S8363 datasheet(10/50 Pages) SII

Part #	S8363

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

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Manufacturer	SII [Seiko Instruments Inc]

Direct Link	http://www.sii.co.jp

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

S-8363 Series

Rev.2.0_01

10

2. 3 Schottky barrier diode

A schottky barrier diode (SD) is necessary to operate the S-8363 Series. The VOUT pin also works as the

power supply pin. The voltage applied on the VOUT pin when

OFF

/

ON

= “L” is VIN

− VD. VD is forward voltage

for step-down of SD, and largely varies depending on the forward current If of SD and ambient temperature, but

Vd is approx. 0.2 V to 0.5 V.

When the S-8363 Series startups from 0.9 V, use a SD with specially low VD. When using CRS08 for the

S-8363 Series, start-up is guaranteed when Ta =

+25°C and a load current of 1 mA.

Satisfy the following conditions when using other SDs.

• Low forward voltage (VD)

• High switching speed

• Reverse withstand voltage of VOUT + spike voltage or more

• Rated current of IPK or more

Table 7 Typical Schottky Diodes

Manufacturer

Name

TOSHIBA CORPORATION

CRS02

CRS08

ROHM Co., Ltd.

RB161M-20TR

RB051LA-40TR

RB070M-30TR

RB161SS-20T2R

Remark

Generally, in diodes with low forward volage VD, reverse leakage current Ir tends to increases.

Especially, increase of Ir in high temperature is significant. To prevent decrease in efficiency, choose a

diode with low Ir when low voltage start-up is unnecessary.

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