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NCP373MU04TXG Datasheet(PDF) 6 Page - ON Semiconductor

Part # NCP373MU04TXG
Description  Load Switch Function
Download  10 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP373MU04TXG Datasheet(HTML) 6 Page - ON Semiconductor

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NCP373
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ELECTRICAL CHARACTERISTICS Min / Max limits values (−40°C < TA < +85°C) and IN = +5 V (Unless otherwise noted). Typical
values are TA = +25°C
Characteristics
Unit
Max
Typ
Min
Conditions
Symbols
TIMINGS
Vbus MODE
Vbus Disable time
TVbusDIS
From EN = 0.4 V to 1.2 V, to Vbus <
0.3 V. IN = 5 V
2.5
ms
Turn off delay
toff
From IN > OVLO to Vbus ≤ 0.3 V
Vin increasing from 5 V to 8 V at 3 V/ms
1.5
5
ms
CHARGING MODE
Start Up Delay
ton
From Vbus > UVLO to IN = 0.3 V ,
charging mode
15
30
45
ms
FLAG going up Delay
tstart
From IN>0.3V to FLAG = 1.2 V
15
30
45
ms
Turn off delay
toff
From Vbus > OVLO to IN ≤ 0.3 V
Vin increasing from 5 V to 8V at 3V/ms
1.5
5
ms
Alert delay
tstop
From Vbus > OVLO to FLAG ≤ 0.4 V
See Figures 3and 9
Vin increasing from 5 V to 8 V at 3 V/ms
1.5
ms
Disable time
tdis
EN = 1.2 V, From DIR = 0.4 to 1.2 V to
IN ≤ 0.3 V
2.5
ms
NOTE: Electrical parameters are guaranteed by correlation across the full range of temperature.
TYPICAL OPERATING CHARACTERISTICS
Operation
The NCP373acts as an over−voltage in charge mode,
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). Thanks 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.
In disable mode (
EN = 1, DIR = 1), there is no current
consumption on IN pin and MSOFETs are turned off (Vbus
cable disconnected)
The NCP373 provides over−current from IN to Vbus by
selecting Vbus mode.
To active Vbus mode (USB port on), the
EN pin must be
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 400 mA), 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)
To protect the connected system on IN pins, from external
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).
The OVLO comparator is available in all modes.
Additional OVLO thresholds ranging from OVLO can be
manufactured. Please contact your ON Semiconductor
representative for further information.
FLAG output is tied to low until Vin is higher than OVLO.
This circuit has a built−in hysteresis to provide noise
immunity to transient conditions.
Over−Current protection (OCP)
This device integrates over current protection function,
from IN to Vbus port (400 mA version and 1300 mA
version).
That means the current across the internal NMOS is
regulated when the value, set by external Rlim resistor,
exceeds Ilimit during an internal timer.
An internal resistor is placed in series with the pin
allowing to have a maximum OCP value when I lim pin is
directly connected to GND.
By adding external resistors in series with I lim and 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.
Indeed, the current is measured by a voltage comparator
on a serial resistance. If this voltage drop comes very small,
the offset of the internal comparator will have an impact on


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