S-8353A20MC-IQFT2X Datasheet, PDF (25/49 Pages) Seiko Instruments Inc – BUILT-IN TRANSISTOR SWITCHING REGULATOR

STEP-UP, PWM CONTROL or PWM / PFM SWITCHABLE BUILT-IN TRANSISTOR SWITCHING REGULATOR
Rev.3.0_01
S-8353/8354 Series
 Application Circuits
1. Using Ceramic Capacitor Example
When using small RESR parts such as ceramic capacitors for the output capacitance, mount a resistor (R1)
corresponding to the RESR in series with the ceramic capacitor (CL) as shown in Figure 16.
R1 differs depending on L value, the capacitance, the wiring, and the application (output load).
The following example shows a circuit using R1 = 100 mΩ, output voltage = 3.3 V, output load = 100 mA and its
characteristics.
V_IN
C_IN
L
CONT
SD
VOUT
V_OUT
R₁
VSS
C_L
Figure 16 Using Ceramic Capacitor Circuit Example
IC
S-8353A33
L Type Name
CDRH5D28-101
Table 19
SD Type Name
MA2Z748
CL
(Ceramic capacitor)
10 μF × 2
R1
100 mΩ
Caution The Above connection diagram and constant will not guarantee successful operation. Perform
through evaluation using the actual application to set the constant.
25