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AS1353 Datasheet(PDF) 11 Page - ams AG |
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AS1353 Datasheet(HTML) 11 Page - ams AG |
11 / 14 page www.austriamicrosystems.com Revision 1.03 10 - 13 AS1353/AS1356 Data Sheet - Ty pi c al Ap p l ic at i on 9 Typical Application Figure 13. Typical Application Diagrams Capacitor Selection and Regulator Stability Ceramic capacitors are highly recommended as they offer distinct advantages over their tantalum and aluminum elec- trolytic components. For stable operation with load currents up to 150mA over the entire device temperature range, use a 1µF (min) ceramic output capacitor with an ESR <0.2 Ω. Use large output capacitor values (10µF max) to reduce noise and improve load transient-response, stability and power-supply rejection. Note: Some ceramic capacitors exhibit large capacitance and ESR variations with variations in temperature. Z5U and Y5V capacitors may be required to ensure stability at temperatures below TAMB = -10ºC. With X7R or X5R capacitors, a 1µF capacitor should be sufficient at all operating temperatures. Power Supply Rejection Ratio The AS1353/AS1356 are designed to deliver low dropout voltages and low quiescent currents. Power-supply rejection is 60dB (typ) at low frequencies. To improve power supply-noise rejection and transient response, increase the values of the input and output bypass capacitors (see Figure 13). The Typical Operating Characteristics (page 6) show the device line- and load-transient responses. See the Power- Supply Rejection Ratio vs. Frequency graph in the Typical Operating Characteristics section (page 6) for further details. Dropout Voltage For standard products with output voltage greater than the minimum VIN (2.5V), the minimum input-output voltage dif- ferential (dropout voltage) determines the lowest usable supply voltage. This determines the useful end-of-life battery voltage in battery-powered systems. The dropout voltage is a function of the P-MOSFET drain-to-source on-resistance multiplied by the load current, and is calculated by: VDROPOUT = VIN - VOUT = RDS(ON) x IOUT (EQ 3) Where: RDS(ON) is the drain-to-source on-resistance. IOUT is the supply current. See Typical Operating Characteristics (page 6) for further information. AS1356 SHDNM IN OUT POK CIN 1µF +2.5 to +5.5V COUT 1µF 100k Ω On Off Preset Output 1.5 to 3.6V, 150mA To Micro- processor AS1353 BP CBP 0.01µF SHDNM IN OUT CIN 1µF +2.5 to +5.5V COUT 1µF On Off Preset Output 1.5 to 3.6V, 150mA GND GND |
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