AS1320

Description

The AS1320 is a high-efficiency step-up DC-DC converter designed to generate a fixed voltage of +3.3V.

The AS1320 achieves an efficiency of up to 90%. The minimum input voltage is 1.5V, the output voltage is fixed at 3.3V, and output current is up to 200mA (@ 2V).

In order to save power the AS1320 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 AS1320 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 AS1320 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, thus an external transistor or Schottky diode is not required.

The AS1320 is available in a 6-pin SOT23 package.

Key Features

• Fixed Output Voltage: 3.3V
• Output Current: Up to 200mA (@ 2V)
• Internal Synchronous Rectifier
• Requires No External Schottky Diode or FETs
• Shutdown Mode Supply Current: Less Than 1µA
• Efficiency: Up to 90%
• Minimum Input Voltage: +1.5V
• Accurate Shutdown Low-Battery Cutoff Threshold
• Battery Input Connected to Pin OUT in Shutdown
• Mode for Backup Power
• 6-pin SOT23 Package

Applications

The AS1320 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 3.3V supply or as a battery backup.

Block Diagram