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- 1. MIC38HC42/3/4/5 Micrel, Inc. April 2005 1 M9999-042205 MIC38HC42/3/4/5 BiCMOS 1A Current-Mode PWM Controllers General Description The MIC38HC4x family are fixed frequency current-mode PWM controllers with 1A drive current capability. Micrel¡¯s BiCMOS devices are pin-compatible with 384x bipolar de- vices. Their high output drive, with fast rise and fall times, combined with low startup current make it an ideal PWM controller where high efficiency is required. Undervoltage lockout circuitry allows the ¡¯42 and ¡¯44 versions to start up at 14.5V and operate down to 9V, and the ¡¯43 and ¡¯45 versions start at 8.4V with operation down to 7.6V. All versions operate up to 20V. When compared to bipolar UC384x devices operating from a 15V supply, start-up current has been reduced to 50?A typical and operating current has been reduced to 4.0 mA typical. Decreased output rise and fall times drive larger MOSFETs, and rail-to-rail output capability increases effi- ciency, especially at lower supply voltages. The MIC38HC4x also features a trimmed oscillator discharge current and bandgap reference. MIC38HC4x-1 is available in 14-pin plastic DIP and SOIC packages. 8-pin devices feature small size, while 14-pin devices separate the analog and power connections for improved performance and power dissipation. Functional Diagram Features ? Fast 20ns output rise and 15ns output fall times ? ¨C40¡ãC to +85¡ãC temperature range exceeds UC284x specifications ? High-performance, low-power BiCMOS Process ? Ultralow start-up current (50?A typical) ? Low operating current (4mA typical) ? High output drive (1A peak current, HC version) ? CMOS outputs with rail-to-rail swing ? Current-mode operation up to 500kHz ? Trimmed 5V bandgap reference ? Pin-for-pin compatible with UC3842/3843/3844/3845(A) ? Trimmed oscillator discharge current ? UVLO with hysteresis ? Low cross-conduction currents Applications ? Current-mode, off-line, switched-mode power supplies ? Current-mode, dc-to-dc converters. ? Step-down ¡°buck¡± regulators ? Step-up ¡°boost¡± regulators ? Flyback, isolated regulators ? Forward converters ? Synchronous FET converters T Q S R Q R 2R Oscillator UVLO 5V Reference VDD 7 (12) VREF 8 (14) RT/CT 4 (7) FB 2 (3) 2.5V COMP 1 (1) GND*(AGND) 5 (9) ISNS 3 (5) (VD) (11) OUT 6 (10) (PGND) (8) ( ) pins are on MIC38HC4x-1 (14-lead) versions only * MIC38HC4x (8-lead) versions only ? MIC38HC42, MIC38HC43 (96% max. duty cycle) versions only ? MIC38HC44, MIC38HC45 (50% max. duty cycle) versions only ? ? 35V * * Micrel, Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com
