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MC34063A Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers

Part No. MC34063A
Description  DC-DC Converter Control Circuits
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MC34063A Datasheet(HTML) 3 Page - List of Unclassifed Manufacturers

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DC-DC Converter Control Circuits
MC34063A
ELECTRICAL CHARACTERISTICS( Refer to the test circuits, V
CC=5V, Ta=TLOW to THIGH, unless
otherwise specified, see note 2)
OSCILLATOR
Frequency
Vpin5= 0 V ,CT= 1nF ,Ta= 25
oC
Charge Current
VCC= 5 to 40V ,Ta= 25
oC
Discharge Current
VCC= 5 to 40V ,Ta= 25
oC
Discharge to Charge Current Ratio
Pin 7= VCC ,Ta= 25
oC
Current Limit Sense Voltage
Ichg= Idischg ,Ta= 25
oC
OUTPUT SWITCH
Saturation Voltage,
ISW= 1A ,Pins 1,8 connected
Darlington connection
Saturation Voltage
ISW= 1A ,Rpin8= 82Ω to VCC,
Forced β ~ 20
DC Current Gain
ISW= 1A, VCE= 5V, Ta= 25
oC
Collector Off-State Current
VCE= 40V
COMPARATOR
Threshold Voltage
Ta= 25
oC
Ta= TLOW to THIGH
Threshold Voltage Line Regulation
VCC= 3 to 40V
Input Bias Current
VIN= 0V
TOTAL DEVICE
Supply Current
VCC= 5 to 40V, CT=1㎋
Pin7= VCC ,Vpin5>Vth, Pin2=GND
Remaining pins open
for MC34063A
Start-up Voltage(note 4)
Ta= 25
oC ,C
T=1㎌ ,Pin5= 0V
for MC34063A
Notes:
1) Maximum package power dissipation limit must be observed.
2) TLOW= 0
oC, T
HIGH= 70
oC
3) 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㎃
*)≥10
* Current less due to a built in 1KΩ antileakage resistor.
4) Start-up Voltage is the minimum Power Supply Voltage at which the internal oscillator begains to work.
HTC
TEST CONDITIONS
MIN.
TYP.
MAX. UNIT
FOSC
24
33
42
KHz
SYMBOL
PARAMETER
Idischg
140
200
260
Ichg
24
33
42
Vipk(sense)
250
300
350
Idischg/Ichg
5.2
6.2
7.5
UNIT
VCE(sat)
1
1.3
V
SYMBOL
PARAMETER
TEST CONDITIONS
MIN.
0.45
0.7
TYP.
MAX.
0.01
100
V
hFE
50
120
VCE(sat)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN.
TYP.
MAX. UNIT
IC(off)
Vth
1.225
1.25
1.275
15
V
1.21
1.29
V
TEST CONDITIONS
MIN.
IIB
-5
-400
Regline
TYP.
MAX. UNIT
ICC
2.5
4
SYMBOL
PARAMETER
VSTART-UP
2.1
V
3


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