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| Homepage > Products > Micrel's Switching Regulators |
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 Switch Mode Regulators PDF |
 Buck and Synchronous Buck Regulators (Internal FETs) |
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Data Sheet |
Device | Input Voltage (V) | Output Current | Vout Range (V) | Fixed Vout options | Frequency | Features | Package(s) | Inventory |
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4 to 40 | 0.5A | 1.23 - 37 | 3.3V, 5.0V, 12V | 52kHz | DIP-8 | |||
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4 to 40 | 1A | 1.23 - 37 | 3.3V, 5.0V, 12V | 52kHz | TO-220-5, TO-263-5, DIP-16, SOP-24 | |||
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LM2576 | 4 to 40 | 3A | 1.23 - 37 | 3.3V, 5.0V, 12V | 52kHz | TO-220-5, TO-263-5 | ||
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MIC2177 | 4.5 to 16.5 | 2.5A | 1.25 - 12 | 3.3V, 5.0V | 200kHz | Auto skip mode | SOP-20 | |
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MIC2178 | 4.5 to 16.5 | 2.5A | 1.25 - 12 | 3.3V, 5.0V | 200kHz | Manual skip | SOP-20 | |
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MIC2179 | 4.5 to 16.5 | 1.5A | 1.25 - 12 | 3.3V, 5.0V | 200kHz | Small package | SSOP-20 | |
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MIC2202 | 2.3 to 5.5 | 0.6A | 0.5V to Vin | Adj | 2MHz | Stable with 1uF COUT | 3x3mm MLF-10L, MSOP-10 | |
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MIC2203 | 2.3 to 5.5 | 300mA | Adj down to 0.5V | Adj | 1MHz | 3x3mm MLF-10L, MSOP-10 | ||
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MIC2204 | 2.3 to 5.5 | 0.6A | 1.0 - Vin | Adj. | 2MHz | 95% Efficient | 3x3mm MLF-10L, MSOP-10 | |
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MIC2205 | 2.7 to 5.5 | 600mA | Adj down to 1.0V | 1.3V, 1.38V, 1.5V, 1.58V, 1.8V, 1.85V& Adj | 2MHz | LOWQ Mode | 3x3mm MLF-10L | |
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MIC2206 | 2.7 to 5.5 | 600mA | 1.2V/1.0V, 1.8V/1.0V | 2MHz | LOWQ™ & Voltage Scaling | 3x3mm MLF-10L | ||
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MIC2207 | 2.7 to 5.5 | 3A | Adj down to 1.0V | Adj. | 2MHz | 12-Ld 3x3MLF | ||
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MIC2208 | 2.7 to 5.5 | 3A | Adj down to 1.0V | Adj. | 1MHz | 12-Ld 3x3MLF | ||
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MIC22200 | 2.6 to 5.5 | 2A | Adj. down to .7 V | 800kHz up to 4MHz | Full sequencing and tracking, Easy RC compensation, Power on Reset | 3x3mm MLF-12 | ||
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MIC2238 | 2.5 to 5.5 | 800/ 800mA |
Adj. down to .8 V | 4MHz | Trickle Mode™ | 3x3mm MLF-12L | ||
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MIC22400 | 2.6 to 5.5 | 4A | 0.7-5V | 800khz to 4 MHz | Full Sequensing and Tracking, Easy RC compensation, Power on Reset |
20 PIN 3X4 mmMLF®, e TSSOP-20 |
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MIC2245 | 2.7 to 5.5 | 500mA | Adj. down to 1.0V | 4MHz | LOWQ Mode | 3x3mm MLF-10L | ||
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MIC22600 | 2.6 to 5.5 | 6A | Adj down to .7V | 1MHz | Full sequencing and tracking ability | 4x4mm MLF 24-Pin | ||
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MIC22601 -- NEW -- |
2.6 to 5.5 | 6A | Adj. down to .7 V | 4MHz | High PWM frequency/High efficiency | 4x4mm MLF 24-Pin | ||
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MIC22602 -- NEW -- |
