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OPERATIONAL EXPLANATION

<Output Voltage Control>

The voltage divided by resistors R1 & R2 is compared with the internal reference voltage by the error amplifier. The

protect circuit operate in relation to the level of output current. Further, the IC's internal circuitry can be shutdown via the

CE pin's signal

<Low ESR Capacitors>

With the XC6209/6212 series, a stable output voltage is achievable even if used with low ESR capacitors as a phase

compensation circuit is built-in. In order to ensure the effectiveness of the phase compensation, we suggest that an output

Stable phase compensation may not be ensured if the capacitor runs out capacitance when depending on bias and

temperature. In case the capacitor depends on the bias and temperature, please make sure the capacitor can ensure the

actual capacitance.

<Current Limiter, Short-Circuit Protection>

The XC6219/6211 series includes a combination of a fixed current limiter circuit & a foldback circuit, which aid the operations

of the current limiter and circuit protection. When the load current reaches the current limit level, the fixed current limiter

circuit operates and output voltage drops. As a result of this drop in output voltage, the foldback circuit operates, output

voltage drops further and output current decreases. When the output pin is shorted, a current of about 50mA flows.

<CE Pin>

The IC's internal circuitry can be shutdown via the signal from the CE pin with the XC6219/6211 series. In shutdown mode,

(please refer to the selection guide). Note that as the standard XC6219/6211B type's regulator 1 and 2 are both ' High

Active/No Pull-Down', operations will become unstable with the CE pin open. Although the CE pin is equal to an inverter input

with CMOS hysteresis, with either the pull-up or pull-down options, the CE pin input current will increase when the IC is in

the correct specifications for the CE pin, the operational logic is fixed and the IC will operate normally. However, supply

current may increase as a result of through current in the IC's internal circuitry.

1. Please use this IC within the stated absolute maximum ratings. The IC is liable to malfunction should the ratings be

exceeded.

2. Where wiring impedance is high, operations may become unstable due to noise and/or phase lag depending on output

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NOTES ON USE