參數(shù)資料
型號(hào)： LTC1479CG
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 電源管理
英文描述： Low-Power LinCMOS(TM) Dual Comparator 10-CFP -55 to 125
中文描述： 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO36
封裝： 0.209 INCH, PLASTIC, SSOP-36
文件頁(yè)數(shù)： 13/24頁(yè)
文件大?。?/td> 466K
代理商： LTC1479CG
13
LTC1479
APPLICATIO
S I
FOR
ATIO
U
In the “3-diode” mode, only the first half of each power
path switch pair, i.e., SW A, SW C and SW E, is turned on;
and the second half, i.e., SW B, SW D and SW F, is turned
off. These three switch pairs now act simply as three
diodes connected to the three main input power sources
as illustrated in Figure 4. The power ‘diode’ with the
highest input voltage passes current through to the input
of the DC/DC converter to ensure that the power manage-
ment
μ
P is powered at start-up or under abnormal oper-
ating conditions. (An undervoltage lockout circuit defeats
this mode when the V
+
pin drops below approximately
4.5V).
W
U
U
the Power Management
μ
P Interface section for additional
information on when to invoke “3-diode” mode.)
COMPONENT SELECTION
N-Channel Switches
The LTC1479 adaptive inrush limiting circuitry permits the
use of a wide range of logic-level N-channel MOSFET
switches. A number of dual low R
DS(ON)
N-channel switches
in 8-lead surface mount packages are available that are
well suited for LTC1479 applications.
The maximum allowable drain source voltage, V
DS(MAX)
,
of the three main switch pairs, SW A/B, SW C/D and SW
E/F, must be high enough to withstand the maximum DC
supply voltage. If the DC supply is in the 20V to 28V range,
use 30V MOSFET switches. If the DC supply is in the 10V
to 18V range, and is well regulated, then use 20V MOSFET
switches.
As a general rule, select the switch with the lowest R
DS(ON)
at the maximum allowable V
DS
. This will minimize the heat
dissipated in the switches while increasing the overall
system efficiency. Higher switch resistances can be toler-
ated in some systems with lower current requirements,
but care should be taken to ensure that the power dissi-
pated in the switches is never allowed to rise above the
manufacturer’s recommended levels.
The maximum allowable drain-source voltage, V
DS(MAX)
,
of the two charger switch pairs, SW G and SW H, need only
Figure 4. LTC1479 PowerPath Switches in “3-Diode” Mode
BAT1
BAT2
SW A
SW C
SW E
+
HIGH
EFFICIENCY
DC/DC
SWITCHING
REGULATOR
5V
3.3V
12V
C
IN
DCIN
1479 F04
SW B
SW F
SW D
R
SENSE
POWER
MANAGEMENT
μ
P
LTC1479
PowerPath CONTROLLER
ON
OFF
ON
OFF
ON
OFF
“Cold Start” Initial Condition
The LTC1479 is designed to start in the “3- diode” mode
when all five logic inputs are low—when no power is
available (including the backup system). A 100k resistor
from the 3DM input to ground ensures that this input is low
during a “cold start.” This will cause the main PowerPath
switches to pass the highest voltage available to the input
of the DC/DC converter. Normal operation will then
resume after a good power source is identified.
Recovery from Uncertain Power Conditions
The “3-diode” mode can also be asserted (by applying an
active low to the 3DM input) when abnormal conditions
exist in the system, i.e., when all power sources are
deemed not “good” or are depleted, or the management
system
μ
P is being reset or not functioning properly. (See
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1479CG#PBF 功能描述:IC CTRLR DUAL BATT SYS 36-SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測(cè)計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 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:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱(chēng):497-10526-2
LTC1479CG#TR 功能描述:IC CTRLR POWERPATH BATT 36SSOP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 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:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LTC1479CG#TRPBF 功能描述:IC CTRLR DUAL BATT SYS 36-SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 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:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LTC1479IG 功能描述:IC CNTRLR FORDUAL BATTSYS 36SSOP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 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:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LTC1479IG#PBF 功能描述:IC CNTRLR FORDUAL BATTSYS 36SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測(cè)計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 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:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱(chēng):497-10526-2
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