S-1335A1J-A4T2U3

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The S-1335A1J-A4T2U3 is a device belonging to the family of PMIC (Power Management ICs), more specifically to the Voltage Regulators linear category. Its electrical characteristics, described further in the article, embody a wide range of applications.

Introduction

Supplied in a standard SOIC-8 package, the S-1335A1J-A4T2U3 is an adjustable low dropout (LDO) linear voltage regulator capable of providing a wide range of output voltages, proportionate to the applied input voltage. It is designed to provide a regulated voltage with low on-resistance, 150mA output current capability, and low dropout voltage.

Features and Benefits

• 3.3V Operating voltage range
• 150mA output current
• Low 420mV dropout voltage
• Adjustable output voltage range from 0.8V to 5.0V
• Low level on resistance of 0.55Ω
• Tight line and load regulation
• Thermal shutdown protection
• Eliminates the need for external sense resistors

Applications

The S-1335A1J-A4T2U3 is specifically designed for the adjustment of low voltage circuits, and can be used in DC/DC converters, power supply units, cellular radio systems, computing and communication systems, battery operated products and general purpose applications.

Working Principle

The S-1335A1J-A4T2U3 consists of two main blocks, a reference voltage generator and an error amplifier both connected in series inside an 8-pin package. It has separate pins for both the input voltage (VIN) and the output voltage (VOUT). The output voltage is set externally by applying a control voltage to the adjust (ADJ) pin. This control voltage is compared with the voltage reference, and a current is generated to the output based on the difference between them. This current is regulated by a PNP pass transistor.

When the S-1335A1J-A4T2U3 is enabled, the pass transistor is opened and the current is drawn from VOUT through an external bypass capacitor. The current delivered to VOUT is then compared to the reference voltage, any variation creates a voltage difference, which in turn creates an error signal. The error signal is then amplified and compared against the control voltage, if there is an inconsistency the output current is adjusted accordingly.

The S-1335A1J-A4T2U3 also features a thermal shutdown protection which prevents the device from overheating. Thermal shut down occurs when the die temperature rises above a predetermined temperature.

Conclusion

The S-1335A1J-A4T2U3 is an adjustable low-noise linear voltage regulator that can provide a regulated output current up to 150mA, a low dropout voltage of 420mV and a wide adjustable output voltage range. Its features and benefits make it suitable for a large number of applications, especially those with demanding low voltage requirements.

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