Semiconductor Components Industries, LLC, 2000
August, 2000 – Rev. 6 1Publication Order Number:
MC34063A/D
MC34063A, MC33063A
DC-to-DC Converter
Control Circuits
The MC34063A Series is a monolithic control circuit containing the
primary functions required for DC–to–DC converters. These devices
consist of an internal temperature compensated reference, comparator,
controlled duty cycle oscillator with an active current limit circuit,
driver and high current output switch. This series was specifically
designed to be incorporated in Step–Down and Step–Up and
Voltage–Inverting applications with a minimum number of external
components. Refer to Application Notes AN920A/D and AN954/D
for additional design information.
•Operation from 3.0 V to 40 V Input
•Low Standby Current
•Current Limiting
•Output Switch Current to 1.5 A
•Output Voltage Adjustable
•Frequency Operation to 100 kHz
•Precision 2% Reference
Representative Schematic Diagram
SQ
R
Q2
Q1
100
Ipk
Oscillator CT
Comparator
+
-
1.25 V
Reference
Regulator
1
2
3
45
6
7
8
Drive
Collector
Ipk
Sense
VCC
Comparator
Inverting
Input
Switch
Collector
Switch
Emitter
Timing
Capacitor
Gnd
(Bottom View)
This device contains 51 active transistors.
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SO–8
D SUFFIX
CASE 751
PDIP–8
P, P1 SUFFIX
CASE 626
1
8
1
8
1
8SOEIAJ–8
M SUFFIX
CASE 968
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
ORDERING INFORMATION
See general marking information in the device marking
section on page 11 of this data sheet.
DEVICE MARKING INFORMATION
1
Switch
Collector
Switch
Emitter
Timing
Capacitor
Gnd
Driver
Collector
Ipk Sense
VCC
Comparator
Inverting
Input
(Top View)
2
3
45
6
7
8
PIN CONNECTIONS
MC34063A, MC33063A
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2
MAXIMUM RATINGS
Rating Symbol Value Unit
Power Supply Voltage VCC 40 Vdc
Comparator Input Voltage Range VIR –0.3 to +40 Vdc
Switch Collector Voltage VC(switch) 40 Vdc
Switch Emitter Voltage (VPin 1 = 40 V) VE(switch) 40 Vdc
Switch Collector to Emitter Voltage VCE(switch) 40 Vdc
Driver Collector Voltage VC(driver) 40 Vdc
Driver Collector Current (Note 1.) IC(driver) 100 mA
Switch Current ISW 1.5 A
Power Dissipation and Thermal Characteristics
Plastic Package, P, P1 Suffix
TA = 25°C PD1.25 W
Thermal Resistance RθJA 100 °C/W
SOIC Package, D Suffix
TA = 25°C PD625 W
Thermal Resistance RθJA 160 °C/W
Operating Junction Temperature TJ+150 °C
Operating Ambient Temperature Range TA°C
MC34063A 0 to +70
MC33063AV –40 to +125
MC33063A –40 to +85
Storage Temperature Range Tstg –65 to +150 °C
1. Maximum package power dissipation limits must be observed.
2. ESD data available upon request.
MC34063A, MC33063A
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3
ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, TA = Tlow to Thigh [Note 3.], unless otherwise specified.)
Characteristics Symbol Min Typ Max Unit
OSCILLATOR
Frequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C) fosc 24 33 42 kHz
Charge Current (VCC = 5.0 V to 40 V, TA = 25°C) Ichg 24 35 42 µA
Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C) Idischg 140 220 260 µA
Discharge to Charge Current Ratio (Pin 7 to VCC, TA = 25°C) Idischg/Ichg 5.2 6.5 7.5 –
Current Limit Sense Voltage (Ichg = Idischg, TA = 25°C) Vipk(sense) 250 300 350 mV
OUTPUT SWITCH (Note 4.)
Saturation Voltage, Darlington Connection
(ISW = 1.0 A, Pins 1, 8 connected) VCE(sat) – 1.0 1.3 V
Saturation Voltage (Note 5.)
