MC34063xx Datasheet by STMicroelectronics

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February 2020 DocID5257 Rev 12 1/23
23
MC34063AB, MC34063AC,
MC34063EB, MC34063EC
DC-DC converter control circuits
Datasheet
-
production data
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
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.
SO-8
DIP-8
Table 1. Device summary
Order codes
DIP-8 SO-8
MC34063ABN MC34063ABD-TR
MC34063ACN MC34063ACD-TR
MC34063EBN MC34063EBD-TR
MC34063ECN MC34063ECD-TR
www.st.com
Contents MC34063AB, MC34063AC, MC34063EB, MC34063EC
2/23 DocID5257 Rev 12
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
Drive Colleclor IpK Sense [7] Vcc [6] Comparator Inverfing [5 Input Comparamr Switch 1] CoHecmr \pk osciuum —[3] Timing Capacitor 1.25v Reterence Raguwam —[4] GND SCHON
DocID5257 Rev 12 3/23
MC34063AB, MC34063AC, MC34063EB, MC34063EC Diagram
1 Diagram
Figure 1. Block diagram
SWC I: SWE I: TC I: GND I: 8 :I DRC :I JFK :IVcc 5 :IC” 551K730
Pin configuration MC34063AB, MC34063AC, MC34063EB, MC34063EC
4/23 DocID5257 Rev 12
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
6 V
CC
Voltage supply
7 I
PK
I
PK
sense
8 DRC Voltage driver collector
é]
DocID5257 Rev 12 5/23
MC34063AB, MC34063AC, MC34063EB, MC34063EC Maximum ratings
3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
V
CC
Power supply voltage 50 V
V
IR
Comparator input voltage range -0.3 to 40 V
V
SWC
Switch collector voltage 40 V
V
SWE
Switch emitter voltage (V
SWC
= 40V) 40 V
V
CE
Switch collector to emitter voltage 40 V
V
DC
Driver collector voltage 40 V
I
DC
Driver collector current 100 mA
I
SW
Switch current 1.5 A
P
TOT
Power dissipation at T
A
= 25°C for DIP-8 1.25 W
for SO-8 0.625
T
J
Operating junction temperature 150 °C
T
STG
Storage temperature range -40 to 150 °C
T
OP
Operating ambient temperature
range
for AC and EC
series 0 to 70
°C
for AB series -40 to 85
for EB series -40 to 125
Table 4. Thermal data
Symbol Parameter DIP-8 SO-8 Unit
R
thJA
Thermal resistance junction-ambient
(1)
1. This value depends from thermal design of PCB on which the device is mounted.
100 160 °C/W
R
thJC
Thermal resistance junction-case 42 20 °C/W
Electrical characteristics MC34063AB, MC34063AC, MC34063EB, MC34063EC
6/23 DocID5257 Rev 12
4 Electrical characteristics
Refer to the test circuits, V
CC
= 5 V, T
A
= T
LOW
to T
HIGH
, unless otherwise specified.
