SEAWARD DC-to-DC Converter Control Circuit ELECTRONICS INC. S E3 4 0 6 3 DESCRIPTION The SE34063 is a monolithic control circuit containing the primary functions required for DC-to-DC converter. The device consists of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This was specifically designed to be incorporated in Step-up, and Step-down and Voltage-Inverting applications with a minimum number of external components. FEATURES ¾ Operation from 3.0V to 35V input ¾ Dip-8 Packages ¾ Low Standby Current ¾ Output Switch Current to 1.5A ¾ Output Voltage Adjustable ¾ Frequency Operation to 100KHz ¾ Precision 2% Reference PIN CONFIGURATIONS BLOCK DIAGRAM APPLICATION ¾ Battery charges ¾ Power supply adapter ¾ DC-to-DC converter, such as 12 to 5V. DIP-8 (Top View) 1 SC 8 DRIC SE 2 7 Ipk TC 3 6 Vcc GND 4 Drive 8 Collector S Q R Ipk 7 Sense 1 Switch Collector 2 Switch Emitter Ipk Vcc 6 CT Oscillator 3 Timing Capacitor Comparator 5 CII + - DIP-8 1.25V Reference Regulator Comparator 5 Inverting Input 4 Gnd SOP-8 SC 1 8 DRIC SE 2 7 Ipk TC 3 6 Vcc GND 4 5 CII SOP-8 Preliminary and all contents are subject to change without prior notice. Tel: 0086-(010)82895705, 82895706 http:// www.seawardinc.com.cn Room1605, Building1, International Pioneering Park, No.1 Shangdi XinXi Road, Haidian District, Beijing 100085, China ©2001SEAWARD ELECTRONICS INC. 1/5 SEAWARD ELECTRONICS INC. DC-to-DC Converter Control Circuit S E3 4 0 6 3 Absolute Maximum Ratings z Power Supply Voltage -------------------------------------------------------------------------------- 35V z Comparator Input Voltage Range ------------------------------------------------------------------- -0.3 to +35V z Switch Collector Voltage ----------------------------------------------------------------------------- 35V z Switch Emitter Voltage (Vpin1=35V) -------------------------------------------------------------- 35V z Switch Collector to Emitter Voltage ---------------------------------------------------------------- 35V z Driver Collector Voltage ----------------------------------------------------------------------------- 35V z Driver Collector Current ----------------------------------------------------------------------------- 100mA z Switch Current ----------------------------------------------------------------------------------------- 1.5A z Power Dissipation and Thermal Characteristics Plastic Package TA = 25℃ ------------------------------------------------------------------------------------------- 1.25W Thermal Resistance --------------------------------------------------------------------------------- 100℃/W z Operating Junction Temperature --------------------------------------------------------------------- +150℃ z Operating Ambient Temperature Range ----------------------------------------------------------- 0 to +70℃ z Storage Temperature Range ------------------------------------------------------------------------- -65 to +150℃ Electrical Characteristics (Vcc=5.0V, TA=25℃, CT=1nF, unless otherwise specified.) Parameter Symbol Test Conditions Min Typ Max 1.25V Reference Reference Voltage Vref Vcc=5V-25V 1.225 1.25 1.275 Comparator Threshold Voltage Vth 1.225 1.25 1.275 Output Switch (Note) Saturation Voltage, Vce(sat) Isw=1.0A, Pin1, 8 connected 1.0 1.3 Darlington Connection Isw=1.0A, Rpin8=82Ω to Vcc, Saturation Voltage, 0.45 0.7 Vce(sat) Forced β=20 Darlington Connection DC Current Gain Hfe Isw=1.0A, Vce=5.0V 50 75 Collector Off-State Current Ic(off) Vce=35V 0.01 100 Oscillator Frequency fosc Vpin5=0V 24 33 42 Charge Current Ichg Vcc=5.0v to 35V 24 35 42 Discharge Current Idischg Vcc=5.0v to 35V 140 220 260 Discharge to Charge Current Ratio Idischg/Ichg Pin7 to Vcc 5.2 6.5 7.5 Vipk(sence) Current Limit Sense Voltage Ichg=Idischg 250 300 350 Total Device (Vcc=5 to 35V, Pin7=Vcc, Vpin5>Vth, 