MC34063A, MC33063A,
SC34063A, SC33063A,
NCV33063A
1.5 A, Step-Up/Down/
Inverting Switching
Regulators
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.
Features
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MARKING
DIAGRAMS
8
3x063
ALYWA
G
8
1
SOIC−8
D SUFFIX
CASE 751
1
8
•
•
•
•
•
•
•
•
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
Pb−Free Packages are Available
8
1
Drive 8
Collector
S Q
I
pk
7
Sense
R
100
I
pk
Oscillator C
T
6
V
CC
Comparator
+
-
Comparator 5
Inverting
Input
(Bottom View)
This device contains 79 active transistors.
1.25 V
Reference
Regulator
4
GND
3
1
Timing
Capacitor
x
A
L, WL
Y, YY
W, WW
G or
G
Q2
Q1
2
Switch
Emitter
1
Switch
Collector
1
8
3x063V
ALYWA
G
3x063AP1
AWL
YYWWG
PDIP−8
P, P1 SUFFIX
CASE 626
1
8
33063AVP
AWL
YYWWG
1
DFN8
CASE 488AF
33063
ALYWA
G
= 3 or 4
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
Figure 1. Representative Schematic Diagram
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
©
Semiconductor Components Industries, LLC, 2010
August, 2010
−
Rev. 23
1
Publication Order Number:
MC34063A/D
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
Switch Collector
Switch
Emitter
Timing
Capacitor
GND
2
3
4
(Top View)
7
6
5
I
pk
Sense
V
CC
Comparator
Inverting
Input
Switch Emitter
Timing Capacitor
GND
EP Flag
(Top View)
Figure 2. Pin Connections
MAXIMUM RATINGS
Rating
Power Supply Voltage
Comparator Input Voltage Range
Switch Collector Voltage
Switch Emitter Voltage (V
Pin 1
= 40 V)
Switch Collector to Emitter Voltage
Driver Collector Voltage
Driver Collector Current (Note 1)
Switch Current
Power Dissipation and Thermal Characteristics
Plastic Package, P, P1 Suffix
T
A
= 25°C
Thermal Resistance
SOIC Package, D Suffix
T
A
= 25°C
Thermal Resistance
DFN Package
T
A
= 25°C
Thermal Resistance
Operating Junction Temperature
Operating Ambient Temperature Range
MC34063A, SC34063A
MC33063AV, NCV33063A
MC33063A, SC33063A
Storage Temperature Range
T
stg
P
D
R
qJA
T
J
T
A
0 to +70
−40
to +125
−40
to + 85
−65
to +150
°C
1.25
80
+150
mW
°C/W
°C
°C
P
D
R
qJA
625
160
mW
°C/W
P
D
R
qJA
1.25
115
W
°C/W
Symbol
V
CC
V
IR
V
C(switch)
V
E(switch)
V
CE(switch)
V
C(driver)
I
C(driver)
I
SW
Value
40
−0.3
to + 40
40
40
40
40
100
1.5
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
mA
A
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. Maximum package power dissipation limits must be observed.
2. This device series contains ESD protection and exceeds the following tests: Human Body Model 4000 V per MIL−STD−883, Method 3015.
Machine Model Method 400 V.
3. NCV prefix is for automotive and other applications requiring site and change control.
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Ç
Ç
Ç
Ç
Ç
Ç
Ç
Ç
ÇÇ
ÇÇ
ÇÇ
ÇÇ
ÇÇ
ÇÇ
ÇÇ
ÇÇ
Switch
Collector
1
8
Driver
Collector
Driver Collector
I
pk
Sense
V
CC
Comparator
Inverting Input
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
ELECTRICAL CHARACTERISTICS
(V
CC
= 5.0 V, T
A
= T
low
to T
high
[Note 4], unless otherwise specified.)
