MC34063AC (STMicroelectronics)
DC-DC converter control circuits

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DIP-8
SO-8
Features
Output switch current in excess of 1.5 A
2 % reference accuracy
Low quiescent current: 2.5 mA (typ.)
Operating from 3 V to 40 V
Frequency operation to 100 kHz
Active current limiting
MC34063AB, MC34063AC,
MC34063EB, MC34063EC
DC-DC converter control circuits
Datasheet - production data
Description
The MC34063A/E series is a monolithic control
circuit which delivers the main functions for DC-
DC voltage converting.
The device contains an internal temperature
compensated reference, comparator, duty cycle
controlled oscillator with an active current limit
circuit, driver and high current output switch.
Output voltage is adjustable through two external
resistors with a 2% reference accuracy.
Employing a minimum number of external
components, the MC34063A/E device series is
designed for step-down, step-up and voltage-
inverting applications.
DIP-8
MC34063ABN
MC34063ACN
MC34063EBN
MC34063ECN
Table 1. Device summary
Order codes
SO-8
MC34063ABD-TR
MC34063ACD-TR
MC34063EBD-TR
MC34063ECD-TR
April 2013
This is information on a product in full production.
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MC34063AC (STMicroelectronics)
DC-DC converter control circuits

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Contents
Contents
MC34063AB, MC34063AC, MC34063EB, MC34063EC
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
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DC-DC converter control circuits

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MC34063AB, MC34063AC, MC34063EB, MC34063EC
1 Diagram
Figure 1. Block diagram
Diagram
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DC-DC converter control circuits

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Pin configuration
2 Pin configuration
MC34063AB, MC34063AC, MC34063EB, MC34063EC
Figure 2. Pin connections
Pin n°
1
2
3
4
5
6
7
8
Symbol
SWC
SWE
TC
GND
CII
VCC
IPK
DRC
Table 2. Pin description
Name and function
Switch collector
Switch emitter
Timing capacitor
Ground
Comparator inverting input
Voltage supply
IPK sense
Voltage driver collector
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DC-DC converter control circuits

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MC34063AB, MC34063AC, MC34063EB, MC34063EC
3 Maximum ratings
Maximum ratings
Note:
Table 3. Absolute maximum ratings
Symbol
Parameter
VCC
VIR
VSWC
VSWE
VCE
VDC
IDC
ISW
PTOT
TJ
TSTG
TOP
Power supply voltage
Comparator input voltage range
Switch collector voltage
Switch emitter voltage (VSWC = 40V)
Switch collector to emitter voltage
Driver collector voltage
Driver collector current
Switch current
Power dissipation at TA = 25°C
for DIP-8
for SO-8
Operating junction temperature
Storage temperature range
Operating ambient temperature
range
for AC and EC
series
for AB series
for EB series
Value
50
-0.3 to 40
40
40
40
40
100
1.5
1.25
0.625
150
-40 to 150
0 to 70
-40 to 85
-40 to 125
Unit
V
V
V
V
V
V
mA
A
W
°C
°C
°C
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 4. Thermal data
Symbol
Parameter
DIP-8
RthJA Thermal resistance junction-ambient (1)
100
RthJC Thermal resistance junction-case
42
1. This value depends from thermal design of PCB on which the device is mounted.
SO-8
160
20
Unit
°C/W
°C/W
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Electrical characteristics
MC34063AB, MC34063AC, MC34063EB, MC34063EC
4 Electrical characteristics
Refer to the test circuits, VCC = 5 V, TA = TLOW to THIGH, unless otherwise specified. (a)
Symbol
Parameter
Table 5. Oscillator
Test conditions
fOSC
Frequency
ICHG
Charge current
IDISCHG Discharge current
IDISCHG/ICHG
Discharge to charge
current ratio
VPIN5 = 0V, CT = 1 nF, TA = 25°C
VCC = 5 to 40V, TA = 25°C
VCC = 5 to 40V, TA = 25°C
PIN 7 = VCC, TA = 25°C
VIPK(sense) Current limit sense voltage ICHG = IDISCHG, TA = 25°C
Min. Typ. Max. Unit
24 33 42 kHz
24 33 42 µA
140 200 260 µA
5.2 6.2 7.5 µA
250 300 350 mV
Symbol
Parameter
Table 6. Output switch
Test conditions
VCE(sat)
Saturation voltage, Darlington
connection
ISW = 1 A, PIN 1, 8 connected
VCE(sat) Saturation voltage
ISW = 1 A, RPIN8 = 82 to VCC
Forced ~ 20
hFE
IC(off)
DC current gain
Collector off-state current
ISW = 1 A,VCE = 5 V, TA = 25°C
VCE = 40 V
Min. Typ. Max. Unit
1 1.3 V
0.45 0.7
V
50 120
0.01 100 µA
Symbol
Parameter
VTH Threshold voltage
Regline
IIB
Threshold voltage line
regulation
Input bias current
Table 7. Comparator
Test conditions
TA = 25°C
TA = TLOW to THIGH
VCC = 3 to 40 V
VIN = 0 V
Min.
1.225
1.21
Typ.
1.25
Max.
1.275
1.29
Unit
V
1 5 mV
-5 -400 nA
6/23
a. TLOW = 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)
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MC34063AB, MC34063AC, MC34063EB, MC34063EC
Electrical characteristics
Table 8. Total device
Symbol
Parameter
Test conditions
Min. Typ.
ICC Supply current
VSTART-UP Start-up voltage (1)
VCC = 5 to 40 V
CT = 1 nF
PIN 7 = VCC
VPIN5 >VTH
PIN 2 = GND
Remaining pins
open
for MC34063A
for MC34063E
TA = 25°C
for MC34063A
CT = 1 µF, PIN 5 = 0 for MC34063E
2.5
1.5
2.1
1.5
1. Start-up voltage is the minimum power supply voltage at which the internal oscillator begins to work.
Max.
4
4
Unit
mA
V
Note:
Maximum package power dissipation limit must be observed.
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 of output current switch = ICOUTPUT/(ICDRIVER - 1 mA) 10
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Typical performance characteristics
MC34063AB, MC34063AC, MC34063EB, MC34063EC
5 Typical performance characteristics
Figure 3. Emitter follower configuration output
saturation voltage vs. emitter current
Figure 4. Output switch ON-OFF time vs.
oscillator timing capacitor
Figure 5. Common emitter configuration output
switch saturation voltage vs. collector current
Figure 6. Darlington configuration collector
emitter saturation voltage (VCEsat) vs.
temperature
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DC-DC converter control circuits

