austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams sales ams.com Please visit our website at www.ams.com Datasheet AS1358 / AS1359 150mA/300mA, Ultra-Low-Noise, High-PSRR Low Dropout Regulators 1 General Description 2 Key Features Preset Output Voltages: 1.5V to 4.5V (in 50mV steps) The AS1358 / AS1359 are ultra-low-noise, low-dropout linear regulators specifically designed to deliver up to 150/300mA Output Noise: 9VRMS 100Hz to 100kHz continuous output current, and can achieve a low 140mV dropout for 300mA load current. The LDOs are designed and optimized to work Power-Supply Rejection Ratio: 92dB 1kHz with low-cost, small-capacitance ceramic capacitors. Low Dropout: 140mV 300mA Load The devices are available as the standard products listed in Table 1. Table 1. Standard Products Stable with 1F Ceramic Capacitor for any Load Model Load Current Output Voltage Guaranteed 150mA / 300mA Output AS1358 150mA Preset 1.5V to 4.5V 1.25V Internal Reference AS1359 300mA Preset 1.5V to 4.5V Extremely-Low Quiescent Current: 40A An integrated P-channel MOSFET pass transistor allows the devices Excellent Load/Line Transient to maintain extremely low quiescent current (40A). Overcurrent and Thermal Protection The AS1358 / AS1359 uses an advanced architecture to achieve ultra-low output voltage noise of 9VRMS and a power-supply TSOT23 5-pin Package rejection-ratio of better than 80dB (up to 10kHz). The AS1358 / AS1359 requires only 1F output capacitor for stability 3 Applications at any load. When the LDO is disabled, current consumption drops below 500nA. The devices are ideal for mobile phones, wireless phones, PDAs, handheld computers, mobile phone base stations, Bluetooth portable The devices are available in a TSOT23 5-pin package. radios and accessories, wireless LANs, digital cameras, personal audio devices, and any other portable, battery-powered application. Figure 1. Typical Application Circuit Input Output 2V to 5.5V 1 5 1.5V to 4.5V IN OUT CIN 1F 2 AS1358 / AS1359 GND CBYPASS 10nF 4 3 On Off BYPASS COUT SHDNN 1F www.austriamicrosystems.com Revision 1.5 1 - 16 ams AG Technical content still valid