Datasheet Microchip MIC2183 — Datenblatt

MIC2183 Micrel, Inc. MIC2183
Low Voltage Synchronous Buck PWM Control IC General Description Features 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 1ВµA shutdown mode, and a programmable undervoltage lockout, making it well-suited for
portable applications.
The MIC2183 is available in 16-pin SOP and QSOP packaging options with a junction temperature range from -40В°C to
+125В°C. Input voltage range: 2.9V to 14V
>90% efficiency
Oscillator frequency of 400kHz …