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2011, February, Rev. 02 DC-TO-DC CONVERTER CONTROL CIRCUITS The IL34063A is a monolithic control circuit containing the primary functions required for DC -to-DC converters. These devices consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This series was specifically designed to be incorporated in Step -Down and Step-Up and Voltage-Inverting applications with a minimum number of external components.

FEATURES

  • Operation from 3.0 V to 40 V Input
  • Low Standby Current
  • Current Limiting
  • Output Switch Current to 1.5 A
  • Output Voltage Adjustable
  • Frequency Operation to 100 kHz
  • Precision 2% Reference MAXIMUM RATINGS Rating Symbol Value Unit Power Supply Voltage VCC 40 Vdc Comparator Input Voltage Range VIR -0.3 to +40 Vdc Switch Collector Voltage VC(switch) 40 Vdc Switch Emitter Voltage (Vpin 1 = 40 V) VE(switch) 40 Vdc Switch Collector to Emitter Voltage VCE(switch) 40 Vdc Driver Collector Voltage IC(driver) 40 Vdc Driver Collector Current (Note 1) IC(driver) 100 mA Switch Current ISW 1.5 A Power Dissipation and Thermal Characteristics Ceramic Package, U Suffix TA = +25°C Thermal Resistance Plastic Package, P Suffix TA = +25°C Thermal Resistance TA = +25°C Thermal Resistance PD RθJA PD RθJA PD RθJA 1.25 100 1.25 100 625 160 W °C/W W °C/W mW °C/W Operating Junction Temperature TJ +150 °C Operating Ambient Temperature Range TA 0 to +70 °C Storage Temperature Range Tstg -65to+150 °C * Stresses beyond 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-rated conditions for extended periods may affect device reliability. IL34063A

2011, February, Rev. 02

ORDERING INFORMATION

Device Temperature Range Package 34063AD 0° to +70°C SO-8 34063AN Plastic DIP CC = 5.0 V, TA= 0 to +70oC unless otherwise specified.) ELECTRICAL CHARACTERICISTICS Characteristics Symbol Min Typ Max Unit OSCILLATOR Frequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C) fosc 24 33 42 kHz Charge Current (VCC = 5.0 V to 40 V, TA = 25°C) Ichg 24 33 42 µA Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C) Idischg 140 200 260 µA Discharge to Charge Current Ratio (Pin7 to Vcc, TA=25°C) Idischg/Ichg 5.2 6.2 7.5 — Current Limit Sense Voltage (Ichg = Idischg, TA = 25°C) Vipk(sense) 250 300 350 mV OUTPUT SWITCH (Note 3) Saturation Voltage, Darlington Connection (ISW = 1.0 A, Pins 1, 8 connected) VCE(sat) — 1.0 1.3 V Saturation Voltage (ISW = 1.0 A, RPin 8 = 82 Ω to VCC. Forced β = 20) VCE(sat) — 0.45 0.7 V DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C) hFE 50 120 — — Collector Off-State Current (VCE = 40V) IC(off) — 0.01 100 µA COMPARATOR Threshold Voltage (TA = 25°C) (TA = TLOW to THIGH) Vth 1.225 1.21 1.25 1.275 1.29 V Threshold Voltage (TA = 25°C) ** Vth 1.2375 1.25 1.2625 V Threshold Voltage Line Regulation (VCC = 3 0 V to 40 V) Regline 1.4 5.0 mV Input Bias Current (Vin=0V) IIB — -40 -400 nA TOTAL DEVICE Supply Current (VCC = 5 0 V to 40 V, CT = 1 0 nF, Vpin7 = VCC. VPin5 > Vth, Pin 2 = Gnd, Remaining pins open) ICC 2.5 4.0 mA NOTES: 1. Maximum package power dissipation limits must be observed. 2. Low duty cycle pulse techniques are used during test to maintain Junction temperature as close to ambient temperature as possible 3. If the output switch is driven into hard saturation (non Darlington configuration) at low switch currents (< 300 mA) and high driver currents (>30 mA), it may take up to 2.0 µs to come out of saturation This condition will shorten the off' time at frequencies > 30 kHz, and is magnified at high temperatures This condition does not occur with a Darlington confi guration, since the output switch cannot saturate If a non Darlington configuration is used, the following output drive condition is recommended Forced β of output switch = IC, output/(Ic, driver -7.0 mA*) > 10 *The 100 Ω. resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts **Possible version for shipment Pin connection

2011, February, Rev. 02 TYPICAL APPLICATION CIRCUITS Step-Up Converter Test Condition (V OUT = 28 V) Test Conditions Value (Typ) Unit Line Regulation VIN = 8 to 16 V, IO = 175 mA 30 mV Load Regulation VIN = 12 V, IO = 75 to 175 mA 10 mV Output Ripple VIN = 12 V, IO = 175 mA 300 mV Efficiency VIN = 12 V, IO = 175 mA 89 % DRC 170µH Ipk Vcc Cll SWC SWE TC GND RSG R1 R2 180Ω 0.22Ω +C2 100 µF 2.2kΩ 47kΩ 1.5nF VOUT +C3 330µF VIN 12V 34063A/E BYV10-40

