Häufig gestellte Fragen (FAQ) |ROHM Semiconductor

FAQ Category

Terminal voltage input sequence

Input voltage (VIH / VIL)

Output terminal applied (short / voltage / current)

Input / output reversal (voltage / current)

Output capacitor

Detection and restriction of overcurrent protection (OCP)

EN (CTL, STBY, CE) terminal

Reduced voltage detection (UVLO / LVCC)

FAQ's

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When using high-side and low-side switch ICs as switches (3.3V) for SD, is the input voltage specification of the EN pin the same as when IN=5V?
- The specified input voltage value of the EN (CTRL) pin will not be the same since it is dependent on the supply voltage. When using with IN=3.3V refer to the following graphs in the datasheet. BD6520F and BD6522: Control Input Voltage vs Supply Voltage, BD6524HFV: EN Input Voltage vs Ambient Temperature, and for other models: EN, /EN Input Voltage vs Supply Voltage.

For high-side and low-side switch ICs, when a higher voltage is supplied to the OUT side than the IN side when the switch is OFF, will there be problems (i.e. backflow)?
- Backflow models:
  BD6538G、 BD2224G、 BD2225G、 BD2226G、 BD2227G、 BD2232G、 BD2233G、 BD6538G-LB、 BD2224G-LB、 BD2225G-LB、 BD2226G-LB、 BD2227G-LB、 BD2268G-M、 BD2269G-M、 BD82001FVJ、 BD82000FVJ、 BD82001FVJ-LB、 BD82000FVJ-LB、 BD82004FVJ-M、 BD82005FVJ-M、 BD2200GUL、 BD2201GUL、 BD2202G、 BD2206G、 BD6520F、 BD2202G-LB、 BD2206G-LB、 BUS1DJC0GWZ、 BUS1DJC3GWZ
  . With backflow models, if a higher voltage is supplied to OUT vs IN when the switch is OFF (EN=OFF), current may flow (i.e. through a parasitic diode), which can lead to deterioration and breakdown. If applying a higher voltage to OUT than IN, please use a model that can prevent backflow. Applicable models are described as providing 'reverse current protection while the switch is OFF' in the datasheet.
  Related Link：Technical Document

Is there a problem with connecting a large capacitance capacitor (C_L, USB standard 120uF or more) to the output of high-side and low-side switch ICs?
- There should be no problems even if a large capacitance capacitor (USB standard, 120uF or more) is connected to the output. However, when the IC turns ON and the output rises the capacitor C_L is charged, causing inrush current to flow. Depending on the value of C_L, the inrush current is restricted to the current limit value and the IC enters an overcurrent detection state. If the high-side switch IC continues in this state for more than the /OC pin (flag) output delay time, 'L' is output from the /OC pin.

What is the recovery method for high-side and low-side switch ICs equipped with an overcurrent limiting circuit latch after current limit is applied and the latch is OFF?
- One recovery method involves turning OFF the EN (CTRL) pin and then turning it ON again or turning the power supply OFF then ON, or going below V_TUVL(V_UVLOL) then above V_TUVH(V_UVLOH).

Explain the operation of UVLO for high-side and low-side switch ICs.
- UVLO is a function that forcibly turns OFF when the IN pin voltage drops below the UVLO threshold. The threshold has upper and lower hysteresis, and both upper and lower sides are set below the operating supply voltage.

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