ST MC34063AB, MC34063AC, MC34063EB, MC34063EC User Manual

Features
Output switch current in excess of 1.5 A
2 % reference accuracy
Operating from 3 V to 40 V
Frequency operation to 100 kHz
Active current limiting
Description
The MC34063A/E series is a monolithic control circuit delivering 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.
MC34063AB - MC34063AC
MC34063EB - MC34063EC
DC/DC converter control circuits
DIP-8
designed for step-down, step-up and voltage­inverting applications.
SO-8
Employing a minimum number of external components the MC34063A/E devices series is

Table 1. Device summary

Order codes
DIP-8 SO-8
MC34063ABN
MC34063ACN
MC34063EBN MC34063EBD-TR
MC34063ECN MC34063ECD-TR
1. The "A" version is not recommended for new designs.
November 2007 Rev 10 1/23
(1)
(1)
MC34063ABD-TR
MC34063ACD-TR
www.st.com
23
Contents MC34063AB - MC34063AC - MC34063EB - MC34063EC
Contents
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
2/23
MC34063AB - MC34063AC - MC34063EB - MC34063EC Diagram

1 Diagram

Figure 1. Block diagram

3/23
Pin configuration MC34063AB - MC34063AC - MC34063EB - MC34063EC

2 Pin configuration

Figure 2. Pin connections

Table 2. Pin description

Pin n° Symbol Name and function
1 SWC Switch collector
2 SWE Switch emitter
3 TC Timing capacitor
4 GND Ground
5 CII Comparator inverting input
6VCCVoltage supply
7I
8 DRC Voltage driver collector
PK
IPK sense
4/23
MC34063AB - MC34063AC - MC34063EB - MC34063EC Maximum ratings

3 Maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit
V
V
V
V
SWC
SWE
V
V
I
DC
I
SW
CC
IR
CE
DC
Power supply voltage 50 V
Comparator input voltage range -0.3 to 40 V
Switch collector voltage 40 V
Switch emitter voltage (V
= 40V) 40 V
SWC
Switch collector to emitter voltage 40 V
Driver collector voltage 40 V
Driver collector current 100 mA
Switch current 1.5 A
for DIP-8 1.25
P
T
TOT
T
STG
Power dissipation at TA = 25°C
for SO-8 0.625
Operating junction temperature 150 °C
J
Storage temperature range -40 to 150 °C
W
for AC and EC series 0 to 70
T
OP
Operating ambient temperature range
°Cfor AB series -40 to 85
for EB series -40 to 125
Note: 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 SO-8 Unit
R
thJA
R
thJC
1. This value depends from thermal design of PCB on which the device is mounted.
Thermal resistance junction-ambient
Thermal resistance junction-case 42 20 °C/W
(1)
100 160 °C/W
5/23
Electrical characteristics MC34063AB - MC34063AC - MC34063EB - MC34063EC

4 Electrical characteristics

(Refer to the test circuits, V
= 5 V, TA = T
CC
LOW
to T
, unless otherwise specified, see
HIGH
Note 2)

Table 5. Oscillator

Symbol Parameter Test conditions Min. Typ. Max. Unit
f
OSC
I
CHG
I
DISCHG
I
DISCHG/ICHG
V
IPK(sense)
Frequency V
Charge current V
Discharge current V
Discharge to charge current ratio
Current limit sense voltage I
= 0V, CT = 1 nF, TA = 25°C 24 33 42 kHz
PIN5
= 5 to 40V, TA = 25°C 24 33 42 µA
CC
= 5 to 40V, TA = 25°C 140 200 260 µA
CC
PIN 7 = V
= I
CHG
, TA = 25°C 5.2 6.2 7.5 µA
CC
DISCHG, TA
= 25°C 250 300 350 mV

Table 6. Output switch

Symbol Parameter Test conditions Min. Typ. Max. Unit
V
CE(sat)
V
CE(sat)
h
I
C(off)
Saturation voltage, darlington connection
Saturation voltage
DC current gain ISW = 1 A,V
FE
Collector off-state current V
= 1 A, PIN 7, 8 connected 1 1.3 V
I
SW
= 1 A, R
I
SW
Forced β ~ 20
= 40 V 0.01 100 µA
CE
= 82 Ω to V
PIN8
= 5 V, TA = 25°C 50 120
CE
CC
0.45 0.7 V

Table 7. Comparator

Symbol Parameter Test conditions Min. Typ. Max. Unit
T
= 25°C 1.225 1.25 1.275
V
Reg
I
Threshold voltage
TH
Threshold voltage line
line
regulation
Input bias current V
IB
6/23
A
= T
T
A
V
CC
IN
to T
LOW
HIGH
= 3 to 40 V 1 5 mV
= 0 V -5 -400 nA
1.21 1.29
V
MC34063AB - MC34063AC - MC34063EB - MC34063EC Electrical characteristics

