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AS1325 Datasheet(PDF) 1 Page - ams AG |
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AS1325 Datasheet(HTML) 1 Page - ams AG |
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1 / 17 page  AS1325 300mA Step-Up DC-DC Converter www.austriamicrosystems.com Revision 1.01 1 - 17 Dat a Sh eet 1 General Description The AS1325 is a high-efficiency step-up DC-DC con- verter 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 reg- ulation 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. Figure 1. Application Diagram 2 Key Features ! Fixed Output Voltage: - 3.3V (AS1325-BSTT-33) or 5V (AS1325-BSST-50) ! 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 3 Applications The AS1325 is ideal for low-power applications where ultra-small size is critical as in medical diagnostic equip- ment, 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. +5.0V Output only AS1325 COUT 22µF CIN 22µF L1 10µH RESETN Output R1 100k Ω On Off 4 LX 3 GND 2 BATT 6 RESETN 1 SHDNN 5 OUT +1.5 to +3.3V or +1.5 to +5.0V Battery +3.3 or +5.0V Output |
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