參數(shù)資料
型號： LTC3816IUHF#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PQCC38
封裝： 5 X 7 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38
文件頁數(shù)： 3/44頁
文件大?。?/td> 753K
代理商： LTC3816IUHF#PBF
LTC3816
3816f
pin FuncTions (eTSSOP/QFN)
ISENN (Pin 1/Pin 36): Current Sense Negative Input. Con-
nect this pin to the negative terminal of the current sense
resistor or the negative terminal of the inductor DCR
lowpass filter.
ITCFB(Pin 2/Pin 37): Inductor DCR Temperature Compen-
sation Amplifer Feedback Input. To derive the temperature
compensated voltage dropped across the inductor DCR,
connect a resistor from the SW node to this pin. An NTC
network, in parallel with a capacitor, forms the feedback
path of this amplifier. For applications that use a discrete
resistor for current sensing, replace the NTC network
with a resistor.
ITC (Pin 3/Pin 38): Inductor DCR Temperature Compen-
sation Amplifer Output. The IMON circuitry and the error
amplifierobtainthetemperaturecompensatedDCRvoltage
through this amplifier.
PREIMON (Pin 4/Pin 1): IMON Current Output Setting.
PREIMON is servoed to the ISENN potential. A resistor from
PREIMONtoITCsetstheIMONoutputcurrent.FortheIMVP-6
configuration, connect this pin to INTVCC.
IMON(Pin5/Pin2):IMVP-6/IMVP-6.5ConfigurationSelec-
tionandOutputCurrentMonitor.ConnectthispintoINTVCC
toselecttheIMVP-6configuration.Atstart-up,theswitcher
VOUT is ramped to 1.2V (VBOOT). In deeper sleep mode,
the controller enables the slow VOUT slew rate. Connect a
resistor to VSS(SEN) to select the IMVP-6.5 configuration.
In this case, VBOOT equals 1.1V, slow slew rate is disabled
and the IMON current source is proportional to the load. In
the IMVP-6.5 configuration, this pin is internally clamped
to 1.1V with respect to the VSS(SEN) pin.
RPTC (Pin 6/Pin 3): Nonlinear PTC Thermistor Input.
Connect to a nonlinear PTC thermistor for MOSFET or
inductor temperature sensing. This pin is pulled up by a
100A current source. If the potential at RPTC is higher
than 0.47V, thermal flag VRTT# is pulled low. RPTC is
sensitivetonoisepickup.Avoidcouplinghighfrequency
switching signals to this pin. If required, bypass this
pin with a capacitor to GND.
VRON (Pin 7/Pin 4): Voltage Regulator Enable Input. The
VRON pin power-up threshold is 1.2V. When forced below
0.65V, a power-down sequence is initiated where the
VCC(CORE) output is ramped down near 0V before the IC
is put into a low current shutdown mode. The VRON pin
has an internal 1A pull-up current.
VSS(SEN) (Pin 8/Pin 5): Processor VCC(CORE) Negative
Terminal Voltage Sense. Negative input of the differential
sense amplifier. Connect to the processor VSS(SEN) pin.
VCC(SEN) (Pin 9/Pin 6): Processor VCC(CORE) Positive
Terminal Voltage Sense. Positive input of the differential
sense amplifier. Connect to the processor VCC(SEN) pin.
SERVO (Pin 10/Pin 7): Error Amplifier AC Input. The
controller servos the switcher output voltage to the VID
DAC voltage through the error amplifier.
VFB (Pin 11/Pin 8): Error Amplifier Negative Input Pin.
VFB is servoed to 1.3V.
COMP (Pin 12/Pin 9): Error Amplifier Output. The COMP
pin is connected directly to the error amplifier output and
theinputofthelinefeedforwardcircuit.UseanRCnetwork
between the COMP pin and the VFB pin to compensate
the feedback loop for stability and optimum transient
response.
SS (Pin 13/Pin 10): Soft-Start Input. The SS pin has an
internal 1A current source pull-up. A capacitor connected
to this pin controls the output voltage start-up. SS is
forced low if VRON or PWRGD is low, or if an overvoltage
or overcurrent fault occurs. If the potential at SS is less
than 0.3V, the IMAX sourcing current is reduced to 2.5A
and the current limit threshold is reduced to 25% of its
nominal value.
DPRSLPVR (Pin 14/Pin 11): Deeper Sleep Mode. For the
IMVP-6 configuration, 25s after DPRSLPVR is asserted
high, the controller enables the VOUT slow slew rate tran-
sition. To disable slow slew rate mode, force DPRSLPVR
low. Upon power-up, the DPRSLPVR input is ignored until
PWRGD is asserted.
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