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DC-DC Converter Control Circuits
MC34063A
OUTPUT SWITCH CURRENT IN EXCESS OF
1.5A 2% REFERENCE ACCURACY LOW QUIESCENT CURRENT:2.5mA(TYP.) OPERATING FROM 3V TO 40V REQUENCY OPERATION TO 100KHz ACTIVE CURRENT LIMITING
8 SOP/ 8 DIP PIN Configulation
Switch 1 Collector Switch 2 Emitter Timing 3 Capacitor Ground
8 7 6
Drive Collector Ipk Sense Vcc Comparator
DESCRIPTION
The MC34063A series is a monolithic control circuit delivering the main functions for DC-DC voltage converting. The device contains an intermal 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 devices series is designed for Step-Down, Step-Up and Voltage-lnverting applications.
4
5 - Input
ORDERING INFORMATION
Device MC34063AD MC34063AN Package 8 SOP 8 DIP
BLOCK DIAGRAM
Drive Collector
8
s
R Q Q2 Q1
1
Switch Collector
Ipk Sense
7
Ipk Oscillator
2 3
Switch Emitter
Timing Capacitor
Vcc
6
Comparator
+ Comparator lnverting input
1.25V Reference Regulator
4
GND
5
HTC
1
DC-DC Converter Control Circuits
ABSOLUTE MAXIMUM RATINGS
SYMBOL Vcc Vir VSWC VSWE VCE Vdc Idc Isw Ptot Top PARAMETER 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 Switch Current Power Dissipation at Tamb=25(for Plastic Package ) (for SOIC Package ) Operating Ambient Temperature Range
MC34063A
VALUE 50 -0.3 to 40 40 40 40 40 100 1.5 1.25 0.625 0 to 70
UNIT V V V V V V
A W
Tstg
Storage Temperature Range
-40 to 150
Absolute Maximum Rating are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
THERMAL DATA
SYMBOL PARAMETER Rthi-amb Thermal Resistance Junction-ambient (*)
( ) This Value depends from thermal design of PCB on which the device is mounted.
*
Max
DIP-8 100
SO-8 160
UNIT /w
CONNECTION DIAGRAM (top view) SWC SWE TC GND 4 5
SC11080
PIN CONNECTIONS
PIN NO 1 2 3 4 5 6 7 8 SYMBOL SWC SWE TC GND CII Vcc IPK DRC NAME AND FUNCTION Switch Collector Switch Emitter Timing Capactor Ground Comparator lnverting lnput Voltage Supply IPK Sense Voltage Driver Collector
1
8
DRC IPK VCC CII
HTC
2
DC-DC Converter Control Circuits
MC34063A
ELECTRICAL CHARACTERISTICS( Refer to the test circuits, VCC=5V, Ta=TLOW to THIGH, unless
otherwise specified, see note 2)
OSCILLATOR
SYMBOL FOSC Ichg Idischg Idischg/Ichg Vipk(sense) PARAMETER Frequency Charge Current Discharge Current Discharge to Charge Current Ratio Current Limit Sense Voltage TEST CONDITIONS MIN. o Vpin5= 0 V ,CT= 1nF ,Ta= 25 C 24 o 24 VCC= 5 to 40V ,Ta= 25 C o 140 VCC= 5 to 40V ,Ta= 25 C o 5.2 Pin 7= VCC ,Ta= 25 C o 250 Ichg= Idischg ,Ta= 25 C TYP. 33 33 200 6.2 300 MAX. UNIT 42 KHz 42 260 7.5 350
OUTPUT SWITCH
SYMBOL PARAMETER VCE(sat) Saturation Voltage, Darlington connection VCE(sat) Saturation Voltage hFE IC(off) DC Current Gain Collector Off-State Current TEST CONDITIONS ISW= 1A ,Pins 1,8 connected ISW= 1A ,Rpin8= 82 to VCC, Forced ~ 20 ISW= 1A, VCE= 5V, Ta= 25oC VCE= 40V MIN. TYP. 1 0.45 50 120 0.01 MAX. UNIT 1.3 V 0.7 V
100
COMPARATOR
SYMBOL PARAMETER Vth Threshold Voltage Regline IIB Threshold Voltage Line Regulation Input Bias Current TEST CONDITIONS Ta= 25oC Ta= TLOW to THIGH VCC= 3 to 40V VIN= 0V MIN. TYP. 1.225 1.25 1.21 1 -5 MAX. UNIT 1.275 V 1.29 V 5 -400
TOTAL DEVICE
SYMBOL PARAMETER ICC Supply Current TEST CONDITIONS MIN. VCC= 5 to 40V, CT=1 Pin7= VCC ,Vpin5>Vth, Pin2=GND Remaining pins open for MC34063A Ta= 25oC ,CT=1 ,Pin5= 0V for MC34063A TYP. 2.5 MAX. UNIT 4
VSTART-UP Start-up Voltage(note 4)
2.1
V
Notes:
1) Maximum package power dissipation limit must be observed. 2) TLOW= 0oC, THIGH 70oC = 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: /(I -1* )10 Forced of output current switch= I COUTPUT CDRIVER
*
Current less due to a built in 1K antileakage resistor.
4) Start-up Voltage is the minimum Power Supply Voltage at which the internal oscillator begains to work.
