FIXED FREQUENCY PWM MICROPOWER DC-to-DC CONVERTER

www.DataSheet4U.com Order this document by MC33466/D MC33466 Fixed Frequency PWM Micropower DC-to-DC Converter The MC33466 series are micropower 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 15 µA typical. The MC33466H–XXJT1 series features a highly accurate voltage reference, an oscillator, a pulse width modulation (PWM) controller, a driver transistor (Lx), an error amplifier and feedback resistive divider. The MC33466H–XXLT1 is identical to the MC33466H–XXJT1, 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. FIXED FREQUENCY PWM MICROPOWER DC–to–DC CONVERTER SEMICONDUCTOR TECHNICAL DATA TAB 1 MC33466 Series Features: • • • • • Low Quiescent Bias Current of 15 µA High Output Voltage Accuracy of ±2.5% Low Startup Voltage of 0.9 V at 1.0 mA Soft–Start = 500 µs Surface Mount Package H SUFFIX PLASTIC PACKAGE CASE 1213 (SOT–89) PIN CONNECTIONS MC33466H–XXJT1 Ground Output Lx 1 2 3 (Top View) Package (Tape/Reel) SOT–89 (Tape) (T ) TA = –30° to +80°C 30° 80°C SOT–89 (Tape) (T ) MC33466H–XXLT1 Ground Ext. Switch S it h Di Drive Output EXT 1 2 3 (Top View) Tab (Tab is connected to Pin 2) Tab (Tab is connected to Pin 2) ORDERING INFORMATION Device MC33466H–30JT1 MC33466H–33JT1 MC33466H–50JT1 MC33466H–30LT1 MC33466H–33LT1 MC33466H–50LT1 Output Voltage 3.0 3.3 5.0 3.0 3.3 5.0 Type Int. Switch S it h Operating Temperature Range Other voltages from 2.5 V to 7.5 V, in 0.1 V increments are available. Consult factory for information. © Motorola, Inc. 1999 Rev 4, 08/1999 MOTOROLA ANALOG IC DEVICE DATA 1 MC33466 Representative Block Diagrams MC33466H–XXJT1 D L Vin Cin 3 Lx VLx Limiter Drive PWM Controller 50 kHz Oscillator Phase Comp Soft–Start Vref 2 Output (Voltage Feedback) CO VO 1 Gnd L Vin Cin MC33466H–XXLT1 D VO 2 Rb 3 EXT Cb PWM Controller 100 kHz Oscillator Phase Comp Soft–Start Vref 1 Gnd Output (Voltage Feedback) CO Q Drive XX Denotes Output Voltage This device contains 100 active transistors. MAXIMUM RATINGS (TC = 25°C, unless otherwise noted.) ÁÁÁ Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á ÁÁÁ Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁ Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á ÁÁÁ Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Power Supply Voltage (Transient) VO VO 12 V V V V Power Supply Voltage (Operating) External Pin Voltage Lx Pin Voltage 8.0 VEXT VLx –0.3 to VO 12 EXT Pin Source/Sink Current Lx Pin Sink Current IEXT ILx 50/50 250 mA mA 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 PD RθJA TJ TA 500 200 125 mW °C/W °C °C °C –30 to +80 Tstg –40 to +125 NOTE: ESD data available upon request. Rating Symbol Value Unit 2 MOTOROLA ANALOG IC DEVICE DATA MC33466 ELECTRICAL CHARACTERISTICS (VCC = 2.0 V, IO = 10 mA and TA = 25°C, unless otherwise noted.) Characteristic OSCILLATOR Frequency LX output EXT output Symbol Min Typ Max Unit ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á ÁÁÁ Á Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á