AN8049 データシートの表示（PDF） - Panasonic Corporation

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AN8049

1.8-volt 3-channel step-up, step-down, and polarity inverting DC-DC converter control IC

Panasonic Corporation 

Voltage Regulators

AN8049SH

I Application Notes (continued)

[9] Sequential operation

Sequential operation under the control of external capacitors

Delays can be provided in the startup times by inserting capacitors (CCTL) between the CTL pins and ground.

Delay time: tDLY = 1.26 (V) × CCTL (µF)/1.1 (µA) (s)

AN8049SH

VCTL ≈ VCC

CTL1

1.26 V

CTL2

CTL3

CCTL3

CCTL1

CCTL2

ch.1

CCTL1 < CCTL2 < CCTL3

ch.2

ch.3

Stop

Stop

Stop

Start

Start

Start

U.V.L.O. cleared

Figure 8. Sequential operation using external capacitors

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