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Preliminary Datasheet 0.8A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER General Description
The AZ34063C is a monolithic switching regulator control circuit containing the primary functions required for DC-DC converters. This device consists of internal temperature compensated reference, voltage comparator, controlled duty cycle oscillator with active current limit circuit, driver and high current output switch. This device is specifically designed to be used in Step-Down, Step-Up and Voltage-Inverting applications with a minimum number of external components. The AZ34063C is the enhanced version of AZ34063 with the ability to work in higher frequency. The AZ34063C is available in 2 packages: SOIC-8 and DIP-8.
AZ34063C
Features
* * * * * * * Operation from 3.0V to 36V Input Low Standby Current Current Limiting Output Switch Current to 0.8A Output Voltage Adjustable Operation Frequency up to 180KHz (CT=100pF) Precision 2% Reference
Applications
* * * * Battery Chargers NICs/ Switches/ Hubs ADSL Modems Negative Voltage Power Supplies
SOIC-8
DIP-8
Figure 1. Package Types of AZ34063C
Apr. 2005 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet 0.8A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER Pin Configuration AZ34063C
P/M Package (DIP-8/SOIC-8)
Switch Collector Switch Emitter Timing Capacitor GND 1 2 3 4 8 7 6 5 Driver Collector IPK Sense VCC Comparator Inverting Input
Top View
Figure 2. Pin Configuration of AZ34063C
Functional Block Diagram
Driver Collector
8 B A S R Q
1
Switch Collector
IPK Sense
7 Ipk IPK OSC
2
Switch Emitter
CT
VCC
6
3
Timing Capacitor
+ -
1.25V Reference Regulator
Comparator Inverting Input
5
4
GND
Figure 3. Functional Block Diagram of AZ34063C
Apr. 2005 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet 0.8A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER Pin Description
Pin Number 1 2 3 4 5 6 7 8 Pin Name Switch Collector Switch Emitter Timing Capacitor GND Comparator Inverting Input VCC IPK Sense Driver Collector 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
AZ34063C
Ordering Information
AZ34063C
E1: Lead Free Blank: Tin Lead TR: Tape and Reel Blank: Tube
Circuit Type Package M: SOIC-8 P: DIP-8
Package
Temperature Range -40 to 85oC -40 to 85oC
Part Number Tin Lead AZ34063CM AZ34063CMTR AZ34063CP Lead Free AZ34063CM-E1
Marking ID Tin Lead 34063CM Lead Free 34063CM-E1 34063CM-E1 AZ34063CP-E1
Packing Type Tube Tape & Reel Tube
SOIC-8 DIP-8
AZ34063CMTR-E1 34063CM AZ34063CP-E1 AZ34063CP
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Apr. 2005 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet 0.8A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER Absolute Maximum Ratings (Note 1)
Parameter Power Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage (Vpin1=40V) Switch Collector to Emitter Voltage Driver Collector Voltage Driver Collector Current (Note 2) Switch Current Power Dissipation and Thermal Characteristics Plastic Package, Power Dissipation (TA = 25 ) Thermal Resistance SOIC Package, Power Dissipation (TA = 25 ) Thermal Resistance Operating Junction Temperature Storage Temperature Range ESD (Human body model) Symbol VCC VIR VC(switch) VE(switch) VCE(switch) VC(driver) IC(driver) ISW Value 40 -0.3 to 40 40 40 40 40 100 0.8 Unit V V V V V V mA A
AZ34063C
PD RJ PD RJA TJ TSTG
1.25 100 625 160 150 -65 to 150 2000
W /W mW /W V
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Note 2: Maximum package power dissipation limits must be observed.
Recommended Operating Conditions
Parameter Supply Voltage Ambient Temperature
Symbol VCC TA
Min 3 -40
Max 36 85
Unit V
o
C
Apr. 2005 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet 0.8A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER Electrical Characteristics
(VCC = 5.0 V, TA = -40 to 85oC, unless otherwise specified.)