HTC
3
DC-DC Converter Control Circuits
TYPICAL ELECTRICAL CHARACTERISTICS
Emitter Follower Configuration Output Saturation Voltage vs Emitter Current
VCE(sat) (V) 1.75 1.70 1.65 1.60 1.55 1.50 1.45 1.40 0 400 800 1200 IE() 0 0.01 0.1 1 100 VCC=5V Pin1,7,8=VCC Pins3,5=GND Ta=25
MC34063A
Output Switch ON-OFF Time vs Oscillator
Timing Capacitor
Ton Toff () 200 150 VCC=5V Pin7=VCC Pin5=GND Ta=25
Ton
50
Toff
CT()
Common Emitter Configuration Output Switch Saturation Voltage vs Collector Current
VCE(sat) (V) 1.0 0.8 0.6 0.4 0.2 0 0 400 800 1200 1C() VCC=5V Pin7=VCC Pins2,3,5=GND Ta=25 Forced =20 Darlington Connection
Darlington Configuration Collector Emitter Saturation Voltage (VCE(sat) ) vs Temperature
VCE(sat) () 1000 950 900 850 800 750 -40 VCC=5V
IC=1A
0
40
80
120
TJ()
Power Collector Emitter Ssturation Voltage (VCE(sat)) vs Temperature
VCE(sat) () 600 VCC=5V 550 500 450 400 350 -40
Current Limit Sense Voltage Voltage (Vipk) vs Temperature
Vipk () 320 MC34063A 310 300 290 VCC=5V 280 270 -40
IC=1A
Ichg=Idischg
0 40 80 120 TJ()
0
40
80
120
TJ()
HTC
4
DC-DC Converter Control Circuits
TYPICAL ELECTRICAL CHARACTERISTICS (Continued)
Reference Voltage vs Temperature
Vref (V) 1.265 VCC=5V 1.260 1.255 1.250 1.245 1.240 -40 8 6 4 2 0 -40
MC34063A
Bias Current vs Temperature IBias
() 10 VCC=5V CII to GND
0
40
80
120
TJ()
0
40
80
120
TJ()
Supply Current vs Temperature ICC
() 5 4 3 2 1 0 -40 VCC=5V CT=1
Supply Current vs Input Voltage ICC
() 4.0 3.5 3.0 2.5 2.0 1.5 TJ= 25 CT= 1
0
40
80
120
TJ()
0
10
20
30
40 Vin(V)
HTC
5
DC-DC Converter Control Circuits
TYPICAL APPLICATION CIRCUIT
Step-Up Converter
L1
170H
MC34063A
R3
180
8
1
DRC
7
SWC
2
Ipk
Rsc
0.22
SWE TC GND
3
D1
BYV10-40
6
Vcc
5
VIN
12V
C2
100
+
CII
4
C3
1.5
VOUT
25V/175
MC34063A R1 R2
44K
2.2K
+ C1
330
Step-Down Converter
8
1
DRC
Rsc
0.33
SWC
2
BYV10-40
7
Ipk
6
SWE TC GND
3
D1
Vcc
5
VIN
25V
C2
100
+
CII
4
L C3
470 220H
MC34063A R1 R2
3.5K
1.2K
+ C1
470
VOUT
5V/0.5A
HTC
6
DC-DC Converter Control Circuits
Step-Up With External NPN Switch
MC34063A
8 1
S Q
VOUT +
Q2 Q1
R
2 7
Rsc VIN
6
comparator
Ipk Oscillator
3
+ 5
1.25V Reference Regulator
4
Voltage Inverting Converter
8
1
DRC
R3
0.22
SWC
2
7
L1
90H
Ipk
6
SWE
3
Vcc
5
TC
4
D1 C3
1.5 BYV10-40
VIN
4.5V to 5V
C2
100
+
CII
GND
MC34063A R1 VOUT
953
R2
8.2K
C1 +
1000
-12V /100
HTC
7
DC-DC Converter Control Circuits
Step-Down With External NPN Switch
MC34063A
8 1
S Q
Q2 Q1
R
2 7
Rsc
6
Ipk Oscillator
3
VOUT +
VIN
comparator
+ 5
1.25V Reference Regulator
4
Step-Down With External PNP Switch
8 1
S Q
Q2 Q1
R
+
2 7
VOUT
Rsc VIN
6
comparator
Ipk Oscillator
3
+ 5
1.25V Reference Regulator
4
HTC
8
DC-DC Converter Control Circuits
Voltage Inverting With External NPN Switch
MC34063A
8 1
S Q
Q2 Q1
R
2 7
Rsc VIN
6
comparator
Ipk Oscillator
3
VOUT +
+ 5
1.25V Reference Regulator
4
Voltage Inverting With External PNP Saturated Switch
8 1
S Q
Q2 Q1
R
VOUT +
2
7
Rsc VIN
6
comparator
Ipk Oscillator
3
+ 5
1.25V Reference Regulator
4
HTC
9
DC-DC Converter Control Circuits
Dual Output Voltage
MC34063A
+
+12V
GND
8 1
+
S Q
Q2 Q1
-12V
R
2 7
Rsc VIN
6
Ipk Oscillator
3
comparator
1.25V
+ 5
Reference Regulator
4
Higher Output Power, Higher Input Voltage
+
Isolated from input
+VOUT -VOUT
8 1
S Q
+
R
2 7
VIN Rsc
6
comparator
1.25V
Ipk Oscillator
3
+ -
Reference Regulator
4
5
HTC
10

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