2011, February, Rev. 02 Step-Down Converter Test Condition (V OUT = 5 V) Test Conditions Value (Typ) Unit Line Regulation VIN = 15 to 25 V, IO = 500 mA 5 mV Load Regulation VIN = 25 V, IO = 50 to 500 mA 30 mV Output Ripple VIN = 25 V, IO = 500 mA 100 mV Efficiency VIN = 25 V, IO = 500 mA 80 % ISC VIN = 25 V, RLOAD = 0.1 Ω 1.2 A DRC Ipk Vcc Cll SWC SWE TC GND 34063A/E RSC 0.33Ω +C2 100 µF R1 R2 1.2kΩ 3.6kΩ +C1 470µF 470pF 220µH BYV10-40

2011, February, Rev. 02 Voltage Inverting Converter Test Condition (V OUT = -12 V) Test Conditions Value (Typ) Unit Line Regulation VIN = 4.5 to 6 V, IO = 100 mA 15 mV Load Regulation VIN = 5 V, IO = 10 to 100 mA 20 mV Output Ripple VIN = 5 V, IO = 100 mA 230 mV Efficiency VIN = 5 V, IO = 100 mA 58 % ISC VIN = 5 V, RLOAD = 0.1 Ω 0.9 A DRC Ipk Vcc Cll SWC SWE TC GND 0.22Ω VIN 4.5 to 6V +C2 100µF R2 R1 8.2kΩ 953Ω 1000µF 1.5nF BYV10-40 90µH 34063A/E VOUT -12V / 100mA

2011, February, Rev. 02 Calculation Parameter Step-Up (Discontinuous mode) Step-Down (Continuous mode) Voltage Inverting (Discontinuous mode) ton/toff Vout +VF-V in(min) Vout +VF Vout + VF Vin(min) - Vsat Vin(min) - Vsat - Vout Vin - Vsat (ton + toff)max 1/fmin 1/fmin 1/fmin CT 4.5x10-5ton 4.5x10-5ton 4.5x10-5ton IPK(switch) 2Iout(max)[(ton/toff)+1] 2Iout(max) 2Iout(max)[(ton/toff)+1] RSC 0.3/IPK(switch) 0.3/IPK(switch) 0.3/IPK(switch) CO ≡ Ioutton IPK(switch) (ton + toff) ≡ Ioutton Vripple(p-p) 8Vripple(p-p) Vripple(p-p) L(min) Vin(min) - Vsat ton(max) Vin(min)-Vsat-Vout ton(max) Vin(min) - Vsat ton(max) IPK(switch) IPK(switch) IPK(switch) NOTES: Vsat = Saturation voltage of the output switch VF = Forward voltage drop of the output rectifier THE FOLLOWING POWER SUPPLY CHARACTERISTICS MUST BE CHOSEN: Vin = Nominal input voltage Vout = Desired output voltage, Vout  = 1.25(1+R2/R1) Iout = Desired output current fmin = Minimum desired output switching frequency at the selected values of Vin and lo Vripple = Desired peak to peak output ripple voltage. In practice, the calculated capacitor value will and to be increased due to its equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and load regulation. Step-up With External NPN Switch VOUT RSC VIN S R Q Ipk Oscillator 1.25V Reference Regulator Comparator

2011, February, Rev. 02 Step-down With External NPN Switch S R Q Q2 Ipk Oscillator 1.25 V Reforence Regulator Comparator VIN RSC VOUT Step-down With External PNP Switch S R Q Q2 Ipk Oscillator 1.25 V Reference Regulator Comparator VIN RSC VOUT

2011, February, Rev. 02 Voltage Inverting With External NPN Switch S R Q Q2 Ipk Oscillator 1.25 V Reference Regulator Comparator VIN RSC VOUT Voltage Inverting With External PNP Saturated Switch S R Q Q2 Ipk O scillator 1.25 V Reforence Regulator Comparator VIN RSC VOUT

2011, February, Rev. 02 Dual Output Voltage S R Q Q2 Ipk Oscillator 1.25 V Reforence Regulator Comparator VIN RSC +12V GND -12V Higher Output Power, Higher Input Voltage S R Q Q2 Ipk Oscillator 1.25 V Reforence Regulator Comparator RSC +VOUT -VOUT Isolated from input VIN

2011, February, Rev. 02 N SUFFIX PLASTIC DIP (M S – 001BA) Symbol MIN MAX A 8.51 10.16 B 6.1 7.11 C 5.33 D 0.36 0.56 F 1.14 1.78 G H J 0° 10° K 2.92 3.81 NO TES : L 7.62 8.26 1. Dim ensions “A”, “B” do not include m old flash or protrusions. M 0.2 0.36 Max im um m old flash or protrusions 0.25 m m (0.010) per side. N 0.38 D S UFFIX S OIC (M S - 012AA) Symbol MIN MAX A 4.8 5 B 3.8 4 C 1.35 1.75 D 0.33 0.51 F 0.4 1.27 G H J 0° 8° NO TES : K 0.1 0.25 1. Dim ensions A and B do not include m old flash or protrusion. M 0.19 0.25 1.27 5.72 Dimens ion, mm Dimens ion, mm 2.54 7.62 A BH C K C M J F M P G D R x 45 SEA TING PLANE 0.25 (0.010) M T -T- L H M J A B F G D SEATI NG PLANE N K 0.25 (0.010) M T -T- C