MC34063AB, MC34063AC,
MC34063EB, MC34063EC
DC-DC converter control circuits
Datasheet
-
production data
Description
The MC34063A/E series is a monolithic control
circuit which delivers 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/E device series is
designed for step-down, step-up and voltage-
inverting applications.
DIP-8
SO-8
Features
Output switch current in excess of 1.5 A
2 % reference accuracy
Low quiescent current: 2.5 mA (typ.)
Operating from 3 V to 40 V
Frequency operation to 100 kHz
Active current limiting
Table 1. Device summary
Order codes
DIP-8
MC34063ABN
MC34063ACN
MC34063EBN
MC34063ECN
SO-8
MC34063ABD-TR
MC34063ACD-TR
MC34063EBD-TR
MC34063ECD-TR
April 2013
This is information on a product in full production.
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Contents
MC34063AB, MC34063AC, MC34063EB, MC34063EC
Contents
1
2
3
4
5
6
7
8
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
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MC34063AB, MC34063AC, MC34063EB, MC34063EC
Diagram
1
Diagram
Figure 1. Block diagram
DocID5257 Rev 11
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Pin configuration
MC34063AB, MC34063AC, MC34063EB, MC34063EC
2
Pin configuration
Figure 2. Pin connections
Table 2. Pin description
Pin n°
1
2
3
4
5
6
7
8
Symbol
SWC
SWE
TC
GND
CII
V
CC
I
PK
DRC
Switch collector
Switch emitter
Timing capacitor
Ground
Comparator inverting input
Voltage supply
I
PK
sense
Voltage driver collector
Name and function
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DocID5257 Rev 11
MC34063AB, MC34063AC, MC34063EB, MC34063EC
Maximum ratings
3
Maximum ratings
Table 3. Absolute maximum ratings
Symbol
V
CC
V
IR
V
SWC
V
SWE
V
CE
V
DC
I
DC
I
SW
P
TOT
T
J
T
STG
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
Switch current
for DIP-8
Power dissipation at T
A
= 25°C
Operating junction temperature
Storage temperature range
for AC and EC
series
for AB series
for EB series
for SO-8
Parameter
Value
50
-0.3 to 40
40
40
40
40
100
1.5
1.25
W
0.625
150
-40 to 150
0 to 70
-40 to 85
-40 to 125
°C
°C
°C
Unit
V
V
V
V
V
V
mA
A
T
OP
Operating ambient temperature
range
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 4. Thermal data
Symbol
R
thJA
R
thJC
Parameter
Thermal resistance junction-ambient
(1)
Thermal resistance junction-case
DIP-8
100
42
SO-8
160
20
Unit
°C/W
°C/W
1. This value depends from thermal design of PCB on which the device is mounted.
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