Datasheet Microchip MIC4574
The MIC4574 is a series of easy to use fixed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators
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MIC4574 Data Sheet
MIC4574 Micrel, Inc. MIC4574
200kHz Simple 0.5A Buck Regulator General Description Features The MIC4574 is a series of easy to use fixed and adjustable
BiCMOS step-down (buck) switch-mode voltage regulators.
The 200kHz MIC4574 duplicates the pinout and function of
the 52kHz LM2574. The higher switching frequency may
allow up to a 2:1 reduction in output filter inductor size.
The MIC4574 is available in 3.3V, and 5V fixed output
versions or a 1.23V to 20V adjustable output version. Both
versions are capable of driving a 0.5A load with excellent line
and load regulation.
The feedback voltage is guaranteed to В±2% tolerance for
adjustable versions, and the output voltage is guaranteed to
В±3% for fixed versions, within specified voltages and load
conditions. The oscillator frequency is guaranteed to В±10%.
In shutdown mode, the regulator draws less than 200ВµA
standby current. The regulator performs cycle-by-cycle current limiting and thermal shutdown for protection under fault
This series of simple switch-mode regulators requires a
minimum number of external components and can operate
using a standard series of inductors. Frequency compensation is provided internally. Fixed 200kHz operation 3.3V, 5V, and adjustable output versions Voltage over specified line and load conditions:
Fixed version: В±3% max. output voltage
Adjustable version: В±2% max. feedback voltage Guaranteed 0.5A switch current Wide 4V to 24V input voltage range Wide 1.23V to 20V output voltage range Requires minimum external components < 200ВµA typical shutdown mode 75% efficiency (adjustable version > 75% typ.) Standard inductors and capacitors are
25% of typical LM2574 values Thermal shutdown Overcurrent protection 100% electrical thermal limit burn-in Applications Simple high-efficiency step-down (buck) regulator ...
|Lifecycle Status||Production (Appropriate for new designs but newer alternatives may exist)||Production (Appropriate for new designs but newer alternatives may exist)||Production (Appropriate for new designs but newer alternatives may exist)|
|# of Outputs||1||1||1|
|Duty Cycle Max, %||0.95||0.95||0.95|
|Input Voltage Range, V||4 - 24||4 - 24||4 - 24|
|Light Load Efficiency Mode||No||No||No|
|Operating Temperature Range, °C||-40 to +85||-40 to +85||-40 to +85|
|Output Current, mA) Max||500||500||500|
|Output Voltage Range, V||1.23||1.23||1.23|
|Quiescent Current, mA) type||5||5||5|
|Regulator Type||Step Down (Buck)||Step Down (Buck)||Step Down (Buck)|
|SHUTDOWN Current, µA||50||50||50|
|Switching Frequency, kHz||200||200||200|
- Power Management > Switching Regulators > Step Down up to 36V