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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 |
| 文件頁數(shù)： | 25/26頁 |
| 文件大小： | 414K |
| 代理商： | LTC3609IWKG#PBF |
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LTC3609
3609fb
pin FuncTions
PVIN(Pins1,2,3,4,5,6,7,48,49,50,51,52,53):
Main Input Supply. Decouple this pin to power PGND with
the input capacitance, CIN.
SW(Pins8,33,41,42,43,44,45,46,47,55): Switch
Node Connection to the Inductor. The (–) terminal of the
bootstrapcapacitor,CB,alsoconnectshere.Thispinswings
from a diode voltage drop below ground up to VIN.
NC(Pins9,21,24,25,28): No Connection.
SGND(Pins10,14,15,20,26,27,54):SignalGround.All
small-signal components and compensation components
should connect to this ground, which in turn connects to
PGND at one point.
BOOST(Pin11): Boosted Floating Driver Supply. The (+)
terminal of the bootstrap capacitor, CB, connects here.
This pin swings from a diode voltage drop below INTVCC
up to VIN + INTVCC.
RUN/SS(Pin12): Run Control and Soft-Start Input. A
capacitor to ground at this pin sets the ramp time to full
output current (approximately 3s/F) and the time delay
for overcurrent latchoff (see Applications Information).
Forcing this pin below 0.8V shuts down the device.
VON(Pin13): On-Time Voltage Input. Voltage trip point for
the on-time comparator. Tying this pin to the output volt-
age or an external resistive divider from the output makes
the on-time proportional to VOUT. The comparator input
defaults to 0.7V when the pin is grounded and defaults to
2.4V when the pin is tied to INTVCC. Tie this pin to INTVCC
in high VOUT applications to use a lower RON value.
PGOOD(Pin16): Power Good Output. Open-drain logic
output that is pulled to ground when the output voltage
is not within ±10% of the regulation point.
VRNG(Pin17): Current Limit Range Input. The voltage at
this pin adjusts maximum valley current and can be set
from 0.7V to 1.2V by a resistive divider from INTVCC. It
defaults to 0.7V if the VRNG pin is tied to ground which
results in a typical 9A current limit.
ITH(Pin18):CurrentControlThresholdandErrorAmplifier
Compensation Point. The current comparator threshold
increases with this control voltage. The voltage ranges
from 0V to 2.4V with 0.8V corresponding to zero sense
voltage (zero current).
FCB(Pin19): Forced Continuous Input. Tie this pin to
ground to force continuous synchronous operation at low
load, to INTVCCtoenablediscontinuousmodeoperationat
low load or to a resistive divider from a secondary output
when using a secondary winding.
ION(Pin22):On-TimeCurrentInput.TiearesistorfromVIN
to this pin to set the one-shot timer current and thereby
set the switching frequency.
VFB(Pin23): Error Amplifier Feedback Input. This pin
connects the error amplifier input to an external resistive
divider from VOUT.
EXTVCC(Pin29):ExternalVCCInput.WhenEXTVCCexceeds
4.7V, an internal switch connects this pin to INTVCC and
shuts down the internal regulator so that controller and
gate drive power is drawn from EXTVCC. Do not exceed
7V at this pin and ensure that EXTVCC < VIN.
SVIN(Pin30): Supply Pin for Internal PWM Controller.
INTVCC(Pins31,32): Internal 5V Regulator Output. The
driver and control circuits are powered from this voltage.
Decouple this pin to power ground with a minimum of
4.7F low ESR tantalum or ceramic capacitor.
PGND(Pins34,35,36,37,38,39,40): Power Ground.
Connect this pin closely to the (–) terminal of CVCC and
the (–) terminal of CIN.
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