S-1312B25-M5T1U3

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

The S-1312B25-M5T1U3 is a positive voltage regulator IC from the S-1312 Series, manufactured by ABLIC Inc. using CMOS technology. It provides a fixed output voltage of 2.5 V with an accuracy of ±1.0%. The device supports an input voltage range of 1.5 V to 5.5 V and delivers up to 150 mA of output current. Key electrical characteristics include a typical dropout voltage of 160 mV at 100 mA, a ripple rejection ratio of 70 dB typ., and low current consumption of 20 μA during operation. It operates within an ambient temperature range of −40°C to +85°C.

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

• Built-in discharge shunt function for rapid output capacitor discharge when the ON/OFF pin is set to OFF level.
• Integrated overcurrent protection circuit limits excessive output current and protects against short circuits.
• Thermal shutdown circuit prevents damage by stopping regulation when junction temperature reaches approximately 150°C.
• ON/OFF control logic allows significant reduction in current consumption when the device is disabled.

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

• Constant-voltage power supply for portable communication devices
• Constant-voltage power supply for digital cameras and digital audio players
• Constant-voltage power supply for battery-powered devices

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

Verify the specific product type B configuration, which includes the discharge shunt function but lacks the pull-down resistor on the ON/OFF pin. Confirm that the M5T1 suffix corresponds to the SOT-23-5 package with tape packing specifications. Ensure compatibility with required ceramic input and output capacitors of 0.22 μF or more for stable operation.

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

Select this component for applications requiring a fixed 2.5 V output with high accuracy and low quiescent current. The B-type variant is suitable when discharge shunt functionality is needed but internal pull-down on the control pin is not desired. Consider package power dissipation limits when designing for high load currents or elevated ambient temperatures.

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

This part belongs to the S-1312 Series of low dropout voltage regulators. The series offers selectable output voltages from 1.0 V to 3.5 V in 0.05 V steps. The B-type designation specifically indicates active HIGH ON/OFF logic with available discharge shunt function and unavailable pull-down resistor. Other variants (A, C, D) differ in these internal control features.

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

S-1312A25-M5T1U3: Available as a similar replacement with identical electrical performance but includes an internal pull-down resistor on the ON/OFF pin.

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

What is the behavior of the ON/OFF pin if left floating?

For the S-1312 Series B type, the ON/OFF pin has no internal pull-up or pull-down resistor. It must not be used in a floating status; it should be connected to the VIN pin if not utilized.

How does the discharge shunt function operate?

When the ON/OFF pin is set to the OFF level, the built-in discharge shunt circuit turns on, rapidly discharging the output capacitance so that the VOUT pin reaches the VSS level.