4.0 Supply Current Icc Pin2=GND, the others open) Note: Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. Units V V V V μA kHz μA μA mV mA Preliminary and all contents are subject to change without prior notice. Tel: 0086-(010)82895705, 82895706 http:// www.seawardinc.com.cn Room1605, Building1, International Pioneering Park, No.1 Shangdi XinXi Road, Haidian District, Beijing 100085, China ©2001SEAWARD ELECTRONICS INC. 2/5 SEAWARD DC-to-DC Converter Control Circuit ELECTRONICS INC. S E3 4 0 6 3 TYPICAL APPLICATION CIRCUIT Step-Up Converter Parameter Test Conditions Line Regulation Vin=8V to 16V, Io=175mA Load Regulation Vin=12V, Io=75mA to 175mA Output Ripple Vin=12V, Io=175mA Efficiency Vin=12V, Io=175mA Output Ripple with Optional Filter Vin=12V, Io=175mA Type Unit 30±0.05% mV 10±0.017% mV 400 mVp-p 87.7% - 40 mVp-p CIRCUIT L 170uH 1 8 180 S Q R 2 7 Ipk 0.22 CT Oscillator 6 Vin=12V 3 Comparator 100u + - IN5819 CT 1.25V Reference Regulator 5 1500PF 4 1.0uH Vout R1 2.2K R2 47K 330u Co 28V/175mA Vout 100u (Optional Filter) Step-Down Converter Parameter Test Conditions Type Unit Line Regulation Vin=15V to 25V, Io=500mA 12±0.12% mV Load Regulation Vin=25V, Io=50mA to 500mA 3.0±0.03% mV Output Ripple Vin=25V, Io=500mA 120 mVp-p Efficiency Vin=25V, Io=500mA 83.7% - Short Circuit Current Vin=25V, RL=0.1Ω 1.1 A Output Ripple with Optional Filter Vin=25V, Io=500mA 40 mVp-p Preliminary and all contents are subject to change without prior notice. Tel: 0086-(010)82895705, 82895706 http:// www.seawardinc.com.cn Room1605, Building1, International Pioneering Park, No.1 Shangdi XinXi Road, Haidian District, Beijing 100085, China ©2001SEAWARD ELECTRONICS INC. 3/5 SEAWARD DC-to-DC Converter Control Circuit ELECTRONICS INC. S E3 4 0 6 3 CIRCUIT 1 8 S Q R 2 7 IN5819 Ipk 0.33 CT Oscillator 6 Vin=25V L 220uH 3 CT Comparator 100u 1.25V Reference Regulator + - 470pF 5 4 1.0uH Vout R2 3.6K R1 1.2K Co 470u 5V/500mA Vout 100u (Optional Filter) Voltage Inverting Converter Parameter Test Conditions Type Unit Line Regulation Vin=4.5V to 6.0V, Io=100mA 3.0±0.012% mV Load Regulation Vin=5V, Io=10mA to 100mA 0.022±0.09% mV Output Ripple Vin=5V, Io=100mA 500 mVp-p Efficiency Vin=5V, Io=100mA 62.2% - Short Circuit Current Vin=5V, RL=0.1Ω 0.91 A Output Ripple with Optional Filter Vin=5V, Io=100mA 70 mVp-p CIRCUIT 1 8 S Q R 2 7 Ipk 0.24 6 Vin=4.5V~6V 88uH CT Oscillator + 5 IN5819 CT Comparator 100u L 3 1.25V Reference Regulator 1500pF 4 1.0uH Vout R1 8.2K R2 953 1000u Co -12V/100mA Vout 100u (Optional Filter) Preliminary and all contents are subject to change without prior notice. Tel: 0086-(010)82895705, 82895706 http:// www.seawardinc.com.cn Room1605, Building1, International Pioneering Park, No.1 Shangdi XinXi Road, Haidian District, Beijing 100085, China ©2001SEAWARD ELECTRONICS INC. 4/5 SEAWARD DC-to-DC Converter Control Circuit ELECTRONICS INC. S E3 4 0 6 3 OUTLINE DRAWING DIP-8 Z e 1 8 2 7 3 6 4 5 B A a B b b1 D E e e1 F I L Z D b a A F I DIM N L e1 b1 E DIMENSIONS INCHE MM MIN MAX MIN MAX 0.131 0.020 0.045 0.065 0.014 0.022 0.008 0.012 0.430 0.313 0.384 0.100 0.300 0.260 0.200 0.125 0.150 0.060 3.32 0.51 1.15 1.65 0.356 0.55 0.204 0.304 10.92 7.95 9.75 2.54 7.62 6.60 5.08 3.18 3.81 1.52 OUTLINE DRAWING SOP-8 1 8 2 7 3 6 4 5 B N DIM D B1 A1 E A H C A A1 B B1 C D H E DIMENSIONS INCHES MM MIN MAX MIN MAX 0.0532 0.0688 0.0040 0.0098 0.0130 0.0200 0.050 BSC 0.0075 0.0098 0.1890 0.1968 0.2284 0.2440 0.1497 0.1574 1.35 1.75 0.10 0.25 0.33 0.51 1.27 BSC 0.19 0.25 4.80 5.00 5.80 6.20 3.80 4.00 Preliminary and all contents are subject to change without prior notice. Tel: 0086-(010)82895705, 82895706 http:// www.seawardinc.com.cn Room1605, Building1, International Pioneering Park, No.1 Shangdi XinXi Road, Haidian District, Beijing 100085, China ©2001SEAWARD ELECTRONICS INC. 5/5