protection Threshold z High Immunity of False Triggering Under Transients z Warning Indication Output z Enable Input z Thermally Enhanced WDFN Package z RoHS Compliant and Halogen Free Applications z Cellular Phones z Digital Cameras z PDAs and Smart Phones z Portable Instruments Ordering Information RT9709...


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