BM34063 DC-DC CONVERTER Features Description z z z z z z z z The BM34063 Series 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. 3V to 40V Input Voltage Operation Internal 1.6A Peak Current Switch Internal ±1.8% Reference Low Quiescent Current at 1.6mA Frequency Operation from 100Hz~100KHz Output Voltage Adjustable Active Current Limiting Step-Up, Step-Down or Inverting Switching Regulators Pin Assignment DIP/SOP-8 1 SWC DRC 8 2 SWE Ipk 7 3 TC VCC 6 4 GND FB 5 Pin1: Switch Collector (SWC) Pin5: Comparator Inverting Input (FB) Pin2: Switch Emitter (SWE) Pin6: Voltage Supply (Vcc) Pin3: Timing Capacitor (TC) Pin7: Ipk Sense (Ipk) Pin4: Ground (GND) Pin8: Voltage Driver Collector (DRC) Ordering Information Part Number BM34063HP BM34063HS 2004/06/15 Package DIP-8 SOP-8 1 BM34063 DC-DC CONVERTER Absolute Maximum Ratings (Ta=25°C, Unles Otherwise Specified) Parameter Symbol Value Unit Power Supply Voltage VCC 40 V Comparator Input Voltage Range Vir -0.3~+40 V Switch Collector Voltage VC(SW) 40 V Switch Emitter Voltage VSWE 40 V Switch Emitter to Collector Voltage VCE 40 V VC(DR) 40 V Switch Current ISW 1.5 A Power Dissipation at Ta=25oC PD Operating Ambient Temperature Range Topr Driver Collector Voltage Storage Temperature Range DIP-8 1 SO-8 0.625 Tstg Operating Junction Temperature Topj Thermal Resistance Junction-ambient θJA W 0~+70 o -65~+150 o 120 o C C C o 125 C/W Block Diagram DRI SC Pin8: Driver Collector Pin1: 1.6A Switch Collector Q Q2 Q1 S R 80Ω IPK SE Pin2: Darlington Switch Emitter IPK CT Pin7: Highside Current Sense Input, VCC-VIPK=300mV Oscillator VCC TC Comparator Pin3: Oscilletor Timing Capacitor 1.25V Reference Voltage GND Pin4: Power GND 2004/06/15 Pin6: Power Supply Input + FB Pin5: Feedback Comparator Inverting Input 2 BM34063 DC-DC CONVERTER Electrical Characteristics (VCC=5V,Ta=0~70°C, unless otherwise specified) Parameter Symbol Test Condition Min. Typ. Max. Unit 10 25 40 uA 140 190 240 uA 28 33 40 KHz 5.2 6 7.5 250 300 350 mV Oscillator Charging Current Ichg Discharge Current Idischg Frequency fOSC Discharge to Charge Current Ratio Idischg/Ichg Current Limit Sense Voltage VIPK VCC=5~40V, Ta=25oC o VCC=5~40V, Ta=25 C o VPIN5=0, CT=1nF, Ta=25 C o VPIN7=VCC, Ta=25 C o Idischg=Ichg, Ta=25 C Output Switch Saturation Voltage, Darlington Connection Saturation Voltage VCE(sat) 1 ISW=1A, VC(SW)=VC(DR) - 1 1.3 V VCE(sat) 2 ISW=1A, IC(DR)=50mA - 0.4 0.7 V 35 120 - - 10 100 uA 1.23 1.25 1.27 V VCC=5~40V - 1.5 6 mV IIB VIN=0V - 40 400 nA ICC VCC=5~40V, VPIN7=VCC, VPin5>VFB, CT=0.001uF, Pin7=GND, Remaining pins open - 1.6 3 mA DC Current Gain hFE Collector Off-State Current ICC(off) ISW=1A, VCE=5V o VCE=40V, Ta=25 C Comparator Threshold Voltage VFB Threshold Voltage Line Regulation Input Bias Current ∆VFB Total Device Supply Current Application Information Design Formula 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(max)-Vsat) (ton+toff) max 1/Fmin 1/Fmin 1/Fmin -5 -5 CT 4*10 ton 4*10 ton 4*10-5ton IC(sw) 2*Iout(max) 2*Iout(max)(ton+toff/toff) 2*Iout(max)(ton+toff/toff) RS 0.3/IC(sw) 0.3/IC(sw) 0.3/IC(sw) L(min) (Vin(min)-Vsat/Ipk(sw))*ton(max) (Vin(min)-Vsat/Ipk(sw))*ton(max) (Vin(min)-Vsat/Ipk(sw))*ton(max) CO (Ipk(sw)*(ton+toff))/(8*Vripple(P-P)) Iout*ton/Vripple(P-P) Iout*ton/Vripple(P-P) Vsat: Saturation voltage of the output switch. VF: Forward voltage drop of the ringback rectifier. The following power supply characteristics must be chosen: Vin: Nominal input voltage. Vout: Desired output voltage. |Vout|=1.25*(1+RB/RA) Iout: Desired output current Fmin: Minimum desired output switching frequency at the selected values for Vin and Iout. Vripple(P-P): Desired peak to peak output ripple voltage in practice, the calculated value will need to be increased due to the capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly effect the line and load regulation. 