® SP34063A Advanced 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 8 Driver Collector 7 IPK Sense 1 2 8 PIN NSOIC VCC 3 6 4 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 S A Q R D1 1N5819 7 Ipk RSC 0.22 VIN = 12V 6 + 2 OSC CT + 3 CT 1500 pF - C1 100µF 1.25V Reference Regulator 5 4 VOUT L2 1.0 µH 28V/175mA R1 47k + C2 330 µF R2 2.2k Date: 1/11/05 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator 1 VOUT + Optional Filter C3 100 µF © Copyright 2005 Sipex Corporation 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 Symbol Value Unit Power Supply Voltage VCC 40 V Comparator Input Voltage Range VIR -0.3 to 40 V Switch Collector Voltage VC(switch) 40 V Switch Emitter Voltage (Vpin1=40V) VE(switch) 40 V Switch Collector to Emitter Voltage VCE(switch) 40 V Driver Collector Voltage VC (driver) 40 V Driver Collector Current (Note 2) IC (driver) 100 mA ISW 1.5 A PD 625 mW RØJA 160 ºC /W TJ 150 ºC TSTG -65 to 150 ºC - 2000 V Switch Current Power Dissipation and Thermal Characteristics for NSOIC Package Power Dissipation (TA =25ºC) Thermal Resistance Operating Junction Temperature Storage Temperature Range ESD (Human Body Model) Date: 1/11/05 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator 2 © Copyright 2005 Sipex Corporation ELECTRICAL CHARACTERISTICS Unless otherwise noted, the following specifications apply for VCC = +5.0V, TA = -40 to 85°C. PARAMETER SYMBOL MIN. TYP. MAX. UNITS CONDITIONS Oscillator VPin 5 = 0V, CT = 1.0nF TA = 25ºC Frequency FOSC 30 38 45 KHz Charge Current ICHG 30 38 45 µA VCC = 5.0V to 36V, TA = 25ºC Discharge Current IDISCHG 180 240 290 µA VCC = 5.0V to 36V, TA = 25ºC Discharge to Charge Current Ration IDISCHG/ICHG 5.2 6.5 7.5 Current Limit Sense Voltage VIPK(sense) 250 300 350 mV Pin 7 to VCC,TA = 25ºC ICHG = IDISCHG, TA = 25ºC Output Switch (note 1) Saturation Voltage, Dalington Connection VCE(sat) VCE(SAT) - 1.0 1.3 V ISW = 1.0A, Pins 1, 8 connected Saturation Voltage (note 2) VCE(SAT) - 0.45 0.7 V ISW = 1.0A, RPin 8 = 82 VCC, Forced β = 20 hFE 50 75 - IC(off) - 0.01 100 1.225 1.250 1.275 DC Current Gain Collector Off-State Current to ISW = 1.0A, VCE = 5.0V, TA = 25ºC µA VCE = 36V Comparator Threshold Voltage VTH Threshold Voltage Line Regulation Input Bias Current V 1.21 TA = 25ºC 1.250 1.29 TA = -40ºC to 85ºC REGLINE 1.4 5 mV VCC = 3.0V to 36V IIB -20 -400 nA VIN = 0V 4 mA VCC = 5.0V to 36V, CT = 1.0nF, Pin 7 = VCC, VPin 5 > VTH Total Device Supply Current ICC 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 ≥ 10 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 3 © Copyright 2005 Sipex Corporation PIN DESCRIPTION Pin Number Pin Name 1 Switching Collector 2 Switching Emitter Internal switch transistor emitter. 3 Timing Capacitor Timing capacitor to control the switching frequency. 4 GND 5 Comparator Inverting Input 6 VCC 7 IPK Sense 8 Driver Collector Description Internal switch transistor collector. 