Datasheet AS1361/AS1362 150mA/300mA, Ultra-Low-Noise, High-PSRR Low Dropout Regulators, with POK 1 General Description 2 Key Features Preset Output Voltages: 1.5 to 4.5V (in 50mV steps) The AS1361/AS1362 are ultra-low-noise, low-dropout linear regulators specifically designed to deliver up to Output Noise: 9VRMS 100Hz to 100kHz 150/300mA continuous output current, and can achieve a low 140mV dropout for 300mA load current. The LDOs Power-Supply Rejection Ratio: 92dB 1kHz are designed and optimized to work with low-cost, small- capacitance ceramic capacitors. Low Dropout: 140mV 300mA Load The devices are available as the standard products Power-OK Output listed in Table 1. Stable with 1F Ceramic Capacitor for any Load Table 1. Standard Products Guaranteed 150/300mA Output Model Load Current Output Voltage AS1361 150mA Preset 1.5 to 4.5V 1.25V Internal Reference AS1362 300mA Preset 1.5 to 4.5V Extremely-Low Quiescent Current: 40A An integrated P-channel MOSFET pass transistor allows Excellent Load/Line Transient the devices to maintain extremely low quiescent current Overcurrent and Thermal Protection (40A). The AS1361/AS1362 uses an advanced architecture to TSOT23 6-pin Package achieve ultra-low output voltage noise of 9VRMS and a power-supply rejection-ratio of better than 80dB (up to 3 Applications 10kHz). The devices are ideal for mobile phones, wireless An active-Low, open-drain power-ok output indicates if phones, PDAs, handheld computers, mobile phone the output voltage is within regulation. base stations, Bluetooth portable radios and accesso- The AS1361/AS1362 requires only 1F output capacitor ries, wireless LANs, digital cameras, personal audio for stability at any load. When the LDO is disabled, cur- devices, and any other portable, battery-powered appli- rent consumption drops below 500nA. cation. The devices are available in a TSOT23 6-pin package. Figure 1. Typical Application Circuit Input Output 2 to 5.5V 1 6 1.5 to 4.5V IN OUT IN 1 6OUT CIN 1F 100k 3 AS1361/ 4 On AS1361/ GND 2 5 BYPASS Off AS1362 SHDNN POK AS1362 CBYPASS 10nF 5 SHDNN 3 4POK 2 BYPASS COUT GND 1F www.austriamicrosystems.com Revision 1.03 1 - 15AS1361/AS1362 Datasheet - Pinout 4 Pinout Pin Assignments Figure 2. Pin Assignments (Top View) IN 1 6OUT AS1361/ GND 2 5 BYPASS AS1362 SHDNN 3 4POK TSOT23 6-pin Pin Descriptions Table 2. Pin Descriptions Pin Number Pin Name Description Unregulated Input Supply. 1IN Ground 2GND Shutdown. Pull this pin low to disable the LDO. 3 SHDNN Power-OK Output. Active-Low, open-drain output indicates if the output voltage is within regulation. 4POK 0 = VOUT <94% VOUTNOM 1 = VOUT >94% VOUTNOM Noise Bypass for Low-Noise Operation. Connect a 10nF capacitor from this pin to OUT. 5 BYPASS Note: This pin is shorted to GND in shutdown mode. Regulated Output Voltage. Bypass this pin with a capacitor to GND. See 6OUT Capacitor Selection and Regulator Stability on page 12 for more details. www.austriamicrosystems.com Revision 1.03 2 - 15