参数资料
型号: LTC3856EUH#PBF
厂商: Linear Technology
文件页数: 10/40页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 32WFQFN
标准包装: 73
系列: PolyPhase®
PWM 型: 电流模式
输出数: 1
频率 - 最大: 850kHz
占空比: 94%
电源电压: 4.5 V ~ 38 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 32-WFQFN 裸露焊盘
包装: 管件
LTC3856
PIN FUNCTIONS
(TSSOP/QFN)
INTV CC (Pin 29/Pin 21): Internal 5V Regulator Output. The
control circuits are powered from this voltage. Decouple
this pin to PGND with a minimum of 4.7μF low ESR tan-
talum or ceramic capacitor.
V IN (Pin 30/Pin 22): Main Input Supply. Decouple this pin
to PGND with a capacitor (0.1μF to 1μF).
BG1, BG2 (Pins 31, 27/Pins 23, 19): Bottom Gate Driver
Outputs. These pins drive the gates of the bottom N-chan-
nel MOSFETs between INTV CC and PGND.
PGND1, PGND2 (Pins 32, 26) TSSOP Package: Power
Ground Pin. Connect this pin closely to the sources of the
bottom N-channel MOSFETs, the (–) terminal of CV CC and
the (–) terminal of C IN .
BOOST1, BOOST2 (Pins 33, 24/Pins 24, 18): Boosted
Floating Driver Supplies. The (+) terminal of the boot-
strap capacitors connect to these pins. These pins swing
from a diode voltage drop below INTV CC up to V IN +
INTV CC .
SGND/PGND (Exposed Pad Pin 33) QFN Package: Signal
Ground and Power Ground. Connect this pin closely to
the sources of the bottom N-channel MOSFETs, the (–)
terminal of CV CC and the (–) terminal of C IN . All small-signal
components and compensation components should also
connect to this ground.
TG1, TG2 (Pins 35, 23/Pins 25, 17): Top Gate Driver
Outputs. These are the outputs of floating drivers with
a voltage swing equal to INTV CC superimposed on the
switch nodes voltages.
SW1, SW2 (Pins 36, 22/Pins 26, 16): Switch Node
Connections to Inductors. Voltage swing at these pins
is from a Schottky diode (external) voltage drop below
ground to V IN .
CLKOUT (Pin 37/Pin 27): Clock output with phase change-
able by PHASMD to enable usage of multiple LTC3856 ICs
in multiphase systems.
PLLIN (Pin 38/Pin 28): External Synchronization Pin. A
clock on the pin synchronizes the internal oscillator with
the clock on this pin.
SGND (Exposed Pad Pin 39) TSSOP Package: The exposed
pad must be soldered to the PCB.
3856f
 0
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