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MIC4576WU-TR

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Voltage Regulators - Switching Regulators
Manufacturer: Microchip


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MIC4576WU-TR
Microchip

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Microchip

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MIC4576WU-TR
Microchip

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MIC4576WU-TR
Microchip

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Manufacturer
Microchip
Product Category
Voltage Regulators - Switching Regulators
RoHS - XON
Y Icon ROHS
Topology
Buck
Input Voltage MAX
36 V
Switching Frequency
200 Khz
Output Voltage
1.23 v to 33 V
Output Current
3 A
Number of Outputs
1 Output
Maximum Operating Temperature
+85 C
Mounting Style
Smd/Smt
Package / Case
TO-263-5
Packaging
Reel
Type
200 Khz Simple 3 A Buck Regulator
Brand
Microchip Technology / Micrel
Input Voltage Min
4 V
Minimum Operating Temperature
- 40 C
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MIC4576 Micrel, Inc. MIC4576 200kHz Simple 3A Buck Regulator General Description Features The MIC4576 is a series of easy to use ?xed and adjustable ? Fixed 200kHz operation BiCMOS step-down (buck) switch-mode voltage regulators. ? 3.3V, 5V, and adjustable output versions The 200kHz MIC4576 duplicates the pinout and function of ? Voltage over speci?ed line and load conditions: the 52kHz LM2576. The higher switching frequency may Fixed version: ?3% max. output voltage allow up to a 2:1 reduction in output ?lter inductor size. Adjustable version: ?2% max. feedback voltage ? Guaranteed 3A switch current The MIC4576 is available in 3.3V, and 5V ?xed output ver- ? Wide 4V to 36V input voltage range sions or a 1.23V to 33V adjustable output version. Both ? Wide 1.23V to 33V output voltage range versions are capable of driving a 3A load with excellent line ? Requires minimum external components and load regulation. ? < 200?A typical shutdown mode The feedback voltage is guaranteed to ?2% tolerance for ? 75% ef?ciency (adjustable version > 75% typical) adjustable versions, and the output voltage is guaranteed to ? Standard inductors are 25% of typical LM2576 values ?3% for ?xed versions, within speci?ed voltages and load con- ? Thermal shutdown ditions. The oscillator frequency is guaranteed to ?10%. ? Overcurrent protection In shutdown mode, the regulator draws less than 200?A ? 100% electrical thermal limit burn-in standby current. The regulator performs cycle-by-cycle Applications current limiting and thermal shutdown for protection under fault conditions. ? Simple high-ef?ciency step-down (buck) regulator ? Ef?cient preregulator for linear regulators This series of simple switch-mode regulators requires a mini- ? On-card switching regulators mum number of external components and can operate using ? Positive-to-negative converter (inverting buck-boost) a standard series of inductors. Frequency compensation is ? Battery Charger provided internally. ? Negative boost converter The MIC4576 is available in TO-220 (T) and TO-263 (U) ? Step-down to 3.3V for Intel Pentium? packages for the industrial temperature range. and similar microprocessors Typical Applications L1 5V/3A 5 2 Shutdown SHDN SW Enable 33?H MIC4576-5.0WT 8V to 36V 1 4 C2 V FB IN 1000?F C1 GND 16V D1 470?F 3 MBR360 63V Fixed Regulator L1 12V/3A 5 2 Shutdown SHDN SW Enable 68?H R2 MIC4576WT 13.0k 16V to 36V 4 1 C2 1% V FB IN 1000?F C1 GND R1 16V 470?F MBR360 1.50k 3 63V 1% Adjustable Regulator Micrel, Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com March 2006 1 MIC4576MIC4576 Micrel, Inc. MIC4576 200kHz Simple 3A Buck Regulator General Description Features The MIC4576 is a series of easy to use ?xed and adjustable ? Fixed 200kHz operation BiCMOS step-down (buck) switch-mode voltage regulators. ? 