(ISW = 1.0 A, RPin 8 = 82 Ω to VCC, Forced β 20) VCE(sat) – 0.45 0.7 V
DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C) hFE 50 75 – –
Collector Off–State Current (VCE = 40 V) IC(off) – 0.01 100 µA
COMPARATOR
Threshold Voltage
TA = 25°C
TA = Tlow to Thigh
Vth 1.225
1.21 1.25
–1.275
1.29
V
Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V)
MC33063A, MC34063A
MC33363AV
Regline –
–1.4
1.4 5.0
6.0
mV
Input Bias Current (Vin = 0 V) IIB ––20 –400 nA
TOTAL DEVICE
Supply Current (VCC = 5.0 V to 40 V, CT = 1.0 nF, Pin 7 = VCC,
VPin 5 > Vth, Pin 2 = Gnd, remaining pins open) ICC – – 4.0 mA
3. Tlow = 0°C for MC34063A, –40°C for MC33063A, AV Thigh = +70°C for MC34063A, +85°C for MC33063A, +125°C for MC33063AV
4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
5. If the output switch is driven into hard saturation (non–Darlington configuration) at low switch currents (≤ 300 mA) and high driver currents
(≥30 mA), it may take up to 2.0 µs for it to come out of saturation. This condition will shorten the off time at frequencies ≥ 30 kHz, and is
magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a
non–Darlington configuration is used, the following output drive condition is recommended:
Forced of output switch : ICoutput
ICdriver – 7.0 mA * 10
*The 100 Ω resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.
MC34063A, MC33063A
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4
ton
VCC = 5.0 V
Pin 7 = VCC
Pin 5 = Gnd
TA = 25°C
toff
Figure 1. Output Switch On–Off Time versus
Oscillator Timing Capacitor Figure 2. Timing Capacitor Waveform
0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10
CT, OSCILLATOR TIMING CAPACITOR (nF)
, OUTPUT SWITCH ONOFF TIME ( s)
on-off µ
t
10 µs/DIV
, OSCILLATOR VOLTAGE (V)
OSC
200 mV/DIV
V
VCC = 5.0 V
Pin 7 = VCC
Pin 2 = Gnd
Pins 1, 5, 8 = Open
CT = 1.0 nF
TA = 25°C
1000
500
200
100
50
20
10
5.0
2.0
1.0
Figure 3. Emitter Follower Configuration Output
Saturation Voltage versus Emitter Current Figure 4. Common Emitter Configuration Output
Switch Saturation Voltage versus
Collector Current
Figure 5. Current Limit Sense Voltage
versus Temperature Figure 6. Standby Supply Current versus
Supply Voltage
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
, SATURATION VOLTAGE (V)
CE(sat)
IE, EMITTER CURRENT (A)
V
VCC = 5.0 V
Pins 1, 7, 8 = VCC
Pins 3, 5 = Gnd
TA = 25°C
(See Note 6.)
, SATURATION VOLTAGE (V)
CE(sat)
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
IC, COLLECTOR CURRENT(A)
V
Darlington Connection
Forced β = 20
-55 -25 0 25 50 75 100 125
, CURRENT LIMIT SENSE VOLTAGE (V)
IPK(sense)
TA, AMBIENT TEMPERATURE (°C)
V
VCC = 5.0 V
Ichg = Idischg
0 5.0 10 15 20 25 30 35 40
, SUPPLY CURRENT (mA)
CC
VCC, SUPPLY VOLTAGE (V)
I
CT = 1.0 nF
Pin 7 = VCC
Pin 2 = Gnd
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
1.1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
400
380
360
340
320
300
280
260
240
220
200
3.6
3.2
2.4
2.0
1.6
1.2
0.8
0.4
0
1.0
2.8
VCC = 5.0 V
Pin 7 = VCC
Pins 2, 3, 5 = Gnd
TA = 25°C
(See Note 6.)
6. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
MC34063A, MC33063A
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5
170 µH
L
8
180
7
Rsc
0.22
6
Vin
12 V
100
+
5
R1 2.2 k
R2
47 k
SQ
R
Q2
Q1
Ipk
Osc
CT
VCC
+
-Comp.
