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YB1220ST26R Datasheet(PDF) 8 Page - YOBON TECHNOLOGIES,INC. |
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YB1220ST26R Datasheet(HTML) 8 Page - YOBON TECHNOLOGIES,INC. |
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8 / 9 page  YB1220 Dual Channel 200mA LDO Regulator YB1220 MRev.1.1 www.yobon.com.tw 8 P-channel MOSFET pass transistor. This provides several advantages over similar designs using a PNP pass transistor, including low operating power and longer battery life. The YB1220 consumes only 90µA around of quiescent current under most conditions. Output Short-Circuit Current Limit The YB1220 includes two current limiters, which monitor and control the pass transistor’s gate voltage, limiting the output current to about 80mA, for example, in a short-circuit output situation. Shutdown The YB1220 also features a low-power shutdown mode. It consists of independent switches to turn off different channel. The two LDOs are allowed to work in both active, only one active or both disabled to keep the lowest current consumption. In the both shutdown mode, the internal functional blocks, such as voltage reference and the error amplifiers, are turned off completely, and the quiescent current is less than 1µA. In the single shutdown mode, the reference circuit and the active side error amplifier remain functional whereas the disabled error amplifier gets into shutdown mode. Thermal Protection Shutdown The thermal protection shutdown function protects the device from operating in over temperature condition. When the junction temperature exceeds +160°C, the thermal sensor signals the shutdown logic, turning off the pass transistor and allowing the IC to cool down. The thermal sensor turns the pass transistor on again after the IC’s junction temperature drops to +140°C. Soft-Start Circuitry The YB1220 includes a soft-start circuitry to limit inrush current at turn-on. During power up, the output capacitor and output load are charged with a reduced output current. Shortly after the initial power up, the soft-start feature is terminated and normal operation is resumed. Application Information Enable/Shutdown The YB1220 comes with an active-high enable pin that allows the regulator to be enabled. Forcing the enable pin low disables the regulator and puts it into the shutdown mode. This pin cannot be left floating as it may cause an undetermined state. Input/Output Capacitor It is recommended to use a 1.0µF capacitor on the YB1220 input and a 1.0µF capacitor on the output. For high regulation performance, larger input capacitor values and lower ESRs provide better noise rejection and line-transient response. The output noise, load-transient response, stability, and power-supply rejection can be improved by using large output capacitors. Low ESR ceramic capacitors provide optimal performance and save space. Transient Response The transient response can be improved by increasing the values of the input and output bypass capacitors, and through passive filtering techniques. |
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