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參數(shù)資料
| 型號(hào)： | LTC1473 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual Power Management Switch Driver(雙電源管理開關(guān)驅(qū)動(dòng)器) |
| 中文描述： | 雙電源管理開關(guān)驅(qū)動(dòng)器（雙電源管理開關(guān)驅(qū)動(dòng)器） |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大?。?/td> | 199K |
| 代理商： | LTC1473 |
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9
LTC1473
APPLICATIO
S I
FOR
ATIO
U
block current flow in either direction when both switches
are turned off.
The back-to-back topology also allows for independent
control of each half of the switch pair which facilitates
bidirectional inrush current limiting and the so-called
“2-diode mode” described in the following section.
W
U
U
The 2-Diode Mode
Under normal operating conditions, both halves of each
switch pair are turned on and off simultaneously. For
example, when the input power source is switched from
BAT1 to BAT2 in Figure 4, both gates of switch pair SW
A1/B1 are normally turned off and both gates of switch pair
SW A2/B2 are turned on. The back-to-back body diodes in
switch pair, SW A1/B1, block current flow in or out of the
BAT1 input connector.
In the “2-diode mode,” only the first half of each power
path switch pair, i.e., SW A1 and SW A2, are turned on; and
the second half, i.e., SW B1 and SW B2 are turned off.
These two switch pairs now act simply as two diodes
connected to the two main input power sources as illus-
trated in Figure 4. The power path diode with the highest
input voltage passes current through to the output load
(i.e. input of the DC/DC converter) to ensure that the power
management
μ
P is powered even under start-up or abnor-
mal operating conditions. (An undervoltage lockout circuit
defeats this mode when the V
+
pin drops below approxi-
mately 3.2V. The supply to V
+
comes from the main power
sources, DCIN, BAT1 and BAT2 through three external
diodes as shown in Figure 1.)
The 2-diode mode is asserted by applying an active low to
the DIODE input.
COMPONENT SELECTION
N-Channel Switches
The LTC1473 adaptive inrush current 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 LTC1473 applications.
The maximum allowable drain-source voltage, V
DS(MAX)
,
of the two switch pairs, SW A1/B1 and SW A2/B2 must be
high enough to withstand the maximum DC supply volt-
age. 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 20V MOSFET switches
will suffice.
Figure 4. LTC1473 PowerPath Switches in 2-Diode Mode
BAT1
DCIN
BAT2
SW A2
SW B2
ON
OFF
R
SENSE
HIGH
EFFICIENCY
DC/DC
SWITCHING
REGULATOR
5V
3.3V
1473 F04
12V
POWER
MANAGEMENT
μ
P
+
C
IN
SW A1
SW B1
ON
OFF
LTC1473
OUTPUT LOAD
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| LTC1473CGN | 功能描述:IC SWITCH DVR PWRPATH DUAL16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - O 圈控制器 系列:PowerPath™ 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:電池備份，工業(yè)/汽車，大電流開關(guān) FET 型:- 輸出數(shù):5 內(nèi)部開關(guān):是 延遲時(shí)間 - 開啟:100ns 延遲時(shí)間 - 關(guān)閉:- 電源電壓:3 V ~ 5.5 V 電流 - 電源:250µA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC N 包裝:帶卷 (TR) |
| LTC1473CGN#PBF | 功能描述:IC SWITCH DVR PWRPATH DUAL16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - O 圈控制器 系列:PowerPath™ 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:電池備份，工業(yè)/汽車，大電流開關(guān) FET 型:- 輸出數(shù):5 內(nèi)部開關(guān):是 延遲時(shí)間 - 開啟:100ns 延遲時(shí)間 - 關(guān)閉:- 電源電壓:3 V ~ 5.5 V 電流 - 電源:250µA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC N 包裝:帶卷 (TR) |
| LTC1473CGN#TR | 功能描述:IC DRIVER SWITCH DUAL 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - O 圈控制器 系列:PowerPath™ 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:電池備份，工業(yè)/汽車，大電流開關(guān) FET 型:- 輸出數(shù):5 內(nèi)部開關(guān):是 延遲時(shí)間 - 開啟:100ns 延遲時(shí)間 - 關(guān)閉:- 電源電壓:3 V ~ 5.5 V 電流 - 電源:250µA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC N 包裝:帶卷 (TR) |
| LTC1473CGN#TRPBF | 功能描述:IC SWITCH DVR PWRPATH DUAL16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - O 圈控制器 系列:PowerPath™ 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:電池備份，工業(yè)/汽車，大電流開關(guān) FET 型:- 輸出數(shù):5 內(nèi)部開關(guān):是 延遲時(shí)間 - 開啟:100ns 延遲時(shí)間 - 關(guān)閉:- 電源電壓:3 V ~ 5.5 V 電流 - 電源:250µA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC N 包裝:帶卷 (TR) |
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