0.8A Step Down / Step Up / Inverting DC-DC Converter MC34063C
FEATURES
●
OPERATING FROM 3V TO 40V
●
Low Standby Current
●
Current Limitting
●
Output Switch Current to 0.8A
●
Output Valtage Adjustable
●
Operation Frequency up to 180KHz (CT=100pF)
●
Precision 2% Reference
Application
●
Battery Chargers
●
NICs / Switches / Hubs
●
ADSL Modems
●
Negative Voltage Power Supplies
ORDERING INFORMATION
DESCRIPTION
The MC34063C is a monolithic switching regulator control circuit containing the primary funtio
n
required for DC-DC converters.
This device consists of internal temperature compenssated reference, voltage comparator, cot
r
duty cycle oscillator with active current. The device is specifically designed to be used in Step-
Step-Up and Voltage-Inverting applications with a minimum number of external components.
The MC34063C is the enhanced version of MC34063A with the ability to work in higher frequen
The 34063C is available in 2 pcakages : SOP-8 and DIP-8.
Jan. 2007-Rev 1.0 HTC
1
Device
MC34063CD
MC34063CN
Package
8 SOP
8 DIP
8 SOP/ 8 DIP PIN Configulation
Switch
Emitter
Timing
Capacitor
Ground
Ipk Sense
Vcc
Comparator
- Input
Drive
Collector
Switch
Collector 1
2
3
4
8
7
6
5
SOP-8 PKG DIP-8 PKG
0.8A Step Down / Step Up / Inverting DC-DC Converter MC34063C
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS (NOTE 1)
PARAMETER VALUE UNIT
Power Supply Voltage
Comparator input Voltage Range
Switch Collector Voltage
Switch Emitter Voltage (VSWC=40V)
Switch Collector to Emitter Voltage
Driver Collector Voltage
Driver Collector Current (NOTE 2)
Switch Current
Power Dissipation at Tamb=25℃
Thermal Resistance
Power Dissipation at Tamb=25℃
Thermal Resistance
Operating Juntion Temperature Range
Storage Temperature Range
Absolute Maximum Rating are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Jan. 2007-Rev 1.0 HTC
2
PΘJA
PD
PΘJA
SOP Package
DIP Package
100 ℃/W
0.625 W
40 V
-0.3 to 40 V
40 V
40 V
-65 to +150 ℃
-40 to 150 ℃
VSWE
1.25 WPD
0.8 A
40 V
40 V
160 ℃/W
100 ㎃
TJ
Tstg
SYMBOL
VCE
Vdc
Idc
Isw
Vcc
Vir
VSWC
Ipk Oscillator
s
R
8
3
6
4
5
72
1
Q
+
Vcc
Drive
Collector
Ipk Sense Switch
Emitter
Switch
Collector
GND
-
1.25V
Reference
Regulator
Comparator
lnverting
input
Comparator
Q2
Q1
Timing
Capacitor
0.8A Step Down / Step Up / Inverting DC-DC Converter MC34063C
ELECTRICAL CHARACTERISTICS( Refer to the test circuits, VCC=5V, Ta= -40℃ to 85℃
OSCILLATOR
Frequency V
pin5
= 0 V ,C
T
= 100pF ,T
a
= 25
o
Charge Current V
CC
= 5 to 40V ,T
a
= 25oC
Discharge Current V
CC
= 5 to 40V ,T
a
= 25oC
Discharge to Charge Current Ratio Pin 7= V
CC
,T
a
= 25oC
Current Limit Sense Voltage I
chg
= I
dischg
,T
a
= 25oC
OUTPUT SWITCH (NOTE 3)
Saturation Voltage,
Darlington connection
ISW= 1A ,R
p
in8= 82Ω to VCC,
Forced β ~ 20
DC Current Gain I
SW
= 1A, V
CE
= 5V, T
a
= 25oC
Collector Off-State Current VCE= 40V
COMPARATOR
T
a
= 25oC
Ta= TLOW to THIGH
Threshold Voltage Line Regulation VCC= 3 to 40V
Input Bias Current VIN= 0V
TOTAL DEVICE
VCC= 5 to 40V, CT=1㎋
Pin7= VCC ,V
p
in5>Vth, Pin2=GN
D
Remaining pins open
for MC34063C
Notes:
1Stresses
g
reater than those listed under "Absolute Maximum Ratin
g
s" ma
y
cause
p
ermanent dama
g
e to the devi
c
These are stress retin
g
s onl
y
, and functional o
p
eration of the device at these or an
y
other conditions be
y
ond tho
s
indicated under "Recommended O
p
eratin
g
Conditions" is not im
p
lied. Ex
p
osure to "Absolute Maximum Ratin
g
s" f
extended periods may affect device reliability.
2Maximum package power dissipation limits must be observed.
3Low duty cycle pulse technique are used during test to maintain juntion temperature as close to ambient
Temperature as possible.
4If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents (≤300mA) and
high driver currents (≥30mA), it may take up to 2.0 ㎲for it to come out of saturation. This condition will shorten
the off time at frequencies 30kHz, and is magnified at high temperatures. This condition does not occur with a
Darlington configuration, since the output switch cannot saturate.
