參數(shù)資料
型號(hào)： LTC3586EUFE#PBF
廠(chǎng)商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 3 A BATTERY CHARGE CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PQCC38
封裝： 4 X 6 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-38
文件頁(yè)數(shù)： 15/36頁(yè)
文件大?。?/td> 317K
代理商： LTC3586EUFE#PBF
LTC3586/LTC3586-1
22
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Buck Regulator Dropout Operation
It is possible for a buck regulator’s input voltage, VINx, to
approach its programmed output voltage (e.g., a battery
voltage of 3.4V with a programmed output voltage of 3.3V).
When this happens, the PMOS switch duty cycle increases
until it is turned on continuously at 100%. In this dropout
condition, the respective output voltage equals the buck
regulator’s input voltage minus the voltage drops across
the internal P-channel MOSFET and the inductor.
Buck Regulator Soft-Start Operation
Soft-start is accomplished by gradually increasing the
peak inductor current for each buck regulator over a 500μs
period. This allows each output to rise slowly, helping
minimize the battery in-rush current. A soft-start cycle
occurs whenever a given buck regulator is enabled, or
after a fault condition has occurred (thermal shutdown
or UVLO). A soft-start cycle is not triggered by changing
operating modes. This allows seamless output operation
when transitioning between modes.
Buck Regulator Switching Slew Rate Control
The buck regulators contain new patent pending circuitry
to limit the slew rate of the switch node (SW1 and SW2).
This new circuitry is designed to transition the switch node
over a period of a couple of nanoseconds, signicantly
reducing radiated EMI and conducted supply noise.
BUCK-BOOST DC/DC SWITCHING REGULATOR
The LTC3586/LTC3586-1 contain a 2.25MHz constant-
frequency voltage-mode buck-boost switching regulator.
The regulator provides up to 1A of output load current.
The buck-boost can be programmed to a minimum output
voltage of 2.5V and can be used to power a microcon-
troller core, microcontroller I/O, memory, disk drive, or
other logic circuitry. The converter is enabled by pulling
EN3 high. To suit a variety of applications, a selectable
mode function allows the user to trade-off noise for ef-
ciency. Two modes are available to control the operation
of the LTC3586/LTC3586-1’s buck-boost regulator. At
moderate to heavy loads, the constant frequency PWM
mode provides the least noise switching solution. At
lighter loads Burst Mode operation may be selected. The
output voltage is programmed by a user-supplied resistive
divider returned to FB3. An error amplier compares the
divided output voltage with a reference and adjusts the
compensation voltage accordingly until the FB3 pin has
stabilized to the reference voltage (0.8V). The buck-boost
regulator includes a soft-start to limit inrush current and
voltage overshoot when powering on, short-circuit cur-
rent protection, and switch node slew limiting circuitry
for reduced radiated EMI.
Input Current Limit
The input current limit comparator will shut the input
PMOS switch off once current exceeds 2.5A (typical). The
2.5A input current limit also protects against a grounded
VOUT3 node.
Output Overvoltage Protection
If the FB3 node were inadvertently shorted to ground, then
the output would increase indenitely with the maximum
current that could be sourced from VIN3. The LTC3586/
LTC3586-1 protect against this by shutting off the input
PMOS if the output voltage exceeds 5.6V (typical).
Low Output Voltage Operation
When the output voltage is below 2.65V (typical) during
start-up, Burst Mode operation is disabled and switch D
is turned off (allowing forward current through the well
diode and limiting reverse current to 0mA).
Buck-Boost Regulator PWM Operating Mode
In PWM mode the voltage seen at FB3 is compared to the
reference voltage (0.8V). From the FB3 voltage an error
amplier generates an error signal seen at VC3. This error
signal commands PWM waveforms that modulate switches
A, B, C, and D. Switches A and B operate synchronously
as do switches C and D. If VIN3 is signicantly greater
than the programmed VOUT3, then the converter will op-
erate in buck mode. In this case switches A and B will be
modulated, with switch D always on (and switch C always
off), to step-down the input voltage to the programmed
output. If VIN3 is signicantly less than the programmed
VOUT3, then the converter will operate in boost mode. In
this case switches C and D are modulated, with switch A
OPERATION
相關(guān)PDF資料
PDF描述
LTC3586EUFE-1#PBF BATTERY CHARGE CONTROLLER, PQCC38
LTC3586EUFE-1#TRPBF BATTERY CHARGE CONTROLLER, PQCC38
LTC3672BEDC-1#PBF 1.1 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO8
LTC3728LZEUH 3 A DUAL SWITCHING CONTROLLER, 590 kHz SWITCHING FREQ-MAX, PQCC28
LTC3773EUHF SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PQCC38
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3586EUFE-TRPBF 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:High Effi ciency USB Power Manager with Boost, Buck-Boost and Dual Bucks
LTC3588-1 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Ultralow Voltage Step-Up Converter
LTC3588-2 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:400mA Step-Up DC/DC Converter with Maximum Power Point Control and 250mV Start-Up
LTC3588-2_10 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Piezoelectric Energy Harvesting Power Supply with 14V Minimum VIN
LTC3588EDD-1#PBF 功能描述:IC ENERGY HARVESTING PSU 10DFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電源管理 - 專(zhuān)用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 應(yīng)用:熱電冷卻器 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:28-SOIC（0.173"，4.40mm 寬）裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:28-TSSOP 裸露焊盤(pán) 包裝:管件 產(chǎn)品目錄頁(yè)面:1410 (CN2011-ZH PDF)
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