Table 8. Total device

Symbol Parameter Test conditions Min. Typ. Max. Unit
V
= 5 to 40 V
CC
for MC34063A 2.5 4 CT = 1 nF PIN 7 = V
I
CC
Supply current
V
PIN5
PIN 2 = GND
>V
TH
CC
mA
1.5 4for MC34063E
Remaining pins open
V
START-UP
Start-up voltage (Note 4)
= 25°C
T
A
= 1 µF, PIN 5 = 0
C
T
for MC34063A 2.1
V
for MC34063E 1.5
Note: 1 Maximum package power dissipation limit must be observed.
2T
T
LOW
LOW
= 0 °C, T
HIGH
= -40 °C, T
= 70 °C (AC and EC series); T
= 125 °C (EB series).
HIGH
= -40 °C, T
LOW
= 85 °C (AB series);
HIGH
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 = I
COUTPUT
/(I
CDRIVER
- 1 mA
(a)
) ≥ 10
4 Start-up voltage is the minimum power supply voltage at which the internal oscillator begins
to work.
a. Current less due to a built in 1 kΩ anti leakage resistor.
7/23
Typical performance characteristics MC34063AB - MC34063AC - MC34063EB - MC34063EC

5 Typical performance characteristics

Figure 3. Emitter follower configuration
output saturation voltage vs emitter current
Figure 5. Common emitter configuration
output switch saturation voltage vs collector current
Figure 4. Output switch ON-OFF time vs
oscillator timing capacitor
Figure 6. Darlington configuration collector
emitter saturation voltage (V
CEsat
vs temperature
)
8/23
MC34063AB - MC34063AC - MC34063EB - MC34063EC Typical performance characteristics
Figure 7. Power collector emitter saturation

Figure 9. Reference voltage vs temperature Figure 10. Bias current vs temperature

voltage (V
) vs temperature
CEsat
Figure 8. Current limit sense voltage (V
vs temperature
IPK
)

Figure 11. Supply current vs temperature Figure 12. Supply current vs input voltage

9/23
Typical application circuit MC34063AB - MC34063AC - MC34063EB - MC34063EC

6 Typical application circuit

Figure 13. Step-up converter

Figure 14. Printed evaluation board

Table 9. Test condition (V
Test Conditions Value (Typ.) Unit
Line Regulation V
Load Regulation V
Output Ripple V
Efficiency V
= 28 V)
OUT
= 8 to 16 V, IO = 175 mA 30 mV
IN
= 12 V, IO = 75 to 175 mA 10 mV
IN
= 12 V, IO = 175 mA 300 mV
IN
= 12 V, IO = 175 mA 89 %
IN
PIN 1 = V
OUT
PIN 2 = GND PIN 3 = GND PIN 4 = V
IN
10/23
MC34063AB - MC34063AC - MC34063EB - MC34063EC Typical application circuit

Figure 15. Step-down converter

Figure 16. Printed evaluation board

Table 10. Test condition (V
OUT
= 5 V)
Test Conditions Value (typ.) Unit
Line regulation V
Load regulation V
Output ripple V
Efficiency V
I
SC
= 15 to 25 V, IO = 500 mA 5 mV
IN
= 25 V, IO = 50 to 500 mA 30 mV
IN
= 25 V, IO = 500 mA 100 mV
IN
= 25 V, IO = 500 mA 80 %
IN
V
= 25 V, R
IN
PIN 1 = V PIN 2 = GND
OUT
PIN 3 = GND PIN 4 = V
= 0.1 Ω 1.2 A
LOAD
IN
11/23
Typical application circuit MC34063AB - MC34063AC - MC34063EB - MC34063EC

Figure 17. Voltage inverting converter

Figure 18. Printed evaluation board

Table 11. Test condition (V
OUT
= 12 V)
Test Conditions Value (typ.) Unit
Line regulation V
Load regulation V
Output ripple V
Efficiency V
I
SC
= 4.5 to 6 V, IO = 100 mA 15 mV
IN
= 5 V, IO = 10 to 100 mA 20 mV
IN
= 5 V, IO = 100 mA 230 mV
IN
= 5 V, IO = 100 mA 58 %
IN
V
= 5 V, R
IN
PIN 1 = V PIN 2 = GND
OUT
PIN 3 = GND PIN 4 = V
= 0.1 Ω 0.9 A
LOAD
IN
12/23
MC34063AB - MC34063AC - MC34063EB - MC34063EC Typical application circuit
--
V
U
--
V
I
I
()
I
V