3.3V, 5V, and adjustable output versions The 200kHz MIC4576 duplicates the pinout and function of ? Voltage over speci?ed line and load conditions: the 52kHz LM2576. The higher switching frequency may Fixed version: ?3% max. output voltage allow up to a 2:1 reduction in output ?lter inductor size. Adjustable version: ?2% max. feedback voltage ? Guaranteed 3A switch current The MIC4576 is available in 3.3V, and 5V ?xed output ver- ? Wide 4V to 36V input voltage range sions or a 1.23V to 33V adjustable output version. Both ? Wide 1.23V to 33V output voltage range versions are capable of driving a 3A load with excellent line ? Requires minimum external components and load regulation. ? < 200?A typical shutdown mode The feedback voltage is guaranteed to ?2% tolerance for ? 75% ef?ciency (adjustable version > 75% typical) adjustable versions, and the output voltage is guaranteed to ? Standard inductors are 25% of typical LM2576 values ?3% for ?xed versions, within speci?ed voltages and load con- ? Thermal shutdown ditions. The oscillator frequency is guaranteed to ?10%. ? Overcurrent protection In shutdown mode, the regulator draws less than 200?A ? 100% electrical thermal limit burn-in standby current. The regulator performs cycle-by-cycle Applications current limiting and thermal shutdown for protection under fault conditions. ? Simple high-ef?ciency step-down (buck) regulator ? Ef?cient preregulator for linear regulators This series of simple switch-mode regulators requires a mini- ? On-card switching regulators mum number of external components and can operate using ? Positive-to-negative converter (inverting buck-boost) a standard series of inductors. Frequency compensation is ? Battery Charger provided internally. ? Negative boost converter The MIC4576 is available in TO-220 (T) and TO-263 (U) ? Step-down to 3.3V for Intel Pentium? packages for the industrial temperature range. and similar microprocessors Typical Applications L1 5V/3A 5 2 Shutdown SHDN SW Enable 33?H MIC4576-5.0WT 8V to 36V 1 4 C2 V FB IN 1000?F C1 GND 16V D1 470?F 3 MBR360 63V Fixed Regulator L1 12V/3A 5 2 Shutdown SHDN SW Enable 68?H R2 MIC4576WT 13.0k 16V to 36V 4 1 C2 1% V FB IN 1000?F C1 GND R1 16V 470?F MBR360 1.50k 3 63V 1% Adjustable Regulator Micrel, Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com March 2006 1 MIC4576MIC4576 Micrel, Inc. Ordering Information Standard RoHS Compliant Part Number Part Number* Voltage Temperature Range Package MIC4576-3.3BT MIC4576-3.3WT 3.3V ?40?C to +85?C TO-220-5 MIC4576-5.0BT MIC4576-5.0WT 5.0V ?40?C to +85?C TO-220-5 MIC4576BT MIC4576WT ADJ. ?40?C to +85?C TO-220-5 MIC4576-3.3BU MIC4576-3.3WU 3.3V ?40?C to +85?C TO-263-5 MIC4576-5.0BU MIC4576-5.0WU 5.0V ?40?C to +85?C TO-263-5 MIC4576BU MIC4576WU ADJ. ?40?C to +85?C TO-263-5 * RoHS compliant with "high-melting solder" exemption. Pin Con?guration 5 SHDN 4 FB 3 GND 2 SW 1 V IN 5-Pin TO-220 (T) 5 SHDN 4 FB 3 GND 2 SW 1 V IN 5-Pin TO-263 (U) Pin Description Pin Number Pin Name Pin Function 1 V Supply Voltage (Input): Unregulated +4V to +36V supply voltage. IN 2 SW Switch (Output): Emitter of NPN output switch. Connect to external storage inductor and Shottky diode. 3, TAB GND Ground 4 FB Feedback (Input): Output voltage feedback to regulator. Connect to output of supply for ?xed versions. Connect to 1.23V tap of resistive divider for adjustable versions. 5 SHDN Shutdown (Input): Logic low enables regulator. Logic high (> 2.4V) shuts down regulator. MIC4576 2 March 2006 TAB TABMIC4576 Micrel, Inc. MIC4576 200kHz Simple 3A Buck Regulator General Description Features The MIC4576 is a series of easy to use ?xed and adjustable ? Fixed 200kHz operation BiCMOS step-down (buck) switch-mode voltage regulators. ? 