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参数资料
| 型号： | LTC3610IWP#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PQCC64 |
| 封装： | 9 X 9 MM, PLASTIC, QFN-64 |
| 文件页数： | 2/24页 |
| 文件大小： | 388K |
| 代理商： | LTC3610IWP#TR |
LTC3610
0
3610ff
applications inForMation
The basic LTC3610 application circuit is shown on the
frontpageofthisdatasheet.Externalcomponentselection
is primarily determined by the maximum load current.
The LTC3610 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 LTC3610 has an open-drain PGOOD output that
indicates when the output voltage is within ±10% of the
regulation point. The LTC3610 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 LTC3610 can deliver. The
maximum output current is given by:
IOUT(MAX) = IVALLEY(MAX) + 1/2 ΔIL
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 0.5V to 1V, 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 trade-off 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 LTC3610 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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