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 B S A 1 Switch Collector 2 Switch Emitter Q R 7 I PK Sense I PK CT OSC VCC 6 + 3 - Timing Capacitor 1.25V Reference Regulator Comparator 5 Inverting Input Date: 1/11/05 4 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator 4 GND © Copyright 2005 Sipex Corporation TYPICAL BOOST CONVERTER CIRCUIT L1 150µH SP34063A R3 180 1 8 B S A Q R D1 1N5819 7 Ipk RSC 0.22 OSC VIN = 12V 6 + 2 CT + 3 CT 1500 pF - C1 100µF 1.25V Reference Regulator 5 4 VOUT L2 1.0 µH 28V/175mA R1 47k + C2 330 µF R2 2.2k VOUT + Optional Filter C3 100 µF 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 5 © Copyright 2005 Sipex Corporation TYPICAL BUCK CONVERTER CIRCUIT SP34063A 1 8 B S A Q R 7 Ipk RSC 0.33 2 OSC VIN = 25V CT D1 1N5819 6 + 3 - + C1 100µF 5 1.25V Reference Regulator L1 220 µH CT 470 pF 4 VOUT 5V/100mA R1 3.6k R2 1.2k + C2 470 µF L2 1.0 µH VOUT Optional Filter + 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 6 © Copyright 2005 Sipex Corporation TYPICAL INVERTING CONVERTER CIRCUIT SP34063A 1 8 B S A Q R 7 Ipk RSC 0.24 2 OSC VIN = 4.5V - 6V CT L1 88 µH 6 + 3 + - C1 100µF 1.25V Reference Regulator CT 1500 pF 5 D1 1N5819 4 VOUT L2 1.0 µH -12V/100mA R1 953k R2 8.2k + C2 1000 µF VOUT Optional Filter + 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 7 © Copyright 2005 Sipex Corporation Ton-off Output Switch On-Off Time (us) TYPICAL PERFORMANCE CHARACTERISTICS 10000 V CC = 5V PINS 7 = VCC PINS 5 = GND TA = 25ºC 1000 toff ton 100 VCC = 5V CT = 1nF TA = 25ºC 10 1 0.1 1 10 100 Oscillator Timing Capacitor (nF) Figure 1. Output Switch On-Off Time vs. Oscillator Timing Capacitor Figure 2. Timing Capacitor Waveform 3.5 Icc Supply Current (mA) Frequency (kHz) 1000 V CC = 5V Pin7 = VCC Pin5 = GND TA = 25ºC 100 10 1 0.1 3 2.5 2 1.5 CT = 1.0nF PINS 7 = V CC PINS 2 = GND 1 0.5 0 0.1 1 10 100 0 CT, Oscillator Timing Capacitor (nF) 5 10 15 20 25 30 35 40 Vcc Supply Voltage (V) Figure 4. Standard Supply Current vs. Supply Voltage Figure 3. Osillator Frequency vs. Timing Capacitor 1.2 VCC = 5V PINS 1,7,8 = VCC PINS 3,5 = GND TA = 25ºC 1.44 1.43 1.42 1.41 Saturation Voltage (V) Saturation Voltage (V) 1.45 1.4 1.39 1.38 1.37 0.8 Darlington Forced Beta = 20 0.6 0.4 0.2 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 0 Emitter Current (A) 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 V CC = 5V PINS 7 = V CC PINS 2,3,5 = GND TA = 25ºC Collector Current (A) Figure 6. Common Emitter Configuration Output Switch Saturation vs. Collector Current Figure 5. Emitter Follower Configuration Output Switch Saturation vs. Emitter Current Current Limit Sense Voltage (mV) 1 300 295 290 285 280 275 270 265 260 255 250 -50 0 50 100 150 Temperature Figure 7. Current Limit Sense Voltage vs. Temperature Date: 1/11/05 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator 8 © Copyright 2005 Sipex Corporation PACKAGE: 8 Pin NSOIC D Ø e E/2 E1/2 E1 L2 E Seating Plane L1 1 Ø L Ø1 Gauge Plane VIEW C b INDEX AREA (D/2 X E1/2) TOP VIEW A1 A Seating Plane A2 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 SIDE VIEW B B SEE VIEW C b c Note: Dimensions in (mm) BASE METAL SECTION B-B WITH PLATING Date: 1/11/05 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator 9 © Copyright 2005 Sipex Corporation 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 10 © Copyright 2005 Sipex Corporation