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MIC2245

4MHz 500mA Synchronous Buck Regulator w/LowQ® Mode

Status: In Production

Features:

  • 2.7V to 5.5V supply/input voltage
  • Light load LowQ® LDO mode
  • 4MHz PWM mode
  • Adjustable output voltage option down to 1V
  • Ultra-fast transient response
  • Uses a tiny 1µH inductor
  • Fully integrated MOSFET switches
  • Micropower shutdown operation
  • Thermal shutdown and current limit protection
  • -40°C to +125°C junction temperature range
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Overview
Documents
Development Environment
RoHS Information
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Device Overview

Summary

The MIC2245 is a high efficiency 4MHz pulse width modulated (PWM) synchronous buck (stepdown) regulator that features a LowQ® LDO standby mode that draws only 18µA of quiescent current. The MIC2245 allows an ultra-low noise, small size, and high efficiency solution for portable power applications.

In PWM mode, the MIC2245 operates with a constant frequency 4MHz PWM control. Under light load conditions, such as in system sleep or standby modes, the PWM switching operation can be disabled to reduce switching losses. In this light load LowQ® mode, the LDO maintains the output voltage and draws only 18µA of quiescent current. The LDO mode of operation saves battery life while not introducing spurious noise and high ripple as experienced with pulse skipping or bursting mode regulators.

The MIC2245 operates from a 2.7V to 5.5V input voltage and features internal power MOSFETs that can supply up to 500mA output current in PWM mode. It can operate with a maximum duty cycle of 100% for use in low-dropout conditions.

Additional Features
    • 2.7V to 5.5V supply/input voltage
    • Light load LowQ® LDO mode
    • 4MHz PWM mode
    • Adjustable output voltage option down to 1V
    • Ultra-fast transient response
    • Uses a tiny 1µH inductor
    • Fully integrated MOSFET switches
    • Micropower shutdown operation
    • Thermal shutdown and current limit protection
    • -40°C to +125°C junction temperature range
Parametrics
Name
Value
Regulator Type
Step Down (Buck)
# of Outputs
1
Input Voltage Range Min (V)
2.7
Input Voltage Range Max (V)
5.5
Output Voltage Range Min (V)
1
Output Voltage Range Max (V)
5.5
Output Current (mA) max
500
Quiescent Current (mA) typ
0.71
Switching Frequency (kHz)
4000
Synchronous Rectifier
Yes
Operating Temp Range
-40 to 125
Vfb (V)
1
Duty Cycle Max (%)
1
SHUTDOWN Current (µA) (Typ)
0.01

Documents

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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
MIC2245YML-TR
0.022700
0.643702
10
VDFN
3x3x0.9mm
NiPdAu
e4
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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