參數(shù)資料
型號(hào)： LTC3618EUF#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 8 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PQCC24
封裝： 4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD, QFN-24
文件頁(yè)數(shù)： 3/24頁(yè)
文件大?。?/td> 603K
代理商： LTC3618EUF#TRPBF
LTC3618
11
3618f
OPERATION
Main Control Loop
The LTC3618 is a dual monolithic step-down DC/DC con-
verter featuring current-mode, constant-frequency opera-
tion. The regulated output voltage of the second step-down
converter is equal to VDDQIN 0.5. An additional internal
amplier provides a VTTR output equal to VDDQIN 0.5,
which is capable of driving a ±10mA load.
During normal operation, the internal top power switch
(P-channel MOSFET) of each channel is turned on at
the beginning of its clock cycle. Current in the inductor
increases until the current comparator trips and turns
off the top power MOSFET. The peak inductor current at
which the current comparator shuts off is controlled by
the voltage on the ITH pin. The error amplier adjusts
the voltage on the ITH pin by comparing the feedback
signals VFBX (derived from an external resistor divider on
the VFB1 pin) with a reference (0.6V for VDDQ, VDDQIN
0.5 for VTT). When the load current increases, it causes a
reduction in the feedback voltage relative to the reference.
The error amplier raises the ITH voltage until the average
inductor current matches the new load current. Typical
voltage range for the ITH pin is from 0.55V to 1.05V with
0.55V corresponding to zero current.
When the top power MOSFET shuts off, the synchronous
power switch (N-channel MOSFET) turns on until either
the current limit is reached or the next clock cycle begins.
The bottom current limit is typically set at –4A for forced
continuous mode and 0A for pulse-skipping mode.
The operating frequency defaults to 2.25MHz when
RT is connected to SVIN, or can be set by an external
resistor connected between the RT pin and ground, or by
a clock signal applied to the MODE/SYNC pin. The switch-
ing frequency can be set from 400kHz to 4MHz (see the
Applications Information section).
Overvoltage and undervoltage comparators pull the PGOOD
output low if the output voltage varies more than ±8%
(typical) from the set point.
VIN Overvoltage Protection
In order to protect the internal power MOSFET devices
against transient voltage spikes, the LTC3618 constantly
monitors the VIN pin for an overvoltage condition. When
VIN rises above 6.5V, the regulator suspends operation
by shutting off the MOSFETs. The regulator executes its
soft-start when exiting an overvoltage condition.
MODE SELECTION
The MODE/SYNC pin is used to select one of two different
operating modes for VDDQ. When the MODE/SYNC pin
is tied to SVIN, pulse-skipping mode is selected, when
it is tied to ground, forced continuous mode is selected
(Figure 1). VTT is always in forced continuous mode.
VTTR Voltage Buffer Output
An internal high accuracy op amp buffer generates
a VTTR pin voltage that is equal to VDDQIN 0.5.
VTTR can source and sink up to 10mA and is stable
with a 0.1μF capacitor. Short circuit current limit is
set around 20mA to prevent damage to the op amp.
The VTTR output is also the reference voltage for VTT.
Therefore, large transients on this pin will impact the
behavior at the VTT output.
Figure 1. VDDQ Modes of Operation
LTC3618
SVIN
VIN
MODE
SGND
0V
LTC3618
SVIN
VIN
MODE
SGND
0V
3618 F01
1a. Pulse-Skipping Mode
1b. Forced Continuous Mode
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參數(shù)描述
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LTC3618IUF#TRPBF 功能描述:IC REG DUAL SYNC 3A BUCK 24QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件
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