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AS1364-BTDT-AD Datasheet(PDF) 11 Page - ams AG |
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AS1364-BTDT-AD Datasheet(HTML) 11 Page - ams AG |
11 / 20 page AS1364 Datasheet - Detailed Descr i pti on www.austriamicrosystems.com Revision 1.8 10 - 19 8.1 Output Voltage Selection At the factory trimmed versions of the AS1364 offering the bypass pin (see Figure ), the output voltage is then set to an internally trimmed voltage (see Ordering Information on page 18). For the adjustable AS1364-AD, an output voltage between +1.2V and +5V can be set by using two external resistors (see Figure 17). In this mode, VOUT is determined by: (EQ 1) Where: VSET/BYP = 1.2V ±0.03V A simplification of R1 and R2 selection is: (EQ 2) Since the input bias current at SET is less than 100nA, large resistance values can be used for R1 and R2 to minimize power consumption and therefore increasing efficiency. Note: Up to 125k is acceptable for R2. If the SET pin is connected to GND without a resistor, 3.3V will be set as output voltage. In preset voltage mode, the impedance from SET to GND should be less than 10k or spurious conditions may cause the voltage at SET to exceed the 50mV threshold. Figure 17. Adjustable Output Voltage Typical Application 8.2 Shutdown If pin EN is connected to GND the AS1364 is disabled. In shutdown mode all internal circuits are turned off, reducing supply current to 10nA (typ). For normal device operation pin EN must be connected to IN. During shutdown, POK goes low. When in shutdown, a 5k (typ) discharge path is connected between the output pin and ground. 8.3 Power-OK The AS1364 features a power-ok indicator that asserts when the output voltage falls out of regulation. The open-drain POK output goes low when output voltage at OUT falls 6% below its nominal value. A 100k pull-up resistor from POK to a (typically OUT) provides a logic control signal. POK can be used as a power-on-reset (POR) signal to a microcontroller or can drive an external LED to indicate a power failure condition. Note: POK is low during shutdown. VOUT VSETBYP 1 R1 R2 ------ + = R1 R2 VOUT VSETBYP --------------------- 1 – = AS1364 COUT 4.7µF 3 IN 5 OUT 2 EN 7 SET/BYP CIN 4.7µF Reset Output On Off 4 IN 1 POK 6 OUT VOUT VIN R1 R2 8 GND |
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