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MIC4574

200kHz 0.5A Step-down Regulator

Status: In Production

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 input voltage range: 4V to 24V
  • Wide output voltage range: 1.23V to 20V
  • 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
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Overview
Documents
Development Environment
RoHS Information
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Device Overview

Summary

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 DIP (N) packages for the industrial temperature range.

Additional 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 input voltage range: 4V to 24V
    • Wide output voltage range: 1.23V to 20V
    • 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
Parametrics
Name
Value
Regulator Type
Step Down (Buck)
# of Outputs
1
Input Voltage Range Min (V)
4
Input Voltage Range Max (V)
24
Output Voltage Range Min (V)
1.23
Output Current (mA) max
500
Quiescent Current (mA) typ
5
Switching Frequency (kHz)
200
Operating Temp Range
-40 to 85
Vfb (V)
1.23
Duty Cycle Max (%)
0.95
SHUTDOWN Current (µA) (Typ)
50

Documents

Jump to:

Data Sheet

11/05/2015
456KB

User Guides

11/11/2015
42KB

Development tools data is currently unavailable.

RoHS Information

Part Number
Device Weight (g)
Shipping Weight (Kg)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
MIC4574-3.3YN
0.486700
0.900000
8
PDIP
.300in
Matte Tin
e3
MIC4574-5.0YN
0.486700
0.900000
8
PDIP
.300in
Matte Tin
e3
MIC4574YN
0.486700
0.900000
8
PDIP
.300in
Matte Tin
e3
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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