AS1372-WL-12_EK_ST ams

Datasheet AS1372 350mA Dual Rail Linear Regulator 1 General Description 2 Key Features Input Voltage: 0.7V to 4.5V The AS1372 is a Dual Supply Rail Linear Regulator designed for powering very-low voltage circuits from a single Li-Ion cell or 3 cell Bias Supply Voltage: 2.5V to 5.5V NiMH batteries. In the typical post regulation application VBIAS is Output Voltage: 0.5V to 2.2V in 100mV steps directly connected to the battery (range 2.5V...5.5V) and VIN is supplied by the output voltage of a host DC-DC Converter (range Output Voltage Accuracy: 1.5% 0.7V...4.5V). Dropout Voltage 135mV 350mA load The device offers excellent dropout and transient features combined Max. Output Current: 350mA with very low quiescent currents. In shutdown (Enable pin pulled low), the device turns off and reduces quiescent current consumption Load Transient Response: 15mV (typ) to 10nA (typ) at both VBIAS and VIN terminals. Superior Efficiency In shutdown, a 100ohms (typ) discharge path is connected between Low Shutdown Current: 10nA output and ground to provide rapid discharge of the overall load capacitance connected to the AS1372 output terminal. Auto- High PSRR: >80dB 10Hz-1kHz, 60db 100kHz discharge minimizes the possibility that VOUT > VIN during Noise Voltage: 50 VRMS from 10Hz to 100kHz shutdown. When VOUT > VIN, reverse current flows through the Integrated Overtemperature / Overcurrent Protection inherent body diode of the N-channel series pass transistor. Chip Enable Input The AS1372 also features internal protection against over- temperature, over-current and under-voltage conditions. Operating Temperature Range: -40C to +85C The device is available in a tiny 5-bump CS-WLP package and is 5-bumps CS-WLP Package qualified for operation over the -40C to +85C temperature range. The device is available in fixed output voltages from 0.5V up to 2.2V 3 Applications in 100mV steps (50mV from 0.5V to 1.1V). See Ordering Information on page 18. The devices are ideal for powering cordless and mobile phones, MP3 players, PDAs, hand-held computers, digital cameras, and any other hand-held and/or battery-powered device. Figure 1. AS1372 - Typical Application Diagram www.austriamicrosystems.com/LDOs/AS1372 Revision 1.4 1 - 19AS1372 Datasheet - Pin Assignments 4 Pin Assignments Figure 2. Pin Assignments (Top View) 13 2 5 4 4.1 Pin Descriptions Table 1. Pin Descriptions Pin Number Pin Name Description Regulated Output Voltage. Bypass this pin with a capacitor to GND. 1VOUT Ground. 2GND Enable. Pull this pin to low to disable the device. This pin has an internal 1.6M (typ) pull-down 3EN resistor. Bias Supply Voltage. 2.5V to 5.5V, Bypass this pin with a capacitor to GND. 4 VBIAS Unregulated Input Voltage. 0.7V to 4.5V, VIN VBIAS, Bypass this pin with a capacitor to GND. 5VIN www.austriamicrosystems.com/LDOs/AS1372 Revision 1.4 2 - 19