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MC34063AB, MC34063AC, MC34063EB, MC34063EC
Typical performance characteristics
Figure 7. Power collector emitter saturation Figure 8. Current limit sense voltage (VIPK) vs.
voltage (VCEsat) vs. temperature
temperature
Figure 9. Reference voltage vs. temperature
Figure 10. Bias current vs. temperature
Figure 11. Supply current vs. temperature
Figure 12. Supply current vs. input voltage
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Typical application circuit
MC34063AB, MC34063AC, MC34063EB, MC34063EC
6 Typical application circuit
Figure 13. Step-up converter
Figure 14. Printed evaluation board
PIN 1 = VOUT
PIN 2 = GND
PIN 3 = GND
PIN 4 = VIN
Test
Line Regulation
Load Regulation
Output Ripple
Efficiency
Table 9. Test condition (VOUT = 28 V)
Conditions
VIN = 8 to 16 V, IO = 175 mA
VIN = 12 V, IO = 75 to 175 mA
VIN = 12 V, IO = 175 mA
VIN = 12 V, IO = 175 mA
Value (Typ.)
30
10
300
89
Unit
mV
mV
mV
%
10/23
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MC34063AB, MC34063AC, MC34063EB, MC34063EC
Typical application circuit
Figure 15. Step-down converter
Figure 16. Printed evaluation board
PIN 1 = VOUT
PIN 2 = GND
PIN 3 = GND
PIN 4 = VIN
Test
Line regulation
Load regulation
Output ripple
Efficiency
ISC
Table 10. Test condition (VOUT = 5 V)
Conditions
VIN = 15 to 25 V, IO = 500 mA
VIN = 25 V, IO = 50 to 500 mA
VIN = 25 V, IO = 500 mA
VIN = 25 V, IO = 500 mA
VIN = 25 V, RLOAD = 0.1
Value (typ.)
5
30
100
80
1.2
Unit
mV
mV
mV
%
A
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Typical application circuit
MC34063AB, MC34063AC, MC34063EB, MC34063EC
Figure 17. Voltage inverting converter
Figure 18. Printed evaluation board
PIN 1 = VOUT
PIN 2 = GND
PIN 3 = GND
PIN 4 = VIN
Test
Line regulation
Load regulation
Output ripple
Efficiency
ISC
Table 11. Test condition (VOUT = 12 V)
Conditions
VIN = 4.5 to 6 V, IO = 100 mA
VIN = 5 V, IO = 10 to 100 mA
VIN = 5 V, IO = 100 mA
VIN = 5 V, IO = 100 mA
VIN = 5 V, RLOAD = 0.1
Value (typ.)
15
20
230
58
0.9
Unit
mV
mV
mV
%
A
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MC34063AB, MC34063AC, MC34063EB, MC34063EC
Typical application circuit
Parameter
Table 12. Calculation
Step-Up
(Discontinuous mode)
Step-Down
(Continuous mode)
Voltage Inverting
(Discontinuous mode)
ton/toff
V-----O----UV---T-I--N--+----m-V---i-Fn----–--–---V--V--I--Ns---a--m-t----i-n---
-V----I-N------m----Vi--n--O----–U----VT----s+---a--V-t---–-F---V-----O----U---T--
--V-V---O-I--N-U----–T----V--+--s---Va---t-F-
(ton + toff) max
CT
IPK(switch)
RSC
1/fmin
4.5x10-5ton
2Iout(max)[(ton/toff)+1]
0.3/IPK(switch)
1/fmin
4.5x10-5ton
2Iout(max)
0.3/IPK(switch)
1/fmin
4.5x10-5ton
2Iout(max)[(ton/toff)+1]
0.3/IPK(switch)
CO
V-----r--i-Ip--o-p--u-l-e-t-t--o-p--n-----p---
I--P----K----8-s---Vw----ir-t-i-cp--h-p---l--e--t--op--n-----+-p---t--o---f--f--
V-----r--i-Ip--o-p--u-l-e-t-t--o-p--n-----p---
L(min)
V-----I-IN--P----Km----i-s-n--w---i-–-t-c--V-h---s---a---t tonmin
V----I-N------m---I-i-P-n--K----–--s--Vw----is--t-ac---ht---–----V-----o---u--t tonmin
V-----I-IN--P----Km----i-s-n--w---i-–-t-c--V-h---s---a---t tonmin
Note:
VSAT = Saturation voltage of the output switch
VF = Forward voltage drop of the output rectifier
The following power supply characteristics must be chosen:
VIN = Nominal input voltage
VOUT = Desired output voltage, |VOUT| = 1.25 (1 + R2/R1)
IOUT = Desired output current
fMIN = Minimum desired output switching frequency at the selected values of VIN and IO
VRIPPLE = Desired peak to peak output ripple voltage. In practice, the calculated capacitor
value will and to be increased due to its equivalent series resistance and board layout. The
ripple voltage should be kept to a low value since it will directly affect the line and load
regulation.
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Typical application circuit
MC34063AB, MC34063AC, MC34063EB, MC34063EC
Figure 19. Step-up with external NPN switch
Figure 20. Step-down with external NPN switch
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MC34063AB, MC34063AC, MC34063EB, MC34063EC
Typical application circuit
Figure 21. Step-down with external PNP switch
Figure 22. Voltage inverting with external NPN switch
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Typical application circuit
MC34063AB, MC34063AC, MC34063EB, MC34063EC
Figure 23. Voltage inverting with external PNP saturated switch
Figure 24. Dual output voltage
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MC34063AB, MC34063AC, MC34063EB, MC34063EC
Typical application circuit
Figure 25. Higher output power, higher input voltage
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DC-DC converter control circuits

