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MC34063A / MCC33063A— SMPS Controller
June 2008
MC34063A / MC33063A
SMPS Controller
Features
Operation from 3.0 to 40V Input
Short Circuit Current Limiting
Low Standby Current
Output Switch Current of 1.5A Without External
Transistors
Adjustable Output Voltage
Frequency of Operation from 100Hz to 100KHz
Step-up, Step Down, or Inverting Switching
Regulators
Description
The MC34063A/MC33063A is a monolithic regulator
subsystem intended for a DC to DC converter. The
device contains a temperature-compensated bandgap
reference, a duty cycle control oscillator, driver, and
high-current output switch. It can be used for step-
down, step-up, or inverting switching and series pass
regulators.
8-DIP
8-SOP
Ordering Information
Part Number
MC34063AP
MC34063AD
MC33063AP
MC33063AD
Operating
Temperature Range
0 ~ +70°C
0 ~ +70°C
-40 ~ +85°C
-40 ~ +85°C
Eco Status
RoHS
RoHS
RoHS
RoHS
Package
8-DIP
8-SOP
8-DIP
8-SOP
For Fairchild’s definition of “green” Eco Status, please visit:
http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2001 Fairchild Semiconductor Corporation
MC34063A/MC33063A • Rev. 1.0.3
www.fairchildsemi.com
MC34063A / MC33063A — SMPS Controller
Block Diagram
DRIVE
SWITCH
COLLECTOR COLLECTOR
8
1.25V
REF
VTG
COMP
S
Q
Q2
1
5
COMPARATOR
INVERTING
INPUT
Q1
4
GND
I
P K
SENSE
TIMIN G
C APA CITOR
7
OSCILLATOR
R
RD
3
2
Figure 1. Block Diagram
* V
CC
(6)
© 2001 Fairchild Semiconductor Corporation
MC34063A/MC33063A • Rev. 1.0.3
www.fairchildsemi.com
2
MC34063A / MC33063A — SMPS Controller
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device
reliability. The absolute maximum ratings are stress ratings only.
Symbol
V
CC
V
I(COMP)
V
C(SW)
V
E(SW)
V
CE(SW)
V
C(DR)
I
SW
T
STG
P
D
Parameter
Supply Voltage
Comparator Input Voltage Range
Switch Collector Voltage
Switch Emitter Voltage
Switch Collector to Emitter Voltage
Driver Collector Voltage
Switch Current
Storage Temperature Range
Power Dissipation
SOP
DIP
Min.
-0.3
Max.
40
+40
40
40
40
40
1.5
Unit
V
V
V
V
V
V
A
°C
W
-65
+150
0.8
1
Electrical Characteristics
V
CC
= 5.0V, T
A
= 0°C to +70°C for MC34063, T
A
= -40°C to +85°C for MC33063, unless otherwise specified.
Symbol
Oscillator
I
CHG
I
DISCHG
V
(OSC)
K
V
SENSE(CL)
Parameter
Conditions
Min.
Typ.
Max.
Units
Charging Current
Discharging Current
Oscillator Amplitude
Discharge-to-Charge Current Ratio
Current Limit Sense Voltage
(1)
(1)
V
CC
=5 to 40V, T
A
=25°C
V
CC
=5 to 40V, T
A
=25°C
T
A
=25°C
V
7
=V
CC
, T
A
=25°C
I
CHG
=I
DISCHG
, T
A
=25°C
22
140
5.2
250
31
190
0.5
6.1
300
42
260
7.5
350
µA
µA
V
mV
Output Switch
V
CE(SAT)1
V
CE(SAT)2
G
I(DC)
I
C(OFF)
Saturation Voltage 1
Saturation Voltage 2
DC Current Gain
(1)
(1)
I
SW
=1.0A, V
C(driver)
=V
C(SW)
I
SW
=1.0A, V
C(driver)
=50mA
I
SW
=1.0A,
V
CE
=5.0V, T
A
=25°C
V
CE
=40V, T
A
=25°C
50
0.95
0.45
180
0.01
1.30
0.70
V
V
Collector Off-State Current
100.00
µA
Comparator
V
TH
ΔV
TH
I
BIAS
Threshold Voltage
Threshold Voltage Line Regulation
Input Bias Current
V
CC
=3 to 40V
V
I
=0V
1.21
1.24
2
50
1.29
5
400
V
mV
nA
Total Device
I
CC
Supply Current
MC34063
MC33063
V
CC
=5 to 40V, C
T
=0.001µF,
V
7
=V
CC
, V
5
>V
TH
, pin 2=GND
4
5
mA
Note:
1. Output switch tests are performed under pulsed conditions to minimize power dissipation.
© 2001 Fairchild Semiconductor Corporation
MC34063A/MC33063A • Rev. 1.0.3
www.fairchildsemi.com
3
MC34063A / MC33063A — SMPS Controller
Typical Performance Characteristics
Figure 2. Temperature Drift (V
TH
)
Figure 3. Temperature Drift (I
OC
)
© 2001 Fairchild Semiconductor Corporation
MC34063A/MC33063A • Rev. 1.0.3
www.fairchildsemi.com
4
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