SP34063AEN

® Advanced SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator FEATURES ■ Supply Voltage: 3V - 36V ■ Current Limiting ■ Output Switch Current to 1.5A ■ Adjustable Output Voltage ■ Operation frequency up to 110KHz ■ Low Quiescent Current ■ Precision 2% Reference ■ Available in 8 pin NSOIC Package Switch Collector Switch Emitter Timing Capacitor GND 1 2 3 4 8 PIN NSOIC 8 Driver Collector 7 IPK Sense 6 VCC 5 Comparator Inverting Input Now Available in Lead Free Packaging APPLICATIONS ■ Battery Charger Circuit ■ NICs/Switches/Hubs ■ ADSL Modems ■ Negative Voltage Power Supply DESCRIPTION The SP34063A is a monolithic switching regulator control circuit containing the primary functions required for DC-DC converters. This device consists of an internal temperature compensated reference, voltage comparator, controlled duty cycle oscillator with active current limit circuit, driver and high current output switch. This device was specifically designed to be used in buck, boost, and Voltage-Inverting applications with a minimum number of external components. The SP34063A is available in 8 pin NSOIC package. TYPICAL APPLICATION CIRCUIT L1 150µH SP34063A R3 180 1 8 B A S Q R D1 1N5819 7 Ipk OSC 6 + 3 1.25V Reference Regulator 5 4 CT 2 RSC 0.22 VIN = 12V + C1 100µF CT 1500 pF R1 47k VOUT L2 1.0 µH 28V/175mA + C2 330 µF + Optional Filter VOUT C3 100 µF R2 2.2k Date: 1/11/05 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator © Copyright 2005 Sipex Corporation 1 ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. 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 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 1.5 Unit V V V V V V mA A Power Dissipation and Thermal Characteristics for NSOIC Package Power Dissipation (TA =25ºC) Thermal Resistance Operating Junction Temperature Storage Temperature Range ESD (Human Body Model) PD RØJA TJ TSTG 625 160 150 -65 to 150 2000 mW ºC /W ºC ºC V Date: 1/11/05 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator © Copyright 2005 Sipex Corporation 2 ELECTRICAL CHARACTERISTICS Unless otherwise noted, the following specifications apply for VCC = +5.0V, TA = -40 to 85°C. PARAMETER Oscillator Frequency Charge Current Discharge Current Discharge to Charge Current Ration Current Limit Sense Voltage Output Switch (note 1) Saturation Voltage, Dalington Connection VCE(sat) Saturation Voltage (note 2) DC Current Gain Collector Off-State Current Comparator 1.225 Threshold Voltage Threshold Voltage Line Regulation Input Bias Current Total Device VCC = 5.0V to 36V, CT = 1.0nF, Pin 7 = VCC, VPin 5 > VTH VTH 1.21 1.250 1.250 1.4 -20 1.275 V 1.29 5 -400 mV nA TA = 25ºC TA = -40ºC to 85ºC VCC = 3.0V to 36V VIN = 0V VCE(SAT) VCE(SAT) hFE IC(off) 50 1.0 0.45 75 0.01 1.3 0.7 100 µA V V ISW = 1.0A, Pins 1, 8 connected ISW = 1.0A, RPin 8 = 82 VCC, Forced β = 20 ISW = 1.0A, VCE = 5.0V, TA = 25ºC VCE = 36V to FOSC ICHG IDISCHG IDISCHG/ICHG VIPK(sense) 30 30 180 5.2 250 38 38 240 6.5 300 45 45 290 7.5 350 mV KHz µA µA VPin 5 = 0V, CT = 1.0nF TA = 25ºC VCC = 5.0V to 36V, TA = 25ºC VCC = 5.0V to 36V, TA = 25ºC Pin 7 to VCC,TA = 25ºC ICHG = IDISCHG, TA = 25ºC SYMBOL MIN. TYP. MAX. UNITS CONDITIONS REGLINE IIB Supply Current ICC 4 mA Note 1: Low duty cycle pulse technique are used during test to maintain junction temperature as close to ambient temperature as possible. Note 2: 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 2.0µs 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. Forced β of output switch: IC Output IC driver - 7.0mA* *The 100Ω resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts Date: 1/11/05 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator © Copyright 2005 Sipex Corporation ≥ 10 3 PIN DESCRIPTION Pin Number 1 2 3 4 5 6 7 8 Pin Name Switching Collector Switching Emitter Timing Capacitor GND Comparator Inverting Input VCC IPK Sense Driver Collector Description Internal switch transistor collector. Internal switch transistor emitter. Timing capacitor to control the switching frequency. Ground pin for all internal circuit. 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 BLOCK DIAGRAM Driver Collector 8 1 Switch Collector B A S Q R 7 I PK Sense I PK OSC VCC 6 + 1.25V Reference Regulator Comparator 5 Inverting Input 4 GND CT 2 3 Switch Emitter Timing Capacitor Date: 1/11/05 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator © Copyright 2005 Sipex Corporation 4 TYPICAL BOOST CONVERTER CIRCUIT L1 150µH SP34063A R3 180 1 8 B A S Q R D1 1N5819 7 Ipk OSC 6 + 3 1.25V Reference Regulator 5 4 CT 2 RSC 0.22 VIN = 12V + C1 100µF CT 1500 pF R1 47k VOUT L2 1.0 µH 28V/175mA + C2 330 µF + Optional Filter VOUT C3 100 µF R2 2.2k This is a typical boost 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 switching 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 1.25. 