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NCV8800SDW33 Datasheet(PDF) 8 Page - ON Semiconductor |
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NCV8800SDW33 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 12 page NCV8800 Series http://onsemi.com 8 CIRCUIT DESCRIPTION ENABLE The NCV8800 remains in sleep mode drawing less than 25 µA of quiescent current until the ENABLE pin is brought high powering up the device. There are two options available for the ENABLE feature. • Option 1 (Sequenced). The output voltage tracks the ENABLE pin with a maximum delta voltage between them (reference the Output Tracking specs in the Electrical Characteristics). This allows the device to be used with microprocessors requiring dual supply voltages. One voltage is typically needed to power the core of the microprocessor, and another high voltage is needed to power the microprocessor I/O. • Option 2 (High Voltage). This option removes the sequencing feature above, and allows the device to be controlled up to the battery voltage on the ENABLE pin with an external resistor (10 k). See Figure 5. Figure 5. Switched Battery Application ENABLE VIN VBAT 10 k AUXILIARY The AUXILIARY pin provides an alternate path for the IC to maintain operation. The AUXILIARY pin is diode OR’d with the VIN pin to the control circuitry (the DMOS output drivers are not included). If the voltage (VIN) from the battery dips as low as 3.5 V during a crank condition, the NCV8800 will maintain operation through a 6.0 V(min) connection on the AUXILIARY pin. Using this feature is optional. This pin should be grounded when not in use. VIN Normal supply voltage input. An external diode must be provided to afford reverse battery protection. SWITCH DMOS output drivers with 0.75 Ω max push/pull capability. Non−overlap logic is provided to guarantee shoot through current is minimized. RESET The RESET is an open drain output which goes low when the feedback voltage on FB1 and FB2 goes below the undervoltage RESET threshold. The output also goes low when the voltage on FB1 and FB2 exceeds the overvoltage RESET threshold. The RESET output is an open drain output capable of sinking 1.6 mA. FB1 and FB2 FB1 and FB2 are the feedback pins to the error amplifier, which control the output SWITCH as needed to the regulated output. They are internally wire bonded to the same electrical connection providing double protection for an open circuit which would cause the buck regulator to rise above its desired output reaching the voltage on VIN. These pins also provide the feedback path for the RESET function. DELAY There are two options for the delay time for the RESET to go low. Connecting the pin to GND will provide a minimum of 14 ms. Connecting the pin to FB1 and FB2 will provide a minimum of 28 ms. Absolute max voltage on the DELAY pin is 7.0 V. Use a resistor divider to run off higher voltages. The 7.5 V option will require this divider (see Figure 6). Figure 6. DELAY (7.0 V max) VOUT COMP The COMP pin provides access to the error amplifiers output. Switching power supplies work as feedback control systems, and require compensation for stability. A 1.0 k resistor and 0.1 µF capacitor work well in the application in Figure 2. CP The on−chip DMOS drivers require the gates of the devices to be pulled above their drain voltage. An external capacitor located between the SWITCH output, and the CP pin provides the charge pump action to drive the gate of the high−side driver high enough to turn the device on. |
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Similar Description - NCV8800SDW33 |
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