1.25 V
Ref
Reg
1
2
3
4
1N5819
CT
1500
pF
330 CO
+
Vout
28 V/175 mA Vout
1.0 µH
+100
Optional Filter
Test Conditions Results
Line Regulation Vin = 8.0 V to 16 V, IO = 175 mA 30 mV = ±0.05%
Load Regulation Vin = 12 V, IO = 75 mA to 175 mA 10 mV = ±0.017%
Output Ripple Vin = 12 V, IO = 175 mA 400 mVpp
Efficiency Vin = 12 V, IO = 175 mA 87.7%
Output Ripple With Optional Filter Vin = 12 V, IO = 175 mA 40 mVpp
Figure 7. Step–Up Converter
MC34063A, MC33063A
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6
8a. External NPN Switch 8b. External NPN Saturated Switch
(See Note 7.)
8
7
6
Rsc
Vin
1
2
Vout R
R 0 for
constant Vin
7. If the output switch is driven into hard saturation (non–Darlington configuration) at low switch currents (≤ 300 mA) and high driver currents
(≥30 mA), it may take up to 2.0 µs to come out of saturation. This condition will shorten the off time at frequencies ≥ 30 kHz, and is magnified
at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a
non–Darlington configuration is used, the following output drive condition is recommended.
8
7
6
Rsc
Vin
1
2
Vout
Figure 8. External Current Boost Connections for IC Peak Greater than 1.5 A
MC34063A, MC33063A
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7
1.25 V
Ref
Reg
Vout
5.0 V/500 mA
1.0 µH
Vout
+100
Optional Filter
8
7
Rsc
0.33
6
Vin
25 V
100 +
R1 1.2 k
R2
3.6 k
SQ
R
Q2
Q1
Ipk
Osc CT
VCC
+
-Comp.
1
2
3
4
CT
470
pF
470 CO
+
5
L
1N5819
220 µH
Test Conditions Results
Line Regulation Vin = 15 V to 25 V, IO = 500 mA 12 mV = ±0.12%
Load Regulation Vin = 25 V, IO = 50 mA to 500 mA 3.0 mV = ±0.03%
Output Ripple Vin = 25 V, IO = 500 mA 120 mVpp
Short Circuit Current Vin = 25 V, RL = 0.1 Ω1.1 A
Efficiency Vin = 25 V, IO = 500 mA 83.7%
Output Ripple With Optional Filter Vin = 25 V, IO = 500 mA 40 mVpp
Figure 9. Step–Down Converter
10a. External NPN Switch 10b. External PNP Saturated Switch
8
7
6
Rsc
Vin
1
2
Vout
8
7
6
Rsc
Vin
1
2
V
Figure 10. External Current Boost Connections for IC Peak Greater than 1.5 A
MC34063A, MC33063A
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8
1.25 V
Ref
Reg
Vout
-12 V/100 mA Vout
1.0 µH
+100
Optional Filter
8
7
Rsc
0.24
6
Vin
4.5 V to 6.0 V
100
+
5
R2 8.2 k
SQ
R
Q2
Q1
Ipk
Osc CT
Comp.
R1
953
1
2
3
4
+1500
pF
+
-
1N5819
1000 µf+
88 µH
VCC
CO
L
Test Conditions Results
Line Regulation Vin = 4.5 V to 6.0 V, IO = 100 mA 3.0 mV = ±0.012%
Load Regulation Vin = 5.0 V, IO = 10 mA to 100 mA 0.022 V = ±0.09%
Output Ripple Vin = 5.0 V, IO = 100 mA 500 mVpp
Short Circuit Current Vin = 5.0 V, RL = 0.1 Ω910 mA
Efficiency Vin = 5.0 V, IO = 100 mA 62.2%
Output Ripple With Optional Filter Vin = 5.0 V, IO = 100 mA 70 mVpp
Figure 11. Voltage Inverting Converter
12a. External NPN Switch 12b. External PNP Saturated Switch
8
7
6
Vin
1
2
Vout
8
7
6
Vin
1
2
Vout
Figure 12. External Current Boost Connections for IC Peak Greater than 1.5 A
MC34063A, MC33063A
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9
5.45′′
2.500′′
(Top view, copper foil as seen through the board from the component side)
(Top View, Component Side) *Optional Filter.