Characteristics
OSCILLATOR
Frequency (V
Pin 5
= 0 V, C
T
= 1.0 nF, T
A
= 25°C)
Charge Current (V
CC
= 5.0 V to 40 V, T
A
= 25°C)
Discharge Current (V
CC
= 5.0 V to 40 V, T
A
= 25°C)
Discharge to Charge Current Ratio (Pin 7 to V
CC
, T
A
= 25°C)
Current Limit Sense Voltage (I
chg
= I
dischg
, T
A
= 25°C)
OUTPUT SWITCH
(Note 5)
Saturation Voltage, Darlington Connection
( I
SW
= 1.0 A, Pins 1, 8 connected)
Saturation Voltage (Note 6)
(I
SW
= 1.0 A, R
Pin 8
= 82
W
to V
CC
, Forced
b
]
20)
DC Current Gain (I
SW
= 1.0 A, V
CE
= 5.0 V, T
A
= 25°C)
Collector Off−State Current (V
CE
= 40 V)
COMPARATOR
Threshold Voltage
T
A
= 25°C
T
A
= T
low
to T
high
Threshold Voltage Line Regulation (V
CC
= 3.0 V to 40 V)
MC33063, MC34063
MC33063V, NCV33063
Input Bias Current (V
in
= 0 V)
TOTAL DEVICE
Supply Current (V
CC
= 5.0 V to 40 V, C
T
= 1.0 nF, Pin 7 = V
CC
,
V
Pin 5
> V
th
, Pin 2 = GND, remaining pins open)
I
CC
−
−
4.0
mA
V
th
V
1.225
1.21
−
−
−
1.25
−
1.4
1.4
−20
1.275
1.29
mV
5.0
6.0
−400
nA
V
CE(sat)
V
CE(sat)
h
FE
I
C(off)
−
−
50
−
1.0
0.45
75
0.01
1.3
0.7
−
100
V
V
−
mA
f
osc
I
chg
I
dischg
I
dischg
/I
chg
V
ipk(sense)
24
24
140
5.2
250
33
35
220
6.5
300
42
42
260
7.5
350
kHz
mA
mA
−
mV
Symbol
Min
Typ
Max
Unit
Reg
line
I
IB
4. T
low
= 0°C for MC34063, SC34063;
−
40°C for MC33063, SC33063, MC33063V, NCV33063
T
high
= +70°C for MC34063, SC34063; + 85°C for MC33063, SC33063; +125°C for MC33063V, NCV33063
5. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
6. 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
ms
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:
IC output
w
10
Forced
b
of output switch :
IC driver – 7.0 mA *
* The 100
W
resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.
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3
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
18
16
14
OFF TIME (ms)
12
10
8
6
4
2
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Ct, TIMING CAPACITOR CAPACITANCE (nF)
FREQUENCY (kHz)
OFF TIME (ms)
ON TIME (ms)
V
CC
= 5.0 V, Pin 7 = V
CC
Pin 5 = GND, T
A
= 25°C
180
ON TIME (ms), FREQUENCY (kHz)
160
140
120
100
80
60
40
20
0
5.0
V OSC , OSCILLATOR VOLTAGE (V)
V
CC
= 5.0 V
Pin 7 = V
CC
Pin 2 = GND
Pins 1, 5, 8 = Open
C
T
= 1.0 nF
T
A
= 25°C
10
ms/DIV
Figure 4. Timing Capacitor Waveform
Figure 3. Oscillator Frequency
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0
0.2
0.4
0.6
0.8
1.0
1.2
I
E
, EMITTER CURRENT (A)
1.4
1.6
V
CC
= 5.0 V
Pins 1, 7, 8 = V
CC
Pins 3, 5 = GND
T
A
= 25°C
(See Note 7)
VCE(sat), SATURATION VOLTAGE (V)
VCE(sat), SATURATION VOLTAGE (V)
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
0.2
0.4
V
CC
= 5.0 V
Pin 7 = V
CC
Pins 2, 3, 5 = GND
T
A
= 25°C
(See Note 7)
Darlington Connection
Forced
b
= 20
0.6
0.8
1.0
1.2
I
C
, COLLECTOR CURRENT(A)
1.4
1.6
Figure 5. Emitter Follower Configuration Output
Saturation Voltage versus Emitter Current
VIPK(sense), CURRENT LIMIT SENSE VOLTAGE (V)
Figure 6. Common Emitter Configuration Output
Switch Saturation Voltage versus
Collector Current
3.6
3.2
I CC, SUPPLY CURRENT (mA)
400
380
360
340
320
300
280
260
240
220
200
-55
-25
0
25
50
75
T
A
, AMBIENT TEMPERATURE (°C)
100
125
V
CC
= 5.0 V
I
chg
= I
dischg
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0
0
5.0
10
15
20
25
30
V
CC
, SUPPLY VOLTAGE (V)
35
40
C
T
= 1.0 nF
Pin 7 = V
CC
Pin 2 = GND
Figure 7. Current Limit Sense Voltage
versus Temperature
Figure 8. Standby Supply Current versus
Supply Voltage
7. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
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4
200 mV/DIV
MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A
170
mH
L
8
180
S Q
R
7
I
pk
OSC
6
+
100
+
-
1
Q2
Q1
2
1N5819
C
T
3
C
T
Comp.
1.25 V
Ref
Reg
4
1.0
mH
R2
V
out
28 V/175 mA
+
330
C
O
+
100
47 k
V
out
1500
pF
R
sc
0.22
V
in
12 V
V
CC
5
R1
2.2 k
Optional Filter
Test
Line Regulation
Load Regulation
Output Ripple
Efficiency
Output Ripple With Optional Filter
Conditions
V
in
= 8.0 V to 16 V, I
O
= 175 mA
V
in
= 12 V, I
O
= 75 mA to 175 mA
V
in
= 12 V, I
O
= 175 mA
V
in
= 12 V, I
O
= 175 mA
V
in
= 12 V, I
O
= 175 mA
Results
30 mV =
±0.05%
10 mV =
±0.017%
400 mVpp
87.7%
40 mVpp
Figure 9. Step−Up Converter
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