MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
1
!
FEATURES
"
3V to 30V Input Voltage Operation.
"
Internal 1.6A Peak Current Switch.
"
Internal
1.8% Reference.
"
Low Quiescent Current at 1.6mA.
"
Frequency Operation from 100Hz to 100KHz.
"
Current Limiting.
!
APPLICATIONS
"
Saver for Cellular phones
"
DC-DC Converter Module
!
DESCRIPTION
The MC34063A by Analog Integrations
Corporation, an improved second source over the
industrial standard MC34063A, is a monolithic
control circuit containing the primary functions
required for DC/DC converters. The device
consists of an internal temperature compensated
reference, comparator, controlled duty cycle
oscillator with an active current limit circuit, driver
and high current output switch. This device is
specifically designed to be incorporated in step-
down, step-up and voltage-inverting applications
with a minimum number of external components.
The
1.8% internal reference and low quiescent
current of 1.6mA are among the improvements of
the device over the competition.
!
TYPICAL APPLICATION CIRCUIT
MC34063A
IPK
8
7
6
5
4
3
2
1
FB
VCC
DRI
SC
SE
TC
GND
V
IN
L
200
H
RB
33K
C1
D1
1N5819
CT
470pF
RA
5.6K
*RS
V
OUT
8.6V SAVER
*:Io=0.3/RS
+
100
F
220
F
C
O
+
Saver Circuit for Cellular Phone
!
ORDERING INFORMATION
MC34063A XX
ORDER NUMBER
MC34063ACN
(PLASTIC DIP)
PIN CONFIGURATION
MC34063ACS
(PLASTIC SO)
TOP VIEW
VCC
DRI
SE
TC
GND
IPK
FB
SC 1
3
4
2
8
6
5
7
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
TEMPERATURE
C: 0
C~+70
C
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
2
!
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
.......................................................................................................
30V
Comparator Input Voltage Range
.................................................................. -0.3V~30V
Switch Collector Voltage
............................................................................................30V
Switch Emitter Voltage
..............................................................................................30V
Switch Collector to Emitter Voltage
...........................................................................30V
Driver Collector Voltage
............................................................................................30V
Switch Current
.........................................................................................................1.6A
Power Dissipation and Thermal Characteristics
DIP Package
Ta=
25
C ........................................................................1.0W
Thermal
Resistance .................................................100
C /W
SO Package
Ta=
25
C.......................................................................625mW
Thermal
Resistance .................................................160
C /W
Operating Junction Temperature ..............................................................................125
C
Operating Ambient Temperature Range
............................................................0
C~70
C
Storage Temperature Range ...................................................................... - 65
C~150
C
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
3
!
ELECTRICAL CHARACTERISTICS
(VCC= 5V, Ta=25
C
, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
Oscillator
Charging Current
5.0V
VCC
30V
I
CHG
10
25
40
A
Discharge Current
5.0V
VCC
30V
I
DISCHG
100
150
200
A
Voltage Swing
PIN 3
V
OSC
0.6
V
Discharge to Charge Current
Ratio
V
IPK(SENSE)
=VCC
I
DISCHG/
I
CHG
6.0
Current Limit Sense Voltage
I
CHG
=I
DISCHG
V
IPK(SENSE)
250
300
350
mV
Output Switch
Saturation Voltage, Darlington
Connection
I
SW
=1.0A;
V
C(DRIVER)
=V
C(SWITCH)
V
CE(SAT)
1.0
1.3
V
Saturation Voltage
I
SW
=1.0A; I
C(DRIVER)
=50mA
(Forced
20)
V
CE (SAT)
0.4
0.7
V
DC Current Gain
I
SW
=1.0A; V
CE
=5.0V
h
FE
35
120
Collector Off-State Current
V
CE
=30V
I
C(OFF)
10
nA
Comparator
Threshold Voltage
Threshold Voltage
0
C
Ta
70
C
V
FB
1.227
1.21
1.25
1.273
1.29
V
V
Threshold Voltage Line
Regulation
3.0V
VCC
30V
REG
LINE
0.1
0.3
mV/V
Input Bias Current
V
IN
=0V
I
IB
0.4
1
A
Supply current
V
IPK(SENSE)
=VCC
V
PIN 5
>V
FB
5.0V
VCC
30V
C
T
=0.001
F, PIN 2=GND
Remaining pins open
I
CC
1.6
3
mA
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
4
!