- 2. MIC38HC42/3/4/5 Micrel, Inc. M9999-042205 2 April 2005 Ordering Information Part Number Junction Standard Pb-Free Temp. Range Package MIC38HC42BN MIC38HC42YN ¨C40¡ãC to +85¡ãC 8-pin Plastic DIP MIC38HC43BN MIC38HC43YN ¨C40¡ãC to +85¡ãC 8-pin Plastic DIP MIC38HC44BN MIC38HC44YN ¨C40¡ãC to +85¡ãC 8-pin Plastic DIP MIC38HC45BN MIC38HC45YN ¨C40¡ãC to +85¡ãC 8-pin Plastic DIP MIC38HC42-1BN Contact Factory ¨C40¡ãC to +85¡ãC 14-pin Plastic DIP MIC38HC43-1BN Contact Factory ¨C40¡ãC to +85¡ãC 14-pin Plastic DIP MIC38HC44-1BN Contact Factory ¨C40¡ãC to +85¡ãC 14-pin Plastic DIP MIC38HC45-1BN Contact Factory ¨C40¡ãC to +85¡ãC 14-pin Plastic DIP MIC38HC42BM MIC38HC42YM ¨C40¡ãC to +85¡ãC 8-pin SOIC MIC38HC43BM MIC38HC43YM ¨C40¡ãC to +85¡ãC 8-pin SOIC MIC38HC44BM MIC38HC44YM ¨C40¡ãC to +85¡ãC 8-pin SOIC MIC38HC45BM MIC38HC45YM ¨C40¡ãC to +85¡ãC 8-pin SOIC MIC38HC42-1BM MIC38HC42-1YM ¨C40¡ãC to +85¡ãC 14-pin SOIC MIC38HC43-1BM MIC38HC43-1YM ¨C40¡ãC to +85¡ãC 14-pin SOIC MIC38HC44-1BM MIC38HC44-1YM ¨C40¡ãC to +85¡ãC 14-pin SOIC MIC38HC45-1BM MIC38HC45-1YM ¨C40¡ãC to +85¡ãC 14-pin SOIC UVLO Thresholds Startup 8.4V Startup 14.5V Duty Cycle Minimum Operating 7.6V Minimum Operating 9V 0% to 96% MIC38HC43 MIC38HC42 0% to 50% MIC38HC45 MIC38HC44 Selection Guide
- 3. MIC38HC42/3/4/5 Micrel, Inc. April 2005 3 M9999-042205 Pin Description Pin Number Pin Number Pin Name Pin Function N, M, MM -1BN, -1BM 1 1 COMP Compensation: Connect external compensation network to modify the error amplifier output. 2 NC Not internally connected. 2 3 FB Feedback (Input): Error amplifier input. Feedback is 2.5V at desired output voltage. 4 NC Not internally connected. 3 5 ISNS Current Sense (Input): Current sense comparator input. Connect to current sensing resistor or current transformer. 6 NC Not internally connected. 4 7 RT/CT Timing Resistor/Timing Capacitor: Connect external RC network to select switching frequency. 5 GND Ground: Combined analog and power ground. 8 PGND Power Ground: N-channel driver transistor ground. 9 AGND Analog Ground: Controller circuitry ground. 6 10 OUT Power Output: Totem-pole output. 11 VD Power Supply (Input): P-channel driver transistor supply input. Return to power ground (PGND). 7 12 VDD Analog Supply (Input): Controller circuitry supply input. Return to analog ground (AGND). 13 NC Not internally connected. 8 14 VREF 5V Reference (Output): Connect external RC network. 1 2 3 4 8 7 6 5 COMP FB ISNS RT/CT VREF VDD OUT GND MIC38HC4x 2NC NC13 3FB VDD12 4NC VD11 5ISNS OUT10 6NC AGND9 7RT/CT PGND8 1COMP VREF14 MIC38HC4x-1 8-Pin DIP (N) 8-Lead SOIC (M) 14-Pin DIP (-1BN) 14-Lead SOIC (-1BM) Pin Configuration
- 4. MIC38HC42/3/4/5 Micrel, Inc. M9999-042205 4 April 2005 Electrical Characteristics VDD = 15V, Note 4; RT = 9.09k?; CT = 3.3nF; ¨C40¡ãC ¡Ü TA ¡Ü 85¡ãC; unless noted Parameter Test Conditions Min Typ Max Units Reference Section Output Voltage TA = 25¡ãC, IO = 1mA 4.90 5.00 5.10 V Line Regulation 12V ¡Ü VDD ¡Ü 18V, IO = 5?A, Note 6 2 20 mV Load Regulation 1 ¡Ü IO ¡Ü 20mA 1 25 mV Temp. Stability Note 1 0.2 mV/¡ãC Total Output Variation Line, Load, Temp., Note 1 4.82 5.18 V Output Noise Voltage 10Hz ¡Ü f ¡Ü 10kHz, TA = 25¡ãC, Note 1 50 ?V Long Term Stability TA = 125¡ãC, 1000 hrs., Note 1 5 25 mV Output Short Circuit ¨C30 ¨C80 ¨C180 mA Oscillator Section Initial Accuracy TA = 25¡ãC, Note 5 49 52 55 kHz Voltage Stability 12 ¡Ü VDD ¡Ü 18V, Note 6 0.2 1.0 % Temp. Stability TMIN ¡Ü TA ¡Ü TMAX, Note 1 0.04 %/¡ãC Clock Ramp TA = 25¡ãC, VRT/CT = 2V 7.7 8.4 9.0 mA Reset Current TA = TMIN to TMAX 7.2 8.4 9.5 mA Amplitude VRT/CT peak to peak 1.9 Vp-p Error Amp Section Input Voltage VCOMP = 2.5V 2.42 2.50 2.58 V Input Bias Current VFB = 5.0V ¨C0.1 ¨C2 ?A AVOL 2 ¡Ü VO ¡Ü 4V 65 90 dB Unity Gain Bandwidth Note 1 0.7 1.0 MHz PSRR 12 ¡Ü VDD ¡Ü 18V 60 dB Output Sink Current VFB = 2.7V, VCOMP = 1.1V 2 14 mA Output Source Current VFB = 2.3V, VCOMP = 5V ¨C0.5 ¨C1 mA VOUT High VFB = 2.3V, RL = 15k to ground 5 6.8 V VOUT Low VFB = 2.7V, RL = 15k to VREF 0.1 1.1 V Absolute Maximum Ratings Zener Current (VDD) ...................................................30mA Operation at ¡Ý18V may require special precautions (Note 6). Supply Voltage (VDD), Note 6 .......................................20V Switch Supply Voltage (VD) ..........................................20V Current Sense Voltage (VISNS) ..................... ¨C0.3V to 5.5V Feedback Voltage (VFB)................................ ¨C0.3V to 5.5V Output Current, 38HC42/3/4/5 (IOUT)..............................1A Operating Junction Temperature (TJ) ....................... 150¡ãC Package Thermal Resistance 8-Pin Plastic DIP (¦ÈJA).......................................125¡ãC/W 8-Pin MM8? (¦ÈJA).............................................250¡ãC/W 8-Pin SOIC (¦ÈJA) ...............................................170¡ãC/W 14-Pin Plastic DIP (¦ÈJA).......................................90¡ãC/W 14-Pin SOIC (¦ÈJA) .............................................145¡ãC/W Storage Temperature (TA) ....................... ¨C65¡ãC to +150¡ãC
- 5. MIC38HC42/3/4/5 Micrel, Inc. April 2005 5 M9999-042205 Parameter Test Conditions Min Typ Max Units Current Sense Gain Notes 2, 3 2.85 3.0 3.15 V/V MaximumThreshold VCOMP = 5V, Note 2 0.9 1 1.1 V PSRR 12 ¡Ü VDD ¡Ü 18V, Note 2 70 dB Input Bias Current ¨C0.1 ¨C2 ?A Delay to Output 120 250 ns Output RDS(ON) ¡®HC¡¯ High ISOURCE = 200mA 10 ? RDS(ON) ¡®HC¡¯ Low ISINK = 200mA 5.5 ? Rise Time TA = 25¡ãC, CL = 1nF 20 50 ns Fall Time TA = 25¡ãC, CL = 1nF 15 40 ns Undervoltage Lockout Start Threshold MIC38HC42/4 13.5 14.5 15.5 V MIC38HC43/5 7.8 8.4 9.0 V Minimum Operating Voltage MIC38HC42/4 8 9 10 V MIC38HC43/5 7.0 7.6 8.2 V Pulse Width Modulator Maximum Duty Cycle MIC38HC42/3 94 96 % MIC38HC44/5 46 50 % Minimum Duty Cycle 0 % Total Standby Current Start-Up Current VDD = 13V, 38HC42/44 50 200 ?A VDD = 7.5V, 38HC43/45 Operating Supply Current VFB = VISNS = 0V 4.0 6.0 mA Zener Voltage (VDD) IDD = 25mA, Note 6 30 37 V Note 1: These parameters, although guaranteed, are not 100% tested in production. Note 2: Parameter measured at trip point of latch with VEA = 0. Note 3: Gain defined as: A = V V (I ) 0 V (I ) 0.8VPIN1 TH SNS TH SNS ? ; ¡Ü ¡Ü Note 4: Adjust VDD above the start threshold before setting at 15V. Note 5: Output frequency equals oscillator frequency for the MIC38HC42 and MIC38HC43. Output frequency for the MIC38HC44, and MIC38HC45 equals one half the oscillator frequency. Note 6: On 8-pin version, 20V is maximum input on pin 7, as this is also the supply pin for the output stage. On 14-pin version, 40V is maximum for pin 12 and 20V maximum for pin 11.
