NCP374MU075TXG ON Semiconductor, NCP374MU075TXG Datasheet - Page 7

• Manufacturer Part Number: NCP374MU075TXG
• Description: Current & Power Monitors & Regulators OVP +30 V & -30V W LOAD S
• Manufacturer: ON Semiconductor

Specifications of NCP374MU075TXG

• Rohs: yes
• Product: Current Regulators
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 2.5 V
• Input Voltage Range: 2.5 V to 5.5 V

Operation
when wall adapter or Vbus cable is connected to Vbus pin
of the device. The downstream system (transceiver, CCCV
charger..) are protected up to +30 V if charging voltage
exceeds OVLO threshold (5.77 V). Due to a back to back
architecture, the Vbus pin is also protected against reverse
polarity connection, coming from wrong USB cables. This
negative protection acts down to −30 V.
consumption on IN pin and MSOFETs are turned off (Vbus
cable disconnected)
selecting Vbus mode.
tied low. In this case, MOSFET are turned on and current is
measure in the branch. If the sinking current on the Vbus pin
is above the programmed current on Ilim pin (can be
programmed up to TBD), the Vbus current is regulated
around Iocp during treg time. If the overload is present at the
end of this timer, the Mosfet are turned off and automatic
rearming cycle is activated. With Treg/Trrd cycle until
overload is present.
Over−voltage Lockout (OVLO)
over−voltage coming from USB connector or Wall Adapter,
through Vbus pin , the device has a built−in over−voltage
lock out (OVLO) circuit. During over−voltage condition,
the output remains disabled until the input voltage exceeds
OVLO (Vbus pin).
manufactured. Please contact your ON Semiconductor
representative for further information.
This circuit has a built−in hysteresis to provide noise
immunity to transient
The NCP374 acts as an over−voltage in charge mode,
In disable mode (EN = 1, DIR = 1), there is no current
The NCP374 provides over−current from IN to Vbus by
To active Vbus mode (USB port on), the EN pin must be
To protect the connected system on IN pins, from external
The OVLO comparator is available in all modes.
Additional OVLO thresholds ranging from OVLO can be
FLAG output is tied to low until Vin is higher than OVLO.
conditions.
TYPICAL OPERATING CHARACTERISTICS
http://onsemi.com
7
Over−Current Protection (OCP)
from IN to Vbus port.
regulated when the value, set by external Rlim resistor,
exceeds Ilimit during an internal timer.
allowing to have a maximum OCP value when I lim pin is
directly connected to GND.
the OCP value is decreased. The Rlim tolerance is important
to keep a good accuracy. So a value between 0.1% and 1%
won’t have an impact on the OCP accuracy. Nevertheless,
the higher Rlim value, the lower Over current protection
accuracy.
on a serial resistance. If this voltage drop comes very small,
the offset of the internal comparator will have an impact on
the accuracy. So a division by more than three times with
Rlim will degrade drastically the overcurrent accuracy.
NCP374MU075TXG is:
FLAG output is tied to low, allowing the mController to take
into account the fault event and then disable reverse charge
path.
VBus Mode
(>1.2) and EN must be tied from high to low (< 0.4 V).
the IN, with a 2.5 V minimum voltage and 5.5V maximum
voltage.
available.
This device integrates over current protection function,
That means the current across the internal NMOS is
An internal resistor is placed in series with the pin
By adding external resistors in series with I lim and GND,
Indeed, the current is measured by a voltage comparator
The
During over current event, NMOSes are opened and
To access to the Vbus mode, DIR pin must be tied to high
In that case, the core of the NCP374 will be supplied by
In this state, OCP, OVLO and thermal modes are
current
Rlim(W) + 22150 Iocp * 29035
limit
calculation
formula
for
the