AMC DOC. #: AMC34063_C November 2002 AMC34063A ADD MICROTECH CORP. DC - DC CONVERTER CONTROL CIRCUITS DESCRIPTION FEATURES The AMC34063A is designed for the applications which require DC - DC converters. It can be operated in a wide input range from 3.0V to 40V and has the controlled duty cycle oscillator, driver and high current output switch. Also, With the internal temperature compensation circuit, the AMC34063A provides an internally trimmed precision 2% reference voltage of 1.25V. These features make the AMC34063A suitable for step-up, step-down and voltage-inverting applications. ! ! ! ! # # # # APPLICATIONS # # # # Wide Input Operating Range: 3.0V to 40V Output Switch Current up to 1.5A 100KHz operational Frequency Low Standby Current Internally trimmed 2% 1.25V Reference Voltage Adjustable Output Voltage Available in 8 Pin Plastic DIP and 8 Pin S.O Packages Direct pin-to-pin replacement for industrial product MC34063A. PACKAGE PIN OUT Chargers Adaptors Mother Board Scanner SC 1 8 DrC SE 2 7 ISEN Cap 3 6 VCC GND 4 5 VFB M PACKAGE (TOP VIEW) SC 1 8 DrC SE 2 7 ISEN Cap 3 6 VCC GND 4 5 VFB DM PACKAGE (TOP VIEW) TA (C) 0 to 70 M ORDER INFORMATION Plastic DIP 8-pin AMC34063AM Note: All surface-mount packages are available in Tape & Reel. AMC34063ADMT). Copyright 2002, ADD Microtech Corp. 1 DM Plastic SO-8 8-pin AMC34063ADM Append the letter "T" to part number (i.e. www.addmtek.com AMC34063A AMC DOC. #: AMC34063_C November DC - DC CONVERTER CONTROL CIRCUITS 2002 ABSOLUTE MAXIMUM RATINGS Power Supply Voltage (VCC) ...............................................................................................40V Operating Junction temperature (M, DM Packages) .................................................................... 150 C Storage Temperature Range .................................................................................. -65C to 150C Lead temperature (Soldering, 10 seconds) .............................................................................300C Note 1: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. THERMAL DATA M PACKAGE: Power dissipation (PD), TA = 25 C Thermal Resistance-Junction to Ambient, JA DM PACKAGE: Power dissipation (PD), TA = 25 C Thermal Resistance-Junction to Ambient, JA 1.31W 95C /W 757mW 165C /W BLOCK DIAGRAM SC 1 8 DrC Q2 Q S Q1 R 100 7 ISEN SE 2 CT Isen Oscillator Cap 3 6 VCC 1.25V Reference Gnd 4 5 VFB Pin Assignment Descriptions Pin 1 Pin 2 Pin 3 Pin 4 : SC : SE : Cap : GND - Switch Collector - Switch Emitter - Oscillator Timing Capacitor - Ground Copyright 2002, ADD Microtech Corp. Pin 8 Pin 7 Pin 6 Pin 5 2 : DrC : ISEN : VCC : VFB - Driver Collector - I Peak Sense - Power Supply - Comparator inverting input www.addmtek.com AMC34063A AMC DOC. #: AMC34063_C November DC - DC CONVERTER CONTROL CIRCUITS 2002 RECOMMENDED OPERATING CONDITIONS Recommended Operating Parameter Symbol Min. Typ. Max. VFB -0.3 to + 40 Comparator Input Voltage VC(switch) 40 Switch Collector Voltage V 40 Switch Emitter Voltage (VPin1=40V) E(switch) VCE(switch) 40 Switch Collector to Emitter Voltage VC(driver) 40 Driver Collector Voltage I 100 Driver