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ADP196 Arkusz danych(PDF) 9 Page - Analog Devices

Numer części ADP196
Szczegółowy opis  5 V, 3 A, Logic Controlled High-Side Power Switch
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ADP196 Arkusz danych(HTML) 9 Page - Analog Devices

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Data Sheet
ADP196
Rev. 0 | Page 9 of 12
THEORY OF OPERATION
The ADP196 is a high-side NMOS load switch controlled by an
internal charge pump. The ADP196 is designed to operate with
power supply voltages from 1.8 V to 5.5 V.
An internal charge pump biases the NMOS switch to achieve a
relatively constant, ultralow on resistance of 10 mΩ across the
entire input voltage range (6-ball WLCSP package). The use of the
internal charge pump also allows for controlled turn-on times.
Turning the NMOS switch on and off is controlled by the enable
input, EN, which is capable of interfacing directly to 1.2 V logic
signals.
GND
EN
VIN
VOUT
CHARGE PUMP
OVERCURRENT AND
SLEW RATE CONTROL
OVERTEMPERATURE
PROTECTION
QOD ADP196-01 ONLY
Figure 21. Functional Block Diagram
The ADP196 supports 3 A of continuous current as long as TJ is
less than 70°C. At 85°C, the rated current decreases to 2.22 A.
Overcurrent protection limits the output current to 4 A.
The overtemperature protection circuit is activated if the load
current causes the junction temperature to exceed 125°C. When
this occurs, the overtemperature protection circuitry disables
the output until the junction temperature falls below approximately
110°C, at which point the output is reenabled. If the fault condition
persists, the output cycles off and on until the fault is removed.
Additional protection is provided by an overcurrent limit that
forces the device into a constant current mode of operation.
The ADP196-01 incorporates a quick output discharge (QOD)
circuit to discharge the output capacitance when the ADP196-01
output is disabled.
ESD protection structures are shown in the block diagram as
Zener diodes (see Figure 21).
The ADP196 is a low quiescent current device with a nominal
4 MΩ pull-down resistor on its enable pin (EN).
The ADP196 is available in a space-saving 1.0 mm × 1.5 mm,
0.5 mm pitch, 6-ball WLCSP and a tiny 2.0 mm × 2.0 mm ×
0.55 mm, 0.65 mm pitch, 6-lead LFCSP.


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