2.6 to 5.5 | 6A | Adj. down to .7 V | 1MHz | Hiccup mode current limiting, High power density | 4x4 MLF-24 | ||
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MIC22700 -- NEW -- |
2.6 to 5.5 | 7A | Adj. down to .7 V | 1MHz | Very high efficiency, Integrated switches | 4mm x 4mm MLF-24L | ||
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MIC22950 -- NEW -- |
2.6 to 5.5 | 10A | Adj. down to .7 V | 400kHz to 2MHz | High power density, High efficiency | 5mm x 5mm MLF-32L | ||
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MIC2285 | 2.7 to 5.5 | 500mA | Adj down to 1.0V | 8MHz | LOWQ Mode | 3x3mm MLF-10L | ||
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MIC2285A | 2.7 to 5.5 | 600mA | Adj down to 1.0V | 8MHz | LOWQ Mode | 2x2mm MLF-10L | ||
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MIC23030 | 2.7 to 5.5 | 400mA | Adj down to 0.7V | 1.0V, 1.2V,1.5V, 1.8V | 8MHz | HyperLight Load™ | 1.6x1.6mm MLF-6L | |
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MIC23031 | 2.7 to 5.5 | 400mA | Adj down to 0.7V | 1.0V, 1.2V,1.5V, 1.8V | 4MHz | HyperLight Load™ | 1.6x1.6mm MLF-6L | |
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MIC23050 | 2.7 to 5.5 | 600mA | 1.2V, 1.8V, 3.3V | 4MHz | HyperLight Load™ | 2x2mm MLF-8L | ||
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MIC23051 | 2.7 to 5.5 | 600mA | 1.8/1.0V, 1.2/1.0V, 1.4/1.15V, 1.25/0.95V | 4MHz | HyperLight Load™, Voltage Scaling |
2x2mm MLF-8L | ||
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MIC23150 | 2.7 to 5.5 | 2.0A | 1.0V, 1.2V, 1.8V, 3.3V |
4MHz | HyperLight Load™ | 2x2mm, MLF-8L |
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MIC23153 | 2.7 to 5.5 | 2.0A | Adj. down to 0.7V | 1.8V | 4MHz | HyperLight Load™, Power Good, Programmable soft-start | 2.5x2.5mm, MLF-10L
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MIC23250 | 2.7 to 5.5 | 400/ 400mA |
Adj down to 0.72V | 1.575V/1.8V, 1.8V/1.2V, 1.0V/1.2V, 1.1V/0.9V, 1.6V/1.2V |
4MHz | HyperLight Load™ | 2x2mm, MLF10 2.5x2.5mm MLF12 |
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MIC23254 |
2.5 to 5.5 | 400/ 400mA |
1.0V/1.8V, |
4MHz | HyperLight Load™, Low Input Voltage | 2x2mm, MLF10 |
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MIC26400- -- NEW -- | 4.5 to 26V | 5A | 0.8V-0.8*Vin | 300kHz | Hyper Speed Control allows Ultra fast Transient response | 5mm x 6mm MLF-28L | ||
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MIC26600- -- NEW -- | 4.5 to 26V | 7A | 0.8V-0.8Vin | 300kHz | Hyper Speed Control allows Ultra fast Transient response | 5mm x 6mm MLF-28L | ||
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MIC26950 -- NEW -- |
4.5 to 26V | 12A | 0.8V-0.8Vin | 300kHz | Hyper Speed Control allows Ultra fast Transient response | 5mm x 6mm MLF-28L | ||
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MIC33030 | 4.5 to 26V | 400/400mA | 0.7V to 3.6V | 1.2V, 1.8V | 8MHz | HyperLight Load™ |
28-Pin 5x6 MLF® | |
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MIC33050 | 2.7 to 5.5 | 600mA | 1.2V, 1.8V, 3.3V | 4MHz | Internal Inductor, HyperLight Load™ | 12-Pin 3x3 MLF | ||
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MIC3385 | 2.7 to 5.5 | 600mA | 0.72 - VIN | 1.5V | 8MHz | Internal Inductor LOWQ Mode | 3x3.5mm MLF-14L | |
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MIC4574 | 4 to 24 | 0.5A | 1.23 - 20 | 3.3V, 5.0V | 200kHz | Smaller inductor than LM257x | DIP-8 | |
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MIC4575 | 4 to 24 | 1A | 1.23 - 20 | 3.3V, 5.0V | 200kHz | Smaller inductor than LM257x | TO-220-5, TO-263-5 | |