AZ34063C
Parameter OSCILLATOR Frequency
Symbol fOSC
Conditions VPin 5 = 0 V, TA = 25oC CT = 1.0 nF CT = 330 pF
o
Min 30 75 30 180 5.2 250
Typ 38 88 38 240 6.5 300 1.0 0.45
Max 45 100 45 290 7.5 350 1.3 0.8
Unit KHz KHz A A
Charge Current Discharge Current Discharge to Current Ratio Current Limit
ICHG IDISCHG
VCC = 5.0 V to 36 V, TA = 25oC VCC = 5.0 V to 36 V, TA = 25 C
Charge IDISCHG/ICHG Pin 7 to V , T = 25oC CC A Sense VIPK(sense) VCE(sat) VCE(sat) hFE IC(off) VTH Line REGLINE IIB ICC ICHG = IDISCHG, TA = 25oC ISW = 0.8 A, Pins 1, 8 connected ISW = 0.8 A, RPin 8 = 82 to VCC, Forced = 20 ISW = 0.8 A, VCE = 5.0 V, VCE = 36 V TA = 25oC TA = -40 to 85oC VCC = 3.0 V to 36 V VIN = 0 V VCC = 5.0 V to 36 V, CT = 1.0 nF, Pin 7 = VCC, VPin 5 > VTH, Pin 2 = GND, other pins open
mV V V
OUTPUT SWITCH (Note 3) Saturation Voltage, Dalington Connection Saturation Voltage (Note 4) DC Current Gain Collector Off-State Current COMPARATOR Threshold Voltage 1.225 1.250 1.275 1.21 1.4 -20 1.29 5 -400 4 mV nA mA V
50
75 0.01 100 A
Threshold Voltage Regulation Input Bias Current TOTAL DEVICE Supply Current
Note 3: Low duty cycle pulse technique are used during test to maintain junction temperature as close to ambient temperature as possible. Note 4: If 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 2.0us 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. If a non-Darlington configuration is used, the following output drive condition is recommended:
Apr. 2005 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet 0.8A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER Electrical Characteristics (Continued)
Forced of output switch:
AZ34063C
IC output 10 IC driver - 7.0mA*
* The 100 resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.
Typical Performance Characteristics
Ton-off. Output Switch On-Off Time (s)
1000
ton toff
100
10
Vosc. Oscillator Voltage (V) 200mV/DIV
VCC=5.0V Pin 7=VCC Pin 5=GND O TA=25 C
1 0.1 1 10 100
VCC=5.0V Pin 7=VCC Pin 2=GND
Pin 1,5,8 = open CT=1.0nF TA=25oC Time. 10s/DIV
CT,Oscillator Timing Capacitor (nF)
Figure 4. Output Switch On-Off Time vs. Oscillator Timing Capacitor
Figure 5. Timing Capacitor Waveform
3.5
100
ICC. Supply Current (mA)
Frequency (KHz)
VCC=5.0V Pin 7=VCC Pin 5=GND O TA=25 C
3.0
2.5
10
2.0
1.5
CT=1.0nF Pin 7=VCC Pin 2=GND
1
1.0
0.1
1
10
100
0.5 0 5 10 15 20 25 30 35 40
CT,Oscillator Timing Capacitor (nF)
VCC. Supply Voltage (V)
Figure 6. Oscillator Frequency vs.Timing Capacitor
Figure 7. Standby Supply Current vs. Supply Voltage
Apr. 2005 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet 0.8A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER Typical Performance Characteristics (Continued) AZ34063C
1.65
1.2 1.1
1.60
1.0 0.9
Darlington Connection
Saturation Voltage (V)
Saturation Voltage (V)
1.55
0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0
1.50
1.45
1.40
VCC=5.0V Pins 1,7,8=VCC Pins 3,5=GND O TA=25 C
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1
Forced =20
VCC=5.0V Pin 7=VCC Pin 2,3,5=GND O TA=25 C
0.6 0.7 0.8 0.9 1.0
1.35 0.0
-0.1 0.0
0.1
0.2
0.3
0.4
0.5
Emitter Current (A)
Collector Current (A)
Figure 8. Emitter Follower Configuration Output Saturation Voltage vs. Emitter Current
Figure 9. Common Emitter Configuration Output Switch Saturation Voltage vs. Collector Current
300
Current Limit Sense Voltage (mV)
295 290 285 280 275 270 265 260 255 250 -60
-40
-20
0
20
40
60
O
80
100
120
140
Temperature ( C)
Figure 10. Current Limit Sense Voltage vs. Temperature
Apr. 2005 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet 0.8A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER Typical Applications
L1 220H
AZ34063C
R3 180
8
B A S R Q
1
7
Rsc 0.4 Ipk IPK OSC
2
D1 1N5819
CT
Vin 12V +
6
C1 100F 1.25V Reference Regulator
3
CT 1500p F
+ -
5
4
L2 1.0 Vout + Optional Filter
U1
AZ34063C Vout 28V/175mA + C2 330 F
R2 2.2k
R1 47k
C3 100 F
Figure 10. Step-Up Converter (Note 5) Note 5: This is a typical step-up converter configuration. In the steady state, if the resistor divider voltage at pin 5 is greater than the voltage in the non-inverting input, which is 1.25V determined by the internal reference, the output of the comparator will go low. At the next swithching period, the output switch will not conduct and the output voltage will eventually drop below its nominal voltage until the divider voltage at pin 5 is lower than 1.25V. Then the output of the comparator will go high, the output switch will be allowed to conduct. Since Vpin5 = VOUT * R2/(R1+R2) = 1.25(V), the output voltage can be decided by VOUT = 1.25 * (R1+R2)/R2 (V).
