BOLUTE MXIMUM TING These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the ope

Transcription

1 P0. Buck/Boost/Inverting DCDC ing egulator FETUE upply oltage: Current Limiting Output Current to. djustable Output oltage Operation frequency up to 0KHz Low Quiescent Current Precision % eference vailable in pin NOIC Package Emitter Timing Capacitor GND Now vailable in Lead Free Packaging PPLICTION Battery Charger Circuit NICs/es/Hubs DL Modems Negative oltage Power upply DECIPTION The P0 is a monolithic switching regulator control circuit containing the primary functions required for DCDC 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 oltageinverting applications with a minimum number of external components. The P0 is available in the pin NOIC package. TYPICL PPLICTION CICUIT PIN NOIC Driver I PK ense CC Comparator Inverting Input L 0µH P0 0Ω B Q D N9 IN = C 0.Ω C 00µF Ipk OC C T. eference egulator CT 00 pf kω OUT /m L.0 µh OUT Exar/ C Optional C.kΩ 0 µf Filter 00 µf Date: /9/0 P0. Buck/Boost/Inverting DCDC ing egulator Copyright 00 ipex Corporation

2 BOLUTE MXIMUM TING 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 ymbol alue Unit Power upply oltage Comparator Input oltage ange CC 0 I 0. to 0 oltage C ( switch) 0 Emitter oltage (pin=0) E ( switch) 0 to Emitter oltage C E switch) ( 0 Driver oltage C ( driver) 0 Driver Current (Note ) I C ( driver) 00 m Current I W. Power Dissipation and Thermal Characteristics for NOIC Package Power Dissipation (T = ºC) P D mw Thermal esistance ØJ 0 ºC / W Operating Junction Temperature T J 0 º C torage Temperature ange T TG to 0 º C ED (Human Body Model) 000 Exar/ Date: /9/0 P0. Buck/Boost/Inverting DCDC ing egulator Copyright 00 ipex Corporation

3 ELECTICL CHCTEITIC Unless otherwise noted, the following specifications apply for CC =.0, T = 0 to C. PMETE YMBOL M IN. T YP. MX. UNIT CONDITION Oscillator Frequency F C Charge Current I HG Discharge Current I ICHG O 0 C 0 0 D KHz µ 0 90 µ Pin = 0, = º C CT =.0nF T C C =.0 to, T = º C C C =.0 to, T = º C Discharge to Charge Current ation / I. DICHG CHG I.. P in to T = º C CC, Current Limit ense oltage PK(sense) Output (note ) 0 I 00 0 m IC HG = I, T = º C DICHG aturation oltage, Dalington Connection CE(sat) E(T). 0. C I W =.0, Pins, connected aturation oltage (note ) CE(T) DC Current Gain h FE 0 Offtate Current I C ( off) µ CE = Comparator Threshold oltage. TH =.0, Pin = I W CC, Forced β = 0 I W =.0, =.0, C E T = º C.0. T = º C..0.9 T = 0ºC to º C to Threshold oltage egulation Input Bias Current Total Device upply Current Line. EGLINE I IB 0 m 00 n I CC m CC IN = =.0 to 0 C C =.0 to, CT =.0nF, Pin =, Pin > CC TH Note : Low duty cycle pulse techniques are used during the test program to maintain junction temperature as close to ambient temperature as possible. Note : If the output switch is driven into hard saturation (nondarlington configuration) at low switch currents ( 00m) and high driver currents ( 0m), it may take up to.0µs for it to come out of saturation. This condition will shorten the off time at frequencies above 0KHz, and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a nondarlington configuration is used, the following output drive condition is recommended. I C Output Forced β of output switch: 0 I C driver.0m* Exar/ *The 00Ω resistor in the emitter of the driver device requires about.0 m before the output switch conducts. Date: /9/0 P0. Buck/Boost/Inverting DCDC ing egulator Copyright 00 ipex Corporation

4 PIN DECIPTION Pin Number Pin Name Description witching Internal switch transistor collector. witching Emitter Internal switch transistor emitter. T iming Capacitor Timing capacitor to control the switching frequency. G ND Ground pin for all internal circuit. Comparator Inverting Input CC I PK ense Driver Inverting input pin for internal comparator. oltage supply Peak Current ense Input by monitoring the voltage drop across an external I sense resistor to limit the peak current through the switch. oltage driver collector BLOCK DIGM Driver B Q I PK ense CC Comparator Inverting Input I PK OC C T. eference egulator Emitter Timing Capacitor GND Exar/ Date: /9/0 P0. Buck/Boost/Inverting DCDC ing egulator Copyright 00 ipex Corporation

