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ADP196ACPZN-R7 Datasheet(PDF) 10 Page - Analog Devices |
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ADP196ACPZN-R7 Datasheet(HTML) 10 Page - Analog Devices |
10 / 12 page ADP196 Data Sheet Rev. 0 | Page 10 of 12 APPLICATIONS INFORMATION CAPACITOR SELECTION Output Capacitor The ADP196 is designed for operation with small, space-saving ceramic capacitors but functions with most commonly used capacitors when the effective series resistance (ESR) value is carefully considered. The ESR of the output capacitor affects the response to load transients. A typical 1 µF capacitor with an ESR of 0.1 Ω or less is recommended for good transient response. Using a larger value of output capacitance improves the transient response to large changes in load current. Input Bypass Capacitor Connecting at least 1 µF of capacitance from VIN to GND reduces the circuit sensitivity to the PCB layout, especially when high source impedance or long input traces are encountered. When more than 1 µF of output capacitance is required, increase the input capacitance to match it. GROUND CURRENT The major source of ground current in the ADP196 is the internal charge pump for the FET drive circuitry. Figure 22 shows the typical ground current when VEN = VIN and varies from 1.8 V to 5.5 V. 0 5 10 15 20 25 30 35 40 45 50 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VIN (V) 50mA 100mA 200mA 500mA 1000mA 3000mA Figure 22. Ground Current vs. Input Voltage (VIN) for Different Load Currents ENABLE FEATURE The ADP196 uses the EN pin to enable and disable the VOUT pin under normal operating conditions. As shown in Figure 23, when a rising voltage (VEN) on the EN pin crosses the active threshold, VOUT turns on. When a falling voltage (VEN) on the EN pin crosses the inactive threshold, VOUT turns off. 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 0.2 0.4 0.6 0.8 1.0 1.2 ENABLE VOLTAGE (V) VEN FALLING VEN RISING VOUT AT 3.6V Figure 23. Typical EN Pin Operation As shown in Figure 23, the EN pin has built-in hysteresis. The hysteresis prevents on/off oscillations that can occur due to noise on the EN pin as it passes through the threshold points. The EN pin active/inactive thresholds are derived from the VIN voltage; therefore, these thresholds vary with changing input voltage. Figure 24 shows the typical EN active/inactive thresholds when the input voltage varies from 1.8 V to 5.5 V. 0 0.2 0.4 0.6 0.8 1.0 1.2 1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4 INPUT VOLTAGE (V) EN RISE EN FALL Figure 24. Typical EN Thresholds vs. Input Voltage (VIN) |
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