General Description

The AS1357 is a high-performance triple CMOS low-dropout voltage regulator in a single QFN package. The efficient set of programmable power supplies is optimized to deliver the best compromise between quiescent current and regulator performance for mobile phones, PDAs, MP3 players, and other battery powered devices.

Key Features

■ 3 Independent Voltage Regulators with Shutdown

■ Output Current: 200mA each LDO

■ One Time Programmable Output Voltage (User- or Factory-Trimmed)

■ Programmable Output Voltage Range: 1.8 to 3.3V in 0.1V Steps

■ Accuracy: ±1.5

■ PSRR: 70dB at 1kHz, 40dB at 100kHz

■ Line Regulation: ±2mV

■ Load Regulation: ±0.6mV

■ Supply Range: 3 to 5.5V

■ 0.2V Dropout Voltage @ I = 200mA

■ Shutdown Current: ≤1µA

■ Supply Current Without Load: 175µA (typ)

■ Softstart for Low Inrush Current

■ Stable with low ESR Ceramic Capacitors from 1 to 4.7µF

■ Low Noise: 40µV rms @10Hz to 100kHz Bandwidth

■ Thermal Protection

■ Over-Current Protection

■ Temperature Range: -40 to +85°C

■ Package Types: 12-pin QFN 4x4 and 16-pin QFN 3x3

Applications

The AS1357 is ideal for cordless and mobile phones, MP3 players, CD and DVD players, PDAs, handheld computers, digital cameras, and any other hand-held battery-powered device.