3.3V, 5V, and adjustable output versions The 200kHz MIC4576 duplicates the pinout and function of ? Voltage over speci?ed line and load conditions: the 52kHz LM2576. The higher switching frequency may Fixed version: ?3% max. output voltage allow up to a 2:1 reduction in output ?lter inductor size. Adjustable version: ?2% max. feedback voltage ? Guaranteed 3A switch current The MIC4576 is available in 3.3V, and 5V ?xed output ver- ? Wide 4V to 36V input voltage range sions or a 1.23V to 33V adjustable output version. Both ? Wide 1.23V to 33V output voltage range versions are capable of driving a 3A load with excellent line ? Requires minimum external components and load regulation. ? < 200?A typical shutdown mode The feedback voltage is guaranteed to ?2% tolerance for ? 75% ef?ciency (adjustable version > 75% typical) adjustable versions, and the output voltage is guaranteed to ? Standard inductors are 25% of typical LM2576 values ?3% for ?xed versions, within speci?ed voltages and load con- ? Thermal shutdown ditions. The oscillator frequency is guaranteed to ?10%. ? Overcurrent protection In shutdown mode, the regulator draws less than 200?A ? 100% electrical thermal limit burn-in standby current. The regulator performs cycle-by-cycle Applications current limiting and thermal shutdown for protection under fault conditions. ? Simple high-ef?ciency step-down (buck) regulator ? Ef?cient preregulator for linear regulators This series of simple switch-mode regulators requires a mini- ? On-card switching regulators mum number of external components and can operate using ? Positive-to-negative converter (inverting buck-boost) a standard series of inductors. Frequency compensation is ? Battery Charger provided internally. ? Negative boost converter The MIC4576 is available in TO-220 (T) and TO-263 (U) ? Step-down to 3.3V for Intel Pentium? packages for the industrial temperature range. and similar microprocessors Typical Applications L1 5V/3A 5 2 Shutdown SHDN SW Enable 33?H MIC4576-5.0WT 8V to 36V 1 4 C2 V FB IN 1000?F C1 GND 16V D1 470?F 3 MBR360 63V Fixed Regulator L1 12V/3A 5 2 Shutdown SHDN SW Enable 68?H R2 MIC4576WT 13.0k 16V to 36V 4 1 C2 1% V FB IN 1000?F C1 GND R1 16V 470?F MBR360 1.50k 3 63V 1% Adjustable Regulator Micrel, Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com March 2006 1 MIC4576MIC4576 Micrel, Inc. MIC4576 200kHz Simple 3A Buck Regulator General Description Features The MIC4576 is a series of easy to use ?xed and adjustable ? Fixed 200kHz operation BiCMOS step-down (buck) switch-mode voltage regulators. ? 3.3V, 5V, and adjustable output versions The 200kHz MIC4576 duplicates the pinout and function of ? Voltage over speci?ed line and load conditions: the 52kHz LM2576. The higher switching frequency may Fixed version: ?3% max. output voltage allow up to a 2:1 reduction in output ?lter inductor size. Adjustable version: ?2% max. feedback voltage ? Guaranteed 3A switch current The MIC4576 is available in 3.3V, and 5V ?xed output ver- ? Wide 4V to 36V input voltage range sions or a 1.23V to 33V adjustable output version. Both ? Wide 1.23V to 33V output voltage range versions are capable of driving a 3A load with excellent line ? Requires minimum external components and load regulation. ? < 200?A typical shutdown mode The feedback voltage is guaranteed to ?2% tolerance for ? 75% ef?ciency (adjustable version > 75% typical) adjustable versions, and the output voltage is guaranteed to ? Standard inductors are 25% of typical LM2576 values ?3% for ?xed versions, within speci?ed voltages and load con- ? Thermal shutdown ditions. The oscillator frequency is guaranteed to ?10%. ? Overcurrent protection In shutdown mode, the regulator draws less than 200?A ? 