MIC4576 Micrel, Inc. MIC4576
200kHz Simple 3A Buck Regulator General Description Features The MIC4576 is a series of easy to use п¬Ѓxed and adjustable
BiCMOS step-down (buck) switch-mode voltage regulators.
The 200kHz MIC4576 duplicates the pinout and function of
the 52kHz LM2576. The higher switching frequency may
allow up to a 2:1 reduction in output filter inductor size. 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: ±2% max. feedback voltage Guaranteed 3A switch current Wide 4V to 36V input voltage range Wide 1.23V to 33V output voltage range Requires minimum external components < 200µA typical shutdown mode 75% efficiency (adjustable version > 75% typical) Standard inductors are 25% of typical LM2576 values Thermal shutdown Overcurrent protection 100% electrical thermal limit burn-in The MIC4576 is available in 3.3V, and 5V fixed output versions or a 1.23V to 33V adjustable output version. Both
versions are capable of driving a 3A 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
±3% for fixed versions, within specified voltages and load conditions. The oscillator frequency is guaranteed to ±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 conditions. Applications 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.
The MIC4576 is available in TO-220 (T) and TO-263 (U)
packages for the industrial temperature range. Simple high-efficiency step-down (buck) regulator
Efficient preregulator for linear regulators
On-card switching regulators …
