STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR

S-8363 Series

21



Standard Circuit

Error Amplifier

VOUT

CONT

VSS

VIN

ON/OFF

Internal

Power Supply

ON/OFF

Circuit

Switching

Control

Circuit

Reference

Voltage

Source

PWM

Comparator

Σ

SD

+

−

FB

Current

Limit Circuit

Oscillation

Circuit

SLOPE

Compensation

STU Mode

Circuit

MUX

+

−

Start-up

Circuit

L = 2.2

μH

10

μF

Ground point

0.1

μF

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.