(a)
a. T
LOW
= 0 °C, T
HIGH
= 70 °C (AC and EC series); T
LOW
= -40 °C, T
HIGH
= 85 °C (AB series); T
LOW
= -40 °C,
T
HIGH
= 125 °C (EB series)
Table 5. Oscillator
Symbol Parameter Test conditions Min. Typ. Max. Unit
f
OSC
Frequency V
PIN5
= 0V, C
T
= 1 nF, T
A
= 25°C 24 33 42 kHz
I
CHG
Charge current V
CC
= 5 to 40V, T
A
= 25°C 24 33 42 µA
I
DISCHG
Discharge current V
CC
= 5 to 40V, T
A
= 25°C 140 200 260 µA
I
DISCHG
/I
CHG
Discharge to charge
current ratio PIN 7 = V
CC
, T
A
= 25°C 5.2 6.2 7.5 µA
V
IPK(sense)
Current limit sense voltage I
CHG
= I
DISCHG,
T
A
= 25°C 250 300 350 mV
Table 6. Output switch
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
CE(sat)
Saturation voltage, Darlington
connection I
SW
= 1 A, PIN 1, 8 connected 1 1.3 V
V
CE(sat)
Saturation voltage I
SW
= 1 A, R
PIN8
= 82 to V
CC
Forced β ~ 20 0.45 0.7 V
h
FE
DC current gain I
SW
= 1 A,V
CE
= 5 V, T
A
= 25°C 50 120
I
C(off)
Collector off-state current V
CE
= 40 V 0.01 100 µA
Table 7. Comparator
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
TH
Threshold voltage T
A
= 25°C 1.225 1.25 1.275 V
T
A
= T
LOW
to T
HIGH
1.21 1.29
Reg
line
Threshold voltage line
regulation V
CC
= 3 to 40 V 1 10 mV
I
IB
Input bias current V
IN
= 0 V -5 -400 nA
é]
DocID5257 Rev 12 7/23
MC34063AB, MC34063AC, MC34063EB, MC34063EC Electrical characteristics
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
β
of output current switch = I
COUTPUT
/(I
CDRIVER
- 1 mA)
10
Table 8. Total device
Symbol Parameter Test conditions Min. Typ. Max. Unit
I
CC
Supply current
V
CC
= 5 to 40 V
C
T
= 1 nF
PIN 7 = V
CC
V
PIN5
>V
TH
PIN 2 = GND
Remaining pins
open
for MC34063A 2.5 4
mA
1.5 4for MC34063E
V
START-UP
Start-up voltage
(1)
T
A
= 25°C
C
T
= 1 µF, PIN 5 = 0
for MC34063A 2.1 V
for MC34063E 1.5
1. Start-up voltage is the minimum power supply voltage at which the internal oscillator begins to work.
Venn») chsn n," n," ccnwz (V) (#5) 1.75 Vcc=5V 200 1.70 FiM ,7,E=Vcc Fin55.5:GND L55 TA:’15“C ‘50 1.60 1.55 ‘0” 1.50 50 ms Ma 1: o 400 EDD I100 \z(mA) um 0.1 1 Cr(nF) VCEKsu') 6:736“ chm) mum (V) (mV) "n Darlingmn Cunnmian mun 0.5 950 0.5 9m: v.4 350 0.2 anu Famed = 20 0 75a 0 Ann 200 mm |c(mA) 7w o w 50 ‘20 n (°c)
Typical performance characteristics MC34063AB, MC34063AC, MC34063EB, MC34063EC
8/23 DocID5257 Rev 12
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 (V
CEsat
) vs.
temperature
CEsat wan.) mm. (mV) 500 550 500 A50 ma 350 ‘1wa (mV) 320 an) 300 290 csnzm McamssA Mc34063£ ‘cnei mscne 7m a 40 E0 120 TJ("c) 740 0 40 so ‘20 MW) Vm M73551 lain. scum (V) (M) L255 I0 Vcc:5V 1'26“ a CM: GND L255 5 1.250 4 L245 2 1.240 0 740 n 40 so 120 n(“c) —AD 0 40 so 120 mm) In: Ec73571 ‘2: 5mm 740 D 40 so ‘20 was) IO 20 30 w vmv)
DocID5257 Rev 12 9/23
MC34063AB, MC34063AC, MC34063EB, MC34063EC Typical performance characteristics
Figure 7. Power collector emitter saturation
voltage (V
CEsat
) vs. temperature
Figure 8. Current limit sense voltage (V
IPK
) vs.
