0.8A Step Down / Step Up / Inverting DC-DC Converter MC34063C
ELECTRICAL CHARACTERISTICS( Refer to the test circuits, VCC=5V, Ta= -40℃ to 85℃
OSCILLATOR
Frequency V
= 0 V ,C
= 100pF ,T
= 25
Charge Current V
= 5 to 40V ,T
= 25oC
Discharge Current V
= 5 to 40V ,T
= 25oC
Discharge to Charge Current Ratio Pin 7= V
,T
= 25oC
Current Limit Sense Voltage I
= I
,T
= 25oC
OUTPUT SWITCH (NOTE 3)
Saturation Voltage,
Darlington connection
ISW= 1A ,R
in8= 82Ω to VCC,
Forced β ~ 20
DC Current Gain I
= 1A, V
= 5V, T
= 25oC
Collector Off-State Current VCE= 40V
COMPARATOR
T
= 25oC
Ta= TLOW to THIGH
Threshold Voltage Line Regulation VCC= 3 to 40V
Input Bias Current VIN= 0V
TOTAL DEVICE
VCC= 5 to 40V, CT=1㎋
Pin7= VCC ,V
in5>Vth, Pin2=GN
Remaining pins open
for MC34063C
Notes:
1Stresses
reater than those listed under "Absolute Maximum Ratin
s" ma
cause
ermanent dama
e to the devi
These are stress retin
s onl
, and functional o
eration of the device at these or an
other conditions be
ond tho
indicated under "Recommended O
eratin
Conditions" is not im
lied. Ex
osure to "Absolute Maximum Ratin
s" f
extended periods may affect device reliability.
2Maximum package power dissipation limits must be observed.
3Low duty cycle pulse technique are used during test to maintain juntion temperature as close to ambient
Temperature as possible.
4If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents (≤300mA) and
high driver currents (≥30mA), it may take up to 2.0 ㎲for it to come out of saturation. This condition will shorten
the off time at frequencies 30kHz, and is magnified at high temperatures. This condition does not occur with a
Darlington configuration, since the output switch cannot saturate.
Jan. 2007-Rev 1.0 HTC
1.25
VCE(sat)
VCE(sat)
Vth
Saturation Voltage (NOTE 4)
ISW= 1A ,Pins 1,8 connected
Threshold Voltage V
1.29
3
ICC Supply Current
TYP.
1.21
SYMBOL PARAMETER
MAX. UNI
SYMBOL PARAMETER TEST CONDITIONS MIN.
2.5 4 ㎃
㎷
IIB -20 -400 ㎁
Regline 1.4 5
V
1.225 1.275
㎂
UNI
V
TEST CONDITIONS MIN. TYP. MAX.
IC(off) 0.01 100
hFE 50 75
0.45 0.8
TYP. MAX. UNI
1 1.3 V
SYMBOL PARAMETER TEST CONDITIONS MIN.
Vipk(sense) 250 300 350 ㎷
Idischg/Ichg 5.2 6.5 7.5
㎂
Idischg 180 240 290 ㎂
Ichg 30 38 45
TYP. MAX. UNI
FOSC 170 180 190 KHz
SYMBOL PARAMETER TEST CONDITIONS MIN.