CH217

Part: CH217 from WCH

Type: USB Current-Limiting Power Distribution Switch Chip

Key Specs:

• ON-resistance: 70mΩ (typical)
• Current-limiting range: 400mA to 2.7A
• Supply voltage: 2.7V to 5.5V
• Quiescent operating current: 50uA (typical)
• Shutdown current: less than 1uA (typical)
• Operating Ambient Temperature: -40 to 85 °C
• Maximum Power Dissipation: 500 mW

Features:

• Built-in power switch, typical 70mΩ ON-resistance
• Current-limiting threshold adjustable via external resistor, supporting 400mA~2.7A, typical error ±10%
• Supports power supply voltage 2.7V~5.5V
• Fast current-limiting protection during output short circuit
• Low power consumption, typical 50uA quiescent operating current
• Typical shutdown current less than 1uA, no reverse current during shutdown
• Overcurrent protection
• Overtemperature protection
• Undervoltage protection
• SOT23-6 package

Applications:

• Power control of ports in computers
• USB hosts
• USB HUBs
• Chargers

Package:

• SOT23-6: Body Width 1.6mm, Pin Pitch 0.95mm

• Built-in power switch, typical 70mΩ ON-resistance.
• Current-limiting threshold adjustable via external resistor, supporting 400mA~2.7A, typical error ±10%.
• Supports power supply voltage 2.7V~5.5V.
• Fast current-limiting protection during output short circuit.
• Low power consumption, typical 50uA quiescent operating current.
• Typical shutdown current less than 1uA, no reverse current during shutdown.
• SOT23-6 package.
• 3、Package

The CH217 can be used for power control of ports in computers, USB hosts, USB HUBs, chargers, etc. The figure below shows an application for independent power distribution control of each port in a HUB. The EN# pin is controlled by the PWREN# signal of the HUB chip CH335 or CH334. The FLAG# pin can generate overcurrent or overtemperature alarm signals to notify the HUB controller and the computer. The CH334/5 has built-in pull-up resistors. In the figure, Rset is 56K, setting the current-limiting threshold to approximately 1A. The actual value should be selected based on the power supply capacity to achieve protection. The capacitance of C8 should be selected as needed, and C4/C5/C6/C7 typically can be 150uF.

When designing the PCB, consider the actual operating current carrying capacity. The PCB traces for VIN(+5V) and VOUT(VBUS*) should be as wide as possible. If vias are used, multiple vias are recommended, at least two or more in parallel.

9、Package Information

9.1. SOT23-6