AS1355 Low Drop Out IC

Description

The AS1355 is a high-performance triple CMOS lowdropout 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.

Stability is guaranteed with ceramic output capacitors of only 1μF (±20% – X5R) up to 4.7μF (±20% – X5R). The low equivalent series resistance (ESR) of these capacitors ensures low output impedance at high frequencies. Regulation performance is excellent even under low dropout conditions, when the power transistor has to operate in linear mode.

The low-noise performance allows direct connection of noise sensitive circuits without additional filtering networks. The AS1355 is available in a 16-pin QFN 3x3 package.

Key Features

• 3 Independent Voltage Regulators with Shutdown
• Output Current: 300mA each LDO
• Programmable Output Voltage Range: 1.25V to 3.6V in 50mV Steps
• Accuracy: ±1.0%
• PSRR: 70dB at 1kHz, 60dB at 100kHz
• Line Regulation: ±2mV
• Load Regulation: ±0.6mV
• Supply Range: 2.3V to 5.5V
• 0.1V Dropout Voltage @ Iload = 200mA
• Shutdown Current: ≤1μA
• Supply Current Without Load: 160μA (typ)
• Softstart for Low Inrush Current
• Stable with low ESR Ceramic Capacitors from 1μF to 4.7μF
• Low Noise: 40μV rms @10Hz to 100kHz Bandwidth
• Thermal Protection
• Over-Current Protection

Applications

The AS1355 is ideal for cordless and mobile phones, MP3 players, CD and DVD players, PDAs, hand-held computers, digital cameras, and any other hand-held battery-powered device.

Block Diagram