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MIC26903

28V/9A DC-DC Buck Regulator w/Hyper Light Load™

Status: In Production

Features:

  • Hyper Speed Control™ architecture enable
  • High delta V operation (VIN = 28V and VOUT = 0.8V)
  • Small output capacitance
  • Input voltage range: 4.5V to 28V
  • Output current up to 9A
  • Up to 95% efficiency
  • Adjustable output voltage from 0.8V to 5.5V
  • ±1% FB accuracy
  • Any Capacitor™ stable - zero-to-high ESR
  • 600kHz switching frequency
  • Power Good (PG) output
  • Foldback current-limit and "hiccup" mode short-circuit protection
  • Safe start-up into pre-biased loads
  • -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 MIC26903 is a constant-frequency, synchronous DC/DC buck regulator featuring adaptive on-time control architecture. The MIC26903 operates over a supply range of 4.5V to 28V. It has an internal linear regulator which provides a regulated 5V to power the internal control circuitry. MIC26903 operates at a constant 600kHz switching frequency in continuous conduction mode and can be used to provide up to 9A of output current. The output voltage is adjustable down to 0.8V. HyperLight Load® architecture provides the same high-efficiency and ultra-fast transient response as the Hyper Speed Control™ architecture under medium to heavy loads, but also maintains high efficiency under light load conditions by transitioning to variable frequency, discontinuous mode operation. The MIC26903 offers a full suite of protection features to ensure protection of the IC during fault conditions. These include undervoltage lockout to ensure proper operation under power-sag conditions, thermal shutdown, internal soft-start to reduce the inrush current, foldback current limit and "hiccup" mode short-circuit protection. The MIC26903 includes a Power Good (PG) output to allow simple sequencing.

Additional Features

     

    • HyperLight Load® efficiency - up to 80% at 10mA
      • Hyper Speed Control™ architecture enable
      • High delta V operation (VIN = 28V and VOUT = 0.8V)
    • Small output capacitance
    • Input voltage range: 4.5V to 28V
    • Output current up to 9A
    • Up to 95% efficiency
    • Adjustable output voltage from 0.8V to 5.5V
    • ±1% FB accuracy
    • Any Capacitor™ stable - zero-to-high ESR
    • 600kHz switching frequency
    • Power Good (PG) output
    • Foldback current-limit and "hiccup" mode short-circuit protection
    • Safe start-up into pre-biased loads
    • -40°C to +125°C junction temperature range
Parametrics
Name
Value
Regulator Type
Step Down (Buck)
# of Outputs
1
Input Voltage Range Min (V)
4.5
Input Voltage Range Max (V)
28
Output Voltage Range Min (V)
0.8
Output Voltage Range Max (V)
5.5
Output Current (mA) max
9000
Quiescent Current (mA) typ
0.45
Switching Frequency (kHz)
600
Synchronous Rectifier
Yes
Operating Temp Range
-40 to 125
Vfb (V)
0.8
Duty Cycle Max (%)
0.82
SHUTDOWN Current (µA) (Typ)
5
Light Load Efficiency Mode
Yes

Documents

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Development Environment

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Software Libraries
Analog Simulation - MIC26903

The Micrel MIC26903 is a constant-frequency, synchronous DC/DC buck regulator featuring adaptive on-time control architecture. The MIC26903 operates over a supply range of 4.5V to 28V. It has an...

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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
MIC26903YJL-TR
0.081600
0.227180
28
VQFN
5x6x0.9mm
NiPdAu
e4
MIC26903-ZAYJL-TR
0.081600
0.227180
28
VQFN
5x6x0.9mm
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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