Order this document by MC33463/D The MC33463 series are micropower step–up switching voltage regulators, specifically designed for handheld and laptop applications, to provide regulated output voltages using a minimum of external parts. A wide choice of output voltages are available. These devices feature a very low quiescent bias current of 4.0 µA typical. The MC33463H–XXKT1 series features a highly accurate voltage reference, an oscillator, a variable frequency modulation (VFM) controller, a driver transistor (Lx), a comparator and feedback resistive divider. VARIABLE FREQUENCY MICROPOWER DC–to–DC CONVERTER SEMICONDUCTOR TECHNICAL DATA The MC33463H–XXLT1 is identical to the MC33463H–XXKT1, except that a drive pin (EXT) for an external transistor is provided. Due to the low bias current specifications, these devices are ideally suited for battery powered computer, consumer, and industrial equipment where an extension of useful battery life is desirable. TAB 1 MC33463 Series Features: • Low Quiescent Bias Current of 4.0 µA • High Output Voltage Accuracy of ±2.5% • Low Startup Voltage of 0.9 V at 1.0 mA • Wide Output Voltage Range of 2.5 V to 7.5 V Available • High Efficiency of 80% Typical • Surface Mount Package H SUFFIX PLASTIC PACKAGE CASE 1213 (SOT–89) PIN CONNECTIONS MC33463H–XXKT1 Ground 1 Output 2 Lx 3 ORDERING INFORMATION Device Output Voltage MC33463H–30KT1 MC33463H–33KT1 MC33463H–50KT1 3.0 3.3 5.0 Int. Switch S it h MC33463H–30LT1 MC33463H–33LT1 MC33463H–50LT1 3.0 3.3 5.0 Ext. S it h Switch Di Drive Type Operating Temperature Range (Top View) SOT–89 (T (Tape) ) MC33463H–XXLT1 Ground 1 Output 2 EXT 3 Other voltages from 2.5 V to 7.5 V, in 0.1 V increments are available. Consult factory for information. Tab (Tab is connected to Pin 2) (Top View) Motorola, Inc. 1999 MOTOROLA ANALOG IC DEVICE DATA (Tab is connected to Pin 2) Package (Tape/Reel) SOT–89 (T (Tape) ) 30° to +80°C 80°C TA = –30° Tab Rev 1 1 MC33463 Representative Block Diagrams MC33463H–XXKT1 D L 3 Vin 2 VLx Limitier Lx VO Output Cin CO Drive VFM Controller 100 kHz Oscillator Vref 1 Gnd MC33463H–XXLT1 L Vin D Cin 2 Rb 3 Q VO Output Drive CO EXT VFM Controller Cb 100 kHz Oscillator Vref 1 Gnd XX Denotes Output Voltage This device contains 100 active transistors. MAXIMUM RATINGS (TC = 25°C, unless otherwise noted.) ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁ Symbol Value Unit Power Supply Voltage (Transient) Rating VCC 12 V Power Supply Voltage (Operating) VCC 8.0 V External Pin Voltage VEXT –0.3 to VO V Lx Pin Voltage VLx 12 V EXT Pin Source/Sink Current IEXT 50/50 mA ILx 250 mA PD RθJA TJ 500 200 mW °C/W 125 °C TA –30 to +80 °C Tstg –40 to +125 °C Lx Pin Sink Current Power Dissipation and Thermal Characteristics H Suffix, Plastic Package Case 1213 (SOT–89) Maximum Power Dissipation @ TA = 25°C Thermal Resistance, Junction–to–Air Operating Junction Temperature Operating Ambient Temperature Storage Temperature Range 2 MOTOROLA ANALOG IC DEVICE DATA MC33463 ELECTRICAL CHARACTERISTICS (VCC = 2.0 V, IO = 10 mA and TA = 25°C, unless otherwise noted.) Characteristic Symbol Min Typ Max Unit Frequency fosc 80 100 120 kHz Oscillator Minimum Supply Voltage (IO = 0 mA) VCC – 0.7 0.8 V D 65 75 85 % 60 63 80 – – – – – – VLxLim 0.65 0.8 1.0 V ILKG – – 0.5 µA 1.5 1.575 2.0 – – – – – – 1.5 1.575 2.0 – – – – – – 2.925 3.218 4.875 3.0 3.3 5.0 3.075 3.383 5.125 – – – 4.0 4.3 6.0 8.0 8.6 