Figure 13. Printed Circuit Board and Component Layout
(Circuits of Figures 7, 9, 11)
MC34063A MC34063A MC34063A
INDUCTOR DATA
Converter Inductance (µH) Turns/Wire
Step–Up 170 38 Turns of #22 AWG
Step–Down 220 48 Turns of #22 AWG
Voltage–Inverting 88 28 Turns of #22 AWG
All inductors are wound on Magnetics Inc. 55117 toroidal core.
MC34063A, MC33063A
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10
Calculation Step–Up Step–Down Voltage–Inverting
ton/toff Vout VFVin(min)
Vin(min) Vsat
Vout VF
Vin(min) Vsat Vout
|Vout|VF
Vin Vsat
(ton + toff)1
f1
f1
f
toff ton toff
ton
toff 1
ton toff
ton
toff 1
ton toff
ton
toff 1
ton (ton + toff) – toff (ton + toff) – toff (ton + toff) – toff
CT4.0 x 10–5 ton 4.0 x 10–5 ton 4.0 x 10–5 ton
Ipk(switch) 2Iout(max) ton
toff 12Iout(max) 2Iout(max) ton
toff 1
Rsc 0.3/Ipk(switch) 0.3/Ipk(switch) 0.3/Ipk(switch)
L(min) (Vin(min) Vsat)
Ipk(switch) ton(max) (Vin(min) Vsat Vout)
Ipk(switch) ton(max
)
(Vin(min) Vsat)
Ipk(switch) ton(max)
CO9Ioutton
Vripple(pp)
Ipk(switch)(ton toff)
8Vripple(pp) 9Ioutton
Vripple(pp)
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,
Iout – Desired output current.
fmin – Minimum desired output switching frequency at the selected values of Vin and IO.
Vripple(pp) – Desired peak–to–peak output ripple voltage. In practice, the calculated capacitor value will need 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.
NOTE: For further information refer to Application Note AN920A/D and AN954/D.
