S-8363B-I6T1U2 Datasheet, PDF (21/50 Pages) Seiko Instruments Inc – PWM/PFM SWITCHABLE SWITCHING REGULATOR

STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_01
S-8363 Series
 Standard Circuit
ON/OFF
VIN
VIN _CIN
L = 2.2 μH
SD
V_IN
ON/OFF
Circuit
Start-up
Circuit
CONT
Oscillation
Circuit
VOUT
SLOPE
Compensation
Internal
Power Supply
Current
Σ
STU Mode
Circuit V_OUT CFB
Limit Circuit
Error Amplifier
FB
−
MUX
Switching
Control
Circuit
+
−
PWM
Comparator
+
Reference
Voltage
Source
VSS
V_OUT
R_{FB1 COUT COUT}
0.1 μF 10 μF
R_FB2
Ground point
Figure 18
Caution The above connection diagram and constant will not guarantee successful operation. Perform
thorough evaluation using an actual application to set the constants.
 Precaution
• Mount external capacitors and inductor as close as possible to the IC. Set single point ground.
• Characteristics ripple voltage and spike noise occur in IC containing switching regulators. Moreover rush current
flows at the time of a power supply injection. Because these largely depend on the inductor, the capacitor and
impedance of power supply used, perform sufficient evaluation with actual application.
• The 0.1 μF capacitor connected between the VOUT and VSS pins is a bypass capacitor. It stabilizes the power
supply in the IC when application is used with a heavy load, and thus effectively works for stable switching
regulator operation. Allocate the bypass capacitor as close to the IC as possible, prioritized over other parts.
• Although the IC contains a static electricity protection circuit, static electricity or voltage that exceeds the limit of
the protection circuit should not be applied.
• The power dissipation of the IC greatly varies depending on the size and material of the board to be connected.
Perform sufficient evaluation using an actual application before designing.
• SII Semiconductor Corporation claims no responsibility for any disputes arising out of or in connection with any
infringement by products including this IC of patents owned by a third party.
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