Micrel's MIC2183 is a high efficiency PWM synchronous buck control IC. With its wide input voltage range of 2.9V to 14V, the MIC2183 can be used to efficiently step voltages down in 1- or 2-cell Li-Ion battery powered applications, as well as in fixed 3.3V, 5V, or 12V systems.

Efficiencies over 90% are achievable over a wide range of load conditions with the MIC2183's PWM control scheme. The operating frequency can be divided by two by raising the FREQ/2 pin to VDD. This allows the user to optimize efficiency versus board space. It also allows the MIC2183 to be externally synchronized to frequencies below its nominal 400KHz.

The MIC2183 features an oscillator output, FreqOut, which can be used to implement a simple charge pump in low voltage applications. The output of the charge pump can be fed into the gate drive power circuitry via the VINP pin. This feature allows enhanced gate drive, hence higher efficiencies at low input voltages.

MIC2183 also features a 1µA shutdown mode, and a programmable undervoltage lockout, making it well-suited for portable applications.

The MIC2183 is available in a 16-pin SOP (small-outline package) with a junction temperature range from -40°C to +125°C.

  Input voltage range: 2.9V to 14V

  >90% efficiency

  Oscillator frequency of 400kHz

  Frequency divide-by-two pin

  Frequency sync to 600kHz

  FreqOut oscillator output allows simple charge pump implementation in low voltage systems

  Front edge blanking

  5ω output drivers (typical)

  Soft start

  PWM current mode control

  1µA shutdown current

  Cycle-by-cycle current limiting

  Frequency foldback short circuit protection

  Adjustable under-voltage lockout

  16-pin narrow-body SOP and QSOP package options