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Package mechanical data
MC34063AB, MC34063AC, MC34063EB, MC34063EC
7 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
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MC34063AB, MC34063AC, MC34063EB, MC34063EC
Package mechanical data
Dim.
A
a1
B
B1
b
b1
D
E
e
e3
e4
F
I
L
Z
Plastic DIP-8 mechanical data
Min.
0.7
1.39
0.91
0.38
0.44
mm.
Typ.
3.3
0.5
8.8
2.54
7.62
7.62
3.3
Max.
1.65
1.04
0.5
9.8
Min.
0.028
0.055
0.036
0.015
7.1
4.8
1.6 0.017
inch.
Typ.
0.130
0.020
0.346
0.100
0.300
0.300
0.130
Max.
0.065
0.041
0.020
0.386
0.280
0.189
0.063
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Package mechanical data
MC34063AB, MC34063AC, MC34063EB, MC34063EC
Dim.
A
A1
A2
B
C
D
E
e
H
h
L
k
ddd
SO-8 mechanical data
Min.
1.35
0.10
1.10
0.33
0.19
4.80
3.80
5.80
0.25
0.40
mm.
Typ.
1.27
Max.
1.75
0.25
1.65
0.51
0.25
5.00
4.00
Min.
0.053
0.04
0.043
0.013
0.007
0.189
0.150
6.20 0.228
0.50 0.010
1.27 0.016
8° (max.)
0.1
inch.
Typ.
0.050
Max.
0.069
0.010
0.065
0.020
0.010
0.197
0.157
0.244
0.020
0.050
0.04
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MC34063AB, MC34063AC, MC34063EB, MC34063EC
Package mechanical data
Dim.
A
C
D
N
T
Ao
Bo
Ko
Po
P
Tape & reel SO-8 mechanical data
Min.
12.8
20.2
60
8.1
5.5
2.1
3.9
7.9
mm.
Typ.
Max.
330
13.2
22.4
8.5
5.9
2.3
4.1
8.1
Min.
0.504
0.795
2.362
0.319
0.216
0.082
0.153
0.311
inch.
Typ.
Max.
12.992
0.519
0.882
0.335
0.232
0.090
0.161
0.319
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Revision history
8 Revision history
MC34063AB, MC34063AC, MC34063EB, MC34063EC
Date
20-Nov-2007
24-Apr-2013
Table 13. Document revision history
Revision
Changes
10 Added Table 1.
11 Removed note Table 1 on page 1.
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MC34063AB, MC34063AC, MC34063EB, MC34063EC
Please Read Carefully:
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