The MC34063A/E series is a monolithic control
circuit delivering the main functions for DC/DC
voltage converting.
The device contains an internal temperature
compensated reference, comparator, duty cycle
controlled oscillator with an active current limit
circuit, driver and high current output switch.
Output v oltage is adjustable through two external
resistors with a 2% reference accuracy.
Employinga minimumnumberof ex ternal
components the MC34063A /E de vice s series is
designedforStep-Down,Step-Upand
Voltage-Inverting applications.
BLOCK DIAGRAM
DIP-8SO-8
1/16March 2004
MC34063A/E
ABSOLUTE MAXIMUM RATINGS
SymbolParameterValueUnit
V
V
V
SWC
V
SWE
V
V
I
DC
I
SW
P
TOT
T
T
STG
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
Power Supply Voltage
CC
Comparator Input Voltage Range
IR
Switch Collector Voltage
Switch Emitter Voltage (V
Switch Collector to Emitter Voltage
CE
Driver Collector Voltage
DC
SWC
=40V)
Driver Collector Current
Switch Current
Power Dissipation at TA= 25°Cfor DIP-81.25
for SO-80.625
Operating Junction Temperature
J
Storage Temperature Range
Operating Ambient Temperature Range for AC and EC SERIES0 to 70
OP
for EB SERIES-40 to 125
50V
-0.3 to 40V
40V
40V
40V
40V
100mA
1.5A
W
150°C
-40 to 150°C
°Cfor AB SERIES-40 to 85
THERMAL DATA
SymbolParameterDIP-8SO-8Unit
R
thj-amb
R
thj-case
(*) This value depends from thermal design of PCB on which the device is mounted.
(*) The "A" version is not recommended for new designs.
MC34063A/E
ELECTRICAL CHARACTERISTICS (Refer to the t es t circuits, VCC=5V,TA=T
LOW
to T
HIGH
, unless
otherwise specified, see note 2)
OSCILLATOR
SymbolParameterTest ConditionsMin.Typ.Max.Unit
f
OSC
I
CHG
I
DISCHG
I
DISCHG
I
CHG
V
IPK(sense)
FrequencyV
=0V CT=1nFTA=25°C243342KHz
PIN5
Charge CurrentVCC= 5 to 40VTA=25°C243342µA
Discharge CurrentVCC= 5 to 40VTA= 25°C140200260µA
/
Discharge to Charge Current
Ratio
Current Limit Sense VoltageI
PIN 7 = V
CHG=IDISCHG
CC
TA= 25°C5.26.27.5µA
TA= 25°C250300350mV
OUTPUT S WITCH
SymbolParameterTest ConditionsMin.Typ.Max.Unit
V
CE(sat)
V
CE(sat)
Saturation Voltage, Darlington
ISW= 1 APIN 7, 8 connected11.3V
Connection
Saturation VoltageISW=1AR
=82Ω to V
PIN8
CC
0.450.7V
Forced β ~20
h
I
C(off)
DC Current GainISW=1AVCE=5VTA= 25°C50120
FE
Collector Off-State CurrentVCE=40V0.01100µA
COMPARATOR
SymbolParameterTest ConditionsMin.Typ.Max.Unit
V
Reg
I
Threshold VoltageTA= 25°C1.2251.251.275V
TH
T
A=TLOW
Threshold Voltage Line
line
Regulation
Input Bias CurrentVIN= 0 V-5-400nA
IB
VCC=3to40V15mV
to T
HIGH
1.211.29
3/16
MC34063A/E
TOTAL DEVICE
SymbolParameterTest ConditionsMin.Typ.Max.Unit
I
V
START-UP
NOTES:
1) Maximum package power dissipation limit must beobserved.
2) T
LOW
3) If Darlington configuration is not used, care must be taken to avoid deep saturation of output switch. The resulting switch-off time may be
adversely affected. In a Darlington configuration the following output driver condition is suggested:
Forced
* Current lessdue to a built in 1KΩ anti leakage resistor.
4) Start-up Voltage is the minimum PowerSupply Voltag e at which the internal oscillator b egins to work.
TYPICAL P E RFORMAN CE CHARACTE RISTICS
Supply CurrentVCC=5to40V
CC
Start-Up Voltage (Note 4)TA=25°C
=0°C,T
β of output current switch = I
= 70°C (AC and EC series); T
HIGH
COUTPUT
/(I
CDRIVER
C
=1nF
T
PIN 7 = V
V
PIN5>VTH
CC
PIN 2 = GND
Remaining pins open
C
=1µF,PIN5=0
T
=-40°C,T
LOW
-1mA*)≥ 10
= 85°C (AB series); T
HIGH
for MC34063A2.54mA
1.54for MC34063E
for MC34063A2.1V
for MC34063E1.5
LOW
= -40°C, T
= 125°C (EB series).
HIGH
Figure1 : Emitter Follower Configuration Output
Saturation Voltage vs Emitter Current
Figure2 : Output SwitchON-OFF Time vs
Oscillator Timing Capacitor
Figure3 : Common Emitter Configuration Output
Switch Saturation Voltage vs Collector Current
Figure4 : Darlington Configuration Collector
Emitter Saturation Voltage (V
CEsat)
vs Temperat.
4/16
MC34063A/E
Figure5 : Power Collector E mi tter Saturation
Voltage (V
Figure6 : Current Limit Sense Voltage (V
vs Temperature
CEsat)
IPK
Temperature
)vs
Figure8 : Bias Current vs Temperat ure
Figure9 : Supply Current vs Temperature
Figure7 : Reference V oltage v s Temp eratu re
Figure10 : Supply Current vs Input Voltage
5/16
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