100% electrical thermal limit burn-in standby current. The regulator performs cycle-by-cycle Applications current limiting and thermal shutdown for protection under fault conditions. ? Simple high-ef?ciency step-down (buck) regulator ? Ef?cient preregulator for linear regulators This series of simple switch-mode regulators requires a mini- ? On-card switching regulators mum number of external components and can operate using ? Positive-to-negative converter (inverting buck-boost) a standard series of inductors. Frequency compensation is ? Battery Charger provided internally. ? Negative boost converter The MIC4576 is available in TO-220 (T) and TO-263 (U) ? Step-down to 3.3V for Intel Pentium? packages for the industrial temperature range. and similar microprocessors Typical Applications L1 5V/3A 5 2 Shutdown SHDN SW Enable 33?H MIC4576-5.0WT 8V to 36V 1 4 C2 V FB IN 1000?F C1 GND 16V D1 470?F 3 MBR360 63V Fixed Regulator L1 12V/3A 5 2 Shutdown SHDN SW Enable 68?H R2 MIC4576WT 13.0k 16V to 36V 4 1 C2 1% V FB IN 1000?F C1 GND R1 16V 470?F MBR360 1.50k 3 63V 1% Adjustable Regulator Micrel, Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com March 2006 1 MIC4576MIC4576 Micrel, Inc. Ordering Information Standard RoHS Compliant Part Number Part Number* Voltage Temperature Range Package MIC4576-3.3BT MIC4576-3.3WT 3.3V ?40?C to +85?C TO-220-5 MIC4576-5.0BT MIC4576-5.0WT 5.0V ?40?C to +85?C TO-220-5 MIC4576BT MIC4576WT ADJ. ?40?C to +85?C TO-220-5 MIC4576-3.3BU MIC4576-3.3WU 3.3V ?40?C to +85?C TO-263-5 MIC4576-5.0BU MIC4576-5.0WU 5.0V ?40?C to +85?C TO-263-5 MIC4576BU MIC4576WU ADJ. ?40?C to +85?C TO-263-5 * RoHS compliant with "high-melting solder" exemption. Pin Con?guration 5 SHDN 4 FB 3 GND 2 SW 1 V IN 5-Pin TO-220 (T) 5 SHDN 4 FB 3 GND 2 SW 1 V IN 5-Pin TO-263 (U) Pin Description Pin Number Pin Name Pin Function 1 V Supply Voltage (Input): Unregulated +4V to +36V supply voltage. IN 2 SW Switch (Output): Emitter of NPN output switch. Connect to external storage inductor and Shottky diode. 3, TAB GND Ground 4 FB Feedback (Input): Output voltage feedback to regulator. Connect to output of supply for ?xed versions. Connect to 1.23V tap of resistive divider for adjustable versions. 5 SHDN Shutdown (Input): Logic low enables regulator. Logic high (> 2.4V) shuts down regulator. MIC4576 2 March 2006 TAB TABMIC4576 Micrel, Inc. Absolute Maximum Ratings Operating Ratings Supply Voltage (V ) ....................................................+40V Supply Voltage (V ) ....................................................+36V IN IN Shutdown Voltage (V ) ............................?0.3V to +36V Junction Temperature .............................................. +150?C SHDN Output Switch (V ), Steady State ............................... ?1V Package Thermal Resistance SW TO-220, TO-263 (? ) .........................................65?C/W Feedback Voltage (V ) [Adjustable] .........................+3.8V JA FB TO-220, TO-263 (? ) ............................................2?C/W JC Storage Temperature ................................ ?65?C to +150?C Electrical Characteristics V = 12V; I = 500mA; T = 25?C, bold values indicate ?40?C ? T ? +85?C; unless noted. IN LOAD J J Parameter Condition Min Typ Max Units MIC4576 [Adjustable] Feedback Voltage 1.217 1.230 1.243 V Feedback Voltage 8V ? V ? 36V, 0.5A ? I ? 3A 1.193 1.230 1.267 V IN LOAD 1.180 1.280 V Ef?ciency I = 3A, Note 1 77 % LOAD Maximum Duty Cycle (On) V = 1.0V 90 95 % FB Output Leakage Current V = 36V, V = 1.5V IN FB output = 0V 0 2 mA output = ?1V 7.5 35 mA Quiescent Current V = 1.5V 5 10 mA FB Feedback Bias Current 50 100 nA 500 nA MIC4576-3.3 Output Voltage 3.234 3.3 3.366 V Output Voltage 6V ? V ? 36V, 0.5A ? I ? 