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参数资料
| 型号： | LTC3891EUDC#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 3 X 4 MM, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 32/32页 |
| 文件大小： | 1931K |
| 代理商： | LTC3891EUDC#PBF |
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LTC3891
9
3891f
PIN FUNCTIONS
PLLIN/MODE (Pin 1/Pin 3): External Synchronization
Input to Phase Detector and Forced Continuous Mode
Input. When an external clock is applied to this pin, the
phase-locked loop will force the rising TG signal to be
synchronized with the rising edge of the external clock,
and the regulator operates in forced continuous mode.
When not synchronizing to an external clock, this input
determines how the LTC3891 operates at light loads. Pull-
ing this pin to ground selects Burst Mode operation. An
internal 100k resistor to ground also invokes Burst Mode
operation when the pin is floated. Tying this pin to INTVCC
forces continuous inductor current operation. Tying this
pin to a voltage greater than 1.2V and less than INTVCC
–1.3V selects pulse-skipping operation.
SGND (Pins 2, 3, Exposed Pad Pin 21/Pins 4, 5,
ExposedPadPin21):Small-signalground,mustberouted
separately from high current grounds to the common
(–) terminals of the CIN capacitor. Pins 2, 3/4, 5, must
both be electrically connected to small signal ground for
proper operation.The exposed pad must be soldered to
PCB ground for rated thermal performance.
RUN (Pin 4/Pin 6): Digital Run Control Input. Forcing this
pin below 1.16V shuts down the controller. Forcing this
pin below 0.7V shuts down the entire LTC3891, reducing
quiescent current to approximately 14A.
SENSE– (Pin 5/Pin 7): The (–) Input to the Differential
Current Comparator. When greater than INTVCC – 0.5V, the
SENSE– pin supplies power to the current comparator.
SENSE+ (Pin 6/Pin 8): The (+) input to the differential
current comparator is normally connected to DCR sensing
networkorcurrentsensingresistor.TheITHpinvoltageand
controlledoffsetsbetweentheSENSE–andSENSE+pinsin
conjunction with RSENSE set the current trip threshold.
VFB (Pin 7/Pin 9): Receives the remotely sensed feed-
back voltage from an external resistive divider across
the output.
ITH (Pin 8/Pin 10): Error Amplifier Outputs and Switching
Regulator Compensation Point. The current comparator
trip point increases with this control voltage.
PGOOD (Pin 9/Pin 11): Open-Drain Logic Output. PGOOD
is pulled to ground when the voltage on the VFB pin is not
within 10% of its set point.
TG (Pin 10/Pin 12): High Current Gate Drives for Top
N-channel MOSFET. This is the output of floating driver
with a voltage swing equal to INTVCC superimposed on
the switch node voltage SW.
SW (Pin 11/ Pin 13): Switch Node Connection to Induc-
tor.
BOOST (Pin 12/Pin 14): Bootstrapped Supply to the Top-
side Floating Driver. A capacitor is connected between the
BOOST and SW pin and a Schottky diode is tied between
the BOOST and INTVCC pins. Voltage swing at the BOOST
pin is from INTVCC to (VIN + INTVCC).
BG (Pin 13/Pin 15): High Current Gate Drive for Bottom
(Synchronous) N-channel MOSFET. Voltage swing at this
pin is from ground to INTVCC.
INTVCC (Pin 14/Pin 16): Output of the Internal Linear
Low Dropout Regulator. The driver and control circuits
are powered from this voltage source. Must be decoupled
to PGND with a minimum of 2.2F ceramic or other low
ESR capacitor. Do not use the INTVCC pin for any other
purpose.
EXTVCC (Pin 15/Pin 17): External Power Input to an
Internal LDO Connected to INTVCC. This LDO supplies
INTVCC power, bypassing the internal LDO powered from
VIN whenever EXTVCC is higher than 4.7V. See EXTVCC
Connection in the Applications Information section. Do
not float or exceed 14V on this pin.
PGND (Pin 16/Pin 18): Driver Power Ground. Connects to
the source of bottom (synchronous) N-channel MOSFET
and the (–) terminal of CIN.
VIN (Pin 17/Pin 19): Main Supply Pin. A bypass capacitor
should be tied between this pin and the SGND pins.
ILIM (Pin 18/Pin 20): Current Comparator Sense Voltage
Range Inputs. Tying this pin to SGND, FLOAT or INTVCC
sets the maximum current sense threshold to one of three
different levels for the comparator.
(QFN/eTSSOP)
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相关代理商/技术参数 |
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