參數(shù)資料
型號(hào)： LTC3860IUH#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 1250 kHz SWITCHING FREQ-MAX, PQCC32
封裝： 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD, QFN-32
文件頁(yè)數(shù)： 35/36頁(yè)
文件大小： 436K
代理商： LTC3860IUH#PBF
LTC3860
8
3860fc
PIN FUNCTIONS
VCC (Pin 1): Chip Supply Voltage. Bypass this pin to GND
with a capacitor (0.1μF to 1μF ceramic) in close proximity
to the chip.
FB1 (Pin 2), FB2 (Pin 8): Error Amplier Inverting Inputs.
FB1 or FB2 can be connected to VSNSOUT via a resistor
divider for remote VOUT sensing. The bottom of the divider
should be connected to the SGND pin of the IC. The other
FB, when used, is typically connected to the other VOUT via
a resistor divider, also terminated at the IC SGND pin.
COMP1 (Pin 3), COMP2 (Pin 7): Error Amplier Outputs.
PWM duty cycle increases with this control voltage.
The error ampliers in the LTC3860 are true operational
ampliers with low output impedance. As a result, the
outputs of two active error ampliers cannot be directly
connected together! For multiphase operation, connecting
the FB pin on an error amplier to VCC will three-state
the output of that amplier. Multiphase operation can
then be achieved by connecting all of the COMP pins
together and using one channel as the master and all
others as slaves.
VSNSOUT (Pin 4): Differential Amplier Output.
VSNSN (Pin 5): Remote Sense Differential Amplier
Inverting Input. Connect this pin to sense ground at the
output load.
VSNSP (Pin 6): Remote Sense Differential Amplier
Noninverting Input. Connect this pin to VOUT at the output
load.
FREQ (Pin 10): Frequency Set/Select Pin. If CLKIN is high,
the resistor between this pin and SGND sets the switching
frequency. If CLKIN is low, the logic state of this pin sets
frequency. This pin sources 21μA.
CLKIN (Pin 11): External Clock Synchronization Input
Pin. If an external clock is present at this pin, the switch-
ing frequency will be synchronized to the external clock.
Otherwise, if high, a resistor from FREQ to SGND sets
frequency; if low, FREQ state sets frequency.
CLKOUT (Pin 12): Clock Output Pin. Used to synchronize
other LTC3860s.
PHSMD (Pin 13): Phase Mode Pin. Selects Ch1-Ch2 and
Ch1-CLKOUT phase relationship.
ISNS1N (Pin 21), ISNS2N (Pin 20): Current Sense Am-
plier (–) Input. The (–) input to the current amplier is
normally connected to the respective VOUT.
ISNS1P (Pin 22), ISNS2P (Pin 19): Current Sense Amplier
(+) Input. The (+) input to the current sense amplier is
normally connected to the midpoint of the inductor’s parallel
RC sense circuit or to the node between the inductor and
sense resistor if using a discrete sense resistor.
ILIM1 (Pin 23), ILIM2 (Pin 18): Current Comparator Sense
Voltage Limit Selection Pin. Connect a resistor from this
pin to SGND. This pin sources 20μA. The resultant voltage
sets the threshold for overcurrent protection.
RUN1 (Pin 24), RUN2 (Pin 17): Run Control Inputs. A
voltage above 2.25V on either pin turns on the IC. How-
ever, forcing either of these pins below 2V causes the IC
to shut down that particular channel. There are 1.5μA
pull-up currents for these pins.
PWM1 (Pin 25), PWM2 (Pin 16): (Top) Gate Signal Out-
put. This signal goes to the PWM or top gate input of the
external gate driver or integrated driver MOSFET. This is
a three-state compatible output.
PWMEN1/PWMEN2 (Pin 26/Pin 15): Enable Pin for Non-
Three-State compatible drivers. This pin has an internal
open-drain pull-up to VCC. An external resistor to SGND
is required. This pin is low when the corresponding PWM
pin is high impedance.
PGOOD1 (Pin 27), PGOOD2 (Pin 14): Power Good Pins.
Open-drain outputs that pull to ground when output volt-
age is not in regulation.
IAVG (Pin 28): Average Current Output Pin. A capacitor tied
to ground from this pin stores a voltage proportional to
the master’s instantaneous average current when multiple
outputs are paralleled. Tie the IAVG pin to ground when the
controller drives two independent outputs.
SGND (Pins 29, 30, Exposed Pad Pin 33): Ground. Pins
29, 30 and 33 are electrically connected internally. The
exposed pad must be soldered to the PCB for rated thermal
performance.
VINSNS (Pin 31): VIN Sense Pin. Connects to the VIN
power supply to provide line feedforward compensation.
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