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)： 22/112頁(yè)
文件大?。?/td> 2182K
代理商： LTC3880EUJ-1#PBF
LTC3880/LTC3880-1
17
3880fa
OPERATION
2.5V, 3.3V and 5V. If VIN is below 6V, the INTVCC and VIN
pins must be tied together. The controller configuration
is initialized by an internal threshold based UVLO where
VIN must be approximately 4V and the 5V, 3.3V and 2.5V
linear regulators must be within approximately 20% of
the regulated values. The LTC3880-1 does not have an
internal 5V linear regulators. The EXTVCC pin is driven by
an external regulator to improve efficiency of the circuit
and minimize power on the LTC3880. The EXTVCC pin
must exceed approximately 4V before the internal UVLO
is exceeded. To minimize application power, the EXTVCC
pin can be supplied by a switching regulator.
During initialization, the external configuration resistors
are identified and/or contents of the NVM are read into
the controller’s commands and all PWM outputs are in
high impedance (Hi-Z) mode. The RUNn and GPIOn pins
are held low. The LTC3880 will use the contents of Tables
12 to 15 to determine the resistor defined parameters.
See the Resistor Configuration section for more detail.
The resistor configuration pins only control some of the
preset values of the controller. The remaining values are
programmed in NVM either at the factory or by the user.
If the configuration resistors are not inserted or if the
ignore RCONFIG bit is asserted (bit 6 of the MFR_
CONFIG_ALL_LTC3880 configuration command), the
LTC3880 will use only the contents of NVM to determine
the DC/DC characteristics. The ASEL value read at power-
up or reset is always respected unless the pin is open.
The ASEL will use the MSB from NVM and the LSB from
the detected threshold. See the Applications Information
section for more detail.
After the part has initialized, an additional comparator
monitors VIN. The VIN_ON threshold must be exceeded
before the output power sequencing can begin. After VIN
is initially applied, the part will typically require 130ms to
initialize and begin the TON_DELAY timer. The readback of
voltages and currents may require an additional 120ms.
SOFT-START
The part must enter the run state prior to soft-start.
The run pins are released by the LTC3880 after the part
initializes and VIN is greater than the VIN_ON threshold. If
multiple LTC3880s are used in an application, they all hold
their respective run pins low until all devices initialize and
VIN exceeds the VIN_ON threshold for every device. The
SHARE_CLK pin assures all the devices connected to the
signal usethe same timebase. The SHARE_CLK pin isheld
low until the part has initialized after VIN is applied. The
LTC3880canbesettoturnoff(orremainoff)ifSHARE_CLK
is low (set bit 2 of MFR_CHAN_CONFIG_LTC3880 to a 1).
This allows the user to assure synchronization across
numerous LTC ICs even if the RUN pins can not be con-
nected together due to board constraints. In general, if
the user cares about synchronization between chips it is
best to connect all the respective RUN pins together and
to connect all the respective SHARE_CLK pins together.
This assures all chips begin sequencing at the same time
and use the same time base.
After the RUN pin releases and prior to entering a constant
output voltage regulation state, the LTC3880 performs a
monotonic initial ramp or “soft-start”. Soft-start is per-
formedbyactivelyregulatingtheloadvoltagewhiledigitally
ramping the target voltage from 0V to the commanded
voltageset-point.OncetheLTC3880iscommandedtoturn
on, (after power up and initialization) the controller waits
for the user specified turn-on delay (TON_DELAY) prior
to initiating this output voltage ramp. The rise time of the
voltage ramp can be programmed using the TON_RISE
command to minimize inrush currents associated with the
start-up voltage ramp. The soft-start feature is disabled
by setting the value of TON_RISE to any value less than
0.25ms. The LTC3880 PWM always uses discontinuous
mode during the TON_RISE operation. In discontinuous
mode, the bottom gate is turned off as soon as reverse
current is detected in the inductor. This will allow the
regulator to start up into a pre-biased load. When the
TON_MAX_FAULT_LIMIT is reached, the part transi-
tions to continuous mode or burst, if so programmed. If
TON_MAX_FAULT_LIMIT is set to zero, there is no time
limit and the part transitions to the desired conduction
mode after TON_RISE completes and VOUT has exceeded
the VOUT_UV_FAULT_LIMIT and IOUT_OC is not pres-
ent. Setting TON_MAX_FAULT_LIMIT to a value of 0 is
not recommended. This described method of start-up
sequencing is time based.
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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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

*
*
*