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NCP349 Dataheets PDF



Part Number NCP349
Manufacturers ON Semiconductor
Logo ON Semiconductor
Description 28V Overvoltage Protection
Datasheet NCP349 DatasheetNCP349 Datasheet (PDF)

NCP349 Positive Overvoltage Protection Controller with Internal Low RON NMOS FET The NCP349 is able to disconnect the systems from its output pin when wrong input operating conditions are detected. The system is positive overvoltage protected up to +28 V. This device uses an internal NMOS and therefore, no external device is necessary, reducing the system cost and the PCB area of the application board. The NCP349 is able to instantaneously disconnect the output from the input, due to integrated.

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NCP349 Positive Overvoltage Protection Controller with Internal Low RON NMOS FET The NCP349 is able to disconnect the systems from its output pin when wrong input operating conditions are detected. The system is positive overvoltage protected up to +28 V. This device uses an internal NMOS and therefore, no external device is necessary, reducing the system cost and the PCB area of the application board. The NCP349 is able to instantaneously disconnect the output from the input, due to integrated Low RON Power NMOS (65 mW), if the input voltage exceeds the overvoltage threshold (OVLO) or falls below the undervoltage threshold (UVLO). At powerup (EN pin = low level), the Vout turns on ton time after the Vin exceeds the undervoltage threshold. The NCP349 provides a negative going flag (FLAG) output, which alerts the system that a fault has occurred. In addition, the device has ESD−protected input (15 kV Air) when bypassed with a 1.0 mF or larger capacitor. Features • Overvoltage Protection up to 28 V • On−Chip Low RDS(on) NMOS Transistor: 65 mW • Internal Charge Pump • Overvoltage Lockout (OVLO) • Undervoltage Lockout (UVLO) • Soft−Start • Alert FLAG Output • Shutdown EN Input • Compliance to IEC61000−4−2 (Level 4) 8.0 kV (Contact) 15 kV (Air) • ESD Ratings: Machine Model = B Human Body Model = 2 • DFN6 1.6x2 mm Package • This is a Pb−Free Device Applications • Cell Phones • Camera Phones • Digital Still Cameras • Personal Digital Applications • MP3 Players http://onsemi.com 6 1 DFN6 MN SUFFIX CASE 506BM MARKING DIAGRAM 1 XX MG G XX = Specific Device Code M = Date Code G = Pb−Free Package PIN CONNECTIONS IN 1 GND 2 FLAG 3 PAD1 IN 6 EN 5 OUT 4 OUT (Top View) ORDERING INFORMATION See detailed ordering, marking and shipping information in the package dimensions section on page 11 of this data sheet. © Semiconductor Components Industries, LLC, 2012 September, 2012 − Rev. 3 1 Q Publication Order Number: NCP349/D NCP349 Wall Adapter − AC/DC − USB 7 1 NCP349 IN OUT IN OUT 5 4 1 mF 6 EN FLAG 3 ENABLE/ GND Microprocessor 2 VBat 10 k CC/CV Charger or System mP 0 Figure 1. Typical Application Circuit BATTERY 0 7 INPUT 1 Gate Driver 4 OUTPUT 5 VREF Charge Pump EN Block UVLO OVLO Control Logic and Timer EN 6 3 FLAG Figure 2. Functional Block Diagram 2 GND http://onsemi.com 2 NCP349 PIN FUNCTION DESCRIPTION Pin No. Symbol Function Description 1, 7 IN INPUT Input Voltage Pins. These pins are connected to the Wall Adapoter (AC−DC, Vbus ..). A 1 mF low ESR ceramic capacitor, or larger, must be connected between these pins and GND, as close as possible to the DUT. The two IN pins must be connected together to power supply. (See PCB recommendation for the pin7). 2 GND POWER Ground 3 FLAG OUTPUT Fault Indication Pin. This pin allows an external system to detect a fault on the IN pins. The FLAG pin goes low when input voltage exceeds OVLO threshold or drops below UVLO threshold. Since the FLAG pin is open drain functionality, an external pull−up resistor to VCC must be added. (Minimum 10 kW). 4, 5 OUT OUTPUT Output Voltage Pins. These pins follow IN pins when “no fault” is detected. The two OUT pins must be hardwired together. 6 EN INPUT Enable Pin. The device enters in shutdown mode when this pin is tied to a high level. In this case the output is disconnected from the input. To allow normal functionality, the EN pin shall be connected to GND to a pull down or to a I/O pin. This pin does not have an impact on the fault detection. MAXIMUM RATINGS Rating Symbol Value Unit Minimum Voltage (IN to GND) Minimum Voltage (All others to GND) Vminin Vmin −0.3 −0.3 V V Maximum Voltage (IN to GND) Maximum Voltage (All others to GND) Vmaxin Vmax 30 7.0 V V Maximum Current (UVLO


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