2004/06/15 3 BM34063 DC-DC CONVERTER Application Information (Continued) D1 L1 200uH R1 1N5819 BM34063 150Ω RSC 0.22 Vin C1 8 1 7 2 6 3 5 4 Vout 28V / 200mA Cout 220uF CT 680pF 100uF RB RA Line Regulation: 100mV (Vin=8V~16V, @Io=200mA) Load Regulation: 5mV (Vin=12V, @Io=80mA~200mA) 47kΩ 2.2kΩ Fig.2 Step-Up Converter L1 BM34063 R1 RSC Vin 8 1 7 2 6 3 5 4 Vout D1 Q1 C1 CT Cout R2 RB RA Fig.3 Step-Up Converter With External NPN Switch L1 BM34063 RSC 0.25 8 1 7 2 6 3 5 Vin 200uH Vout 5V / 500mA Cout D1 4 470uF 1N5819 CT 470pF RB C1 100uF RA 1.2kΩ 3.6kΩ Line Regulation: 40mV (Vin=10V~20V, @Io=500mA) Load Regulation: 5mV (Vin=15V, @Io=10mA~500mA) Short Circuit Current: 1.3A (Vin=15V, @RL=0.1Ω Fig.4 Step-Down Converter 2004/06/15 4 BM34063 DC-DC CONVERTER BM34063 R2 RSC Vin 8 1 7 2 6 3 5 4 R1 Q1 L1 Vout CT D1 Cout RB C1 RA Fig.5 Step-Down Converter With External PNP Saturation Switch D1 Vout -12V / 100mA BM34063 RSC 0.25 Vin 4.5V-6V 8 1 7 2 6 3 4 5 1N5819 L1 Cout 100uH 470uF CT 680pF RA C1 100uF RB 953Ω 8.2kΩ Line Regulation: 20mV (Vin=4.5V~6V, @Io=100mA) Load Regulation: 100mV (Vin=5V, @Io=10mA~100mA) Fig.6 Voltage Inverting Converter BM34063 RSC Vin 8 1 7 2 6 3 5 4 R2 R1 Q1 L1 D1 CT RA Vout C1 RB Cout Fig.7 Voltage Inverting Converter With External PNP Saturation Switch 2004/06/15 5 BM34063 DC-DC CONVERTER DIP-8 (P) Dimension 6 7 8 DIM A B C D E F G H I J K L M α1 5 A 1 2 4 3 B J F E C α1 K G Min. 6.29 9.22 3.25 3.17 0.38 2.28 7.49 8.56 0.229 o 94 Max. 6.40 9.32 *1.52 *1.27 *0.99 3.35 3.55 0.53 2.79 7.74 *3.00 8.81 0.381 o 97 *: Typical, Unit: mm D I M H L 8-Lead DIP-8 Plastic Package SOP-8 (S) Dimension A 7 8 B G 6 C Pin1 Index 2 3 I 5 H 4 J D K E Part A Part A M L N O DIM A B C D E F G H I J K L M N O Min. 4.85 3.85 5.80 1.22 0.37 3.74 1.45 4.80 0.05 0.30 0.19 0.37 0.23 0.08 0.00 Max. 5.10 3.95 6.20 1.32 0.47 3.88 1.65 5.10 0.20 0.70 0.25 0.52 0.28 0.13 0.15 *: Typical, Unit: mm F 8-Lead SO-8 Plastic Surface Mounted Package 2004/06/15 6 BM34063 DC-DC CONVERTER Soldering Methods 1. Storage environment: Temperature=10oC~35oC Humidity=65%±15% 2. Reflow soldering of surface-mount devices Figure 1: Temperature profile tP Critical Zone TL to TP TP Ramp-up TL tL Temperature Tsmax Tsmin tS Preheat Ramp-down 25 t 25oC to Peak Time Profile Feature Sn-Pb Eutectic Assembly Pb-Free Assembly <3 C/sec <3oC/sec 100oC 150oC 60~120 sec 150oC 200oC 60~180 sec <3oC/sec <3oC/sec Time maintained above: - Temperature (TL) - Time (tL) 183oC 60~150 sec 217oC 60~150 sec Peak Temperature (TP) 240oC +0/-5oC 260oC +0/-5oC Time within 5 C of actual Peak Temperature (tP) 10~30 sec 20~40 sec Ramp-down Rate <6oC/sec <6oC/sec <6 minutes <8 minutes Peak temperature Dipping time 245 C ±5 C 5sec ±1sec Average ramp-up rate (TL to TP) Preheat - Temperature Min (Tsmin) - Temperature Max (Tsmax) - Time (min to max) (ts) Tsmax to TL - Ramp-up Rate o o Time 25oC to Peak Temperature 3. Flow (wave) soldering (solder dipping) Products Pb devices. Pb-Free devices. 2004/06/15 o o o o 260 C +0/-5 C 5sec ±1sec 7