LP3997-18QVF

The LP3997 family are high performance low dropout （LDO ） voltage regulators with ultra-low quiescent current, high PSRR, fast transient response, and high accuracy. The devices with advanced CMOS process are suitable for many applications that require regulated supplies of up to 300mA load current. The LP3997 family include standard fixed output voltages of 1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, and 3.3V. The devices are stable with a 1.0μF~10μF ceramic output capacitor. The devices are protected from short circuit by a current limit function and from over-heating by a thermal overload protection. The devices are available in standard DFN-4 (1mmx1mm) and SOT23-5 packages. The LP3997 family are high performance, low dropout linear regulators with fixed 1.2V to 5.0V output voltages and up to 300mA output current capability. The family with ultra-low quiescent current are suited for battery powered portable applications. Optimized for using with ceramic capacitors, the device provides excellent transient performance. Internally, the devices consist of a voltage reference, an enable control logic, an error amplifier, a feedback voltage divider, and a PMOS pass transistor. Output current is delivered via the PMOS pass device, which is controlled by the error amplifier. The error amplifier compares a reference voltage with the feedback voltage from the output and amplifies the difference. If the feedback voltage is lower than the reference voltage, the gate of the PMOS device is pulled lower, allowing more current to flow and increasing the output voltage. If the feedback voltage is higher than the reference voltage, the gate of the PMOS device is pulled higher, allowing less current to flow and decreasing the output voltage.

Applications

• Wearable devices
• Digital cameras
• Audio devices
• Portable and battery-powered equipment
• Post dc-to-dc regulation
• Post regulation
• Wireless handsets

Key features

• Wide Input Voltage Range: 1.6V to 6.0V
• Fixed Output Voltage: 1.2V to 5V
• Maximum Load Current Up to 300mA
• High PSRR: 65dB@1kHz
• Ultra-Low Quiescent Current: 2μA
• Low Noise: 60μV RMS typical
• Low Dropout Voltage: - 60mV @ 100mA Load, VOUT = 3.3V - 180mV @ 300mA Load, VOUT = 3.3V
• Output Voltage Accuracy: ±1.5% @ 1mA typical
• Thermal Shutdown Protection
• Excellent Load/Line Transient Response
• Line Regulation: 0.02%/V typical
• Load Regulation: 20mV typical
• Robust ESD capability: - Human Body Model: 4kV - Charged Device Model: 1kV
• Package: SOT23-5, DFN1x1-4
• RoHS Compliant and 100% Lead (Pb) -Free