063EC datasheet(7/23 Pages) STMICROELECTRONICS

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MC34063AB - MC34063AC - MC34063EB - MC34063EC

Electrical characteristics

7/23

Note:

Maximum package power dissipation limit must be observed.

2TLOW = 0 °C, THIGH = 70 °C (AC and EC series); TLOW = -40 °C, THIGH = 85 °C (AB series);

TLOW = -40 °C, THIGH = 125 °C (EB series).

If darlington configuration is not used, care must be taken to avoid deep saturation of output

switch. The resulting switch-off time may be adversely affected. In a darlington configuration

the following output driver condition is suggested:

Forced

β of output current switch = ICOUTPUT/(ICDRIVER - 1 mA

(a))

≥ 10

Start-up voltage is the minimum power supply voltage at which the internal oscillator begins

to work.

Table 8.

Total device

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

ICC

Supply current

VCC = 5 to 40 V

CT = 1 nF

PIN 7 = VCC

VPIN5 >VTH

PIN 2 = GND

Remaining pins

open

for MC34063A

2.5

1.5

for MC34063E

VSTART-UP Start-up voltage (Note 4)

TA = 25°C

CT = 1 µF, PIN 5 = 0

for MC34063A

2.1

for MC34063E

1.5

Current less due to a built in 1 k

Ω anti leakage resistor.

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