XC9236 Torex Semiconductor, XC9236 Datasheet - Page 15

• Manufacturer Part Number: XC9236
• Description: 600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
• Manufacturer: Torex Semiconductor

■NOTE ON USE (Continued)
18. It may happen to enter unstable operation when the IC operation mode goes into continuous operation mode under the
17. Please note the inductance value of the coil. The IC may enter unstable operation if the combination of ambient
14. In order to stabilize V
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.
condition of small input-output voltage difference. Care must be taken with the actual design unit.
connected as close as possible to the V
Please verify with actual parts.
In the operation range close to the maximum duty cycle, The IC may happen to enter unstable output voltage operation
temperature, setting voltage, oscillation frequency, and L value are not adequate.
even if using the L values listed below.
IN
’s voltage level and oscillation frequency, we recommend that a by-pass capacitor (C
IN
& V
SS
pins.
<External Components>
<External Components>
●The Range of L Value
*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.
3.0MHz
1.2MHz
FOSC
0.8V＜V
XC9235/XC9236/XC9237
V
2.5V＜V
OUT
V
≦2.5V
OUT
OUT
<4.0V
OUT
1.0μH～2.2μH
3.3μH～6.8μH
4.7μH～6.8μH
IN
L Value
) be
15/28
Series