12 – – – 1.2 1.2 2.0 5.0 5.0 5.0 – – – 30 34.5 60 50 56 90 – – – 1.2 1.2 2.0 5.0 5.0 5.0 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ OSCILLATOR Oscillator Duty Ratio Each Cycle Lx OUTPUT (KT1 SUFFIX) ON State Sink Current (VLx = 0.4 V) 30KT1 Suffix 33KT1 Suffix 50KT1 Suffix VLx Voltage Limit (Note 1) OFF State Leakage Current (VLx = 6.0 V) ILx mA EXT OUTPUT (LT1 SUFFIX) ON State Source Current (VEXT = VO – 0.4 V) 30LT1 Suffix 33LT1 Suffix 50LT1 Suffix OFF State Sink Current (VEXT = 0.4 V) 30LT1 Suffix 33LT1 Suffix 50LT1 Suffix Isource mA Isink mA TOTAL DEVICE Output Voltage 30KT1 or 30LT1 Suffix 33KT1 or 33LT1 Suffix 50KT1 or 50LT1 Suffix VO Quiescent Bias Current (Vin = 2.0 V, IO = 0 mA) 30KT1 Suffix 33KT1 Suffix 50KT1 Suffix Quiescent Bias Current (Vin = VO + 0.5 V, IO = 0 mA) 30KT1 Suffix 33KT1 Suffix 50KT1 Suffix IQ Quiescent Bias Current (Vin = 2.0 V, IO = 0 mA) 30LT1 Suffix 33LT1 Suffix 50LT1 Suffix Quiescent Bias Current (Vin = VO + 0.5 V, IO = 0 mA) 30LT1 Suffix 33LT1 Suffix 50LT1 Suffix IQ V µA ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁ NOTE: µA 1. When the Lx switch is turned on, ILx carried through the RDS(on) of the Lx switch results in VLx. When VLx reaches VLxLim, the Lx switch is turned off by the Lx switch protection circuit. MOTOROLA ANALOG IC DEVICE DATA 3 MC33463 Figure 1. Quiescent Current versus Temperature Figure 2. Quiescent Current versus Temperature 2.0 40 MC33463H–30LT1 Vin = 2.0 V IO = 0 mA I Q , QUIESCENT BIAS CURRENT (µ A) I Q , QUIESCENT BIAS CURRENT (µ A) 50 30 20 10 –40 0 –20 20 40 60 1.2 0.8 20 40 TA, AMBIENT TEMPERATURE (°C) Figure 3. Oscillator Frequency versus Temperature Figure 4. Oscillator Duty Ratio versus Temperature 160 60 80 60 80 100 MC33463H–50KT1 Vin = 2.0 V IO = 10 mA 120 80 40 –40 –20 0 20 40 60 MC33463H–50KT1 Vin = 2.0 V IO = 10 mA 90 80 70 60 –40 80 TA, AMBIENT TEMPERATURE (°C) –20 0 20 40 TA, AMBIENT TEMPERATURE (°C) Figure 5. Lx Switching Current versus Temperature Figure 6. VLx Voltage Limit versus Temperature 0.9 VLxLim , Lx VOLTAGE LIMIT (V) 200 I Lx , Lx SWITCHING CURRENT (mA) 0 –20 TA, AMBIENT TEMPERATURE (°C) D, DUTY RATIO (%) fosc , OSCILLATOR FREQUENCY (kHz) 1.6 0.4 –40 80 200 160 120 80 MC33463H–50KT1 Vin = 2.0 V IO = 10 mA 40 –20 0 –40 20 40 TA, AMBIENT TEMPERATURE (°C) 4 MC33463H–30KT1 Vin = 3.5 V IO = 0 mA 60 80 0.8 0.7 0.6 MC33463H–50KT1 Vin = 2.0 V IO = 10 mA 0.5 –40 –20 0 20 40 60 80 TA, AMBIENT TEMPERATURE (°C) MOTOROLA ANALOG IC DEVICE DATA MC33463 Figure 7. Output Voltage versus Output Current Figure 8. Output Voltage versus Output Current 6.0 6.0 5.0 Vin = 1.5 V 4.0 VO , OUTPUT VOLTAGE (V) VO , OUTPUT VOLTAGE (V) Vin = 4.0 V Vin = 3.0 V Vin = 2.0 V 3.0 Vin = 0.9 V 2.0 1.0 MC33463H–50KT1 L = 120 µH TA = 25°C 0 20 40 60 80 100 120 5.0 4.0 V = 0.9 V in 3.0 2.0 MC33463H–50LT1 L = 28 µH TA = 25°C 1.0 0 100 200 IO, OUTPUT CURRENT (mA) Figure 9. Efficiency versus Output Current Vin = 3.0 V 600 80 EFFICIENCY (%) 60 Vin = 0.9 V 40 MC33463H–33KT1 L = 82 µH TA = 25°C Figure 15 0 40 20 Vin = 3.0 V 60 Vin = 0.9 V 60 80 100 0 120 Vin = 2.0 V 40 MC33463H–33LT1 L = 28 µH TA = 25°C Figure 16 20 0 100 200 300 400 500 IO, OUTPUT CURRENT (mA) IO, OUTPUT CURRENT (mA) Figure 11. Startup/Hold Voltage versus Output Current Figure 12. Startup/Hold Voltage versus Output Current 600 2.0 1.6 Vstart /V hold , VOLTAGE LIMIT (V) EFFICIENCY (%) 500 Figure 10. Efficiency versus Output Current