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AS1331 Buck-Boost

300mA, DC-DC Buck-Boost Converter

The AS1331 is a synchronous buck boost converter with 300mA output capability at 3.3V, ideal for single and multi-cell operation. With 22uA quiescent current the device ensures over 90% efficiency. System protection includes undervoltage/power good signalling, and both current limiting and thermal shutdown.

Block diagram of the AS1331 Buck-Boost

Key Features

  • Automatic transition between buck and boost
  • 90% efficiency with 300mA @ 3.3V, 22uA quiescent current
  • Synchronous switching

Key Benefits

  • Wide input voltage variation tolerance#
  • Long battery life
  • Controlled noise spectrum

AS1331 Applications

The AS1331 Buck-Boost Converter is an ideal solution for handheld computers, handheld instruments, portable music players and PDA's. Two and three cell Alkaline, NiCd or NiMH or single cell Li battery powered products.

AS1331 Product Facts

Input voltage [V] 1.8 to 5.5
Output voltage [V] 2.5 to 3.3
Output current [mA] 300
Efficiency [%] 90
Iq [μA] 22
Architecture hysteretic, sync.
fmax [kHz] <500
Enable/SHDN [ ]
Reset [POK]
Features Low battery detection, fixed 2.5V, 3.0V or 3.3V output voltage, in adjustable variant adjustable in whole range
Package TDFN-10 (3x3)