S-9365AAAAAI6TIG2 SII [Seiko Instruments Inc], S-9365AAAAAI6TIG2 Datasheet - Page 21

• Manufacturer Part Number: S-9365AAAAAI6TIG2
• Description: STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
• Manufacturer: SII [Seiko Instruments Inc]

Rev.1.1
STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
2. Diode
3. Input capacitor (C
4. Capacitor for setting short-circuit protection delay time (CSP) (products with short-circuit
Use an externally mounted that meets the following conditions.
• Low forward voltage (Schottky barrier diode or similar type)
• High switching speed
• Reverse withstand voltage of V
• Rated current of I
To improve efficiency, an input capacitor (C
Select C
S-8365/8366 Series.
An output capacitor (C
the step-down type because the current is intermittently supplied from the input to the output side in the step-up
type. A 22 µF ceramic capacitor is recommended for the S-8365/8366 Series. However, a higher capacitance is
recommended if the output voltage is high or the load current is large. If the output voltage or load current is low,
about 10 µF can be used without problems.
Select C
A ceramic capacitor can be used for both the input and output.
protection)
For the S-8365/8366 Series, the short-circuit protection delay time can be set to any value by using an external
capacitor. Connect the capacitor between the CSP and VSS pins. Select the capacitor value according to the
equation below and Figure 18.
Note, however, that the equation and figure show a theoretical value assuming an ideal capacitor value and typ. IC
conditions. Variations of the capacitor and IC are not considered.
For the IC variations, see the short-circuit protection delay time (t
CSP [µF] ≅
_00
OUT
IN
according to the impedance of the power supply used. The recommended capacitance is 10 µF for the
after sufficient evaluation with actual application.
t
PRO
PK
[ms] × 1.2 × 10
IN
or more
) and output capacitor (C
OUT
0.6
), which is used to smooth the output voltage, requires a capacitance larger than that of
OUT
− 3
+ spike voltage or more
Seiko Instruments Inc.
IN
) lowers the power supply impedance and averages the input current.
OUT
)
PRO
120
100
80
60
40
20
0
) in “
0
Figure 18 CSP vs. t
Electrical Characteristics”.
0.05
0.10
CSP [µF]
S-8365/8366 Series
0.15
PRO
0.20
0.25
21