Jan. 2007-Rev 1.0 HTC
1.25
VCE(sat)
VCE(sat)
Vth
Saturation Voltage (NOTE 4)
ISW= 1A ,Pins 1,8 connected
Threshold Voltage V
1.29
3
ICC Supply Current
TYP.
1.21
SYMBOL PARAMETER
MAX. UNI
T
SYMBOL PARAMETER TEST CONDITIONS MIN.
2.5 4 ㎃
㎷
IIB -20 -400 ㎁
Regline 1.4 5
V
1.225 1.275
㎂
UNI
T
V
TEST CONDITIONS MIN. TYP. MAX.
IC(off) 0.01 100
hFE 50 75
0.45 0.8
TYP. MAX. UNI
T
1 1.3 V
SYMBOL PARAMETER TEST CONDITIONS MIN.
Vipk(sense) 250 300 350 ㎷
Idischg/Ichg 5.2 6.5 7.5
㎂
Idischg 180 240 290 ㎂
Ichg 30 38 45
TYP. MAX. UNI
T
FOSC 170 180 190 KHz
SYMBOL PARAMETER TEST CONDITIONS MIN.
0.8A Step Down / Step Up / Inverting DC-DC Converter MC34063C
TYPICAL PERFORMANCE CHARACTERISTICS
Jan. 2007-Rev 1.0 HTC
4
0.8A Step Down / Step Up / Inverting DC-DC Converter MC34063C
TYPICAL APPLICATION CIRCUIT
Step-Up Converter
DRC SWC
Ipk SWE
Vcc TC
VIN CII GND VOUT
12V 28V/175㎃
MC34063C
Step-Down Converter
DRC SWC
Ipk SWE
Vcc TC
VIN CII GND
25V
MC34063C
VOUT
5V/0.5A
Jan. 2007-Rev 1.0 HTC
5
C2
100㎌
+
R1
C3
1500pF
R3
Rsc
R2
D1
IN5819
C1
330㎌
+
L1
8
7
6
5
1
2
3
4
180Ω
0.4Ω
2.2KΩ 47KΩ
120μH
C2
100㎌
+
R1
C3
470㎊
Rsc
R2
IN5819
D1
C1
470㎌
+
220μH
L
8
7
6
5
1
2
3
4
0.4Ω
1.2KΩ 3.6KΩ
0.8A Step Down / Step Up / Inverting DC-DC Converter MC34063C
Step-Up With External NPN Switch
VOUT
VIN
Voltage Inverting Converter
DRC SWC
Ipk SWE
Vcc TC
VIN CII GND
4.5V to 6V
MC34063C
VOUT
-12V /100㎃
Jan. 2007-Rev 1.0 HTC
6
C2
100㎌
+
R2
C3
1.5㎋
R3
R1
D1
BYV10-40
C1
1000㎌
+
L1
8
7
6
5
1
2
3
4
0.4Ω
8.2KΩ 953Ω
-
+
Rsc
+
1
2
3
4
5
6
7
8
Q2
Q1
comparator
Ipk Oscillator
1.25V
Reference
Regulator
150μH
S Q
R
0.8A Step Down / Step Up / Inverting DC-DC Converter MC34063C
Step-Down With External NPN Switch
VOUT
VIN
Step-Down With External PNP Switch
VOUT
VIN
Jan. 2007-Rev 1.0 HTC
7
-
+
Rsc
+
2
3
4
5
6
Q2
Q1
comparator
Ipk Oscillator
1.25V
Reference
Regulator
1
8
7
-
+
Rsc
+
2
3
4
5
6
7
8
Q2
Q1
comparator
Ipk Oscillator
1.25V
Reference
Regulator
1
S Q
R
S Q
R
0.8A Step Down / Step Up / Inverting DC-DC Converter MC34063C
Voltage Inverting With External NPN Switch
VOUT
VIN
Voltage Inverting With External PNP Saturated Switch
VOUT
VIN
Jan. 2007-Rev 1.0 HTC
8
-
+
Rsc
5
6
7
8
Q2
Q1
comparator
Ipk Oscillator
1.25V
Reference
Regulator
1
+
-
+
Rsc
Q2
Q1
comparator
Ipk Oscillator
1.25V
Reference
Regulator
+
S Q
R
S Q
R
2
3
4
8
7
6
5
4
3
2
1
0.8A Step Down / Step Up / Inverting DC-DC Converter MC34063C
Dual Output Voltage
+12V
GND
-12V
VIN
Higher Output Power, Higher Input Voltage
+VOUT
-VOUT
VIN
Jan. 2007-Rev 1.0 HTC
9
Rsc
5
Q2
Q1
comparator
Ipk Oscillator
1.25V
Reference
Regulator
+
+
6
7
8
1
2
3
4
S Q
R
Rsc
2
3
4
6
Ipk Oscillator
1.25V
Reference
Regulator
7
1
8
5
+
+
Isolated from input
S Q
R
comparator
-
+
-
+
