NCP349
http://onsemi.com
3
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 V
CC
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) Vmin
in
−0.3 V
Minimum Voltage (All others to GND) Vmin −0.3 V
Maximum Voltage (IN to GND) Vmax
in
30 V
Maximum Voltage (All others to GND) Vmax 7.0 V
Maximum Current (UVLO<V
IN
<OVLO) Imax 2.0 A
Maximum Peak Current (t ≤ 1 ms, T
A
= 85°C) Imax
peak
4.0 A
Thermal Resistance, Junction−to−Air (Note 1) R
q
JA
180 °C/W
Operating Ambient Temperature Range T
A
−40 to +85 °C
Storage Temperature Range T
stg
−65 to +150 °C
Junction Operating Temperature T
J
150 °C
ESD Withstand Voltage (IEC 61000−4−2) (input only) when bypassed with 1.0 mF capacitor
Human Body Model (HBM), Model = 2 (Note 2)
Machine Model (MM) Model = B (Note 3)
Vesd 15 Air, 8.0 Contact
2000
200
kV
V
V
Moisture Sensitivity MSL Level 1 −
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. The R
q
JA
is highly dependent on the PCB heat sink area (connected to pin 7).
2. Human Body Model, 100 pF discharged through a 1.5 kW resistor following specification JESD22/A114.
3. Machine Model, 200 pF discharged through all pins following specification JESD22/A115.
