LDO Regulator Pos 2.5V 0.3A 5-Pin SOT-23 T/R

The Si91843 is a 150-mA CMOS LDO (low dropout) voltage regulator. It is the perfect choice for low voltage, low power applications. An ultra low ground current makes this part attractive for battery operated power systems. The Si91843 also offers ultra low dropout voltage to prolong battery life in portable electronics. Systems requiring a quiet voltage source, such as RF applications, will benefit from the Si91843’s ultra low output noise. An external noise bypass capacitor connected to the device’s BP pin can further reduce the noise level. The Si91843 is designed to maintain regulation while delivering 300-mA peak current, making it ideal for systems that have a high surge current upon turn-on. For better transient response and regulation, an active pull-down circuit is built into the Si91843 to clamp the output voltage when it rises beyond normal regulation. The Si91843 automatically discharges the output voltage by connecting the output to ground through a 100- n-channel MOSFET when the device is put in shutdown mode.The Si91843 features reverse battery protection to limit reverse current flow to approximately 1- A in the event reversed battery is applied at the input, thus preventing damage to the IC.

• Ultra Low Dropout-130 mV at 150-mA Load
• Ultra Low Noise-30 µV_(rms) (10-Hz to 100-kHz Bandwidth)
• Shutdown Control
• 110- µA Ground Current at 150-mA Load
• 1.5% Guaranteed Output Voltage Accuracy
• 300-mA Peak Output Current Capability
• Uses Low ESR Ceramic Capacitors
• Fast Start-Up (50 µs)
• Fast Line and Load Transient Response ( =30 µs)
• 1-µ A Maximum Shutdown Current
• Output Current Limit
• Reverse Battery Protection
• Built-in Short Circuit and Thermal Protection
• Si91843: Output, No-Discharge In Shutdown Mode
• SOT23-5 Package