MC34063A Datasheet PDF - ON Semiconductor

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MC34063A
ON Semiconductor

Part Number MC34063A
Description Step−Up / Down / Inverting Switching Regulators
Page 13 Pages


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MC34063A, MC33063A,
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
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
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Drive 8
Collector
Ipk 7
Sense
6
VCC
Comparator 5
Inverting
Input
S Q Q2
R
100
Q1
Ipk
Oscillator
CT
Comparator
+ 1.25 V
Reference
Regulator
1
Switch
Collector
2 Switch
Emitter
3 Timing
Capacitor
4
GND
(Bottom View)
This device contains 51 active transistors.
Figure 1. Representative Schematic Diagram
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8
1
SOIC−8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
3x063
ALYWA
G
1
8
1
PDIP−8
P, P1 SUFFIX
CASE 626
8
3x063AP1
AWL
YYWWG
1
8
33063AVP
AWL
YYWWG
1
x
A
L, WL
Y, YY
W, WW
G or G
= 3 or 4
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
Switch
Collector
Switch
Emitter
1
2
Timing 3
Capacitor
GND 4
8
Driver
Collector
7 Ipk Sense
(Top View)
6 VCC
Comparator
5 Inverting
Input
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
© Semiconductor Components Industries, LLC, 2007
February, 2007 − Rev. 19
1
Publication Order Number:
MC34063A/D



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MC34063A, MC33063A, NCV33063A
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Voltage
Comparator Input Voltage Range
Switch Collector Voltage
Switch Emitter Voltage (VPin 1 = 40 V)
Switch Collector to Emitter Voltage
Driver Collector Voltage
Driver Collector Current (Note 1)
Switch Current
Power Dissipation and Thermal Characteristics
VCC
VIR
VC(switch)
VE(switch)
VCE(switch)
VC(driver)
IC(driver)
ISW
40
−0.3 to + 40
40
40
40
40
100
1.5
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
mA
A
Plastic Package, P, P1 Suffix
TA = 25°C
Thermal Resistance
SOIC Package, D Suffix
PD
RqJA
1.25 W
100 °C/W
TA = 25°C
Thermal Resistance
Operating Junction Temperature
Operating Ambient Temperature Range
MC34063A
PD
RqJA
TJ
TA
625
160
+150
0 to +70
mW
°C/W
°C
°C
MC33063AV, NCV33063A
−40 to +125
MC33063A
−40 to + 85
Storage Temperature Range
Tstg
−65 to +150
°C
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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MC34063A, MC33063A, NCV33063A
ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, TA = Tlow to Thigh [Note 4], unless otherwise specified.)
Characteristics
Symbol
Min Typ Max Unit
OSCILLATOR
Frequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C)
Charge Current (VCC = 5.0 V to 40 V, TA = 25°C)
Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C)
Discharge to Charge Current Ratio (Pin 7 to VCC, TA = 25°C)
Current Limit Sense Voltage (Ichg = Idischg, TA = 25°C)
OUTPUT SWITCH (Note 5)
Saturation Voltage, Darlington Connection
( ISW = 1.0 A, Pins 1, 8 connected)
Saturation Voltage (Note 6)
(ISW = 1.0 A, RPin 8 = 82 W to VCC, Forced b ] 20)
DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C)
Collector Off−State Current (VCE = 40 V)
COMPARATOR
Threshold Voltage
TA = 25°C
TA = Tlow to Thigh
Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V)
MC33063A, MC34063A
MC33063AV, NCV33063A
fosc
Ichg
Idischg
Idischg/Ichg
Vipk(sense)
24 33 42
24 35 42
140 220 260
5.2 6.5 7.5
250 300 350
kHz
mA
mA
mV
VCE(sat)
VCE(sat)
hFE
IC(off)
− 1.0 1.3
− 0.45 0.7
50 75
− 0.01 100
V
V
mA
Vth
Regline
1.225 1.25 1.275
1.21 − 1.29
− 1.4 5.0
− 1.4 6.0
V
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
4. Tlow = 0°C for MC34063A, − 40°C for MC33063A, AV, NCV33063A
Thigh = +70°C for MC34063A, + 85°C for MC33063A, +125°C for MC33063AV, NCV33063A
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:
Forced b of output switch :
IC
IC output
driver – 7.0
mA
*
w
10
* 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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MC34063A, MC33063A, NCV33063A
1000
500 VCC = 5.0 V
200
Pin 7 = VCC
Pin 5 = GND
100 TA = 25°C
50
ton
20
10
5.0 toff
2.0
1.0
0.01 0.02 0.05 0.1 0.2
0.5 1.0 2.0
CT, OSCILLATOR TIMING CAPACITOR (nF)
5.0 10
Figure 2. Output Switch On−Off Time versus
Oscillator Timing Capacitor
1.8
1.7
1.6
1.5
1.4
1.3
VCC = 5.0 V
1.2 Pins 1, 7, 8 = VCC
Pins 3, 5 = GND
1.1 TA = 25°C
(See Note 7)
1.0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
IE, EMITTER CURRENT (A)
Figure 4. Emitter Follower Configuration Output
Saturation Voltage versus Emitter Current
VCC = 5.0 V
Pin 7 = VCC
Pin 2 = GND
Pins 1, 5, 8 = Open
CT = 1.0 nF
TA = 25°C
10 ms/DIV
Figure 3. Timing Capacitor Waveform
1.1
1.0
0.9 Darlington Connection
0.8
0.7
0.6 VCC = 5.0 V
0.5 Pin 7 = VCC
0.4
Pins 2, 3, 5 = GND
TA = 25°C
0.3 (See Note 7)
Forced b = 20
0.2
0.1
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
IC, COLLECTOR CURRENT(A)
Figure 5. Common Emitter Configuration Output
Switch Saturation Voltage versus
Collector Current
400
380
360
VCC = 5.0 V
Ichg = Idischg
340
320
300
280
260
240
220
200
−55
−25 0 25 50 75
TA, AMBIENT TEMPERATURE (°C)
100
Figure 6. Current Limit Sense Voltage
versus Temperature
125
3.6
3.2
2.8
2.4
2.0
1.6
1.2 CT = 1.0 nF
0.8 Pin 7 = VCC
Pin 2 = GND
0.4
0
0 5.0 10 15 20 25 30 35 40
VCC, SUPPLY VOLTAGE (V)
Figure 7. 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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