AS1357-T-F

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

The AS1357-T-F is a triple low-dropout (LDO) voltage regulator in a 12-pin QFN 4x4 package. It provides three independent output channels with a maximum current of 200mA each. The device supports an input supply range of 3V to 5.5V and offers programmable output voltages between 1.8V and 3.3V in 0.1V steps via one-time programmable (OTP) memory. Key electrical specifications include a dropout voltage of 0.2V at full load, a typical quiescent current of 175µA, and a shutdown current of ≤1µA. Output noise is specified at 40µVrms within the 10Hz to 100kHz bandwidth.

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

• Features three independent LDO regulators with digital enable inputs for individual channel control.
• Supports on-site programming of output voltages using OTP technology or factory-trimmed fixed versions.
• Ensures stability with low equivalent series resistance ceramic capacitors ranging from 1µF to 4.7µF.
• Integrates thermal protection and over-current protection mechanisms for enhanced reliability.

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

• Mobile phones
• Personal Digital Assistants (PDAs)
• MP3 players
• Handheld computers

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

Verify that the ordering suffix 'T' corresponds to tape and reel packaging rather than tray delivery. Confirm the specific pin configuration matches the 12-pin QFN 4x4 footprint required by the design. Ensure the selected version aligns with either user-programmable OTP capabilities or pre-defined voltage requirements.

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

Select this component when multiple regulated rails are needed from a single power source in space-constrained mobile designs. The OTP feature allows for design flexibility during prototyping without requiring custom factory orders. Verify that the required output voltages fall within the 1.8V to 3.3V range and that the load currents do not exceed 200mA per channel.

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

This part belongs to the AS1357 family of triple LDO regulators manufactured by austriamicrosystems AG. The family includes variants such as the AS1357V for different package options and fixed-voltage versions like the AS1357_A7A. These devices are designed to optimize the trade-off between quiescent current and performance for battery-powered applications.

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

No direct substitute part numbers are documented in the provided datasheet. Designers should evaluate other triple LDO regulators from the same manufacturer or competitors based on package compatibility and electrical parameter matching.

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

How are the output voltages configured?

The output voltages can be programmed on-site using the OTP function in 0.1V steps between 1.8V and 3.3V, or purchased as factory-trimmed fixed voltage versions.

What is the minimum capacitor requirement for stability?

The device is stable with ceramic output capacitors having a capacitance between 1µF and 4.7µF with ±20% tolerance (X5R).