- 6. MIC38HC42/3/4/5 Micrel, Inc. M9999-042205 6 April 2005 Typical Characteristics 1 10 100 1x104 1x105 1x106 RT RESISTANCE(k?) OSCILLATOR FREQUENCY (Hz) Oscillator Frequency Configuration 10nF 4.7nF 1nF 470pF 200pF 1.8nF VDD = 15V 1 10 100 1x104 1x105 1x106 OUTPUTDEADTIME(%) FREQUENCY (Hz) MIC38C/HC42/43 Output Dead Time vs. Oscillator Frequency VDD = 15V 10nF 4.7nF 200pF 470pF 18nF 1nF 7.0 7.2 7.4 7.6 7.8 8.0 8.2 8.4 8.6 8.8 9.0 -60 -30 0 30 60 90 120 150 OSC.DISCHARGECURRENT(mA) TEMPERATURE (¡ãC) Oscillator Discharge Current vs. Temperature VDD = 15V VOSC = 2V 0.0 0.2 0.4 0.6 0.8 1.0 1.2 0 2 4 6 8 CURRENTSENSEAMPTHRESHOLD(V) ERROR AMPLIFIER OUTPUT (V) Current Sense Amplifier vs. Error Amplifier Output -50¡ãC 25¡ãC 125¡ãC 0 20 40 60 80 100 120 -60 -30 0 30 60 90 120 150 VREFSHORTCURCUITCURRENT(mA) TEMPERATURE (¡ãC) Short-Circuit Reference Current vs. Temperature VDD = 15V -15 -10 -5 0 5 10 15 20 25 0.0 0.2 0.4 0.6 0.8 1.0 OUTPUTVOLTAGE(V) TIME (?s) MIC38C4x Output Waveform VD = 15V CL = 1nF
- 7. MIC38HC42/3/4/5 Micrel, Inc. April 2005 7 M9999-042205 Package Information 0.380 (9.65) 0.370 (9.40) 0.135 (3.43) 0.125 (3.18) PIN 1 DIMENSIONS: INCH (MM) 0.018 (0.57) 0.100 (2.54) 0.013 (0.330) 0.010 (0.254) 0.300 (7.62) 0.255 (6.48) 0.245 (6.22) 0.380 (9.65) 0.320 (8.13) 0.0375 (0.952) 0.130 (3.30) 8-Pin Plastic DIP (N) .080 (1.524) .015 (0.381) .023 (.5842) .015 (.3810) .310 (7.874) .280 (7.112) .770 (19.558) MAX .235 (5.969) .215 (5.461) .060 (1.524) .045 (1.143) .160 MAX (4.064) .160 (4.064) .100 (2.540) .110 (2.794) .090 (2.296) .400 (10.180) .330 (8.362) .015 (0.381) .008 (0.2032) .060 (1.524) .045 (1.143) PIN 1 14-Pin Plastic DIP (N)
- 8. MIC38HC42/3/4/5 Micrel, Inc. M9999-042205 8 April 2005 45¡ã 0¡ã¨C8¡ã 0.244 (6.20) 0.228 (5.79) 0.197 (5.0) 0.189 (4.8) SEATING PLANE 0.026 (0.65) MAX) 0.010 (0.25) 0.007 (0.18) 0.064 (1.63) 0.045 (1.14) 0.0098 (0.249) 0.0040 (0.102) 0.020 (0.51) 0.013 (0.33) 0.157 (3.99) 0.150 (3.81) 0.050 (1.27) TYP PIN 1 DIMENSIONS: INCHES (MM) 0.050 (1.27) 0.016 (0.40) 8-Pin SOIC (M) 45¡ã 3¡ã¨C6¡ã 0.244 (6.20) 0.228 (5.80) 0.344 (8.75) 0.337 (8.55) 0.006 (0.15) SEATING PLANE 0.026 (0.65) MAX) 0.016 (0.40) TYP 0.154 (3.90) 0.057 (1.45) 0.049 (1.25) 0.193 (4.90) 0.050 (1.27) TYP PIN 1 DIMENSIONS: INCHES (MM) 14-Pin SOIC (M) MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser¡¯s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser¡¯s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. ? 2000 Micrel Incorporated