AS1357V

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

The AS1357V is a triple low-dropout (LDO) voltage regulator in a 16-pin QFN 3x3 package. It provides three independent regulators with an output current of 200mA each and a supply range of 3 to 5.5V. The device features one-time programmable (OTP) output voltages ranging from 1.8V to 3.3V in 0.1V steps, with an accuracy of ±1.5%. Key electrical parameters include a dropout voltage of 0.2V at 200mA, shutdown current ≤1µA, and typical supply current of 175µA. It offers PSRR of 70dB at 1kHz and operates within a temperature range of -40°C to +85°C.

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

• Triple LDO architecture with independent digital enable inputs for each channel
• One-time programmable output voltage configuration allowing flexible design adaptation
• Low noise performance suitable for direct connection to sensitive circuits without additional filtering
• Integrated thermal protection and over-current protection mechanisms

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

• Mobile phones and PDAs
• MP3 players and handheld computers
• Digital cameras and portable media devices

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

Verify the specific ordering suffix to confirm the package type and delivery form. The AS1357V designation indicates the 16-pin QFN 3x3 package variant. Confirm whether the unit requires factory trimming or supports user-side OTP programming based on the final part number suffix. Ensure compatibility with the required output voltage settings before procurement.

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 designs. The 16-pin QFN 3x3 package offers a compact footprint compared to the 12-pin alternative. Consider the OTP capability if production volumes require customized voltage levels that differ from standard fixed versions. Verify ceramic capacitor stability requirements for the chosen load conditions.

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

The AS1357 series belongs to a family of high-performance triple CMOS low-dropout regulators designed for battery-powered mobile applications. The AS1357V specifically denotes the version housed in a 16-pin QFN 3x3 package, distinct from the 12-pin QFN 4x4 variant. This series emphasizes low quiescent current and excellent regulation performance under low dropout conditions.

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

The AS1357 (12-pin QFN 4x4) serves as a pin-compatible alternative regarding function but differs in package dimensions. No other direct substitute part numbers are documented in the provided datasheet.

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

What is the maximum output current per regulator?

Each of the three LDO channels can deliver up to 200mA.

How is the output voltage programmed?

The output voltage is set via a one-time programmable (OTP) function, allowing programming between 1.8V and 3.3V in 0.1V steps.

What is the minimum stable output capacitance?

The device is guaranteed stable with ceramic output capacitors ranging from 1µF to 4.7µF (±20% X5R).