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LM25066PSQX bảng dữ liệu(PDF) 4 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  System Power Management and Protection IC With PMBus
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LM25066
SNVS654J – FEBRUARY 2010 – REVISED DECEMBER 2015
www.ti.com
Pin Functions (continued)
PIN
TYPE
DESCRIPTION
NO.
NAME
An external capacitor connected to this pin sets the insertion time delay, fault timeout
9
TIMER
Timing capacitor
period and restart timing.
An external resistor connected to this pin, in conjunction with the current sense resistor
10
PWR
Power limit set
(RS), sets the maximum power dissipation allowed in the external series pass MOSFET.
An open drain output. This output is high when the voltage at the FB pin is above 1.167 V
and the input supply is within its undervoltage and overvoltage thresholds. Connect via a
11
PGD
POWER GOOD indicator
pullup resistor to the output rail (external MOSFET source) or any other voltage to be
monitored.
Connect to the output rail (external MOSFET source). Internally used to determine the
12
OUT
Output feedback
MOSFET VDS voltage for power limiting, and to monitor the output voltage.
13
GATE
Gate drive output
Connect to the external MOSFET's gate.
The voltage across the current sense resistor (RS) is measured from VIN to this pin. If the
14
SENSE
Current sense input
voltage across RS reaches overcurrent threshold, the load current is limited and the fault
timer activates.
A small ceramic bypass capacitor close to this pin is recommended to suppress transients
15
VIN
Positive supply input
which occur when the load current is switched off.
An external resistor divider from the system input voltage sets the undervoltage turnon
16
UVLO/EN
Undervoltage lockout
threshold. An internal 23-µA current source provides hysteresis. The enable threshold at
the pin is 1.16 V. This pin can also be used for remote shutdown control.
An external resistor divider from the system input voltage sets the overvoltage turnoff
17
OVLO
Overvoltage lockout
threshold. An internal 23-µA current source provides hysteresis. The disable threshold at
the pin is 1.16 V.
18
GND
Circuit ground
Data pin for SMBus. Open-drain output, requires external pullup resistor to Vdd or other
19
SDA
SMBus data pin
voltage source.
Clock pin for SMBus. Open-drain output, requires external pullup resistor to Vdd or other
20
SCL
SMBus clock
voltage source.
Alert pin for SMBus; active low. Open-drain output, requires external pullup resistor to Vdd
21
SMBA
SMBus alert line
or other voltage source.
Internally generated precision 2.73-V reference used for analog to digital conversion.
22
VREF
Internal reference
Connect a 1-µF capacitor on this pin to ground for bypassing.
Connect this to a diode-configured NPN transistor for temperature monitoring. Connect to
23
DIODE
External diode
ground if unused.
24
VAUX
Auxiliary voltage input
Auxiliary pin allows voltage telemetry from an external source. Full scale input of 1.16 V.
Exposed
Exposed pad of WQFN
No internal electrical connections. Solder to the ground plane to reduce thermal
Pad
package
resistance.
4
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Product Folder Links: LM25066


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