Microchip MIC4575 Bedienungsanleitung


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2020 Microchip Technology Inc. DS20006464A-page 1
MIC4575
Features
Fixed 200 kHz Operation
3.3V, 5V, and Adjustable Output Versions
Voltage over Specified Line and Load Conditions:
- Fixed Version: ±3% Max. Output Voltage
- Adjustable Version: ±2% Max. Feedback
Voltage
Guaranteed 1A Switch Current
Wide 4V to 24V Input Voltage Range
Wide 1.23V to 20V Output Voltage Range
Requires Minimum External Components
<200 µA Typical Shutdown Mode
75% Efficiency (Adjustable Version >75% typ.)
Standard Inductors and Capacitors are 25% of
Typical LM2575 Values
Thermal Shutdown
Overcurrent Protection
100% Electrical Thermal Limit Burn-In
Applications
Simple High-Efficiency Step-Down (Buck)
Regulator
Efficient Pre-Regulator for Linear Regulators
On-Card Switching Regulators
Positive-to-Negative Converter (Inverting
Buck-Boost)
Battery Charger
Negative Boost Converter
Step-Down 6V to 3.3V for Intel Pentium and
Similar Microprocessors
General Description
The MIC4575 is a series of easy to use fixed and
adjustable BiCMOS step-down (buck) switch-mode
voltage regulators. The 200 kHz MIC4575 duplicates
the pinout and function of the 52 kHz LM2575. The
higher switching frequency may allow up to a 2:1
reduction in output filter inductor size.
The MIC4575 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 1A load with
excellent line and load regulation.
The feedback voltage is guaranteed to ±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
200 μA standby current. The regulator performs
cycle-by-cycle current limiting and thermal shutdown
for protection under fault conditions.
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 MIC4575 is available in TO-220 (T) and DDPAK
(U) packages for the industrial temperature range.
Package Types
MIC4575
5-Lead TO-220 (T)
(Top View)
BAT
5 SHDN
4FB
3 GND
2SW
1 VIN
BAT
5 SHDN
4FB
3 GND
2SW
1 VIN
MIC4575
5-Lead DDPAK (U)
(Top View)
1A, 200 kHz Buck Regulator


Produktspezifikationen

Marke: Microchip
Kategorie: Nicht kategorisiert
Modell: MIC4575

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