3A 3.168 3.3 3.432 V IN LOAD 3.135 3.465 V Ef?ciency I = 3A 72 % LOAD Maximum Duty Cycle (On) V = 2.5V 90 95 % FB Output Leakage Current V = 36V, V = 4.0V IN FB output = 0V 0 2 mA output = ?1V 7.5 35 mA Quiescent Current V = 4.0V 5 10 mA FB MIC4576-5.0 Output Voltage 4.900 5.0 5.100 V Output Voltage 8V ? V ? 36V, 0.5A ? I ? 3A 4.800 5.0 5.200 V IN LOAD 4.750 5.250 V Ef?ciency I = 3A 77 % LOAD Maximum Duty Cycle (On) V = 4.0V 90 95 % FB Output Leakage Current V = 36V, V = 6.0V IN FB output = 0V 0 2 mA output = ?1V 7.5 35 mA Quiescent Current V = 6.0V 5 10 mA FB March 2006 3 MIC4576MIC4576 Micrel, Inc. MIC4576 200kHz Simple 3A Buck Regulator General Description Features The MIC4576 is a series of easy to use ?xed and adjustable ? Fixed 200kHz operation BiCMOS step-down (buck) switch-mode voltage regulators. ? 3.3V, 5V, and adjustable output versions The 200kHz MIC4576 duplicates the pinout and function of ? Voltage over speci?ed line and load conditions: the 52kHz LM2576. The higher switching frequency may Fixed version: ?3% max. output voltage allow up to a 2:1 reduction in output ?lter inductor size. Adjustable version: ?2% max. feedback voltage ? Guaranteed 3A switch current The MIC4576 is available in 3.3V, and 5V ?xed output ver- ? Wide 4V to 36V input voltage range sions or a 1.23V to 33V adjustable output version. Both ? Wide 1.23V to 33V output voltage range versions are capable of driving a 3A load with excellent line ? Requires minimum external components and load regulation. ? < 200?A typical shutdown mode The feedback voltage is guaranteed to ?2% tolerance for ? 75% ef?ciency (adjustable version > 75% typical) adjustable versions, and the output voltage is guaranteed to ? Standard inductors are 25% of typical LM2576 values ?3% for ?xed versions, within speci?ed voltages and load con- ? Thermal shutdown ditions. The oscillator frequency is guaranteed to ?10%. ? Overcurrent protection In shutdown mode, the regulator draws less than 200?A ? 100% electrical thermal limit burn-in standby current. The regulator performs cycle-by-cycle Applications current limiting and thermal shutdown for protection under fault conditions. ? Simple high-ef?ciency step-down (buck) regulator ? Ef?cient preregulator for linear regulators This series of simple switch-mode regulators requires a mini- ? On-card switching regulators mum number of external components and can operate using ? Positive-to-negative converter (inverting buck-boost) a standard series of inductors. Frequency compensation is ? Battery Charger provided internally. ? Negative boost converter The MIC4576 is available in TO-220 (T) and TO-263 (U) ? Step-down to 3.3V for Intel Pentium? packages for the industrial temperature range. and similar microprocessors Typical Applications L1 5V/3A 5 2 Shutdown SHDN SW Enable 33?H MIC4576-5.0WT 8V to 36V 1 4 C2 V FB IN 1000?F C1 GND 16V D1 470?F 3 MBR360 63V Fixed Regulator L1 12V/3A 5 2 Shutdown SHDN SW Enable 68?H R2 MIC4576WT 13.0k 16V to 36V 4 1 C2 1% V FB IN 1000?F C1 GND R1 16V 470?F MBR360 1.50k 3 63V 1% Adjustable Regulator Micrel, Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com March 2006 1 MIC4576MIC4576 Micrel, Inc. MIC4576 200kHz Simple 3A Buck Regulator General Description Features The MIC4576 is a series of easy to use ?xed and adjustable ? Fixed 200kHz operation BiCMOS step-down (buck) switch-mode voltage regulators. ? 3.3V, 5V, and adjustable output versions The 200kHz MIC4576 duplicates the pinout and function of ? Voltage over speci?ed line and load conditions: the 52kHz LM2576. The higher switching frequency may Fixed version: ?3% max. output voltage allow up to a 2:1 reduction in output ?lter inductor size. Adjustable version: ?2% max. feedback voltage ? Guaranteed 3A switch current The MIC4576 is available in 3.3V, and 5V ?xed output ver- ? Wide 4V to 36V input voltage range sions or a 1.23V to 33V adjustable output version. Both ? Wide 1.23V to 33V output voltage range versions are capable of driving a 3A load with excellent line ? Requires minimum external components and load regulation. ? < 200?A typical shutdown mode The feedback voltage is guaranteed to ?2% tolerance for ? 