Fairchild Semiconductor MC34063A, MC33063A Datasheet
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
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
Typical Performance Characteristics
MC34063A/MC33063A
Temperature (°C)
Figure 1. Temperature Drift (V
TH
Temperature (°C)
)
Figure 2.
Temperature Drift (IOC)
3
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