ÁÁÁ Á Á Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁ ÁÁÁ Á Á Á Á Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ fosc kHz 40 80 – 50 100 0.8 – 60 120 0.9 – Oscillator Minimum Startup Voltage (IO = 0 mA) Oscillator Minimum Supply Voltage (IO = 0 mA) Vstart VCC V V 0.7 LX OUTPUT (JT1 SUFFIX) ON State Sink Current (VLx = 0.4 V) 30KT1 Suffix 33KT1 Suffix 50KT1 Suffix VLx Voltage Limit (Note 1) ILx mA 60 63 80 – – – – – – VLxLim ILKG 0.65 – 0.8 – 1.0 0.5 V OFF State Leakage Current (VLx = 6.0 V) µA 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 1.5 1.575 2.0 1.5 1.575 2.0 – – – – – – – – – – – – Isink mA TOTAL DEVICE Maximum Duty Ratio Each Cycle Output Voltage 30KT1 or 30LT1 Suffix 33KT1 or 33LT1 Suffix 50KT1 or 50LT1 Suffix D 70 80 90 % V VO 2.925 3.218 4.875 0.5 – – – – – – IQ – – – – – – 3.0 3.3 5.0 2.0 15 17 30 3.075 3.383 5.125 – Soft–Start Time (Note 2) Tss IQ ms µA Quiescent Bias Current (Vin = 2.0 V, IO = 0 mA) 30JT1 Suffix 33JT1 Suffix 50JT1 Suffix Quiescent Bias Current (Vin = VO + 0.5 V, IO = 0 mA) 30JT1 Suffix 33JT1 Suffix 50JT1 Suffix 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 25 27 45 1.2 1.2 2.0 30 34.5 60 1.2 1.2 2.0 5.0 5.0 5.0 µA 50 56 90 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á Á Á 5.0 5.0 5.0 NOTES: 1. When the Lx switch is turned on, ILx current 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. 2. The soft–start circuit turn–on sequence is as follows: a) Vin is applied. b) The internal IC Vref is held at zero for 200 µs. During this time, the error amplifier output voltage ramps up to the positive voltage rail. c) The internal reference steps up to 0.7 V after 200 µs delay has timed out. d) The error amplifier output voltage integrates down to its steady state value. As the error amplifier output integrates down, the output Lx pin of EXT pin pulse width gradually widens to its steady operating value. MOTOROLA ANALOG IC DEVICE DATA 3 MC33466 Figure 1. Quiescent Current versus Temperature 50 I Q , QUIESCENT BIAS CURRENT (µ A) I Q , QUIESCENT BIAS CURRENT (µ A) MC33466H–33JT1 IO = 0 mA Vin = 2.0 V 2.0 MC33466H–33JT1 IO = 0 mA Vin = 5.5 V Figure 2. Quiescent Current versus Temperature 40 1.6 30 1.2 20 0.8 10 –40 –20 0 20 40 60 80 0.4 –40 –20 0 20 40 60 80 TA, AMBIENT TEMPERATURE (°C) TA, AMBIENT TEMPERATURE (°C) Figure 3. Oscillator Frequency versus Temperature 100 fosc , OSCILLATOR FREQUENCY (kHz) Dmax , MAXIMUM DUTY RATIO (%) MC33466H–50JT1 L = 120 µH IO = 10 mA Vin = 3.0 V 100 Figure 4. Maximum Duty Ratio versus Temperature MC33466H–50JT1 L = 120 µH IO = 10 mA Vin = 3.0 V 80 90 60 80 40 70 20 –40 –20 0 20 40 60 80 60 –40 –20 0 20 40 60 80 TA, AMBIENT TEMPERATURE (°C) TA, AMBIENT TEMPERATURE (°C) Figure 5. Lx Switching Current versus Temperature 200 I Lx , Lx SWITCHING CURRENT (mA) VLxLim, V Lx VOLTAGE LIMIT (V) 0 20 40 60 80 160 120 80 40 0 –40 MC33466H–50JT1 IO = 10 mA Vin = 2.0 V –20 TA, AMBIENT TEMPERATURE (°C) 1.0 0.9 0.8 0.7 Figure 6. VLx Voltage Limit versus Tempera