Microchip MIC4574 Handleiding
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2020 Microchip Technology Inc.DS20006472A-page 1
MIC4574
Features
•Fixed 200kHz 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 0.5A Switch Current
•Wide 4V to 24V Input Voltage Range
•Wide 1.23V to 20V Output Voltage Range
•Requires Minimum External Components
•<200µA 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
•Efficient Pre-Regulator for Linear Regulators
•On-Card Switching Regulators
•Positive-to-Negative Converter (Inverting
Buck-Boost)
•Isolated Flyback Converter using Minimum
External Components
•Negative Boost Converter
General Description
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 ±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
200μA 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 MIC4574 is available in the DIP (N) package and
is rated over the industrial temperature range.
Package Type
MIC4574
8-Lead PDIP (N)
(Top View)
1
2
3
4
8
7
6
5
FB
SGND
SHDN
PGND
NC
SW
NC
V
IN
0.5A, 200kHz Buck Regulator
Product specificaties
| Merk: | Microchip |
| Categorie: | Niet gecategoriseerd |
| Model: | MIC4574 |
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