S-8363 データシートの表示（PDF） - Seiko Instruments Inc

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S-8363

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

S-8363 Series

Rev.2.0_01

3. 2 VOUT voltage at start-up < STU release voltage

After ON / OFF =“H”, step-up starts by the start-up operation. When the VOUT voltage reaches the STU release

voltage, the soft-start starts.

Since the length of the start-up period largely varies depending on the input voltage, load current, external parts

and ambient temperature, the soft-start time varies according to them. Perform sufficient evaluation with actual

application.

Input voltage

(VIN)

0V

Output voltage

(VOUT)

STU release

Reference voltage

from

error amplifier

0V

0V

ON/OFF

voltage 0 V

Soft-start time (tss)

VOUT × 0.90

Start-up period

Soft-start period

Figure 11

Time [s]

12

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