Table 12. Calculation

Parameter
t
on/toff
(ton + t
C
I
PK(switch)
R
C
L
) max 1/f
off
T
SC
O
(min)
Note: V
Step-Up
(Discontinuous mode)
OUTVFVIN mi(
---------------------------------------------
V
2I
out(max)
IN min()Vsat
----------------------------------
I
PK switch()
= Saturation voltage of the output switch
SAT
V
= Forward voltage drop of the output rectifier
F
+
IN min()Vsat
min
4.5x10-5t
[(ton/t
0.3/I
PK(switch)
outton
------------------------------ -
V
ripple p p–()
×
on
)+1] 2I
off
t
on mi(
Step-Down
(Continuous mode)
+
OUTVF
------------------------------------------------
V
Nmin()Vsat
4.5x10-5t
0.3/I
PK switch()tontoff
----------------------------------------------------- -
8V
min()Vsat
---------------------------------------------- -
I
PK switch()
1/f
min
on
out(max)
PK(switch)
ripple p p–()
out
Voltage Inverting
(Discontinuous mode)
+
OUTVF
------------------------------ -
V
O
2I
out(max)
+
IN min()Vsat
×
t
on(
----------------------------------
I
PK switch()
INVsat
1/f
min
4.5x10-5t
[(ton/t
0.3/I
PK(switch)
outton
------------------------------ -
V
ripple p p–()
on
)+1]
off
×
t
on mi(
The following power supply characteristics must be chosen:
V
= Nominal input voltage
IN
V
= Desired output voltage, |V
OUT
I
= Desired output current
OUT
f
= Minimum desired output switching frequency at the selected values of VIN and I
MIN
V
= Desired peak to peak output ripple voltage. In practice, the calculated capacitor
RIPPLE
| = 1.25 (1 + R2/R1)
OUT
O
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.
13/23
Typical application circuit MC34063AB - MC34063AC - MC34063EB - MC34063EC

Figure 19. Step-up with external NPN switch

Figure 20. Step-down with external NPN switch

14/23
MC34063AB - MC34063AC - MC34063EB - MC34063EC Typical application circuit

Figure 21. Step-down with external PNP switch

Figure 22. Voltage inverting with external NPN switch

15/23
Typical application circuit MC34063AB - MC34063AC - MC34063EB - MC34063EC

Figure 23. Voltage inverting with external PNP saturated switch

Figure 24. Dual output voltage

16/23
MC34063AB - MC34063AC - MC34063EB - MC34063EC Typical application circuit

Figure 25. Higher output power, higher input voltage

17/23
Package mechanical data MC34063AB - MC34063AC - MC34063EB - MC34063EC

7 Package mechanical data

In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com
18/23
MC34063AB - MC34063AC - MC34063EB - MC34063EC Package mechanical data
Plastic DIP-8 mechanical data
Dim.
Min. Typ. Max. Min. Typ. Max.
A 3.3 0.130
a1 0.7 0.028
B1.39 1.65 0.055 0.065
B1 0.91 1.04 0.036 0.041
b 0.5 0.020
b10.38 0.5 0.015 0.020
D 9.8 0.386
E 8.8 0.346
e 2.54 0.100
e3 7.62 0.300
e4 7.62 0.300
F 7.1 0.280
I4.8 0.189
L 3.3 0.130
Z 0.44 1.6 0.017 0.063
mm. inch.
P001F
19/23
Package mechanical data MC34063AB - MC34063AC - MC34063EB - MC34063EC
SO-8 mechanical data
Dim.
A1.35 1.75 0.053 0.069
A1 0.10 0.25 0.04 0.010
A2 1.10 1.65 0.043 0.065
B0.33 0.51 0.013 0.020
C0.19 0.25 0.007 0.010
D4.80 5.00 0.189 0.197
E 3.80 4.00 0.150 0.157
e 1.27 0.050
H5.80 6.20 0.228 0.244
h 0.25 0.50 0.010 0.020
L 0.40 1.27 0.016 0.050
k 8° (max.)
ddd 0.1 0.04
Min. Typ. Max. Min. Typ. Max.
mm. inch.
20/23
0016023/C
MC34063AB - MC34063AC - MC34063EB - MC34063EC Package mechanical data
Tape & reel SO-8 mechanical data
mm. inch.
Dim.
Min. Typ. Max. Min. Typ. Max.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N60 2.362
T 22.4 0.882
Ao 8.1 8.5 0.319 0.335
Bo 5.5 5.9 0.216 0.232
Ko 2.1 2.3 0.082 0.090
Po 3.9 4.1 0.153 0.161
P7.98.1 0.311 0.319
21/23
Revision history MC34063AB - MC34063AC - MC34063EB - MC34063EC

8 Revision history

Table 13. Document revision history

Date Revision Changes
22-Jun-2004 9
20-Nov-2007 10 Added Ta b le 1 .
22/23
MC34063AB - MC34063AC - MC34063EB - MC34063EC
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