The RT9731AZQW(2) from Richtek is a dual channel precision adjustable current limited power switch in 10 lead WDFN package. It is intended for applications where precision current limiting is required or heavy capacitive loads and short circuits are encountered. This device offers a programmable current limit threshold between 560mA and 2.8A per channel via an external resistor. The power switch's rising and falling times are controlled to minimize current surges during on/off transitions. Each channel of the RT9731AZQW(2) limits the output current to a safe level by switching into constant current mode whenever the output load exceeds the current limit threshold. The FLAG logic output of each channel independently asserts low during over current. It is typically used in USB ports/hubs, digital TV, set-top boxes, VOIP phones.
Feature
- 2.5V to 5.5V input voltage range, 0V to 5.5V chip enable voltage
- Active Low EN function, two separate current limiting channels
- Meets USB current limiting requirements
- Adjustable current limit from 560mA to 2.8A
- ±7.5% current limit accuracy at 2.8A, quadrant 2, follow EIA-481-D
- Two 44mohm high side MOSFETs
- 2µA maximum standby supply current
- Built-in soft-start, UL E219878 approved, nemko NO65969 approved
- Supply current of 0.1µA (switch Off, VOUT = open), switch on-resistance RDS(ON) of 44mohm
- Ambient temperature range from -40°C to 85°C
Applications
Signal Processing, Consumer Electronics, Portable Devices