75% ef?ciency (adjustable version > 75% typical) adjustable versions, and the output voltage is guaranteed to ? Standard inductors are 25% of typical LM2576 values ?3% for ?xed versions, within speci?ed voltages and load con- ? Thermal shutdown ditions. The oscillator frequency is guaranteed to ?10%. ? Overcurrent protection In shutdown mode, the regulator draws less than 200?A ? 100% electrical thermal limit burn-in standby current. The regulator performs cycle-by-cycle Applications current limiting and thermal shutdown for protection under fault conditions. ? Simple high-ef?ciency step-down (buck) regulator ? Ef?cient preregulator for linear regulators This series of simple switch-mode regulators requires a mini- ? On-card switching regulators mum number of external components and can operate using ? Positive-to-negative converter (inverting buck-boost) a standard series of inductors. Frequency compensation is ? Battery Charger provided internally. ? Negative boost converter The MIC4576 is available in TO-220 (T) and TO-263 (U) ? Step-down to 3.3V for Intel Pentium? packages for the industrial temperature range. and similar microprocessors Typical Applications L1 5V/3A 5 2 Shutdown SHDN SW Enable 33?H MIC4576-5.0WT 8V to 36V 1 4 C2 V FB IN 1000?F C1 GND 16V D1 470?F 3 MBR360 63V Fixed Regulator L1 12V/3A 5 2 Shutdown SHDN SW Enable 68?H R2 MIC4576WT 13.0k 16V to 36V 4 1 C2 1% V FB IN 1000?F C1 GND R1 16V 470?F MBR360 1.50k 3 63V 1% Adjustable Regulator Micrel, Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com March 2006 1 MIC4576MIC4576 Micrel, Inc. Ordering Information Standard RoHS Compliant Part Number Part Number* Voltage Temperature Range Package MIC4576-3.3BT MIC4576-3.3WT 3.3V ?40?C to +85?C TO-220-5 MIC4576-5.0BT MIC4576-5.0WT 5.0V ?40?C to +85?C TO-220-5 MIC4576BT MIC4576WT ADJ. ?40?C to +85?C TO-220-5 MIC4576-3.3BU MIC4576-3.3WU 3.3V ?40?C to +85?C TO-263-5 MIC4576-5.0BU MIC4576-5.0WU 5.0V ?40?C to +85?C TO-263-5 MIC4576BU MIC4576WU ADJ. ?40?C to +85?C TO-263-5 * RoHS compliant with "high-melting solder" exemption. Pin Con?guration 5 SHDN 4 FB 3 GND 2 SW 1 V IN 5-Pin TO-220 (T) 5 SHDN 4 FB 3 GND 2 SW 1 V IN 5-Pin TO-263 (U) Pin Description Pin Number Pin Name Pin Function 1 V Supply Voltage (Input): Unregulated +4V to +36V supply voltage. IN 2 SW Switch (Output): Emitter of NPN output switch. Connect to external storage inductor and Shottky diode. 3, TAB GND Ground 4 FB Feedback (Input): Output voltage feedback to regulator. Connect to output of supply for ?xed versions. Connect to 1.23V tap of resistive divider for adjustable versions. 5 SHDN Shutdown (Input): Logic low enables regulator. Logic high (> 2.4V) shuts down regulator. MIC4576 2 March 2006 TAB TABMIC4576 Micrel, Inc. MIC4576 200kHz Simple 3A Buck Regulator General Description Features The MIC4576 is a series of easy to use ?xed and adjustable ? Fixed 200kHz operation BiCMOS step-down (buck) switch-mode voltage regulators. ? 3.3V, 5V, and adjustable output versions The 200kHz MIC4576 duplicates the pinout and function of ? Voltage over speci?ed line and load conditions: the 52kHz LM2576. The higher switching frequency may Fixed version: ?3% max. output voltage allow up to a 2:1 reduction in output ?lter inductor size. Adjustable version: ?2% max. feedback voltage ? Guaranteed 3A switch current The MIC4576 is available in 3.3V, and 5V ?xed output ver- ? Wide 4V to 36V input voltage range sions or a 1.23V to 33V adjustable output version. Both ? Wide 1.23V to 33V output voltage range versions are capable of driving a 3A load with excellent line ? Requires minimum external components and load regulation. ? < 200?A typical shutdown mode The feedback voltage is guaranteed to ?2% tolerance for ? 