|Vout|1.25 1R2
R1
Figure 14. Design Formula Table
MC34063A, MC33063A
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11
ORDERING INFORMATION
Device Package Shipping
MC33063AD SO–8 98 Units / Rail
MC33063ADR2 SO–8 2500 Units / Tape & Reel
MC33063AP1 DIP–8 50 Units / Rail
MC33063AVD SO–8 98 Units / Rail
MC33063AVDR2 SO–8 2500 Units / Tape & Reel
MC33063AVP DIP–8 50 Units / Rail
MC34063AD SO–8 98 Units / Rail
MC34063ADR2 SO–8 2500 Units / Tape & Reel
MC34063AP1 DIP–8 50 Units / Rail
MC34063BD SO–8 98 Units / Rail
MC34063BDR2 SO–8 2500 Units / Tape & Reel
MC34063AM SOEIAJ–8 94 Units / Rail
MC34063AMEL SOEIAJ–8 1000 Units / Tape & Reel
MC34063AML1 SOEIAJ–8 1000 Units / Tape & Reel
MC34063AML2 SOEIAJ–8 2000 Units / Tape & Reel
MC34063AMR1 SOEIAJ–8 1000 Units / Tape & Reel
MC34063AMR2 SOEIAJ–8 2000 Units / Tape & Reel
MARKING DIAGRAMS
1
8
1
8
ALYW
M063A
1
8
PDIP–8
P, P1 SUFFIX
CASE 626
SO–8
D SUFFIX
CASE 751
SOEIAJ–8
M SUFFIX
CASE 968
x = 3 or 4
z = A denotes AD suffix
J denotes BD suffix
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
ALYWz
34063
1
8
PDIP–8
P, P1 SUFFIX
CASE 626
AWL
33063AVP
1
8
SO–8
D SUFFIX
CASE 751
YYWW
AWL
3x063AP1
YYWW ALYWz
3x063
MC34063A, MC33063A
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12
PACKAGE DIMENSIONS
SEATING
PLANE
1
4
58
A0.25 MCB SS
0.25 MBM
h
C
X 45
L
DIM MIN MAX
MILLIMETERS
A1.35 1.75
A1 0.10 0.25
B0.35 0.49
C0.19 0.25
D4.80 5.00
E
1.27 BSCe
3.80 4.00
H5.80 6.20
h
0 7
L0.40 1.25
0.25 0.50
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
2. DIMENSIONS ARE IN MILLIMETER.
3. DIMENSION D AND E DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS
OF THE B DIMENSION AT MAXIMUM MATERIAL
CONDITION.
D
EH
A
Be
B
A1
CA
0.10
PDIP–8
P, P1 SUFFIX
PLASTIC PACKAGE
CASE 626–05
ISSUE K
SO–8
D SUFFIX
PLASTIC PACKAGE
CASE 751–06
ISSUE T
NOTES:
1. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
2. PACKAGE CONTOUR OPTIONAL (ROUND OR
SQUARE CORNERS).
3. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
MIN MINMAX MAX
MILLIMETERS INCHES
DIM
9.40
6.10
3.94
0.38
1.02
0.76
0.20
2.92
0.76
10.16
6.60
4.45
0.51
1.78
1.27
0.30
3.43
0.370
0.240
0.155
0.015
0.040
0.030
0.008
0.115
0.030
0.400
0.260
0.175
0.020
0.070
0.050
0.012
0.135
10°
1.01
2.54 BSC
7.62 BSC
0.100 BSC
0.300 BSC
A
B
C
D
F
G
H
J
K
L
M
N
10°
0.040
F
HG
D
N
C
KM
J
L
NOTE 2
14
58
T
0.13 (0.005) AB
M M M
–A–
–B–
–T–
SEATING
PLANE
MC34063A, MC33063A
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13
e
0.10 (0.004)
DIM
A
MIN MAX MIN MAX
INCHES
--- 2.05 --- 0.081
MILLIMETERS
A0.05 0.20 0.002 0.008
b0.35 0.50 0.014 0.020
c0.18 0.27 0.007 0.011
D5.10 5.50 0.201 0.217
E5.10 5.45 0.201 0.215
e1.27 BSC 0.050 BSC
H7.40 8.20 0.291 0.323
L0.50 0.85 0.020 0.033
L1.10 1.50 0.043 0.059
M0 10 0 10
Q0.70 0.90 0.028 0.035
Z--- 0.94 --- 0.037
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER
3. DIMENSION D AND E DO NOT INCLUDE MOLD
FLASH OR PROTRUSIONS AND ARE MEASURED AT
THE PARTING LINE. MOLD FLASH OR
PROTRUSIONS SHALL NOT EXCEED 0.15 (0.006)
PER SIDE.
4. TERMINAL NUMBERS ARE SHOWN FOR
REFERENCE ONLY.
5. THE LEAD WIDTH DIMENSION (b) DOES NOT
INCLUDE DAMBAR PROTUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.08 (0.003)
TOTAL IN EXCESS OF THE LEAD WIDTH
DIMENSION AT MAXIMUM MATERIAL CONDITION.
DAMBAR CANNOT BE LOCATED ON THE LOWER
RADIUS OR THE FOOT MINIMUM SPACE BETWEEN
PROTRUSIONS AND ADJACENT LEAD TO BE 0.46
(0.018).
1
E
E
1
°°°°
Z
D
EHE
14
58
b
0.13 (0.005) M
A1A
c
M°
LE
L
Q1
DETAIL P
P
SOEIAJ–8
M SUFFIX
PLASTIC PACKAGE
CASE 968–01
ISSUE O
MC34063A, MC33063A
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14
Notes
MC34063A, MC33063A
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15
Notes
MC34063A, MC33063A
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16
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MC34063A/D
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