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
17mm R W mac swc ‘ man 7 IPK SWE 2 n‘ T ,5 mm a- E 5 vcc TC 3 0.22:! VIN Cir 5 CH GND ‘ '40VQUT ”V c: 2’ MC34063A/E "W75” “NWT 1. R2 :2“; new 5m mu; @ i i . o z n u . m m u 23. OOOO
Typical application circuit MC34063AB, MC34063AC, MC34063EB, MC34063EC
10/23 DocID5257 Rev 12
6 Typical application circuit
Figure 13. Step-up converter
Figure 14. Printed evaluation board
PIN 1 = V
OUT
PIN 2 = GND
PIN 3 = GND
PIN 4 = V
IN
Table 9. Test condition (V
OUT
= 28 V)
Test Conditions Value (Typ.) Unit
Line Regulation V
IN
= 8 to 16 V, I
O
= 175 mA 30 mV
Load Regulation V
IN
= 12 V, I
O
= 75 to 175 mA 10 mV
Output Ripple V
IN
= 12 V, I
O
= 175 mA 300 mV
Efficiency V
IN
= 12 V, I
O
= 175 mA 89 %
DRC swc ‘ 2 WM: R“ IPK SWE H1 ugsn D‘ van TC 3 , L Vwoi 7c” GND 2qu “V c. 2‘ MC34063A/E C: WWI I7UDF a a, {—1 0 V cm 1.2m 3.5m fig 5v/n.§A Am; scum
DocID5257 Rev 12 11/23
MC34063AB, MC34063AC, MC34063EB, MC34063EC Typical application circuit
Figure 15. Step-down converter
Figure 16. Printed evaluation board
PIN 1 = V
OUT
PIN 2 = GND
PIN 3 = GND
PIN 4 = V
IN
Table 10. Test condition (V
OUT
= 5 V)
Test Conditions Value (typ.) Unit
Line regulation V
IN
= 15 to 25 V, I
O
= 500 mA 5 mV
Load regulation V
IN
= 25 V, I
O
= 50 to 500 mA 30 mV
Output ripple V
IN
= 25 V, I
O
= 500 mA 100 mV
Efficiency V
IN
= 25 V, I
O
= 500 mA 80 %
I
SC
V
IN
= 25 V, R
LOAD
= 0.1 1.2 A
A DRC swc ‘ u 7 \ SWE 1 R 7 PK “:4 m 5 vcc TC 3 k D‘ VIN 07 icww GND ‘ 1‘ WM“ "5 ’° W a: =1 MDSAOGSA/E =1 WWI 1,5nr a, a, T 0 V OUT 3.2m 95m __ 5‘ sz/mumA ’Zwuaur scum: OUT
Typical application circuit MC34063AB, MC34063AC, MC34063EB, MC34063EC
12/23 DocID5257 Rev 12
Figure 17. Voltage inverting converter
Figure 18. Printed evaluation board
PIN 1 = V
OUT
PIN 2 = GND
PIN 3 = GND
PIN 4 = V
IN
Table 11. Test condition (V
OUT
= 12 V)
Test Conditions Value (typ.) Unit
Line regulation V
IN
= 4.5 to 6 V, I
O
= 100 mA 15 mV
Load regulation V
IN
= 5 V, I
O
= 10 to 100 mA 20 mV
Output ripple V
IN
= 5 V, I
O
= 100 mA 230 mV
Efficiency V
IN
= 5 V, I
O
= 100 mA 58 %
I
SC
V
IN
= 5 V, R
LOAD
= 0.1 0.9 A
é]
DocID5257 Rev 12 13/23
MC34063AB, MC34063AC, MC34063EB, MC34063EC Typical application circuit
Note: V
SAT
= Saturation voltage of the output switch
V
F
= Forward voltage drop of the output rectifier
The following power supply characteristics must be chosen:
V
IN
= Nominal input voltage
V
OUT
= Desired output voltage, |V
OUT
| = 1.25 (1 + R
2
/R
1
)
I
OUT
= Desired output current
f
MIN
= Minimum desired output switching frequency at the selected values of V
IN
and I
O
V
RIPPLE
= 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.