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MIC4576 | 4 to 36 | 3A | 1.23 - 33 | 3.3V, 5.0V | 200kHz | Smaller inductor than LM257x | TO-220-5, TO-263-5 | |
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MIC4680 | 4 to 34 | 1.3A | 1.25 - 30 | 3.3V, 5.0V | 200kHz | SuperSwitcher small size | SOP-8 | |
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MIC4681 | 4 to 30 | 1.3A | 1.25 - 30 | 200kHz | 2A peak current | SOP-8 | ||
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MIC4682 | 4 to 34 | 1.3A | 1.25 - 30 | 200Khz | Programmable Current Limit | SOP-8 | ||
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MIC4684 | 4 to 30 | 2A | 1.25 - 30 | 200kHz | High efficiency | SOP-8 | ||
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MIC4685 | 4 to 30 | 3A | 1.25 - 30 | 200kHz | 3A continuous | SPAK-07 | ||
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MIC4690 | 4 to 30 | 1.3A | 1.25 - 30 | 500kHz | Small inductor | SOP-8 | ||
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MIC4720 | 2.7 to 5.5 | 2A | Adj. | 2MHz | MLF-12, EPAD MSOP-10 | |||
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MIC4721 | 2.7 to 5.5 | 1.5A | Adj. | 2MHz | MSOP-10 | |||
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MIC4722 | 2.7 to 5.5 | 3A | Adj. down to 1.0V | Adj. | 2.7MHz | 3x3mm MLF-12L | ||
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MIC4723 | 2.7 to 5.5 | 3A | Adj. | 2MHz | 3x3mm MLF-12L | |||
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MIC4724 | 3 to 6V | 3A | Adj. down to 1.0V | 2MHz | PGOOD, EN, Internal compensation, Integrated 3A switch |
ePAD MSOP-10 | ||
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MIC4742 | 2.9 to 5.5 | 2A | Adj. down to 0.6V | 2MHz | Integrated dual 2A switches, High efficiency |
3mmx3mm MLF-16L and ETSSOP-16 | ||
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MIC4744 | 2.9 to 5.5V | 2A Dual Output | Adj. down to 0.6V | 4MHz | Integrated dual 2A switches, High efficiency |
3mmx3mm MLF-16L and ETSSOP-16 | ||
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MIC4782 |
3.0 to 6.0V | 2A Dual Output | Adj. down to 0.6V | 1.8MHz | Dual channel independent control, High efficiency |
3mm x 3mm MLF-16L | ||
Data Sheet |
Device | Input Voltage (V) | Output Current | Vout Range (V) | Fixed Vout options | Frequency | Features | Package(s) | Inventory |
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MIC2124 NEW! |
3 to 18 | Up to 20A | Adj down to .8V | N/A | 300kHz | High performance, low-cost, small | 10-Pin MSOP |
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MIC2130/31 | 8V to 40V | Up to 15A | Adj down to .7V | Adj | Fixed 150KHz and 400KHz | Adaptive gate drive, Low EMI option | 4x4 MLF-16 and e-TSSOP-16 | |
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MIC2150/1 | 4.5V to 14.5V | 20A per phase | Adj down to 0.7V | 500kHz/300kHz | Dual synch controller with outpus 180º out-of-phase | 4mmx4mm MLF-24 | ||
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MIC2155/56 NEW! |
4.5 to 14.5 | 40A | Adj down to .7V | N/A | 500kHz/ 300kHz |
2-phase, single output controller, High efficiency | 5x5 MLF-32 | |
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MIC2159 | 3 to 14.5 | 30A | 0.8V min | Adj | 400kHz | Small, Simple, Efficienct | ePAD MSOP-10 |
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MIC2164/-2/-3 NEW! |
