參數(shù)資料
型號(hào)： LTC3609IWKG#PBF
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)： 3/26頁(yè)
文件大?。?/td> 414K
代理商： LTC3609IWKG#PBF
LTC3609
3609fb
applicaTions inForMaTion
The basic LTC3609 application circuit is shown on the
frontpageofthisdatasheet.Externalcomponentselection
is primarily determined by the maximum load current.
The LTC3609 uses the on-resistance of the synchronous
power MOSFET for determining the inductor current. The
desiredamountofripplecurrentandoperatingfrequency
alsodeterminestheinductorvalue.Finally,CINisselected
for its ability to handle the large RMS current into the
converterandCOUTischosenwithlowenoughESRtomeet
the output voltage ripple and transient specification.
VONandPGOOD
The LTC3609 has an open-drain PGOOD output that
indicates when the output voltage is within ±10% of the
regulation point. The LTC3609 also has a VON pin that
allows the on-time to be adjusted. Tying the VON pin high
results in lower values for RONwhichisusefulinhighVOUT
applications. The VON pin also provides a means to adjust
the on-time to maintain constant frequency operation in
applications where VOUT changes and to correct minor
frequency shifts with changes in load current.
VRNGPinandILIMITAdjust
The VRNG pin is used to adjust the maximum inductor
valley current, which in turn determines the maximum
average output current that the LTC3609 can deliver. The
maximum output current is given by:
IOUT(MAX) = IVALLEY(MAX) + 1/2 IL
The IVALLEY(MAX) is shown in the figure “Maximum Valley
Current Limit vs VRNG Voltage” in the Typical Performance
Characteristics.
An external resistor divider from INTVCC can be used to
set the voltage on the VRNG pin from 0.7V to 1.2V, or it can
be simply tied to ground force a default value equivalent
to 0.7V. When setting current limit, ensure that the junc-
tion temperature does not exceed the maximum rating of
125°C. Do not float the VRNG pin.
OperatingFrequency
The choice of operating frequency is a tradeoff between
efficiency and component size. Low frequency operation
improvesefficiencybyreducingMOSFETswitchinglosses
but requires larger inductance and/or capacitance in order
to maintain low output ripple voltage.
The operating frequency of LTC3609 applications is de-
termined implicitly by the one-shot timer that controls the
on-time, tON, of the top MOSFET switch. The on-time is
set by the current into the ION pin and the voltage at the
VON pin according to:
t
V
I
pF
ON
VON
ION
=
(
)
10
Tying a resistor RON from VIN to the ION pin yields an
on-time inversely proportional to VIN. The current out of
the ION pin is:
I
V
R
ION
IN
ON
=
For a step-down converter, this results in approximately
constant frequency operation as the input supply varies:
f
V
R
pF
H
OUT
VON ON
Z
=
(
)
[ ]
10
Toholdfrequencyconstantduringoutputvoltagechanges,
tie the VON pin to VOUT or to a resistive divider from VOUT
when VOUT > 2.4V. The VON pin has internal clamps that
limit its input to the one-shot timer. If the pin is tied below
0.7V,theinputtotheone-shotisclampedat0.7V.Similarly,
if the pin is tied above 2.4V, the input is clamped at 2.4V.
In high VOUT applications, tying VON to INTVCC so that the
comparator input is 2.4V results in a lower value for RON.
Figures 1a and 1b show how RON relates to switching
frequency for several common output voltages.
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