Table 12. Calculation
Parameter Step-Up
(Discontinuous mode)
Step-Down
(Continuous mode)
Voltage Inverting
(Discontinuous mode)
t
on
/t
off
(t
on
+ t
off
) max 1/f
min
1/f
min
1/f
min
C
T
4.5x10
-5
t
on
4.5x10
-5
t
on
4.5x10
-5
t
on
I
PK(switch)
2I
out(max)
[(t
on
/t
off
)+1] 2I
out(max)
2I
out(max)
[(t
on
/t
off
)+1]
R
SC
0.3/I
PK(switch)
0.3/I
PK(switch)
0.3/I
PK(switch)
C
O
L
(min)
V
OUT
V
F
V
IN min( )
+
V
IN min( )
V
sat
-------------------------------------------------------
V
OUT
V
F
+
V
IN min( )
V
sat
V
OUT
-----------------------------------------------------------
V
OUT
V
F
+
V
IN
V
sat
-------------------------------
I
out
t
on
V
ripple p p( )
-------------------------------
I
PK switch( )
t
on
t
off
+( )
8V
ripple p p( )
------------------------------------------------------
I
out
t
on
V
ripple p p( )
-------------------------------
V
IN min( )
V
sat
I
PK switch( )
-------------------------------------- t
on min( )
×
V
IN min( )
V
sat
V
out
I
PK switch( )
-------------------------------------------------------- t
on min( )
×
V
IN min( )
V
sat
I
PK switch( )
-------------------------------------- t
on min( )
×
V our semi: scum:
Typical application circuit MC34063AB, MC34063AC, MC34063EB, MC34063EC
14/23 DocID5257 Rev 12
Figure 19. Step-up with external NPN switch
Figure 20. Step-down with external NPN switch
him": Rtuumv x‘nfiz lulu“- mm." scmiz 40 VeuT
DocID5257 Rev 12 15/23
MC34063AB, MC34063AC, MC34063EB, MC34063EC Typical application circuit
Figure 21. Step-down with external PNP switch
Figure 22. Voltage inverting with external NPN switch
40 VouT scum +t2v 40 GND 712v scum
Typical application circuit MC34063AB, MC34063AC, MC34063EB, MC34063EC
16/23 DocID5257 Rev 12
Figure 23. Voltage inverting with external PNP saturated switch
Figure 24. Dual output voltage
*Vuuv unified «mm inpul .; L I
DocID5257 Rev 12 17/23
MC34063AB, MC34063AC, MC34063EB, MC34063EC Typical application circuit
Figure 25. Higher output power, higher input voltage
Package mechanical data MC34063AB, MC34063AC, MC34063EB, MC34063EC
18/23 DocID5257 Rev 12
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.
VII—VHF! LILILILI E]
DocID5257 Rev 12 19/23
MC34063AB, MC34063AC, MC34063EB, MC34063EC Package mechanical data
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A 3.3 0.130
a1 0.7 0.028
B 1.39 1.65 0.055 0.065
B1 0.91 1.04 0.036 0.041
b 0.5 0.020
b1 0.38 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
I 4.8 0.189
L 3.3 0.130
Z 0.44 1.6 0.017 0.063
Plastic DIP-8 mechanical data
P001F
SEAN; PLANE CAGE MAME
Package mechanical data MC34063AB, MC34063AC, MC34063EB, MC34063EC
20/23 DocID5257 Rev 12
Dim. mm. inch.
Min. Typ. Max. Min. Typ. Max.
A 1.35 1.75 0.053 0.069
A1 0.10 0.25 0.04 0.010
A2 1.10 1.65 0.043 0.065
B 0.33 0.51 0.013 0.020
C 0.19 0.25 0.007 0.010
D 4.80 5.00 0.189 0.197
E 3.80 4.00 0.150 0.157
e 1.27 0.050
H 5.80 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
SO-8 mechanical data
0016023/C
KOL new \fl W I; x \ Note Drawmg not m scale é]
DocID5257 Rev 12 21/23
MC34063AB, MC34063AC, MC34063EB, MC34063EC Package mechanical data
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N 60 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
P 7.9 8.1 0.311 0.319
Tape & reel SO-8 mechanical data
Revision history MC34063AB, MC34063AC, MC34063EB, MC34063EC
22/23 DocID5257 Rev 12
8 Revision history
Table 13. Document revision history
Date Revision Changes
20-Nov-2007 10 Added Table 1.
24-Apr-2013 11 Removed note in Table 1.
11-Feb-2020 12 Corrected a typo on Reg
line
parameter (from 5 mV Max. to 10 mV
Max.) in Table 7: Comparator.
é]
DocID5257 Rev 12 23/23
MC34063AB, MC34063AC, MC34063EB, MC34063EC
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