Collector Current (Note 1) C(driver) ISW 1.5 Switch Current Timing Capacitor (connected to Cap pin) CT 1 Operating Ambient Temperature Range TA 0 to +70 Note 1: Maximum package power dissipation limits must be observed. ELECTRICAL CHARACTERISTICS Units V V V V V mA A nF C VCC=5.0 V, TA=0C to 70C, unless otherwise specified. Parameter OSCILLATOR Frequency Charge Current Discharge Current Discharge to Charge Current Ratio Current Limit Sense Voltage OUTPUT SWITCH Saturation Voltage, Darlington Connection Saturation Voltage Test Conditions fosc Ichg VPin 5 = 0 V, CT = 1.0 nF, TA = 25C VCC = 5.0 V to 40 V, TA = 25C VCC = 5.0 V to 40 V, TA = 25C Pin 7 to VCC, TA = 25C Ichg = Idischg, TA = 25C 24 24 140 5.2 250 33 35 220 6.5 300 42 42 260 7.5 350 KHz A A mV ISW = 1.0 A, Pins 1, 8 connected ISW = 1.0 A, Rpin 8 =82 to VCC, Forced = 20 ISW = 1.0 A, VCE = 5.0 V, TA = 25C VCE = 40 V - 1.0 1.3 V - 0.45 0.7 V 50 - 75 0.01 100 A Idischg Idischg/Ichg Vsense VCE(sat) VCE(sat) DC Current Gain Collector OffState Current COMPARATOR hFE IC(off) Threshold Voltage Vth Threshold Voltage Line Regulation Input Bias Current AMC34063A Min. Typ. Max. Symbol Regline IIB TA = 25C TA =0C to 70C VCC = 3.0 V to 40 V VFB = 0 V 1.225 1.25 1.275 1.21 1.29 1.4 5.0 -20 -400 Units V mV nA TOTAL DEVICE Supply current Copyright 2002, ADD Microtech Corp. ICC VCC = 5.0 V to 40 V, CT = 1.0nF, Pin 7 = VCC, VFB > Vth, Pin 2= GND, remaining pins open 3 - - 4.0 mA www.addmtek.com AMC34063A AMC DOC. #: AMC34063_C November DC - DC CONVERTER CONTROL CIRCUITS 2002 CHARACTERIZATION CURVES VCC = 25V, 500mA load CT = 470pF VCC = 5V, Pin 1, 5, 8 open CT = 1nF 23.3V - 0.8V SE pin (PIN#2) waveform Cap pin (PIN#3) waveform on 5V step down converter VCC = 5V, Pin 1, 5, 8 open CT = 1nF VCC = 5V, Pin 1, 5, 8 open CT = 1nF Cap pin (PIN#3) waveform Cap pin (PIN#3) waveform Copyright 2002, ADD Microtech Corp. 4 www.addmtek.com AMC34063A AMC DOC. #: AMC34063_C November DC - DC CONVERTER CONTROL CIRCUITS 2002 Figure 1 - Step-Up Converter Application Circuits 170uH L 180 1 8 Q2 Q S Q1 R 7 2 CT Rsc 0.22 Isen Oscillator V IN 12V 6 3 1.25V Reference 100uF 1500pF 4 5 VOUT 28V/175mA Co 47K R2 R1 2.2K 330uF Figure 2 - Step-Down Converter Application Circuit 1 8 Q2 Q S Q1 R 7 2 L 220uH 1N5819 CT Rsc 0.33 Isen Oscillator V IN 25V 6 3 1.25V Reference 100uF 470pF 4 5 VOUT 5V/500mA Co Copyright 2002, ADD Microtech Corp. 3.6K R2 R1 1.2K 470uF 5 www.addmtek.com AMC34063A AMC DOC. #: AMC34063_C November DC - DC CONVERTER CONTROL CIRCUITS 2002 Figure 3 - Voltage Inverting Converters 1 8 Q2 S Q Q1 R 7 2 L 88uH 1N5819 CT Rsc 0.24 Ipk Oscillator V IN 4.5V to 6.0V 6 3 1.25V Reference 1500pF 100uF 4 5 V OUT -12V/100mA 953 3.6K Co R2 1000uF R1 1.2K 8.2K Note: For step-up, step-down or voltage inverting applications requiring peak current greater than 1.5A, external boost current circuitry by NPN or PNP transistors can be used. Copyright 2002, ADD Microtech Corp. 6 www.addmtek.com AMC34063A AMC DOC. #: AMC34063_C November DC - DC CONVERTER CONTROL CIRCUITS 2002 Typical Design Reference Table: Calculation Step-Down Step-Up Voltage-Inverting ton/toff Vout + VF