AS1353-15-T

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

The AS1353-15-T is a fixed-voltage linear low-dropout regulator (LDO) manufactured by ams OSRAM USA INC. It provides a nominal output voltage of 1.5V with a maximum output current capability of 150mA. The device operates within an input voltage range of 2.5V to 5.5V and maintains high accuracy, specified at ±1% at 25°C and ±3% across the full temperature range. Key electrical parameters include a typical dropout voltage of 40mV at 100mA load, a power-supply rejection ratio (PSRR) of 60dB at 100Hz, and a quiescent current of 180µA at 100µA load. The shutdown supply current is less than 1µA.

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

• Integrated P-channel MOSFET pass transistor enables ultra-low dropout voltage and minimal quiescent current consumption under varying load conditions.
• Built-in reverse-battery protection disconnects internal circuitry and parasitic diodes if the battery polarity is connected incorrectly.
• Active-low shutdown control logic reduces supply current to less than 1µA when the SHDNM pin is driven low.
• Comprehensive protection mechanisms include integrated over-current limiting and thermal overload shutdown to prevent device damage.

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

• Powering cordless and mobile phones
• Supplying MP3 players and handheld computers
• Providing regulated voltage for digital cameras
• Supporting PDAs and other battery-powered devices

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

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific ordering suffix matches the required tape and reel packaging format. Ensure the part number corresponds to the 1.5V fixed output variant. Check for any obsolescence notices or lifecycle status updates from ams OSRAM prior to finalizing procurement plans.

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

Select this component for applications requiring a stable 1.5V rail with moderate current demands up to 150mA. The SOT23-5 package is suitable for space-constrained designs. Ensure the input voltage remains within the 2.5V to 5.5V operational window. Verify that the load capacitor meets the minimum capacitance and ESR requirements for stability across the operating temperature range.

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

This device belongs to the AS1353/AS1356 family of linear LDO regulators designed for portable electronics. The AS1353 series specifically lacks the Power-OK feature found in the AS1356 variants but retains reverse-battery protection. The product line utilizes a P-channel MOSFET architecture to optimize efficiency and noise performance compared to traditional NPN-based regulators.

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

Consult official cross-reference tools for compatible alternatives. Verify that substitute components match the 1.5V output, 150mA current rating, and SOT23-5 footprint. Ensure equivalent PSRR and dropout characteristics are maintained for the target application.

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

What is the function of the BP pin on the AS1353?

The BP pin serves as a reference-noise bypass terminal. Connecting a 0.01µF ceramic capacitor to ground reduces output noise.

How does the device handle reverse battery connection?

The AS1353 includes integrated reverse-battery protection that disconnects the internal circuitry and parasitic diodes if the battery is connected with incorrect polarity.