DC-DC Converter Control Circuits
FEATURES
Output Switch Current In Excess of 1.5A
2% Reference Accuracy
Low Quiescent Current : 2.5mA(Typ.)
Operating From 3V to 40V
Frequency Operation to 100KHz
Active Current Limiting
Moisture Sensitivity Level 3D
MC34063AG is Halogen Free Products
MC34063A/B
SOP-8 PKG
DIP-8 PKG
APPLICATION
Battery Chargers
NICs / Switches / Hubs
ADSL Modems
Negative Voltage Power Supplies
ORDERING INFORMATION
Device
MC34063AD
MC34063AGD
MC34063BD
MC34063AN
DIP-8
SOP-8
Package
DESCRIPTION
The MC34063A/B 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 voltage is adjustable through two external resistors with a 2% reference accuracy.
Employing a minimum number of external components the MC34063A/B devices series is designed for Step-
Down, Step-Up and Voltage-Inverting applications.
Absolute Maximum Ratings
(Note 1)
CHARACTERISTIC
Power Supply Voltage
Comparator Input Voltage Range
Switch Collector Voltage
Switch Emitter Voltage(V
SWC
=40V)
Switch Collector to Emitter Voltage
Driver Collector Voltage
Driver Collector Current
(Note 2)
Switch Current
SYMBOL
V
CC
V
IR
V
SWC
V
SWE
V
CE
V
dc
I
dc
I
SW
MIN.
-
-0.3
MAX.
50
40
40
40
40
UNIT
V
V
V
V
V
V
mA
A
-
-
-
40
100
1.5
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DC-DC Converter Control Circuits
Absolute Maximum Ratings
(Continued)
CHARACTERISTIC
Power Dissipation (at T
A
= 25°C)
SOP-8
DIP-8
SOP-8
DIP-8
MC34063A/B
SYMBOL
PD
MAX_SOP-8
PD
MAX_DIP-8
MIN.
MAX.
1.250
0.625
100
160
UNIT
W
W
°C/W
°C/W
°C
°C
°C
°C
Thermal Resistance
Operating Junction Temperature Range
Operating Ambient Temperature Range
Storage Temperature Range
conditions is not implied.
θ
JA-SOP-8
θ
JA-DIP-8
T
J
-40
0
-40
-65
150
75
85
150
MC34063A
MC34063B
T
AOPR
T
STG
Note 1. Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these
THERMAL DATA
SYMBOL
R
THJ-AMB
PARAMETER
Thermal Resistance Junction-Ambient(*)
Max
DIP-8
100
SOP-8
160
UNIT
℃/W
(*) This value depends from thermal design of PCB on which the device is mounted.
Ordering Information
Operating Ambient Temperature(T
AOPR
) Range
0℃~70℃
0℃~70℃
-40℃~85℃
0℃~70℃
-40℃~85℃
DIP8
SOP8
Package
Order No.
MC34063AD
MC34063AGD
MC34063BD
MC34063AN
MC34063BN
Supplied As
Reel
Reel
Reel
Tube
Tube
Status
Active
Contact us
Active
Active
Active
MC 34063
Package Type
Green Mode
D : SOP8
N : DIP8
G
: Halogen Free
Blank : Pb Free
A : 0℃~70℃
B : -40℃~85℃
Temperature Range
Root Name
Product Code
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DC-DC Converter Control Circuits
PIN CONFIGURATION
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
MC34063A/B
SOP-8
DIP-8
PIN DESCRIPTION
Pin No.
Name
1
2
3
4
5
6
7
8
Switch Collector
Switch Emitter
Timing Capacitor
GND
Comparator Inverting Input
V
CC
I
PK
Sense
Driver Collector
SOP-8 / DIP-8 PKG
Function
Internal switch transistor collector
Internal switch transistor emitter
Timing Capacitor to control the switching frequency
Ground pin for all internal circuits
Inverting input pin for internal comparator
Voltage supply
Peak Current Sense Input by monitoring the voltage drop across an
external I sense resistor to limit the peak current through the switch
Voltage driver collector
BLOCK DIAGRAM
Driver
Collector
8
S
R
Q
1
Q1
Switch
Collector
Q2
2
I
PK
Sense
7
I
PK
Oscillator
Switch
Emitter
Timing
Capacitor
3
V
CC
6
Comparator
Comparator
Inverting
Input
+
-
5
1.25V
Reference
Regulator
4
GND
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DC-DC Converter Control Circuits
ELECTRICAL CHARACTERISTICS
(Refer to the test circuits, V
CC
=5V, T
A
=T
LOW
to T
HIGH
, unless otherwise specified, see note 2)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN.
MC34063A/B
TYP.
MAX.
UNIT
OSCILLATOR
F
OSC
I
CHG
I
DISCHG
I
DISCHG
/I
CHG
V
IPK(SENSE)
Frequency
Charge Current
Discharge Current
Discharge to Charge Current Ratio
Current Limit Sense Voltage
V
PIN5
=0V, C
T
=1nF, T
A
=25℃
V
CC
=5 to 40V, T
A
=25℃
V
CC
=5 to 40V, T
A
=25℃
Pin 7= V
CC
, T
A
=25℃
I
CHG
=I
DISCHG
, T
A
=25℃
24
24
140
5.2
250
33
35
220
6.5
300
42
42
260
7.5
350
mV
KHz
㎂
㎂
OUTPUT SWITCH
V
CE(SAT)
V
CE(SAT)
h
FE
I
C(OFF)
Saturation Voltage,
Darlington connection
Saturation Voltage
DC Current Gain
Collector Off-State Current
I
SW
=1A, Pins 1,8 connected
I
SW
=1A, R
PIN8
=82Ω to V
CC
,
Forced
β
~ 20
I
SW
=1A, V
CE
=5V, T
A
=25℃
V
CE
= 40V
50
1.0
0.45
75
0.01
100
㎂
1.3
0.7
V
V
COMPARATOR
V
TH
REG
LINE
I
IB
Threshold Voltage
Threshold Voltage Line Regulation
Input Bias Current
T
A
=25℃
1.225
1.21
1
-5
1.25
1.275
1.29
5
-400
V
V
mV
nA
T
A
=T
LOW
to T
HIGH
V
CC
= 3 to 40V
V
IN
= 0V
TOTAL DEVICE
V
CC
= 5 to 40V, C
T
=1nF
Pin7= V
CC
, V
PIN5
>V
TH
, Pin2=GND
Remaining pins open
for MC34063A/B
I
CC
Supply Current
1.4
4
mA
Note 1. Maximum package power dissipation limit must be observed.
Note 2. T
LOW
= '-30
℃
, T
HIGH
= '+125
℃
Note 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
β
of output switch :
Ι
C(OUTPUT)
Ι
C(DRIVER)
- 7.0mΑ *
≥
10
* Currentless due to a built in 1K
Ω
anti-leakage resistor
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DC-DC Converter Control Circuits
TYPICAL ELECTRICAL CHARACTERISTICS
Emitter Follower Configuration Output
Saturation Voltage vs. Emitter Current
MC34063A/B
Output Switch ON-OFF Time
vs. Oscillator Timing Capacitor
Common Emitter Configuration Output Switch
Saturation Voltage vs. Collector Current
Darlington Configuration Collector Emitter
Saturation Voltage (V
CE(SAT)
) vs. Temperature
Power Collector Emitter Saturation
Voltage (V
CE(SAT)
) vs, Temperature
Current Limit Sense Voltage (V
IPK
)
vs. Temperature
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