Vin(min) - Vsat- Vout Vout + VF - Vin(min) Vin(min) - Vsat !Vout! + VF Vin - Vsat ton + toff 1 f 1 f 1 f toff ton + toff ton/toff + 1 ton + toff ton/toff + 1 ton + toff ton/toff + 1 ton (ton + toff) - toff (ton + toff) - toff (ton + toff) - toff CT 4.0 x 10 ton 4.0 x 10 ton 4.0 x 10 ton Ipk(switch) 2Iout(max) 2Iout(max) (ton/toff + 1) 2Iout(max) (ton/toff + 1) RSC 0.3/Ipk(switch) 0.3/Ipk(switch) 0.3/Ipk(switch) L(min) CO -5 ( (V in(min) - Vsat- Vout) Ipk(switch) -5 )t on(max) ( (V I in(min) - Vsat) pk(switch) Ipk(switch)( ton + toff) 8Vripple(pp) 9 -5 )t on(max) ( (V I in(min) - Vsat) pk(switch) Iout ton Vripple(pp) 9 )t on(max) Iout ton Vripple(pp) VF: Forward Voltage drop of the output rectifier Vsat: Saturation voltage of the output switch. The following power supply characteristics must be chosen: Vin - Nominal input voltage Vout - Desired output voltage, !Vout! = 1.25(1 + R1/R2) Iout - Desired output current. fmin - Minimum desired output switching frequency at the selected values of Vin and IO Vripple(pp) - Desired peak - to - peak output ripple voltage. Application concerns: To get the best regulation performance, Low ESR capacitors at Vout are suggested. Copyright 2002, ADD Microtech Corp. 7 www.addmtek.com AMC34063A AMC DOC. #: AMC34063_C November DC - DC CONVERTER CONTROL CIRCUITS 2002 8-Pin Plastic DIP 5 8 B 1 MIN 4 A L F C J K H G MILLIMETERS INCHES M D TYP MAX MIN TYP MAX A 0.355 0.365 0.400 9.02 9.27 10.16 B 0.240 0.250 0.280 6.10 6.35 7.11 C - - 0.210 - - 5.33 D - 0.018 - - 0.46 - F - 0.060 - - 1.52 - G - 0.100 - - 2.54 - H 0.050 - 0.090 1.27 - 2.29 - J 0.008 0.015 0.20 - 0.38 K 0.115 0.130 0.150 2.92 3.30 3.81 L 0.300 BSC. M - 7 7.62 BSC. 15 - 7 15 Note: For 8-pin Plastic package, 60 units per tube 8-Pin Plastic S.O.I.C. B P F D G MIN TYP MAX MIN TYP MAX A 0.183 - 0.202 4.65 - 5.13 B 0.144 - 0.163 3.66 - 4.14 C 0.068 - 0.074 1.73 - 1.88 D 0.010 - 0.020 0.25 - 0.51 F - 0.035 0.38 - 0.89 0.015 G L C SEATING PLANE SEATING PLAN MILLIMETERS INCHES A K Copyright 2002, ADD Microtech Corp. M J 8 0.050 BSC 1.27 BSC J 0.007 - 0.010 0.19 - 0.25 K 0.005 - 0.010 0.13 - 0.25 L 0.189 - 0.205 4.80 - 5.21 M - - 8 - - 8 P 0.228 - 0.244 5.79 - 6.20 www.addmtek.com AMC34063A AMC DOC. #: AMC34063_C November 2002 DC - DC CONVERTER CONTROL CIRCUITS IMPORTANT NOTICE ADD Microtech (ADDM) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. ADDM integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of ADDM products in such applications is understood to be fully at the risk of the customer. In order to minimize risks associated with the customer's applications, the customer should provide adequate design and operating safeguards. ADDM assumes to no liability to customer product design or application support. ADDM warrants the performance of its products to the specifications applicable at the time of sale. U.S. Asia Pacific ADD Microtech Inc. 492 Altamont Drive Milpitas, CA 95035 ADD Microtech Corp 3F, 132, Sec. 4, Chung Hsiao E. Rd., Taipei, Taiwan T E L : (408) 9410420 FA X : (408) 9410864 T E L : 2-27760166 FA X : 2-27764208 Copyright 2002, ADD Microtech Corp. 9 www.addmtek.com