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 

AN8049SH

Voltage Regulators

I Terminal Equivalent Circuits (continued)

Pin No.

Equivalent circuit

Description

I/O

7

CTL1:

I

Controls the on/off state of channel 1. A delay

can be provided in the power supply turn-on start

VCC

time by connecting a capacitor between this pin

20 kΩ 1.1 µA

High

Channel 1

1.26 V output operation

and ground.

(See the "Application Notes, [9]" section.)

tDLY3 = 1.26 (V) × CCTL1 (µF)/1.1 (µA) (s)

This pin can also be used to control the on/off

state with an external signal. In that case, the

7

allowable input voltage range is from 0 V to VCC.

Note that during U.V.L.O. and timer latch

operation, this pin is connected to ground through

a 20 kΩ resistor.

8

Off:

I

100 kΩ

8

Start and stop of

internal circuits.

Controls the on/off state.

When the input is high: normal operation

(VOFF > 1.2 V)

When the input is low: standby mode

(VOFF < 0.6 V)

In standby mode, the total current consumption

is held to under 1 µA.

9

VREF:

O

VCC

Outputs the internal reference voltage.

The reference voltage is 1.26 V (allowance:

±1%) when VCC is 2.4 V and IREF is − 0.1 mA.

9

Insert a capacitor of at least 0.1 µF between VREF

and ground for phase compensation.

10

16

RB2:

I

Connection for a resistor that sets the channel 2

output current.

Use a resistor in the range 750 Ω to 15 kΩ.

ISO(OUT)2

200 Ω

10

ISI(OUT)2

13

30 kΩ

11

16

RB1:

I

Connection for a resistor that sets the channel 1

output current.

Use a resistor in the range 750 Ω to 15 kΩ.

ISO(OUT)1

200 Ω

11

ISI(OUT)1

12

30 kΩ

8

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