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參數(shù)資料
| 型號(hào)： | LTC3610IWP |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC64 |
| 封裝： | 9 X 9 MM, PLASTIC, QFN-64 |
| 文件頁數(shù)： | 22/24頁 |
| 文件大?。?/td> | 388K |
| 代理商： | LTC3610IWP |
LTC3610
3610ff
pin Functions
PGND(Pins1,2,3,56,57,58,59,60,61,62,63,64,
65): Power Ground. Connect this pin closely to the (–)
terminal of CVCC and the (–) terminal of CIN.
SW(Pins4,5,6,7,8,9,10,11,26,55,66): Switch
Node Connection to the Inductor. The (–) terminal of the
bootstrapcapacitorCBalsoconnectshere.Thispinswings
from a diode voltage drop below ground up to VIN.
PVIN(Pins12,13,14,15,16,17,18,19,20,21,22,
23,24,25,67): Main Input Supply. Decouple this pin to
power PGND with the input capacitance CIN.
NC(Pin27): No Connection.
SGND(Pins28,31,32,33,34,40,42,45,46,47,48,
49,50,68): Signal Ground. All small-signal components
and compensation components should connect to this
ground, which in turn connects to PGND at one point.
BOOST (Pin 29): 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(Pin30): 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(Pin35): 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(Pin36): 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(Pin37): Current Limit Range Input. The voltage at
this pin adjusts maximum valley current and can be set
from 0.5V to 0.7V by a resistive divider from INTVCC. It
defaults to 0.7V if the VRNG pin is tied to ground which
results in a typical 19A current limit.
ITH(Pin38):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(Pin39): 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(Pin41):On-TimeCurrentInput.TiearesistorfromVIN
to this pin to set the one-shot timer current and thereby
set the switching frequency.
VFB(Pin43): Error Amplifier Feedback Input. This pin
connects the error amplifier input to an external resistive
divider from VOUT.
EXTVCC(Pin44):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 (Pins 51, 52): Supply Pin for Internal PWM
Controller.
INTVCC(Pins53,54): 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.
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