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RB070M-30TR

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

Seiko Instruments Inc 

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

VIN

ON/OFF

Circuit

Start-up

Circuit

CONT

Oscillation

Circuit

VOUT

SLOPE

Compensation

Internal

Power Supply

Current

Σ

STU Mode

Circuit VOUT CFB

Limit Circuit

Error Amplifier

FB

−

MUX

Switching

Control

Circuit

+

−

PWM

Comparator

+

Reference

Voltage

Source

VSS

VOUT

RFB1 COUT COUT

0.1 μF 10 μF

RFB2

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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