Vin = 2.0 V 20 Vstart /V hold , STARTUP/HOLD VOLTAGE LIMIT (V) 400 100 80 1.2 Vstart 0.8 0.4 0 300 IO, OUTPUT CURRENT (mA) 100 0 Vin = 3.0 V Vin = 1.5 V Vin = 2.0 V Vhold 0 2.0 MC33463H–50KT1 L = 82 µH TA = 25°C 4.0 6.0 8.0 IO, OUTPUT CURRENT (mA) MOTOROLA ANALOG IC DEVICE DATA 10 12 Vstart 1.5 1.0 Vhold 0.5 0 0 20 40 60 MC33463H–50LT1 L = 28 µH TA = 25°C 80 100 120 IO, OUTPUT CURRENT (mA) 5 MC33463 Figure 14. Startup/Hold Voltage versus Temperature VO , OUTPUT VOLTAGE (V) 5.1 5.0 4.9 4.8 –40 –20 0 20 MC33463H–50KT1 L = 120 µH 40 60 80 Vstart/V hold , STARTUP/HOLD VOLTAGE (V) Figure 13. Output Voltage versus Temperature 1.0 0.8 Vstart 0.6 Vhold 0.4 0.2 –40 MC33463H–50KT1 L = 120 µH IO = 1.0 mA –20 TA, AMBIENT TEMPERATURE (°C) DEFINITIONS Quiescent Bias Current – Current which is used to operate the switching regulator chip and is not delivered to the load. Leakage Current – Current drawn through a transistor junction, under a specified collector voltage, when the transistor is off. FUNCTIONAL DESCRIPTION Introduction The MC33463 series are monolithic power switching regulators optimized for dc–to–dc converter applications where power drain must be minimized. The combination of features in this series allows the system designer to directly implement step–up, step–down or flyback converters with a small number of external components. Potential applications include low power consumer products and battery powered portable products. Typical application circuits are shown in Figure 15 and Figure 16. Operating Description The MC33463 series converters each operate as a fixed on–time, variable off–time voltage mode ripple regulator. Operation is intended to be in the discontinuous mode, where the inductor current ramps up to a peak value which is greater than or equal to twice the value of the dc input current during the on–time of the transistor switch. During the off–time of the transistor switch, the inductor current ramps down to zero and remains at zero until another switching cycle begins. Because the output voltage pin is also used as the supply voltage for powering internal circuitry, an external startup circuit is needed in step–down and flyback converter designs to provide initial power to the integrated circuit to begin switching. The startup circuit needed can be three discrete 6 0 20 40 60 80 TA, AMBIENT TEMPERATURE (°C) components, as shown in Figure 17, or a micropower undervoltage sensor, as shown in Figure 18. Oscillator The oscillator frequency, is internally programmed to 100 kHz. The duty ratio of the oscillator is designed for a constant value of 0.75 nominal. Hence the nominal on–time of the power switch is: 0.75 D ton 7.5 µs f osc (100 kHz) + + + Feedback Comparator The output voltage is sensed and fed to a high speed comparator noninverting input through an internal resistive divider. The comparator inverting input is connected to an internally trimmed to 0.7 V reference. With a voltage mode ripple converter operating under normal conditions, output switch conduction is initiated and terminated by the oscillator, off–time is controlled by the high speed voltage feedback comparator. Driver and Output Switch To aid in system design flexibility and conversion efficiency, two output driver options are provided. The MC33463H–XXKT1 converters have an internal drive transistor which is capable of sinking currents greater than 60 mA into