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MC34063ABD Datasheet(Fiches technique) 3 Page - STMicroelectronics

Numéro de pièce MC34063ABD
Description  DC-DC CONVERTER CONTROL CIRCUITS
Télécharger  15 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
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ELECTRICAL CHARACTERISTICS (Refer to the test circuits, VCC = 5V, Ta = TLOW to THIGH, unless
otherwise specified, see note 2)
OSCILLATOR
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
fOSC
Frequency
Vpin5 = 0 V
CT = 1 nF
Ta = 25
oC
243342
KHz
Ichg
Charge Currernt
VCC = 5 to 40 V
Ta = 25
oC
24
33
42
µA
Idischg
Discharge Current
VCC = 5 to 40 V
Ta = 25
oC
140
200
260
µA
Idischg/Ichg Discharge to Charge
Current Ratio
Pin 7 = VCC
Ta = 25
oC
5.2
6.2
7.5
Vipk(sense) Current Limit Sense Voltage
Ichg = Idischg
Ta = 25
oC
250
300
350
mV
OUTPUT SWITCH
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VCE(sat)
Saturation Voltage,
Darlington Connection
ISW = 1 A
Pins 1, 8 connected
1
1.3
V
VCE(sat)
Saturation Voltage
ISW = 1 A
Rpin8 = 82
Ω to VCC,
Forced
β ~ 20
0.45
0.7
V
hFE
DC Current Gain
ISW = 1 A
VCE = 5 V
Ta = 25
oC50
120
IC(off)
Collector Off-State Current
VCE = 40 V
0.01
100
µA
COMPARATOR
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Vth
Threshold Voltage
Ta = 25
oC
Ta = TLOW to THIGH
1.225
1.21
1.25
1.275
1.29
V
V
Regline
Threshold Voltage Line
Regulation
VCC = 3 to 40 V
1
5
mV
IIB
Input Bias Current
VIN = 0 V
-5
-400
nA
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
for MC34063E
2.5
1.5
4
4
mA
mA
VSTART-UP Start-up Voltage (note 4)
Ta = 25
oC
CT = 1
µF
Pin 5 = 0 V
for MC34063A
for MC34063E
2.1
1.5
V
V
NOTES:
1) Maximum package power dissipation limit must be observed.
2) TLOW = 0
oC, THIGH = 70 oC (AC and EC series); TLOW = -40 oC, THIGH = 85 oC (AB series); TLOW = -40 oC, THIGH = 125 oC (EB series).
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 - 1mA*) ≥ 10
* Current less due to a built in 1K
Ω antileakage resistor.
4) Start-up Voltage is the minimum Power Supply Voltage at which the internal oscillator begins to work.
MC34063A/E
3/15




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