75% ef?ciency (adjustable version > 75% typical) adjustable versions, and the output voltage is guaranteed to ? Standard inductors are 25% of typical LM2576 values ?3% for ?xed versions, within speci?ed voltages and load con- ? Thermal shutdown ditions. The oscillator frequency is guaranteed to ?10%. ? Overcurrent protection In shutdown mode, the regulator draws less than 200?A ? 100% electrical thermal limit burn-in standby current. The regulator performs cycle-by-cycle Applications current limiting and thermal shutdown for protection under fault conditions. ? Simple high-ef?ciency step-down (buck) regulator ? Ef?cient preregulator for linear regulators This series of simple switch-mode regulators requires a mini- ? On-card switching regulators mum number of external components and can operate using ? Positive-to-negative converter (inverting buck-boost) a standard series of inductors. Frequency compensation is ? Battery Charger provided internally. ? Negative boost converter The MIC4576 is available in TO-220 (T) and TO-263 (U) ? Step-down to 3.3V for Intel Pentium? packages for the industrial temperature range. and similar microprocessors Typical Applications L1 5V/3A 5 2 Shutdown SHDN SW Enable 33?H MIC4576-5.0WT 8V to 36V 1 4 C2 V FB IN 1000?F C1 GND 16V D1 470?F 3 MBR360 63V Fixed Regulator L1 12V/3A 5 2 Shutdown SHDN SW Enable 68?H R2 MIC4576WT 13.0k 16V to 36V 4 1 C2 1% V FB IN 1000?F C1 GND R1 16V 470?F MBR360 1.50k 3 63V 1% Adjustable Regulator Micrel, Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com March 2006 1 MIC4576MIC4576 Micrel, Inc. MIC4576 200kHz Simple 3A Buck Regulator General Description Features The MIC4576 is a series of easy to use ?xed and adjustable ? Fixed 200kHz operation BiCMOS step-down (buck) switch-mode voltage regulators. ? 3.3V, 5V, and adjustable output versions The 200kHz MIC4576 duplicates the pinout and function of ? Voltage over speci?ed line and load conditions: the 52kHz LM2576. The higher switching frequency may Fixed version: ?3% max. output voltage allow up to a 2:1 reduction in output ?lter inductor size. Adjustable version: ?2% max. feedback voltage ? Guaranteed 3A switch current The MIC4576 is available in 3.3V, and 5V ?xed output ver- ? Wide 4V to 36V input voltage range sions or a 1.23V to 33V adjustable output version. Both ? Wide 1.23V to 33V output voltage range versions are capable of driving a 3A load with excellent line ? Requires minimum external components and load regulation. ? < 200?A typical shutdown mode The feedback voltage is guaranteed to ?2% tolerance for ? 75% ef?ciency (adjustable version > 75% typical) adjustable versions, and the output voltage is guaranteed to ? Standard inductors are 25% of typical LM2576 values ?3% for ?xed versions, within speci?ed voltages and load con- ? Thermal shutdown ditions. The oscillator frequency is guaranteed to ?10%. ? Overcurrent protection In shutdown mode, the regulator draws less than 200?A ? 100% electrical thermal limit burn-in standby current. The regulator performs cycle-by-cycle Applications current limiting and thermal shutdown for protection under fault conditions. ? Simple high-ef?ciency step-down (buck) regulator ? Ef?cient preregulator for linear regulators This series of simple switch-mode regulators requires a mini- ? On-card switching regulators mum number of external components and can operate using ? Positive-to-negative converter (inverting buck-boost) a standard series of inductors. Frequency compensation is ? Battery Charger provided internally. ? Negative boost converter The MIC4576 is available in TO-220 (T) and TO-263 (U) ? Step-down to 3.3V for Intel