TYPICAL PERFORMANCE CHARACTERISTICS
C
T
, Oscillator Timing Capacitor (nF)
t
O
N
-
O
FF
O
u
t
p
u
t
S
w
i
t
c
h
O
N
-O
FF
Ti
m
e
(
S)
Output Switch ON-OFF Time vs. Oscillator
Timing Capacitor
0.1
1
10
100
1
10
OFF TIME
VCC=5V
V
IPK
=VCC
PIN
5=GND
100
1000
ON TIME
0
5
10
15
20
25
30
0
0.4
0.8
1.2
1.6
2
C
T
=1nF
V
IPK
=VCC
PIN 2=GND
VCC, Supply Voltage (V)
I
CC
, S
uppl
y
C
u
r
r
ent (m
A
)
Standby Supply Current vs. Supply Voltage
V
FB
,
T
h
r
e
shol
d V
o
l
t
age (V
)
Temperature (
C)
V
FB
, Threshold Voltage vs Temperature
0
10
20
30
40
50
60
70
80
1.2
1.22
1.24
1.26
1.28
1.3
VCC = 5V,
C
T
= 1nF
PIN 2 = GND
250
260
270
280
290
300
310
320
330
340
350
IPK Threshold Voltage vs Temperature
Temperature (
C)
V
IP
K
,
T
h
r
e
shol
d V
o
l
t
age (m
V
)
0
10
20
30
40
50
60
70
80
VCC = 5V
C
T
= 1nF
PIN 5 = GND
Emmiter-Follower Configuration Output Switch
Saturation Voltage vs Emmiter Current
I
E
, Emitter Current (A)
1.2
1.3
1.4
1.5
1.6
1.7
1.8
V
CE(
S
A
T
E)
S
a
tur
a
ti
on V
o
l
t
age (
V
)
0
0.5
1
1.5
VCC = 5V
PIN 1, 7, 8 = VCC
PIN 3, 5 = GND
I
C
, Collector Current (A)
V
CE
(
S
A
T
)
, S
a
tu
r
a
ti
o
n
V
o
l
t
ag
e
(V
)
1.5
Common-Emitter Configuration Output Switch
Saturation Voltage vs Collector Current
VCC = 5V
PIN 7 = VCC
PIN 2, 3, 5 = GND
Forced Beta = 20
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0
0.5
1
VCC = 5.0V
PIN 7 =VCC
PINS 2, 3, 5 = GND
Darlington Connection
Forced Beta = 20
MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
5
!
BLOCK DIAGRAM
Q
R
S
8
7
6
5
4
3
2
1
Q1
IS
CT
-
+
Q2
80
DRI
IPK
VCC
FB
GND
TC
SC
SE
Oscillator
Comparator
1.25V
Reference
Voltage
!
PIN DESCRIPTIONS
PIN 1: SC
- 1.6A switch collector
PIN 2: SE
- Darlington switch emitter
PIN 3: TC
- Oscillator timing capacitor
PIN 4: GND - Power GND
PIN 5: FB
- Feedback comparator inverting input
PIN 6: VCC - Power supply input
PIN 7: IPK
- Highside current sense input,
VCC
-
V
IPK
=300mV
PIN 8: DRI
- Drive collector
!
APPLICATION INFORMATION
DESIGN FORMULA TABLE
CALCULATION
STEP-DOWN
STEP-UP
VOLTAGE-INVERTING
t
t
ON
OFF
V + V
V
- V - V
OUT
F
IN(MIN)
SAT
OUT
V + V
V
V
- V
OUT
F
IN(MIN)
IN(MIN)
SAT
-
V
+ V
V - V
OUT
F
IN
SAT
(t
ON
+ t
OFF
)
MAX
1
F
MIN
1
F
MIN
1
F
MIN
C
T
4x10
-5
t
ON
4 x 10
-5
t
ON
4 x 10
-5
t
ON
I
C (SWITCH)
2I
OUT(MAX)
2I
OUT(MAX)
(
)
t + t
t
ON
OFF
OFF
2I
OUT(MAX)
(
)
t + t
t
ON
OFF
OFF
RS
0.33/I
C(SWITCH)
0.33/ I
C (SWITCH)
0.33/ I
C (SWITCH)
L(MIN)
V
- V
- V
I
t
IN(MIN)
SAT
OUT
C(SWITCH)
ON(MAX)
V
- V
I
t
IN(MIN)
SAT
C(SWITCH)
ON(MAX)
V
- V
I
t
IN(MIN)
SAT
C(SWITCH)
ON(MAX)
Co
I
(t
+ t
8V
C ( SWITCH)
ON
OFF
RIPPLE ( P - P )
)
I t
V
OUT
ON
RIPPLE(P - P)
I t
V
OUT
ON
RIPPLE(P - P)
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