AS1361 Low-Dropout IC

Description

The AS1361/AS1362 are ultra-low-noise, low-dropout linear regulators specifically designed to deliver up to 150/300mA continuous output current, and can achieve a low 140mV dropout for 300mA load current. The LDOs are designed and optimized to work with low-cost, small-capacitance ceramic capacitors.

An integrated P-channel MOSFET pass transistor allows the devices to maintain extremely low quiescent current (40μA).

The AS1361/AS1362 uses an advanced architecture to achieve ultra-low output voltage noise of 9μVRMS and a power-supply rejection-ratio of better than 80dB (up to 10kHz) and 92dB @ 1kHz.

An active-Low, open-drain power-ok output indicates if the output voltage is within regulation.

The AS1361/AS1362 requires only 1μF output capacitor for stability at any load. When the LDO is disabled, current consumption drops below 500nA.

The devices are available in a TSOT23 6-pin package.

Key Features

• Preset Output Voltages: 1.5V to 4.5V (in 50mV steps)
• Output Noise: 9μVRMS @ 100Hz to 100kHz
• Power-Supply Rejection Ratio: 92dB @ 1kHz
• Low Dropout: 140mV @ 300mA Load
• Power-OK Output
• Stable with 1μF Ceramic Capacitor for any Load
• Guaranteed 150/300mA Output
• 1.25V Internal Reference
• Extremely-Low Quiescent Current: 40μA
• Excellent Load/Line Transient
• Overcurrent and Thermal Protection
• TSOT23 6-pin Package

Applications

The devices are ideal for mobile phones, wireless phones, PDAs, handheld computers, mobile phone base stations, Bluetooth portable radios and accessories, wireless LANs, digital cameras, personal audio devices, and any other portable, noise-sensitive battery-powered application.

Block diagram for AS1361 Low-Dropout IC