the Lx pin. An internal VLx limiter circuit senses if the Lx pin voltage exceeds 1.0 V during ton and turns off the drive transistor. The MC33463H–XXLT1 provides output drive for an external transistor. Applications The following converter applications show the simplicity and flexibility of the converter architecture. Three main converter topologies are demonstrated in Figures 15 through 19. MOTOROLA ANALOG IC DEVICE DATA MC33463 Figure 15. MC33463H–50KT1 Typical Step–Up Application MBRD520LT1 82 µH MC33463H–XXKT1 2 3 Lx VO Vin VO 22 µF Gnd 1 Figure 16. MC33463H–50LT1 Typical Step–Up Application MBRD520LT1 28 µH MC33463H–XXLT1 2 VO Vin 300 MMBT2222ALT1 3 VO 100 µF EXT Gnd 0.01 µF MOTOROLA ANALOG IC DEVICE DATA 1 7 MC33463 Figure 17. MC33463H–33KT1 Step–Down Application Startup Circuit MMBT2222ALT1 1.5 k BZX84C3V3LT1 3.3 V 47 µH MMBT2907ALT1 Vin VO 3.3 V MBRD0520LT1 1.0 k 100 µF MC33463H–33KT1 100 3 2 VLx Limiter Lx Output 100 µF Drive VFM Controller 100 kHz Oscillator Vref 1 Test 8 Gnd Conditions Results Line Regulation Vin = 5.0 V to 8.0 V, IO = 100 mA 18.5 mV = ±0.3% Load Regulation Vin = 5.0 V, IO = 1.0 mA to 100 mA 5.7 mV = ±0.1% Output Ripple Vin = 5.0 V, IO = 100 mA 40 mVpp Efficiency Vin = 5.0 V, IO = 100 mA 60.3% MOTOROLA ANALOG IC DEVICE DATA MC33463 Figure 18. Micropower Step–Down Application Startup Circuit MC33464N–30ATR MMBT2907ALT1 2 In Out Gnd 3 1 10 k 10 k 47 µH MMBT2907ALT1 Vin VO 3.3 V MBRD0520LT1 1.0 k 100 µF MC33463H–33KT1 100 3 Lx 2 VLx Limiter Output 100 µF Drive VFM Controller 100 kHz Oscillator Vref 1 MOTOROLA ANALOG IC DEVICE DATA Gnd 9 MC33463 Figure 19. Flyback Application MMBT2222ALT1 1.5 k Startup Circuit 3.3 V MMBT2907ALT1 Vin VO 1.0 k 100 µF MC33463H–33KT1 100 3 2 VLx Limiter Output Lx 100 µF Drive VFM Controller 100 kHz Oscillator Vref 1 10 Gnd MOTOROLA ANALOG IC DEVICE DATA MC33463 Figure 20. Design Equations Calculation Step–Down ton L t ton IL(avg) (V in ƫ * Vsat * VO) (2I ) O (V in ȱȧǒ Ȳ DI L 1 16f oscC O Ǔ 2 D f osc t (n)(VinP ) (ton) Iin Iin O (V ȳȧ ȴ ) (ESR)2 D f osc 2 * Vsat * VO)(ton) L Flyback t (n)(VinP ) (ton) IO IL(pk) Vripple(pp) ƪ D f osc Step–Up 1 2 in * Vsat)(ton) 2 O (V in * Vsat)(ton) L L [ (ton(C)(I)O) [ (ton(C)(I)O) O O The following converter design characteristics must be chosen: Vin – Nominal Operating dc input voltage VO – Desired dc output voltage IO – Desired dc output current Vripple(pp) – Desired peak–to–peak output ripple voltage. For best performance the ripple voltage should be kept to a low value since it will directly affect line and load regulation. Capacitor CO should be a low equivalent series resistance (ESR) electrolytic designed for switching regulator applications. NOTE: 1. Vsat – Saturation voltage of the switching transistor. n – Estimated circuit efficiency. MOTOROLA ANALOG IC DEVICE DATA 11 MC33463 OUTLINE DIMENSIONS H SUFFIX PLASTIC PACKAGE CASE 1213–01 (SOT–89) ISSUE O A D A2 C B D1 E1 E L1 B 0.10 B1 e M C B S A S 2X 0.10 M C B S A S C NOTES: 1. DIMENSIONS ARE IN MILLIMETERS. 2. INTERPRET DIMENSIONS AND TOLERANCING PER ASME Y14.5M, 1994. 3. DATUM C IS A SEATING PLANE. DIM A2 B B1 C D D1 E E1 e e1 L1 MILLIMETERS MIN MAX 1.40 1.60 0.37 0.57 0.32 0.52 0.30 0.50 4.40 4.60 1.50 1.70 ––– 4.25 2.40 2.60 1.50 BSC 3.00 BSC 0.80 ––– e1 Motorola reserves the right to make changes without further notice to any products herein. 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