AS1325
Step-up DC-DC converter
Description
The AS1325 is a high-efficiency step-up DC-DC converter designed to generate a fixed output voltage of +3.3V or +5V.
The AS1325 achieves an efficiency of up to 96% and the minimum input voltage is 1.5V. The AS1325-BSTT-33 delivers up to 300mA output current at the fixed output voltage of +3.3V (@ 2V VBATT). With the fixed output voltage of +5V the AS1325-BSST-50 supplies up to 185mA output current (@ 2V VBATT).
In order to save power the AS1325 features a shutdown mode, where it draws less than 1μA. In shutdown mode the battery is connected directly to the output enabling the supply of real-time-clocks.
The AS1325 provides a power-on reset output that goes high-impedance when the output reaches 90% of its regulation point.
The SHDNN trip threshold of the AS1325 can be used as an input voltage detector that disables the device when the battery voltage falls to a predetermined level.
An internal synchronous rectifier is included.
The AS1325 is available in a 6-pin SOT23 package.
Key Features
- Fixed Output Voltage: 3.3V or 5.0V 3.3V (AS1325-BSTT-33) or 5V (AS1325-BSST-50)
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Output Current:
Up to 300mA (AS1325-BSTT-33) @ 2V VBATT
Up to 185mA (AS1325-BSST-50) @ 2V VBATT - Internal Synchronous Rectifier
- Shutdown Mode Supply Current: Less Than 1µA
- Efficiency: Up to 96%
- Minimum Input Voltage: +1.5V
- Accurate Shutdown Low-Battery Cutoff Threshold
- Battery Input Connected to Pin OUT in Shutdown Mode for Backup Power
- Antiringing Control Minimizes EMI
- Ripple Reduction at Light Loads
- 6-pin SOT23 Package
Applications
The AS1325 is ideal for low-power applications where ultra-small size is critical as in medical diagnostic equipment, hand-held instruments, pagers, digital cameras, remote wireless transmitters, cordless phones, and PC cards.
The device is also perfect as a local supply or as a battery backup.
