L4963 データシートの表示（PDF） - STMicroelectronics

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L4963

1.5A SWITCHING REGULATOR

STMicroelectronics 

L4963 - L4963D

PIN FUNCTIONS

SO20L

Power DIP

1

1

2

2

3

3

4, 5, 6, 7

14, 15, 16, 17

4, 5, 6

13, 14, 15

8

7

9

8

10

9

11

10

12

11

13

12

18

16

19

17

20

18

Name

Description

SIGNAL SUPPLY VOLTAGE Must be Connected to pin 3

OUTPUT

Regulator output

SUPPLY VOLTAGE

Unregulated voltage input. An internal regulator

powers the internal logic.

GROUND

Common ground terminal

POWER FAIL INPUT

POWER FAIL OUTPUT

RESET DELAY

RESET OUTPUT

REFERENCE VOLTAGE

FEEDBACK INPUT

INHIBIT INPUT

C OSCILLATOR

R OSCILLATOR FREQ.

Input of the power fail circuit. The threshold can be

modified introducing an external voltage divider

between the Supply Voltage and GND.

Open collector power fail signal output. This output

is high when the supply voltage is safe.

A capacitor connected between this terminal and

ground determines the reset signal delay time.

Open collector reset signal output. This output is

high when the output voltage value is correct.

Reference voltage output.

Feedback terminal of the regulation loop.

The output is connected directly to this terminal for

5.1V operation; it is connected via a divider for

higher voltages.

TTL level remote inhibit. A logic low level on this

input disables the device.

Oscillator waveform. A capacitor connected

between this terminal and ground modifies the

maximum oscillator frequency.

A resistor connected between this terminal and

ground defines the maximum switching frequency.

THERMAL DATA

Symbol

Parameter

Rth j-pins

Rth j-amb

(*) See Fig. 28

Thermal Resistance Junction to Pins

Thermal Resistance Junction to Ambient (*)

max.

max.

SO20

15

85

Powerdip

12

80

Unit

°C/W

°C/W

3/17

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