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 = 1.25V*(R1+R2)/R2(V). Date: 1/11/05 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator © Copyright 2005 Sipex Corporation 5 TYPICAL BUCK CONVERTER CIRCUIT SP34063A 1 8 B A S Q R 7 Ipk OSC 6 + + C1 1.25V Reference Regulator 4 3 CT 2 RSC 0.33 VIN = 25V D1 1N5819 L1 220 µH CT 470 pF 100µF 5 VOUT 5V/100mA R1 3.6k R2 1.2k + C2 L2 1.0 µH VOUT Optional Filter + 470 µF C3 100 µF This is a typical buck converter configuration. The working process in the steady state is similar to a boost converter, Vpin5 = VOUT*R2/(R1+R2) = 1.25(V). The output voltage can be decided by VOUT = 1.25V*(R1+R2)/R2(V). Date: 1/11/05 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator © Copyright 2005 Sipex Corporation 6 TYPICAL INVERTING CONVERTER CIRCUIT SP34063A 1 8 B A S Q R 7 Ipk OSC 6 + 3 + CT 2 RSC 0.24 VIN = 4.5V - 6V L1 88 µH 1.25V Reference Regulator C1 100µF 5 CT 1500 pF 4 D1 1N5819 R1 953k VOUT L2 1.0 µH -12V/100mA Optional Filter + VOUT R2 8.2k + C2 1000 µF C3 100 µF This is a typical boost converter configuration. The working process in the steady state is similar to a boost 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. The output voltage can be decided by VOUT = -1.25V*(R1+R2)/R1 (V). Date: 1/11/05 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator © Copyright 2005 Sipex Corporation 7 TYPICAL PERFORMANCE CHARACTERISTICS Ton-off Output Switch On-Off Time (us) 10000 1000 V CC = 5V PINS 7 = VCC PINS 5 = GND TA = 25ºC 100 toff ton 10 VCC = 5V CT = 1nF TA = 25ºC 1 10 100 1 0.1 Oscillator Timing Capacitor (nF) Figure 1. Output Switch On-Off Time vs. Oscillator Timing Capacitor 1000 Figure 2. Timing Capacitor Waveform 3.5 Icc Supply Current (mA) Frequency (kHz) 100 V CC = 5V Pin7 = VCC Pin5 = GND TA = 25ºC 3 2.5 2 1.5 1 0.5 0 0 5 10 15 20 CT = 1.0nF PINS 7 = V CC PINS 2 = GND 10 1 0.1 0.1 1 10 100 CT, Oscillator Timing Capacitor (nF) 25 30 35 40 Vcc Supply Voltage (V) Figure 3. Osillator Frequency vs. Timing Capacitor 1.45 Figure 4. Standard Supply Current vs. Supply Voltage 1.2 Saturation Voltage (V) Saturation Voltage (V) 1.44 1.43 1.42 1.41 1.4 1.39 1.38 1.37 0 VCC = 5V PINS 1,7,8 = VCC PINS 3,5 = GND TA = 25ºC 1 0.8 0.6 0.4 0.2 0 Darlington Forced Beta = 20 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Emitter Current (A) V CC = 5V PINS 7 = V CC PINS 2,3,5 = GND TA = 25ºC Collector Current (A) Figure 5. Emitter Follower Configuration Output Switch Saturation vs. Emitter Current Current Limit Sense Voltage (mV) 300 295 290 285 280 275 270 265 260 255 250 -50 0 50 Temperature 100 150 Figure 6. Common Emitter Configuration Output Switch Saturation vs. Collector Current Figure 7. Current Limit Sense Voltage vs. Temperature Date: 1/11/05 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator © Copyright 2005 Sipex Corporation 8 PACKAGE: 8 Pin NSOIC D e Ø E/2 E1/2 E1 L2 E Seating Plane Ø1 L1 1 L Gauge Plane Ø b VIEW C INDEX AREA (D/2 X E1/2) TOP VIEW A A1 Seating Plane A2 SIDE VIEW 8 Pin NSOIC JEDEC MO-012 (AA) Variation MIN NOM MAX SYMBOL A 1.35 1.75 A1 0.1 0.25 A2 1.25 1.65 b 0.31 0.51 c 0.17 0.24 4.90 BSC D 6.00 BSC E 3.90 BSC E1 1.27 BSC e L 0.4 1.27 1.04 REF L1 0.25 BSC L2 ø 0º 8º ø1 5º 15º Note: Dimensions in (mm) B B SEE VIEW C b c BASE METAL SECTION B-B WITH PLATING Date: 1/11/05 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator © Copyright 2005 Sipex Corporation 9 ORDERING INFORMATION Part Number Temperature Range Package Types SP34063AEN .................................................. -40°C to +85°C ................................................... 8-pin NSOIC SP34063AEN/TR ............................................ -40°C to +85°C .................................................. 8-pin NSOIC Available in lead free packaging. To order add “-L” suffix to part number. Example: SP34063AEN/TR = standard; SP34063AEN-L/TR = lead free /TR = Tape and Reel Pack quantity is 2,500 for NSOIC. CLICK HERE TO ORDER SAMPLES Corporation ANALOG EXCELLENCE Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Date: 1/11/05 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator © Copyright 2005 Sipex Corporation 10