AS1367-BTDT-33

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The AS1367-BTDT-33 is a fixed-output, adaptive low-dropout linear regulator manufactured by ams OSRAM. It provides a nominal output voltage of 3.3V with a maximum continuous output current of 150mA. The device operates within an input voltage range of 2.0V to 5.5V and features a typical quiescent current of 10µA. Key electrical specifications include a dropout voltage of 110mV at full load, a power-supply rejection ratio (PSRR) of 60dB at 10kHz, and an output noise voltage of 15µV RMS over a 100Hz to 100kHz bandwidth. It incorporates integrated thermal shutdown, overcurrent protection, and under-voltage lockout.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Adaptive operation automatically switches between light-load and heavy-load modes to optimize efficiency and minimize power consumption based on the output current level.
• Integrated Power-OK open-drain output indicates when the regulated voltage is within regulation limits, providing a power-on-reset function.
• Built-in Bypass pin allows for external noise reduction via a capacitor connection to improve signal integrity in sensitive circuits.
• Internal auto-discharge resistance rapidly pulls the output voltage to ground upon shutdown to ensure safe system state transitions.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Cellular phones
• Wireless communication equipment
• Portable audio-video equipment

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific ordering code AS1367-BTDT-33 against the manufacturer's official documentation to confirm the 3.3V fixed output variant. Ensure compatibility with the required 8-pin TDFN 2x2 package dimensions and surface-mount assembly processes. Confirm that the application environment remains within the specified -40°C to +85°C operating temperature range to maintain guaranteed performance parameters.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component for applications requiring a precise 3.3V rail with minimal static power draw. The adaptive architecture makes it suitable for battery-powered devices where extending operational life is critical. Verify that the load current does not exceed 150mA and that the input voltage stays within the 2.0V to 5.5V window to prevent dropout or damage.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the AS1367 series of adaptive LDO regulators from ams OSRAM. The series offers various fixed output voltages ranging from 1.2V to 4.5V, as well as adjustable versions. All variants share the same 8-pin TDFN 2x2 package and core protection features, differing primarily in their factory-set output voltage levels defined by the two-digit suffix in the part number.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Direct substitutes include other AS1367 variants with different fixed output voltages, such as AS1367-BTDT-30 (3.0V) or AS1367-BTDT-45 (4.5V), provided the circuit design accommodates the voltage change. Cross-brand replacements require matching the 150mA current rating, 3.3V output, and 8-TDFN package footprint.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

How does the adaptive operation mode affect quiescent current?

The device automatically switches between light-load and heavy-load modes. In light-load conditions, it reduces quiescent current to approximately 10µA, while increasing slightly under heavier loads to maintain stability and efficiency.

What is the function of the SET pin in the fixed-output version?

For the fixed-output AS1367-BTDT-33, the SET pin is internally connected to the output via a resistive divider. It serves as the feedback reference point for the internal error amplifier and the Power-OK monitoring circuitry.