AS1331 Buck-Boost Converter IC
300mA, DC-DC Buck-Boost Converter
Description
The AS1331 is a synchronous buck-boost DC/DC converter which can handle input voltages above, below, or equal to the output voltage.
Due to the internal structure of the AS1331 which is working continuously through all operation modes, this device is ideal for single cell Li-Ion and multicell alkaline/NiCad/NiMH applications.
The AS1331 operates on lowest quiescent current of 22µA only resulting in highest efficiency up to 90% over a wide range of load currents. Combined with a shutdown current of typically 100nA, the AS1331 extends the lifetime of battery powered applications to a maximum.
The AS1331 allows a small solution footprint and external component count is also minimized. For power monitoring, the AS1331 offers either low battery detection or a power-ok feature offering flexibility for the design of applications. Additionally the AS1331 offers current limiting, thermal shutdown and output disconnect.
The AS1331 is available in a 10-pin 3x3mm TDFN package with fixed and adjustable output voltage.
Key Features
- Input Voltage Range: 1.8V to 5.5V
- Output Voltages: - Fixed: 2.5V, 3.0V, 3.3V - Adjustable: 2.5V to 3.3V
- Output Current: 300mA @ 3.3V
- Up to 90% efficiency
- Power Good
- Output Disconnection in Shutdown
- Automatic transition between Buck and Boost mode
- Ultra Low Quiescent Current: 22μA, Shutdown Current 100nA (Active Low)
- Short-Circuit Protection
- Low Battery detection
- Over Temperature Protection
- 10-pin 3x3mm TDFN package
Applications
The AS1331 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.
