參數(shù)資料
型號(hào)： LTC3609IWKG#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PQCC52
封裝： 8 X 7 MM, LEAD FREE, PLASTIC, QFN-52
文件頁(yè)數(shù)： 8/26頁(yè)
文件大小： 414K
代理商： LTC3609IWKG#TRPBF
LTC3609
3609fb
applicaTions inForMaTion
The EXTVCC pin can be used to provide MOSFET gate drive
and control power from the output or another external
source during normal operation. Whenever the EXTVCC
pin is above 4.7V the internal 5V regulator is shut off and
an internal 50mA P-channel switch connects the EXTVCC
pin to INTVCC. INTVCC power is supplied from EXTVCC
until this pin drops below 4.5V. Do not apply more than
7V to the EXTVCC pin and ensure that EXTVCC ≤ VIN. The
following list summarizes the possible connections for
EXTVCC:
1. EXTVCC grounded. INTVCC is always powered from the
internal 5V regulator.
2. EXTVCCconnectedtoanexternalsupply.Ahighefficiency
supply compatible with the MOSFET gate drive require-
ments (typically 5V) can improve overall efficiency.
3. EXTVCC connected to an output derived boost network.
The low voltage output can be boosted using a charge
pump or flyback winding to greater than 4.7V. The system
will start-up using the internal linear regulator until the
boosted output supply is available.
Soft-StartandLatchoffwiththeRUN/SSPin
TheRUN/SSpinprovidesameanstoshutdowntheLTC3609
as well as a timer for soft-start and overcurrent latchoff.
Pulling the RUN/SS pin below 0.8V puts the LTC3609 into
a low quiescent current shutdown (IQ < 30A). Releasing
the pin allows an internal 1.2A current source to charge
up the external timing capacitor, CSS. If RUN/SS has been
pulled all the way to ground, there is a delay before start-
ing of about:
t
V
A
C
s F C
DELAY
SS
=
=
(
)
1 5
1 2
1 3
.
. /
When the voltage on RUN/SS reaches 1.5V, the LTC3609
begins operating with a clamp on ITH of approximately
0.9V. As the RUN/SS voltage rises to 3V, the clamp on ITH
is raised until its full 2.4V range is available. This takes an
additional 1.3s/F, during which the load current is folded
back until the output reaches 75% of its final value.
After the controller has been started and given adequate
time to charge up the output capacitor, CSS is used as a
short-circuittimer.AftertheRUN/SSpinchargesabove4V,
if the output voltage falls below 75% of its regulated value,
then a short-circuit fault is assumed. A 1.8A current then
begins discharging CSS. If the fault condition persists until
the RUN/SS pin drops to 3.5V, then the controller turns
off both power MOSFETs, shutting down the converter
permanently. The RUN/SS pin must be actively pulled
down to ground in order to restart operation.
Theovercurrentprotectiontimerrequiresthatthesoft-start
timing capacitor, CSS, be made large enough to guarantee
that the output is in regulation by the time CSS has reached
the 4V threshold. In general, this will depend upon the
size of the output capacitance, output voltage and load
current characteristic. A minimum soft-start capacitor
can be estimated from:
CSS > COUT VOUT RSENSE (10–4 [F/V s])
Generally 0.1F is more than sufficient.
Overcurrent latchoff operation is not always needed or
desired. Load current is already limited during a short
circuit by the current foldback circuitry and latchoff op-
eration can prove annoying during troubleshooting. The
feature can be overridden by adding a pull-up current
greater than 5A to the RUN/SS pin. The additional cur-
rent prevents the discharge of CSS during a fault and also
shortens the soft-start period. Using a resistor to VIN as
shown in Figure 5a is simple, but slightly increases shut-
down current. Connecting a resistor to INTVCC as shown
in Figure 5b eliminates the additional shutdown current,
but requires a diode to isolate CSS. Any pull-up network
must be able to pull RUN/SS above the 4.2V maximum
threshold of the latchoff circuit and overcome the 4A
maximum discharge current.
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