Apr. 2005 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet 0.8A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER Typical Applications (Continued) AZ34063C
8
B A S R Q
1
7
Rsc 0.4 0.33 Ipk IPK OSC CT
2
D1 1N5819 L1 220H 220 H
Vin 25V +
6
C1 100F 1.25V Reference Regulator
3
CT 470 pF
+ -
5
4
L2 1.0 H Vout + Optional Filter
U1 AZ34063
R1 3.6k R2 1.2k
+
Vout 5V/500mA C2 470 F
C3 100 F
Figure 11. Step-Down converter (Note 6) Note 6: This is a typical step-down converter configuration. The working process in the steady state is similar to step-up converter, Vpin5 = VOUT * R2/(R1+R2) = 1.25 (V), the output voltage can be decided by VOUT = 1.25 * (R1+R2)/R2 (V).
Apr. 2005 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet 0.8A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER Typical Applications (Continued) AZ34063C
8
B A S R Q
1
7
Rsc 0.24 Ipk IPK OSC
2
L1 88
CT
Vin 4.5-6V +
6
C1 100 F 1.25V Reference Regulator
3
CT 1500pF
+ -
D1 1N5819
5
4
U1
AZ34063C
L2
1.0 Vout C3 100 F
R1 953 + R2 8.2k
Vout -12V/100mA + C2 1000 F Optional Filter
Figure 12. Voltage Inverting Converter (Note 7)
Note 7: This is a typical inverting converter configuration. The working process in the steady state is similar to step-up converter, the difference in this situation is that the voltage at the non-inverting pin of the comparator is equal to 1.25V+VOUT, then Vpin5 = VOUT * R2/(R1+R2) = 1.25V+VOUT, so the output voltage can be decided by VOUT = -1.25 * (R1+R2)/R1 (V).
Apr. 2005 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet 0.8A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER Mechanical Dimensions SOIC-8 Unit: mm(inch) AZ34063C
4.800(0.189) 5.000(0.197) 7 1.350(0.053) 1.750(0.069)
0.320(0.013)
8
7
8
0.675(0.027) 0.725(0.029)
D
5.800(0.228) 6.200(0.244)
D 20:1
1.270(0.050) TYP
0.100(0.004) 0.300(0.012) R0.150(0.006)
0.800(0.031)
0.200(0.008)
1.000(0.039) 3.800(0.150) 4.000(0.157)
0 8
0.330(0.013) 0.510(0.020) 0.900(0.035)
1 5
R0.150(0.006)
0.190(0.007) 0.250(0.010)
Apr. 2005 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet 0.8A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER Mechanical Dimensions (Continued) DIP-8 Unit: mm(inch) AZ34063C
0.700(0.028) 7.620(0.300)TYP 1.524(0.060) TYP
6
6
5
3.710(0.146) 4.310(0.170) 4
3.200(0.126) 3.600(0.142)
4
3.000(0.118) 3.600(0.142)
0.510(0.020)MIN
0.254(0.010)TYP 0.360(0.014) 0.560(0.022) 2.540(0.100) TYP 0.130(0.005)MIN
0.204(0.008) 0.360(0.014) 8.200(0.323) 9.400(0.370)
R0.750(0.030) 3.000(0.118) Depth 0.100(0.004) 0.200(0.008) 9.000(0.354) 9.400(0.370)
6.200(0.244) 6.600(0.260)
Apr. 2005 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or other rights nor the rights of others.

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