Overview CH213 is a low dropout ideal diode chip with current limiting function. The chip has integrated modules for over-current protection, short-circuit protection, over-temperature protection, power supply polarity protection, etc. It supports DC applications with no more than 1A current at 5V, and can protect the power supply system by limiting the output current when an over-current condition such as a short-circuit occurs at the VO output, and can protect the load circuit at the VO output when the input power supply polarity is wrong. The CH213 is equivalent to a Schottky Barrier Diode plus a self-recovery fuse, but with a substantially lower on-voltage drop and more rapid over-current protection.
Internal Block Diagram
Features
- Built-in power switching tube, typical 160mΩ on-resistance.
- Low turn-on voltage and low dropout single conductor, typical voltage drop of 32mV at 200mA current.
- Support maximum on-current of about 1A at 5V and current limit of about 1.3A.
- Support power supply voltage 2.2V~5.5V.
- Typical 20uS fast current limit protection in case of output over-current or output short-circuit.
- Diode chip shutdown to protect the load circuit at the output in case of input power polarity error.
- Low-power consumption, typical 4uA quiescent operating current.
- No reverse conduction current in diode chip off state.
- Available in SOT23-3, SOT23-6, and DFN6 packages.
Application
As a low turn-on voltage and low on-state voltage drop diode chip, CH213 can be used in place of ordinary diodes in applications up to 500mA at 3V or 5V DC, providing power supply polarity protection against external power reversal, over-current and short-circuit protection and over-temperature protection, and achieving a low on-state voltage drop to reduce losses.
Package
Note: Pin 0# refers to the EPAD of the DFN package.
Note: CH213B contains two independent sets of ideal diodes, equivalent to two CH213Ks that share GND.