3 to 28 | Up to 20A | Adj down to .8V | N/A | 300kHz, 600kHz, 1MHz | High performance, low-cost, small | 10-Pin MSOP |
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MIC2165 NEW! | 4.5V to 28V | Up to 25A | Adj down to 0.8V | N/A | 600kHz | Hyper Light LoadTM Efficiency | ePAD MSOP-10 |
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MIC2166 NEW! |
4.5V to 28V | Up to 25A | Adj down to .8V | N/A | 600kHz | Power Good, Internal Regulator | 10-Pin MSOP |
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MIC2168A | 3 to 14.5 | 20A | 0.8V min | Adj | 1MHz | Small, Simple, Fast | MSOP-10 | |
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MIC2169A | 3 to 14.5 | 0.8V min | Adj | 500kHz | Small, Simple, Efficienct | MSOP-10 | ||
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MIC2169B | 3 to 14.5 | Adj - 0.8V | 500kHz | MSOP-10 | ||||
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MIC2174 NEW! |
3 to 40 | 25A | Adj down to .8V | N/A | 300kHz | Hyper Speed Control™ architecture enable |
10-Pin MSOP |
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MIC2182 | 4.5 to 32 | External n-FETs | 1.25 - 6 | 300kHz | SOP-16, SSOP-16 | |||
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MIC2183 | 2.9 to 14 | External n- and p-FETs | 1.25 - VIN | 400/200 kHz | 100% max duty cycle | SOP-16, QSOP-16 | ||
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MIC2184 | 2.9 to 14 | External p-FET | 1.25 - VIN | 400/200 kHz | Buck controller | SOP-16, QSOP-16 | ||
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MIC2193 | 2.9 to 14 | External n- and p-FETs | 1.25 - VIN | 400kHz | Low pin count | SOP-8 | ||
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MIC2194 | 2.9 to 14 | External p-FET | 1.25 - VIN | 400kHz | Low pin count | SOP-8 | ||
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MIC2198 | 4.5 to 32 | 20A | 0.8 - 6 | 500kHz | Fast & Small | 4x4mm MLF-12L | ||
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MIC2199 | 4.5 to 32 | 20A | 0.8 - 6 | 300kHz | Small | 4x4mm MLF-12L | ||
Data Sheet |
Device | Input Voltage (V) | Output Current | Vout Range (V) | Fixed Vout options | Frequency | Features | Package(s) | Inventory |
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MIC2141 | 2.5 to 14 | 0.5A(2) | 3.0 - 22 | 330 kHz | Dynamically adjustable output voltage | SOT-23-5 | ||
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MIC2142 | 2.2 to 16 | 0.5A(2) | 3.0 - 22 | 330 kHz | Small, simple, efficient | SOT-23-5 | ||
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MIC2145 | 2.4 to 16 | 1.5A(2) | 3.0 - 16 | 450 kHz | Programmable peak switch current | MSOP-8 | ||
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MIC2171 | 3 to 40 | 2.5A(2) | 3.3 - 60 | 100kHz | High I(out) | TO-220-5, TO-263-5 | ||
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MIC2172 | 3 to 40 | 1.25A(2) | 3.3 - 60 | 100kHz | Sync pin | DIP-8, SOP-8 | ||
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MIC2250 | 2.5 to 5.5V | 2.0A(2) | VIN to 32V | Up to 2.5MHz | High Light Load Efficiency, Reduced Peak EMI Dither Mode | 2x2mm MLF-8L | ||
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MIC2253 | 2.5 to 10V | 3.5A(2) | VIN to 30V | Adj. | 1MHz | 6V OVP Adjuststable OVP Programmable soft-start | 3x3mm MLF12 | |
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MIC2287 | 2.5 to 10 | 0.5A(2) | VIN to 34V | Adj | 1.2MHz | White LED Driver | Thin SOT23-5L, 2x2mm MLF-8L | |
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MIC2287c | 2.5 to 10 | 0.5A(2) | VIN to 34V | Adj | 1.2MHz | White LED Driver | Thin SOT23-5L, 2x2mm MLF-8L | |
