AS1322A-BTTT

Overview

The AS1322A-BTTT is a synchronous, fixed-frequency DC-DC boost converter manufactured by ams OSRAM. It operates at a high-speed switching frequency of 1.2MHz and utilizes an internally compensated PWM current mode design. The device features an internal PMOS synchronous rectifier and automatic powersave operation to maximize efficiency. It delivers 150mA at 3.3V from a single AA cell or 500mA at 3.3V from two AA cells. The unit supports a low start-up voltage of 0.85V and offers a logic-controlled shutdown function with less than 1µA standby current.

Feature Summary

• Synchronous step-up conversion architecture for high efficiency
• Automatic powersave operation for optimized light-load performance
• Logic-controlled shutdown capability for ultra-low power states
• Anti-ringing control mechanism to minimize electromagnetic interference

Applications

• LCD bias supplies
• Digital cameras
• MP3 players
• Cordless phones
• GPS receivers

Procurement Notes

Verify the specific suffix BTTT against official datasheets to confirm reel packaging specifications. Confirm that the automatic powersave feature aligns with system requirements, as the AS1322B variant maintains continuous switching. Ensure input voltage ranges match the 0.85V start-up threshold before finalizing procurement orders.

Selection Notes

Select this component when ultra-small size and minimal external parts are critical constraints. The 1.2MHz frequency allows for smaller passive components compared to lower-frequency alternatives. Choose the AS1322A over the AS1322B if automatic powersave operation is preferred over continuous switching at light loads to enhance battery life in portable devices.

Part Context

This part belongs to the AS1322 series of low-voltage micropower DC-DC converters designed for portable electronics. The series addresses the need for efficient power management in space-constrained applications. It serves as a compact solution for generating stable output voltages from single-cell alkaline or lithium-ion sources.

Replacement Considerations

The AS1322B is a functional alternative within the same series but lacks automatic powersave operation. Verify pin compatibility and thermal characteristics when substituting. No other cross-references are confirmed in public documentation.