参数资料
型号: LTC3868EUFD-1#PBF
厂商: Linear Technology
文件页数: 9/38页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 28-QFN
标准包装: 73
系列: PolyPhase®
PWM 型: 电流模式
输出数: 2
频率 - 最大: 850kHz
占空比: 99.4%
电源电压: 4 V ~ 24 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 28-WFQFN 裸露焊盘
包装: 管件
产品目录页面: 1336 (CN2011-ZH PDF)
LTC3868-1
PIN FUNCTIONS
(QFN/SSOP)
INTV CC (Pin 17/Pin 19): Output of the Internal Linear Low
Dropout Regulator. The driver and control circuits are
powered from this voltage source. Must be decoupled to
power ground with a minimum of 4.7μF ceramic or other
low ESR capacitor. Do not use the INTV CC pin for any
other purpose.
EXTV CC (Pin 18/Pin 20): External Power Input to an
Internal LDO Connected to INTV CC . This LDO supplies
INTV CC power, bypassing the internal LDO powered from
V IN whenever EXTV CC is higher than 4.7V. See EXTV CC
Connection in the Applications Information section. Do
not exceed 14V on this pin.
PGND (Pin 19/Pin 21): Driver Power Ground. Connects to
the sources of bottom (synchronous) N-channel MOSFETs
and the (–) terminal(s) of C IN .
V IN (Pin 20/Pin 22): Main Supply Pin. A bypass capaci-
tor should be tied between this pin and the signal ground
pin.
BG1, BG2 (Pin 21, Pin 16/Pin 23, Pin 18): High Current
Gate Drives for Bottom (Synchronous) N-Channel
MOSFETs. Voltage swing at these pins is from ground
to INTV CC .
BOOST1, BOOST2 (Pin 22, Pin 15/Pin 24, Pin 17): Boot-
strapped Supplies to the Topside Floating Drivers. Capacitors
are connected between the BOOST and SW pins and
Schottky diodes are tied between the BOOST and INTV CC
pins. Voltage swing at the BOOST pins is from INTV CC to
(V IN + INTV CC ).
TG1, TG2 (Pin 24, Pin 13/Pin 26, Pin 15): High Current
Gate Drives for Top N-Channel MOSFETs. These are the
outputs of ?oating drivers with a voltage swing equal to
INTV CC – 0.5V superimposed on the switch node voltage
SW.
PGOOD1 (Pin 25/Pin 27): Open-Drain Logic Output.
PGOOD1 is pulled to ground when the voltage on the V FB1
pin is not within ±10% of its set point.
SS1, SS2 (Pin 26, Pin 12/Pin 28, Pin 14): External Soft-
Start Input. The LTC3868-1 regulates the V FB1,2 voltage
to the smaller of 0.8V or the voltage on the SS1,2 pin. An
internal 1μA pull-up current source is connected to this
pin. A capacitor to ground at this pin sets the ramp time
to ?nal regulated output voltage. This pin is also used as
the short-circuit latchoff timer.
I TH1 , I TH2 (Pin 27, Pin 11/Pin 1, Pin 13): Error Ampli?er
Outputs and Switching Regulator Compensation Points.
Each associated channel’s current comparator trip point
increases with this control voltage.
V FB1 , V FB2 (Pin 28, Pin 10/Pin 2, Pin 12): Receives the
remotely sensed feedback voltage for each controller from
an external resistive divider across the output.
SENSE1 + , SENSE2 + (Pin 1, Pin 9/Pin 3, Pin 11): The (+)
input to the differential current comparators are normally
connected to DCR sensing networks or current sensing
resistors. The I TH pin voltage and controlled offsets between
the SENSE – and SENSE + pins in conjunction with R SENSE
set the current trip threshold.
SW1, SW2 (Pin 23, Pin 14/Pin 25, Pin 16): Switch Node
Connections to Inductors.
38681fd
9
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