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| 型號： | LTC3880EUJ-1#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, LEAD FREE, PLASTIC, WJJD-2, QFN-40 |
| 文件頁數(shù)： | 30/112頁 |
| 文件大?。?/td> | 2182K |
| 代理商： | LTC3880EUJ-1#TRPBF |
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LTC3880/LTC3880-1
24
3880fa
OPERATION
SERIAL INTERFACE
The LTC3880 serial interface is a PMBus compliant slave
device and can operate at any frequency between 10kHz
and 400kHz. The address is configurable using either the
NVMoranexternalresistordivider.InadditiontheLTC3880
always responds to the global broadcast address of 0x5A
(7 bit) or 0x5B (7 bit). Address 0x5A is not paged and
is performed on both channels. 0x5B respects the page
command. Because address 0x5A does not support page,
it can not be used for any paged reading commands.
Theserialinterfacesupportsthefollowingprotocolsdefined
in the PMBus specifications: 1) send command, 2) write
byte, 3) write word, 4) group, 5) read byte, 6) read word
and 7) read block. All read operations will return a valid
PECifthePMBusmasterrequestsit.IfthePEC_REQUIRED
bit is set in the MFR_CONFIG_ALL_LTC3880 command,
the PMBus write operations will not be acted upon until
a valid PEC has been received by the LTC3880.
Communication Failure
PEC write errors (if PEC_REQUIRED is active), attempts
to access unsupported commands, or writing invalid data
to supported commands will result in a CML fault. The
CML bit is set in the STATUS_BYTE and STATUS_WORD
commands, the appropriate bit is set in the STATUS_CML
command, and the ALERT pin is pulled low.
DEVICE ADDRESSING
The LTC3880 offers five different types of addressing over
the PMBus interface, specifically: 1) global, 2) device, 3)
channel, 4) rail addressing and 5) alert response address
(ARA).
GlobaladdressingprovidesameansofthePMBusmasterto
addressallLTC3880devicesonthebus.TheLTC3880global
address is fixed 0x5A (7 bit) or 0xB4 (8 bit) and cannot be
disabled. Commands sent to the global address act the
sameasifPAGEissettoavalueof0xFF.Commandssentare
writtentobothchannelssimultaneously.Globalcommand
0x5B (7 bit) or 0xB6 (8 bit) is paged and allows channel
specific command of all LTC3880 devices on the bus.
Device addressing provides the standard means of the
PMBus master communicating with a single instance
of an LTC3880. The value of the device address is set
by a combination of the ASEL configuration pin and the
MFR_ADDRESS command. When this addressing means
is used, the PAGE command determines the channel being
acted upon. Device addressing can be disabled by writing
a value of 0x80 to the MFR_ADDRESS.
Channel addressing provides a means of the PMBus
master addressing a single channel of the LTC3880
without using the PAGE command. The value assigned
to the paged MFR_CHANNEL_ADDRESS determines the
specific channel the user wishes to act upon. Example: If
MFR_CHANNEL_ADDRESS for page 0 is set to 0x57 and
the MFR_CHANNEL_ADDRESS for page 1 is set to 0x54,
theusercanaddresschannel0ofthedevicebyperforming
PMBus device commands using address 0x57 (7 bit). The
user can address channel 1 of the device by performing
PMBus device commands using address 0x54 (7 bit). This
eliminatestheuserfromfirstassigningthePAGEcommand
and then the command to be acted upon.
Rail addressing provides a means of the PMBus master
addressingasetofchannelsconnectedtothesameoutput
rail, simultaneously. This is similar to global addressing,
however, the PMBus address can be dynamically assigned
by using the MFR_RAIL_ADDRESS command. The MFR_
RAIL_ADDRESS is paged, so channels can be indepen-
dentlyassignedtoaspecificrail.Itisrecommendedthatrail
addressingshouldbelimitedtocommandwriteoperations.
All five means of PMBus addressing require the user to
employdisciplinedplanningtoavoidaddressingconflicts.
RESPONSES TO VOUT AND IOUT FAULTS
VOUTOVandUVconditionsaremonitoredbycomparators.
The OV and UV limits are set in three ways.
n
As a Percentage of the VOUT if Using the Resistor Con-
figuration Pins
n
In NVM if Either Programmed at the Factory or Through
the GUI
n
By PMBus Command
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| LTC3880IUJ-1#PBF | 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40 |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3880IUJ#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC3880IUJ#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC3880IUJ-1#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC3880IUJ-1#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC3883EUH#PBF | 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN 制造商:Linear Technology 功能描述:BUCK CNTRL 24V 1MHZ 0.5/5.5V 32QFN 制造商:Linear Technology 功能描述:BUCK, CNTRL, 24V, 1MHZ, 0.5/5.5V, 32QFN 制造商:Linear Technology 功能描述:PWM CONTROLLER, BUCK, 1MHZ, 24V, QFN-32, Input Voltage:24V, Output Voltage:5.5V, Output Current:30A, Supply Voltage Min:4.5V, Supply Voltage Max:24V, Digital IC Case Style:QFN, No. of Pins:32, Frequency:1MHz, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Digitally Programmable, Multiphase Step-Down DC/DC Controll |
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