5 TYPICL BOOT CONETE CICUIT L 0µH P0 0Ω B Q D N9 IN = C 0.Ω C 00µF Ipk OC C T. eference egulator CT 00 pf OUT L.0 µh kω /m OUT C Optional C.kΩ 0 µf Filter 00 µf This is a typical boost converter configuration. In the steady state, if the resistor divider voltage at pin is greater than the voltage in the noninverting input, which is. determined by the internal reference, the output of the comparator will go low. t 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 is lower than.. Then the output of the comparator will go high, the output switch will be allowed to conduct. ince pin = OUT */() =.(), The output voltage can be decided by OUT =.*()/(). Exar/ Date: /9/0 P0. Buck/Boost/Inverting DCDC ing egulator Copyright 00 ipex Corporation

6 TYPICL BUCK CONETE CICUIT P0 B Q IN = C 0.Ω C 00µF Ipk OC C T. eference egulator D N9 CT 0 pf L 0 µh L.0 µh OUT /00m OUT.kΩ Optional.kΩ Filter C C 0 µf 00 µf This is a typical buck converter configuration. The working process in the steady state is similar to a boost converter, pin = OUT */() =.(). The output voltage can be decided by OUT =.*()/(). Exar/ Date: /9/0 P0. Buck/Boost/Inverting DCDC ing egulator Copyright 00 ipex Corporation

7 TYPICL INETING CONETE CICUIT P0 B Q IN =. C 0.Ω C 00µF Ipk OC C T. eference egulator L µh CT 00 pf D N9 OUT L.0 µh 0.9kΩ /00m OUT Optional.kΩ Filter C C 000 µf 00 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 noninverting pin of the comparator is equal to. OUT, then pin = OUT */() =., OUT. The output voltage can be decided by OUT =.*()/ (). Exar/ Date: /9/0 P0. Buck/Boost/Inverting DCDC ing egulator Copyright 00 ipex Corporation

8 TYPICL PEFOMNCE CHCTEITIC Tonoff Output OnOff Time (us) CC = PIN = CC PIN = GND T = ºC Oscillator Timing Capacitor (nf) toff ton CC = CT = nf T = ºC Figure. Output OnOff Time vs. Oscillator Timing Capacitor Figure. Timing Capacitor Waveform Frequency (khz) CC = Pin = CC Pin = GND T =ºC CT, Oscillator Timing Capacitor (nf) Icc upply Current (m) cc upply oltage () C T =.0nF PIN = CC PIN = GND Figure. Osillator Frequency vs. Timing Capacitor aturation oltage () Figure. tandard upply Current vs. upply oltage... CC =. PIN,, = CC. PIN, = GND 0.. T = ºC Darlington 0. Forced Beta = CC = PIN = CC. 0 PIN,, = GND T = ºC Emitter Current () Current () aturation oltage () Figure. Emitter Follower Configuration Output aturation vs. Emitter Current Figure. Common Emitter Configuration Output aturation vs. Current Current Limit ense oltage (m) Temperature Figure. Current Limit ense oltage vs. Temperature Exar/ Date: /9/0 P0. Buck/Boost/Inverting DCDC ing egulator Copyright 00 ipex Corporation

9 PCKGE: Pin NOIC D/ D IDE IEW E E/ E/ E eating Plane Pin Designator to be within this INDEX E (D/ x E/) e TOP IEW b (L) h ø FONT IEW ø h Gauge Plane L ø c ø eating L Plane YMBOL Pin NOIC JEDEC M0 ariation Dimensions in Millimeters: Controlling Dimension MIN NOM MX MIN NOM MX b c E E e h BC.90 BC. BC BC 0. BC 0.00 BC 0.00 L L L EF 0. BC EF 0.00 BC ø 0º º 0º º ø º º º º ø 0º 0º D.90 BC 0.9 BC IPEX Pkg ignoff Date/ev: Dimensions in Inches Conversion Factor: Inch =.0 mm JL ug0 / ev Exar/ 9 Date: /9/0 P0. Buck/Boost/Inverting DCDC ing egulator Copyright 00 ipex Corporation

10 ODEING INFOMTION Part Number Temperature ange Package Types P0EN... 0 C to C... pin NOIC P0EN/T... 0 C to C... pin NOIC vailable in lead free packaging. To order add L suffix to part number. Example: P0EN/T = standard; P0ENL/T = lead free /T = Tape and eel Pack quantity is,00 for NOIC. Corporation NLOG EXCELLENCE ipex Corporation Headquarters and ales Office outh Hillview Drive Milpitas, C 90 TEL: (0) 900 FX: (0) 900 Exar/ 0 ipex Corporation reserves the right to make changes to any products described herein. ipex 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: /9/0 P0. Buck/Boost/Inverting DCDC ing egulator Copyright 00 ipex Corporation