Pentium? packages for the industrial temperature range. and similar microprocessors Typical Applications L1 5V/3A 5 2 Shutdown SHDN SW Enable 33?H MIC4576-5.0WT 8V to 36V 1 4 C2 V FB IN 1000?F C1 GND 16V D1 470?F 3 MBR360 63V Fixed Regulator L1 12V/3A 5 2 Shutdown SHDN SW Enable 68?H R2 MIC4576WT 13.0k 16V to 36V 4 1 C2 1% V FB IN 1000?F C1 GND R1 16V 470?F MBR360 1.50k 3 63V 1% Adjustable Regulator Micrel, Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com March 2006 1 MIC4576MIC4576 Micrel, Inc. Ordering Information Standard RoHS Compliant Part Number Part Number* Voltage Temperature Range Package MIC4576-3.3BT MIC4576-3.3WT 3.3V ?40?C to +85?C TO-220-5 MIC4576-5.0BT MIC4576-5.0WT 5.0V ?40?C to +85?C TO-220-5 MIC4576BT MIC4576WT ADJ. ?40?C to +85?C TO-220-5 MIC4576-3.3BU MIC4576-3.3WU 3.3V ?40?C to +85?C TO-263-5 MIC4576-5.0BU MIC4576-5.0WU 5.0V ?40?C to +85?C TO-263-5 MIC4576BU MIC4576WU ADJ. ?40?C to +85?C TO-263-5 * RoHS compliant with "high-melting solder" exemption. Pin Con?guration 5 SHDN 4 FB 3 GND 2 SW 1 V IN 5-Pin TO-220 (T) 5 SHDN 4 FB 3 GND 2 SW 1 V IN 5-Pin TO-263 (U) Pin Description Pin Number Pin Name Pin Function 1 V Supply Voltage (Input): Unregulated +4V to +36V supply voltage. IN 2 SW Switch (Output): Emitter of NPN output switch. Connect to external storage inductor and Shottky diode. 3, TAB GND Ground 4 FB Feedback (Input): Output voltage feedback to regulator. Connect to output of supply for ?xed versions. Connect to 1.23V tap of resistive divider for adjustable versions. 5 SHDN Shutdown (Input): Logic low enables regulator. Logic high (> 2.4V) shuts down regulator. MIC4576 2 March 2006 TAB TABMIC4576 Micrel, Inc. Absolute Maximum Ratings Operating Ratings Supply Voltage (V ) ....................................................+40V Supply Voltage (V ) ....................................................+36V IN IN Shutdown Voltage (V ) ............................?0.3V to +36V Junction Temperature .............................................. +150?C SHDN Output Switch (V ), Steady State ............................... ?1V Package Thermal Resistance SW TO-220, TO-263 (? ) .........................................65?C/W Feedback Voltage (V ) [Adjustable] .........................+3.8V JA FB TO-220, TO-263 (? ) ............................................2?C/W JC Storage Temperature ................................ ?65?C to +150?C Electrical Characteristics V = 12V; I = 500mA; T = 25?C, bold values indicate ?40?C = T = +85?C; unless noted. IN LOAD J J Parameter Condition Min Typ Max Units MIC4576 [Adjustable] Feedback Voltage 1.217 1.230 1.243 V Feedback Voltage 8V = V = 36V, 0.5A = I = 3A 1.193 1.230 1.267 V IN LOAD 1.180 1.280 V Ef?ciency I = 3A, Note 1 77 % LOAD Maximum Duty Cycle (On) V = 1.0V 90 95 % FB Output Leakage Current V = 36V, V = 1.5V IN FB output = 0V 0 2 mA output = ?1V 7.5 35 mA Quiescent Current V = 1.5V 5 10 mA FB Feedback Bias Current 50 100 nA 500 nA MIC4576-3.3 Output Voltage 3.234 3.3 3.366 V Output Voltage 6V = V = 36V, 0.5A = I = 3A 3.168 3.3 3.432 V IN LOAD 3.135 3.465 V Ef?ciency I = 3A 72 % LOAD Maximum Duty Cycle (On) V = 2.5V 90 95 % FB Output Leakage Current V = 36V, V = 4.0V IN FB output = 0V 0 2 mA output = ?1V 7.5 35 mA Quiescent Current V = 4.0V 5 10 mA FB MIC4576-5.0 Output Voltage 4.900 5.0 5.100 V Output Voltage 8V = V = 36V, 0.5A = I = 3A 4.800 5.0 5.200 V IN LOAD 4.750 5.250 V Ef?ciency I = 3A 77 % LOAD Maximum Duty Cycle (On) V = 4.0V 90 95 % FB Output Leakage Current V = 36V, V = 6.0V IN FB output = 0V 0 2 mA output = ?1V 7.5 35 mA Quiescent Current V = 6.0V 5 10 mA FB March 2006 3 MIC4576

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8542.31.00 51 No ..Application Specific (Digital) Integrated Circuits (ASIC)

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