Microchip Technology

The MIC2127A is a constant-frequency synchronous buck controllers featuring a unique adaptive ON-time control architecture. The MIC2127A operates over an input voltage range from 4.5V to 75V and can be used to supply load current up to 25A (Thermally Limited) . The output voltage is adjustable down to 0.6V with a guaranteed accuracy of ±1%. The device operates with programmable switching frequency from 200kHz to 800kHz. The MIC2127A offers a full suite of protection features to ensure protection of the IC during fault conditions. These include undervoltage lockout to ensure proper operation under power-sag conditions, Internal Soft Start, "hiccup" mode short-circuit protection, and thermal shutdown.

The MIC2129 is a constant-frequency synchronous buck controllers featuring a unique adaptive ON-time control architecture. The MIC2129 operates over an input voltage range from 4.5V to 100V and can be used to supply load current up to 25A (Thermally Limited) . The output voltage is adjustable down to 0.6V with an accuracy of ±1%. The device operates with programmable switching frequency from 100kHz to 800kHz. The MIC2129 controller offers three selectable gate drive voltages (5.2V, 7.5V, 10.5V) to enable the use of logic level or standard FETS to ensure optimal efficiency. The high voltage bootstrap diode is also integrated in this controller saving overall solution size and cost. The other key features of the MIC2129 are remote sense, integrated bootstrap LDO's, adjustable soft start, selectable light load operating modes, precision enable, selectable current limit modes (Hiccup, Latch-up, Cycle by cycle), output OVP protection, Power Good and thermal shut down. The MIC2129 is offered in a 24 pin QFN and as well as TSSOP packages.

The MIC2132 is an advanced constant on-time, dual phase synchronous buck controller featuring a unique adaptive ON-time control architecture with stackable feature up to 8 phases. The MIC2132 operates over an input supply range from 4.5V to 75V and can be used in application requiring up to 50A of output current. The output voltage is adjustable down to 0.6V with a guaranteed accuracy of ±1% over the entire operating or ±0.5% for -40 to 105 degrees C temperature range . The device operates with programmable switching frequency from 100 kHz to 1MHz per phase. The Hyper Speed Control® architecture supports ultrafast transient response under medium to heavy loads. The soft start is also programmable externally with a capacitor, thus enabling safe start-ups into heavy loads. The MIC2132 has a remote sense amplifier for accurate output voltage control. The MIC2132 offers a full suite of protection features to ensure protection of the IC during various fault conditions. These include under-voltage lockout (UVLO) to ensure proper operation under power-sag conditions, hiccup mode short-circuit protection and thermal shutdown. The MIC2132 is available in a 32-pin 5mm x 5mm VQFN package with a –40°C to +125°C junction operating temperature range

The MIC2141 is a micropower boost switching regulator that can operate from 3- or 4-cell nickel-metal-hydride batteries or a single Li-Ion cell. This regulator employs a constant 330kHz, fixed 18% duty-cycle, gated-oscillator architecture. The MIC2141 can be used in applications where the output voltage must be dynamically adjusted. The device features a control signal input which is used to proportionally adjust the output voltage. The control signal input has a gain of 6, allowing a 0.8V to 3.6V control signal to vary a 4.8V to 22V output. The MIC2141 requires only three external components to operate and is available in a tiny 5-lead SOT-23 package for space and power-sensitive portable applications. The MIC2141 draws only 70µA of quiescent current and can operate with an efficiency exceeding 85%.