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MIC2288 | 2.5 to 10 | 1A(2) | VIN to 34V | Adj | 1.2MHz | Small and high current | Thin SOT23-5L, 2x2mm MLF-8L | |
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MIC2289 | 2.5 to 10 | 0.5A(2) | VIN to 34V | Adj | 1.2MHz | White LED Driver w/ Internal Schottky Diode | 2x2mm MLF-8L | |
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MIC2290 | 2.5 to 10 | 0.5A(2) | VIN to 34V | Adj | 1.2MHz | Internal Schottky Diode | 2x2mm MLF-8L | |
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MIC2291 | 2.5 to 10 | 1.2A(2) | VIN to 34V | Adj | 1.2MHz | Photo Flash LED Driver | Thin SOT23-5L, 2x2mm MLF-8L | |
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MIC2292 | 2.5 to 10 | 0.5A(2) | VIN to 34V | Adj | 1.6MHz | Internal Schottky Diode, fast | 2x2mm MLF-8L | |
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MIC2293 | 2.5 to 10 | 0.5A(2) | VIN to 34V | Adj | 2MHz | Internal Schottky Diode, fast | 2x2mm MLF-8L | |
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MIC2295 | 2.5 to 10 | 1.2A(2) | 30 - 34 |
1.2 MHz |
High-Power Density |
SOT-23-5 & 2mm x 2mm MLF™-8L |
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MIC2296 | 2.5 to 10 | 1.2A(2) | 30 - 34 |
600 kHz |
High-Power Density |
SOT-23-5 & 2mm x 2mm MLF™-8L |
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MIC2297 | 2.5 to 10 | 1.2A(2) | 15 - 40 |
600 kHz |
White LED Driver |
2.5mm x 2.5mm MLF™-10L |
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MIC2299 NEW! | 2.5 to 10 |
3.5A(2) | VIN – 30V |
Adj | 2MHz | HB White LED Driver | 3x3mm MLF12 |
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MIC2570 | 1.3 to 15 | 1A(2) | 1.5 - 33 | 2.85V, 3.3V, 5.0V | 20kHz | SOP-8 | ||
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MIC2571 | 0.9 to 15 | 1A(2) | 1.1 - 33 | 2.85V, 3.3V, 5.0V | 20kHz | MSOP-8 | ||
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MIC2601 MIC2602 |
4.5 to 20 | 1.2A(2) | Adj to 40V | 1.2/2MHz | En/SS/Internal comp |
8-pin 2x2mm MLF® |
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MIC2605 MIC2606 |
4.5 to 20 | .5A(2) | Adj to 40V | 1.2/2MHz | En/SS/Internal comp |
8-pin 2x2mm MLF® |
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MIC2619 NEW! |
2.8 to 6.5 | 350mA | Adj to 35V | 1.2MHz | Programmable OVP, SS/EN | Thin SOT-23-6L | ||
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MIC3172 | 3 to 40 | 1.25A(2) | 3.3 - 60 | 100kHz | Shutdown pin | DIP-8, SOP-8 | ||
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MIC3287 | 2.8 to 5.5 | 0.35A | Vin to 24V | 1.2MHz | White LED Driver | Thin SOT23-5L / -6L, 2x2mm MLF-8L | ||
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MIC3289 NEW! | 2.5 to 6.5 | 1.2A(2) | Vin to 24V | Adj |
1.2MHz | White LED with True 1-wire Digital Control |
Thin SOT-23 & |
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Data Sheet |
Device | Input Voltage (V) | Output Current | Vout Range (V) | Frequency | Features | Package(s) | Inventory |
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MIC2185 | 2.9 to 14 | External n- and p-FETs | 3.3 - 14 | 200/400 kHz | High Efficiency Synchonous Boost | SOP-16, QSOP-16 | |
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MIC2186 | 2.9 to 14 | External n-FET | 3.3 to application limit | 100/200/400 kHz | High power 1.6 ohm MOSFET driver | SOP-16, QSOP-16 | |
