©2001 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.2
Features
• Operation from 3.0 to 40V inp ut
• Short circuit current limiting
• Low standby current
• Output switch current of 1.5A without external tran sistors
• 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
8-SOP
1
1
Internal Block Diagram
MC34063A/MC33063A
SMPS Controller
MC34063A/MC33063A
2
Absolute Maximum Ratings
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)
Note :
Output switch tests are performed under pulsed conditions to minimize power dissipation
Parameter Symbol Value Unit
Supply Voltage VCC 40 V
Comparator Input Voltage Range VI(COMP) - 0.3 ~ + 40 V
Switch Collector Voltage VC(SW) 40 V
Switch Emitter Voltage VE(SW) 40 V
Switch Collector To Emitter Voltage VCE(SW) 40 V
Driver Collector Voltage VC(DR) 40 V
Switch Current ISW 1.5 A
Storage Temperature Range TSTG - 65 ~ + 150 °C
Parameter Symbol Conditions Min. Typ. Max. Unit
OSCILLATOR
Charging Current ICHG VCC = 5 to 40V
TA = 25°C22 31 42 µA
Discharging Current IDISCHG VCC = 5 to 40V
TA = 25°C140 190 260 µA
Oscillator Amplitude V(OSC) TA = 25°C-0.5-V
Discharge To Charge Current Ratio K V7 = VCC , TA = 25°C 5.2 6.1 7.5 -
Current Limit Sense
Voltage VSENSE(C.L) ICHG = IDISCHG
TA = 25°C250 300 350 mV
OUTPUT SWITCH
Saturation Voltage 1 (Note) VCE(SAT)1 ISW = 1.0A
VC(driver) = VC(SW) - 0.95 1.3 V
Saturation Voltage 2 (Note) VCE(SAT)2 ISW = 1.0A,
VC(driver) = 50mA - 0.45 0.7 V
DC Current Gain (Note) GI(DC) ISW = 1.0A,
VCE = 5.0V, TA = 25°C50 180 - -
Collector off State Current (Note) IC(OFF) VCE = 40V, TA = 25°C - 0.01 100 µA
COMPARATOR
Threshold Voltage VTH - 1.21 1.24 1.29 V
Threshold Voltage Line Regulation ∆VTH VCC = 3 to 40V - 2.0 5.0 mV
Input Bias Current IBIAS VI = 0V - 50 400 nA
TOTAL DEVICE
Supply Current
MC34063 ICC
VCC = 5 to 40V
CT = 0.001uF
V7 = VCC, V5>VTH
pin2 = GND
--4.0
mA
MC33063 --5.0
MC34063A/MC33063A
3
Typical Performance Chara cte ristic s
Temperature (°C)
Figure 1. Temperature Drift (VTH)Temperature (°C)
Figure 2. Temperature Drift (IOC)
MC34063A/MC33063A
4
Mechanical Dimensions
Package
6.40
±0.20
3.30
±0.30
0.130
±0.012
3.40
±0.20
0.134
±0.008
#1
#4 #5
#8
0.252
±0.008
9.20
±0.20
0.79
2.54
0.100
0.031
()
0.46
±0.10
0.018
±0.004
0.060
±0.004
1.524
±0.10
0.362
±0.008
9.60
0.378 MAX
5.08
0.200
0.33
0.013
7.62
0~15°
0.300
MAX
MIN
0.25 +0.10
–0.05
0.010+0.004
–0.002
8-DIP
MC34063A/MC33063A
5
Mechanical Dimensions (Continued)
Package
4.92 ±0.20
0.194 ±0.008
0.41 ±0.10
0.016 ±0.004
1.27
0.050
5.72
0.225
1.55 ±0.20
0.061 ±0.008
0.1~0.25
0.004~0.001
6.00 ±0.30
0.236 ±0.012
3.95 ±0.20
0.156 ±0.008
0.50 ±0.20
0.020 ±0.008
5.13
0.202 MAX
#1
#4 #5
0~8°
#8
0.56
0.022
()
1.80
0.071
MAX0.10
MAX0.004
MAX
MIN
+0.10
-0.05
0.15+0.004
-0.002
0.006
8-SOP
MC34063A/MC33063A
6
Ordering Informatio
Product Number Package Operating Temperature
MC34063AP 8-DIP 0 ~ + 70°C
MC34063AD 8-SOP
MC33063AP 8-DIP -40 ~ + 85°C
MC33063AD 8-SOP
MC34063A/MC33063A
7
MC34063A/MC33063A
6/21/01 0.0m 001
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2001 Fairchild Semicond uctor Corporation
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user.
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reasonably expected to cause the failure of the life support
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