參數(shù)資料
型號(hào)： LTC4227CGN-2#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： POWER SUPPLY MANAGEMENT CKT, PDSO16
封裝： 0.150 INCH, PLASTIC, SSOP-16
文件頁(yè)數(shù)： 18/20頁(yè)
文件大?。?/td> 307K
代理商： LTC4227CGN-2#TRPBF
LTC4227-1/LTC4227-2
7
422712f
pin FuncTions
HGATE: Hot Swap MOSFET Gate Drive Output. Connect
this pin to the gate of the external N-channel MOSFET for
HotSwapcontrol.Aninternal10Acurrentsourcecharges
the MOSFET gate. An internal clamp limits the gate volt-
age to 12V above and a diode voltage below OUT. During
turn-off, a 300A pull-down discharges HGATE to ground.
During an output short or INTVCC undervoltage lockout, a
fast 200mA pull-down discharges HGATE to OUT.
IN1, IN2: Positive Supply Input and MOSFET Gate Drive
Return. Connect this pin to the power input side of the
external ideal diode MOSFET. The 5V INTVCC supply is
generated from IN1 and IN2 via an internal diode-OR. The
voltage sensed at this pin is used to control DGATE. The
gate fast pull-down current returns through this pin when
DGATE is discharged.
INTVCC: Internal 5V Supply Decoupling Output. This pin
must have a 0.1F or larger capacitor. An external load of
less than 500A can be connected at this pin.
NC (UFD Package): No Connection. Not internally
connected.
ON: On Control Input. A rising edge above 1.235V turns on
the external Hot Swap MOSFET and a falling edge below
1.155V turns it off. Connect this pin to an external resistive
divider from SENSE+ to monitor the supply undervoltage
condition. Pulling the ON pin below 0.6V resets the elec-
tronic circuit breaker.
OUT: MOSFET Gate Drive Return. Connect this pin to the
output side of the external Hot Swap MOSFET. The gate
fast pull-down current returns through this pin when
HGATE is discharged.
PWRGD: Power Status Output. Open-drain output that is
normally pulled high by a 10A current source to a diode
below INTVCC. It may be pulled above INTVCC using an
external pull-up. It pulls low when the MOSFET gate drive
between HGATE and OUT exceeds the gate-to-source volt-
age of 4.2V. Leave open if unused.
SENSE+: Positive Current Sense Input. Connect this pin to
the diode-OR output of the external ideal diode MOSFETs
and input of the current sense resistor. The voltage sensed
at this pin is used for monitoring the current limit and
also to control DGATE for forward voltage regulation and
reverse turn-off.
SENSE–: Negative Current Sense Input. Connect this pin
to the output of the current sense resistor. The current
limit circuit controls HGATE to limit the voltage between
SENSE+ and SENSE– to 65mV. A circuit breaker trips when
the sense voltage exceeds 50mV for more than a fault filter
delay configured at the TMR pin.
TMR: Timer Capacitor Terminal. Connect a capacitor
between this pin and ground to set a 12ms/F duration
for current limit before the external Hot Swap MOSFET
is turned off. The duration of the off-time is 617ms/F,
resulting in a 2% duty cycle.
相關(guān)PDF資料
PDF描述
LTC4227IGN-1#PBF POWER SUPPLY MANAGEMENT CKT, PDSO16
LTC4227CUFD-1#TRPBF POWER SUPPLY MANAGEMENT CKT, PQCC20
LTC4227CUFD-2#TRPBF POWER SUPPLY MANAGEMENT CKT, PQCC20
LTC4227IGN-1#TRPBF POWER SUPPLY MANAGEMENT CKT, PDSO16
LTC4227CUFD-1#PBF POWER SUPPLY MANAGEMENT CKT, PQCC20
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