MC33063AVP
Plastic DIP
Order this document by MC34063A/D
MC34063A
MC33063A
DC–to–DC CONVERTER
CONTROL CIRCUITS
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
P, P1 SUFFIX
PLASTIC PACKAGE
CASE 626
PIN CONNECTIONS
SEMICONDUCTOR
TECHNICAL DATA
8
1
1
8
1
Switch
Collector
Switch
Emitter
Timing
Capacitor
Gnd
Driver
Collector
Ipk Sense
VCC
Comparator
Inverting
Input
(Top View)
Device
Operating
Temperature Range
Package
ORDERING INFORMATION
MC33063AD
MC33063AP1
TA = – 40
°
to +85
°
C
SO–8
Plastic DIP
MC33063AVD
TA = –40
°
to +125
°
C
SO–8
2
3
4
5
6
7
8
MC34063AD
SO–8
MC34063AP1
TA = 0
°
to +70
°
C
Plastic DIP
1
MOTOROLA ANALOG IC DEVICE DATA
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
S Q
R
Q2
Q1
100
Ipk
Oscillator CT
Comparator
+
–
1.25 V
Reference
Regulator
1
2
3
4
5
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.
©
Motorola, Inc. 1996
Rev 5
MC34063A MC33063A
2
MOTOROLA ANALOG IC DEVICE DATA
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
PD
1.25
W
Thermal Resistance
R
θ
JA
100
°
C/W
SOIC Package, D Suffix
TA = 25
°
C
PD
625
W
Thermal Resistance
R
θ
JA
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
NOTES: 1. Maximum package power dissipation limits must be observed.
2. ESD data available upon request.
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
µ
A
Discharge Current (VCC = 5.0 V to 40 V, TA = 25
°
C)
Idischg
140
220
260
µ
A
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 (Note 5)
( ISW = 1.0 A, Pins 1, 8 connected)
VCE(sat)
–
1.0
1.3
V
Saturation Voltage, Darlington Connection
(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
µ
A
NOTES: 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
µ
s 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:
*The 100
Ω
resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.
Forced
b
of output switch :
IC output
IC driver – 7.0 mA *
w
10
MC34063A MC33063A
3
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5.0 V, TA = Tlow to Thigh [Note 3], unless otherwise specified.)
Characteristics
Unit
Max
Typ
Min
Symbol
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
NOTES: 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
µ
s 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:
*The 100
Ω
resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.
Forced
b
of output switch :
IC output
IC driver – 7.0 mA *
w
10
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–of
f
µ
t
10
µ
s/DIV
, OSCILLA
T
OR
VOL
TAGE (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
MC34063A MC33063A
4
MOTOROLA ANALOG IC DEVICE DATA
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
, SA
TURA
TION VOL
TAGE
(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 4)
, SA
TURA
TION VOL
TAGE
(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 VOL
TAGE
(V)
IPK(sense)
TA, AMBIENT TEMPERATURE (
°
C)
V
VCC = 5.0 V
Ichg = Idischg
0
5.0
10
15
20
25
30
35
40
, SUPPL
Y
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 4)
NOTE:
4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
MC34063A MC33063A
5
MOTOROLA ANALOG IC DEVICE DATA
170
µ
H
L
8
180
7
Rsc
0.22
6
Vin
12 V
100
+
5
R1
2.2 k
R2
47 k
S Q
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
µ
H
+
100
Optional Filter
Figure 7. Step–Up Converter
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
8a. External NPN Switch
8b. External NPN Saturated Switch
(See Note 5)
8
7
6
Rsc
Vin
1
2
Vout
R
R
³
0 for
constant Vin
NOTE:
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
µ
s 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
6
MOTOROLA ANALOG IC DEVICE DATA
1.25 V
Ref
Reg
Vout
5.0 V/500 mA
1.0
µ
H
Vout
+
100
Optional Filter
8
7
Rsc
0.33
6
Vin
25 V
100
+
R1
1.2 k
R2
3.6 k
S Q
R
Q2
Q1
Ipk
Osc
CT
VCC
+
–
Comp.
1
2
3
4
CT
470
pF
470
CO
+
5
L
1N5819
220
µ
H
Figure 9. Step–Down Converter
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
Ω
1.1 A
Efficiency
Vin = 25 V, IO = 500 mA
83.7%
Output Ripple With Optional Filter
Vin = 25 V, IO = 500 mA
40 mVpp
10a. External NPN Switch
10b. External PNP Saturated Switch
8
7
6
Rsc
Vin
1
2
Vout
8
7
6
Rsc
Vin
1
2
Vout
Figure 10. External Current Boost Connections for IC Peak Greater than 1.5 A
MC34063A MC33063A
7
MOTOROLA ANALOG IC DEVICE DATA
1.25 V
Ref
Reg
Vout
–12 V/100 mA
Vout
1.0
µ
H
+
100
Optional Filter
8
7
Rsc
0.24
6
Vin
4.5 V to 6.0 V
100
+
5
R2
8.2 k
S Q
R
Q2
Q1
Ipk
Osc
CT
Comp.
R1
953
1
2
3
4
+
1500
pF
+
–
1N5819
1000
µ
f
+
88
µ
H
VCC
CO
L
Figure 11. Voltage Inverting Converter
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
Ω
910 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
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
8
MOTOROLA ANALOG IC DEVICE DATA
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 (
µ
H)
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
9
MOTOROLA ANALOG IC DEVICE DATA
Figure 14. Design Formula Table
Calculation
Step–Up
Step–Down
Voltage–Inverting
ton/toff
Vout
)
V
F
*
V
in(min)
V
in(min)
*
Vsat
Vout
)
V
F
V
in(min)
*
Vsat
*
Vout
|Vout|
)
V
F
V
in
*
Vsat
(ton + toff)
1
f
1
f
1
f
toff
ton
)
t
off
ton
t
off
)
1
ton
)
t
off
ton
t
off
)
1
ton
)
t
off
ton
t
off
)
1
ton
(ton + toff) – toff
(ton + toff) – toff
(ton + toff) – toff
CT
4.0 x 10–5 ton
4.0 x 10–5 ton
4.0 x 10–5 ton
Ipk(switch)
2I
out(max)
ton
t
off
)
1
2I
out(max)
2I
out(max)
ton
t
off
)
1
Rsc
0.3/Ipk(switch)
0.3/Ipk(switch)
0.3/Ipk(switch)
L(min)
(V
in(min)
*
Vsat)
I
pk(switch)
t
on(max)
(V
in(min)
*
Vsat
*
Vout)
I
pk(switch)
t
on(max)
(V
in(min)
*
Vsat)
I
pk(switch)
t
on(max)
CO
9
Ioutton
V
ripple(pp)
I
pk(switch)
(ton
)
t
off
)
8V
ripple(pp)
9
Ioutton
V
ripple(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
Vripple(pp) –
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
1
)
R2
R1
MC34063A MC33063A
10
MOTOROLA ANALOG IC DEVICE DATA
P, P1 SUFFIX
PLASTIC PACKAGE
CASE 626–05
ISSUE K
OUTLINE DIMENSIONS
D SUFFIX
PLASTIC PACKAGE
CASE 751–05
(SO–8)
ISSUE P
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
MIN
MAX
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