參數(shù)資料
型號(hào)： LTC3880EUJ-1#PBF
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(yè)數(shù)： 33/112頁(yè)
文件大?。?/td> 2182K
代理商： LTC3880EUJ-1#PBF
LTC3880/LTC3880-1
27
3880fa
OPERATION
log data is erased, or else the part will immediately issue
another fault log.
When the LTC3880 powers-up, it checks the NVM for
a valid fault log. If a valid fault log exists in NVM, the
“ValidFaultLog”bitintheSTATUS_MFR_SPECIFICcom-
mand will be set and an ALERT event will be generated.
Also, fault logging will be blocked until the LTC3880 has
received a MFR_FAULT_LOG_CLEAR command before
fault logging will be re-enabled.
TheinformationisstoredinEEPROMintheeventofanyfault
that disables the controller on either channel. An external
GPIOn pulling low will not trigger a fault logging event.
BUS TIMEOUT FAILURE
TheLTC3880implementsatimeoutfeaturetoavoidhanging
theserialinterface.Thedatapackettimerbeginsatthefirst
START event before the device address write byte. Data
packet information must be completed within 25ms or
the LTC3880 will three-state the bus and ignore the given
data packet. Data packet information includes the device
address byte write, command byte, repeat start event
(if a read operation), device address byte read (if a read
operation), all data bytes and the PEC byte if applicable.
TheLTC3880allowslongerPMBustimeoutsforblockread
data packets. This timeout is proportional to the length
of the block read. The additional block read timeout ap-
plies primarily to the MFR_FAULT_LOG command. In no
circumstances will the timeout period be less than the
tTIMEOUT_SMB specification of 32ms (typical).
The user is encouraged to use as high a clock rate as
possible to maintain efficient data packet transfer between
all devices sharing the serial bus interface. The LTC3880
supports the full PMBus frequency range from 10kHz to
400kHz.
SIMILARITY BETWEEN PMBUS, SMBUS AND I2C
2-WIRE INTERFACE
The PMBus 2-wire interface is an incremental extension
of the SMBus. SMBus is built upon I2C with some minor
differences in timing, DC parameters and protocol. The
PMBus/SMBus protocols are more robust than simple I2C
bytecommandsbecausePMBus/SMBusprovidetime-outs
to prevent bus hangs and optional packet error checking
(PEC) to ensure data integrity. In general, a master device
that can be configured for I2C communication can be
used for PMBus communication with little or no change
to hardware or firmware. Repeat start (restart) is not
supported by all I2C controllers but is required for SMBus/
PMBus reads. If a general purpose I2C controller is used,
check that repeat start is supported.
For a description of the minor extensions and exceptions
PMBus makes to SMBus, refer to PMBus Specification
Part 1 Revision 1.1: Paragraph 5: Transport.
For a description of the differences between SMBus and
I2C, refer to System Management Bus (SMBus) Speci-
fication Version 2.0: Appendix B—Differences Between
SMBus and I2C.
PMBUS SERIAL DIGITAL INTERFACE
TheLTC3880communicateswithahost(master)usingthe
standardPMBusserialbusinterface.TheTimingDiagram,
Figure 5, shows the timing relationship of the signals on
the bus. The two bus lines, SDA and SCL, must be high
when the bus is not in use. External pull-up resistors or
current sources are required on these lines.
TheLTC3880isaslavedevice.Themastercancommunicate
with the LTC3880 using the following formats:
n
Master transmitter, slave receiver
n
Master receiver, slave transmitter
The following PMBus protocols are supported:
n
Write Byte, Write Word, Send Byte
n
Read Byte, Read Word, Block Read
n
Alert Response Address
Figures 7-16 illustrate the aforementioned PMBus proto-
cols. All transactions support PEC (parity error check) and
GCP(groupcommandprotocol).TheBlockReadsupports
255 bytes of returned data. For this reason, the PMBus
timeout may be extended when reading the fault log.
Figure 6 is a key to the protocol diagrams in this section.
PEC is optional.
相關(guān)PDF資料
PDF描述
LTC3880IUJ-1#PBF 0.1 A DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40
LTC3890EGN-1#PBF SWITCHING CONTROLLER, PDSO28
LTC3890IGN-1#TRPBF SWITCHING CONTROLLER, PDSO28
LTC3890IGN-1#PBF SWITCHING CONTROLLER, PDSO28
LTC3890MPUH#TRPBF DUAL SWITCHING CONTROLLER, 585 kHz SWITCHING FREQ-MAX, PQCC32
相關(guān)代理商/技術(shù)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(biāo)準(zhǔn)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(biāo)準(zhǔn)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(biāo)準(zhǔn)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(biāo)準(zhǔn)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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*