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XC9235/XC9236/XC9237

Series

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The Range of L Value

FOSC

L Value

3.0MHz

1.0μH～2.2μH

3.3μH～6.8μH

1.2MHz

4.7μH～6.8μH

*When a coil less value of 4.7μH is used at

FOSC=1.2MHz or when a coil less value of 1.5μH is

used at FOSC=3.0MHz, peak coil current more easily

reach the current limit ILMI. In this case, it may

happen that the IC can not provide 600mA output

current.

■NOTE ON USE (Continued)

15. High step-down ratio and very light load may lead an intermittent oscillation.

16. During PWM / PFM automatic switching mode, operating may become unstable at transition to continuous mode.

Please verify with actual parts.

17. Please note the inductance value of the coil. The IC may enter unstable operation if the combination of ambient

temperature, setting voltage, oscillation frequency, and L value are not adequate.

In the operation range close to the maximum duty cycle, The IC may happen to enter unstable output voltage operation

even if using the L values listed below.

<External Components>

18. It may happen to enter unstable operation when the IC operation mode goes into continuous operation mode under the

condition of small input-output voltage difference. Care must be taken with the actual design unit.

<External Components>