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MIC2196 | 2.9 to 14 | External n-FETs | 3.3 to application limit | 400kHz | Low pin count | SOP-8 | |
Data Sheet |
Device | Input Voltage (V) | Output Current | Vout Range (V) | Frequency | Features | Package(s) | Inventory |
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MIC3808 | 8.3 to 20 | External FET | Adjustable | up to 1MHz | Push-Pull controller | SOP-8, MSOP-8 | |
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MIC3809 | 4.1 to 20 | External FET | Adjustable | up to 1MHz | Push-Pull controller | SOP-8, MSOP-8 | |
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MIC3838 | 8.3 to 20 | External FET | Adjustable | up to 1MHz | Flexible voltage- or current-mode Push-Pull controller | MSOP-10 | |
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MIC3839 | 4.1 to 20 | External FET | Adjustable | up to 1MHz | Flexible voltage- or current-mode Push-Pull controller | MSOP-10 | |
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9 to 20 | External FET | Adjustable | up to 500kHz | Low power BiCMOS version of UC384x, 0.5A output drive | DIP-8, DIP-14, SOP-8, SOP-14, MSOP-8 | ||
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MIC38C4xA | 9 to 20 | External FET | Adjustable | up to 500kHz | Reccomended for new designs, 0.5A output drive | SOP-8, MSOP-8 | |
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MIC38HC4x | 9 to 20 | External FET | Adjustable | up to 500kHz | Lower power BiCMOS version of UC384x, 1.0A output drive | DIP-8, DIP-14, SOP-8, SOP-14 | |
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MIC9130 | 9 to 180V | External FET | Adjustable | up to 1.5MHz output | Internal 180V start-up circuitry. 50% max duty cycle | SOP-16, QSOP-16 | |
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MIC9131 | 9 to 180V | External FET | Adjustable | up to 1MHz output | Internal 180V start-up circuitry. 75% max duty cycle | SOP-16, QSOP-16 | |
| 1 NEW! Featured product |
| 2 Maximum switch current |
Design Software |
 Micrel Buck-It Designer Software (Run setup.exe) |
| RMS Calculator for Various Waveforms (Run setup.exe) |
| Design Solutions | Device(s) Covered |
| Practical Switching Regulator Circuits |
MIC4574/5/6 |
| MIC2182 CIRCUIT DESIGN GUIDE |
MIC2182 |
| Application Notes | Title | Device(s) Covered |
| Application Note 13 |
52kHz LM2574/5/6 Simple Buck Family Design Guide | LM2574/5/6 |
| Application Note 14 |
200kHz MIC4574/5/6 Family Design Guide | MIC4574/5/6 |
| Application Note 15 |
Practical 200kHz Stepdown Switching Regulator Circuits | MIC4574/5/6 |
| Application Note 15 SMPS_2_0.EXE |
Software for Application Note 15 (Self-Extracting Zip File) |
MIC4574/5/6
|
 Application Note 15SMPS_2_0.XLS |
Software for Application Note 15 (Excel File) | MIC4574/5/6 |
| Application Note 15 smps_2_0.zip |
Software for Application Note 15 (ZipFile) |
MIC4574/5/6
|
| Application Note 18 |
MIC38C43 Off-Line Reference Design | MIC38C43 |
| Application Note 20 |
Photoflash High-Voltage Power Supply | MIC3172 MIC2171 MIC2570 |
| Application Note 21 |
Liquid Crystal Display Power Supplies | MIC2179 MIC3172 MIC4576 MIC2570/71 MIC2171 MIC2574 |
| Application Note 27 |
Troubleshooting Switching Power Supplies | - |
| Application Note 29 |
IEEE 1394 Device Power Supply | MIC4680 |
| Application Note 30 |
MIC2179 Lithium-Ion Battery Charger | MIC2179 |
| Application Note 36 |
Electroluminescent Display Drivers | MIC4826 MIC4827 |
| Application Note 40 |
LEDs vs. CCFL | MIC2142 MIC2145 |
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