Page 1
MC34063A/MC33063A
SMPS Controller
www.fairchildsemi.com
Features
• Operation from 3.0 to 40V input
• Short circuit current limiting
• Low standby current
• Output switch current of 1.5A without external transistors
• Output voltage adjustable
• Frequency of operation from 100Hz to 100KHz
• Step up, Step down or inverting switching regulators
Description
The MC34063A/MC33063A is a monolithic regulator sub
system intended for use as DC to DC converter. This 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 regulators as well as for series pass regulators.
8-DIP
1
8-SOP
1
Internal Block Diagram
©2001 Fairchild Semiconductor Corporation
Rev. 1.0.2
Page 2
MC34063A/MC33063A
Absolute Maximum Ratings
Parameter Symbol Value Unit
Supply Voltage V
Comparator Input Voltage Range V
I(COMP)
Switch Collector Voltage V
Switch Emitter Voltage V
Switch Collector To Emitter Voltage V
CE(SW)
Driver Collector Voltage V
Switch Current I
Storage Temperature Range T
CC
C(SW)
E(SW)
C(DR)
SW
STG
40 V
- 0.3 ~ + 40 V
40 V
40 V
40 V
40 V
1.5 A
- 65 ~ + 150 °C
Electrical Characteristics
(VCC = 5.0V, TA = 0°C to +70°C for the MC34063, TA= -40°C to the +85°C for the MC33063, unless otherwise
specified)
Parameter Symbol Conditions Min. Typ. Max. Unit
OSCILLATOR
Charging Current I
Discharging Current I
Oscillator Amplitude V
CHG
DISCHG
(OSC)
Discharge To Charge Current Ratio K V
Current Limit Sense
Voltage
V
SENSE(C.L)
OUTPUT SWITCH
Saturation Voltage 1 (Note) V
Saturation Voltage 2 (Note) V
DC Current Gain (Note) G
Collector off State Current (Note) I
CE(SAT)
CE(SAT)
I(DC)
C(OFF)
COMPARATOR
Threshold Voltage V
Threshold Voltage Line Regulation ∆V
Input Bias Current I
TH
TH
BIAS
TOTAL DEVICE
Supply Current
MC34063
I
CC
MC33063 --5.0
VCC = 5 to 40V
T
= 25°C
A
VCC = 5 to 40V
T
= 25°C
A
22 31 42 µA
140 190 260 µA
TA = 25°C-0.5-V
I
TA = 25°C
I
1
V
I
2
V
ISW = 1.0A,
V
= V
7
CC , TA
= I
CHG
= 1.0A
SW
(driver) = VC(SW)
C
= 1.0A,
SW
(driver) = 50mA
C
= 5.0V, TA = 25°C
CE
= 25°C 5.2 6.1 7.5 -
DISCHG
250 300 350 mV
- 0.95 1.3 V
- 0.45 0.7 V
50 180 - -
VCE = 40V, TA = 25°C - 0.01 100 µA
- 1.21 1.24 1.29 V
VCC = 3 to 40V - 2.0 5.0 mV
VI = 0V - 50 400 nA
VCC = 5 to 40V
C
= 0.001uF
T
V
= V
7
CC, V5>VTH
--4.0
mA
pin2 = GND
Note :
Output switch tests are performed under pulsed conditions to minimize power dissipation
2
Page 3
Typical Performance Characteristics
MC34063A/MC33063A
Temperature (°C)
Figure 1. Temperature Drift (V
TH
Temperature (°C)
)
Figure 2.
Temperature Drift (IOC)
3
Page 4
MC34063A/MC33063A
Mechanical Dimensions
Package
6.40
±0.20
0.252
±0.008
8-DIP
0.79
0.031
()
±0.10
±0.004
±0.10
±0.004
#1
#8
#4 #5
7.62
0.300
MAX
9.60
0.378
5.08
0.200
3.40
0.134
±0.20
9.20
MAX
±0.20
±0.008
±0.008
0.362
0.33
0.013
MIN
0.46
3.30
0.130
2.54
±0.30
±0.012
0.018
0.100
1.524
0.060
+0.10
0.25
–0.05
+0.004
0.010
–0.002
0~15°
4
Page 5
MC34063A/MC33063A
Mechanical Dimensions
Package
#1
#4
(Continued)
8-SOP
1.55 ±0.20
0.061 ±0.008
#8
#5
MAX
5.13
0.202
4.92 ±0.20
0.194 ±0.008
MIN
0.004~0.001
0.1~0.25
0.56
0.022
()
0.006
0.15
+
-0.002
-0.05
0.004
0.50 ±0.20
0.020 ±0.008
+
0.10
6.00 ±0.30
0.236 ±0.012
3.95 ±0.20
0.156 ±0.008
5.72
0.225
0.071
0~8°
1.80
MAX
MAX0.10
MAX0.004
1.27
0.050
0.41 ±0.10
0.016 ±0.004
5
Page 6
MC34063A/MC33063A
Ordering Informatio
Product Number Package Operating Temperature
MC34063AP 8-DIP
MC34063AD 8-SOP
MC33063AP 8-DIP
MC33063AD 8-SOP
0 ~ + 70°C
-40 ~ + 85°C
6
Page 7
MC34063A/MC33063A
7
Page 8
MC34063A/MC33063A
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURT HER NOTICE TO ANY
PRODUCTS HEREI N TO IMPROVE RELIABILITY, FUNCTIO N OR DESIGN. FAIRCH IL D DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER IT S PATENT RIGHTS, NOR THE RIGHTS OF OTHE RS.
LIFE SUPPORT POL I CY
FAIRCHILD’S PR ODUCTS ARE NOT AUTH ORIZED FOR USE AS C RITICAL COMPONENT S IN LIFE SUPPORT DE VICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein :
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
2. A critical component in any component of a life support
device or sy stem whose fai lure to perform can be
reasonably expec ted to cause the failur e of the life support
device or system, or to affect its safety or effec t iv ene ss .
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
www.fairchildsemi.com
6/21/01 0.0m 001
2001 Fairchild Semiconductor Corporation
Stock#DSxxxxxxxx
Loading...