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| 型号： | LTC1473IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH DVR PWRPATH DUAL16SSOP |
| 标准包装： | 2,500 |
| 系列： | PowerPath™ |
| 应用： | 手持/移动设备 |
| FET 型： | N 沟道 |
| 输出数： | 2 |
| 内部开关： | 无 |
| 延迟时间 - 开启： | 22µs |
| 延迟时间 - 关闭： | 1µs |
| 电源电压： | 4.75 V ~ 30 V |
| 电流 - 电源： | 100µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
LTC1473
APPLICATIO N S I N FOR M ATIO N
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.
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.
DCIN
SW B1
OUTPUT LOAD
SW A1
R SENSE
BAT1
ON
OFF
SW B2
+
C IN
HIGH
EFFICIENCY
DC/DC
SWITCHING
12V
5V
BAT2
SW A2
ON
LTC1473
OFF
REGULATOR
POWER
MANAGEMENT
μ P
3.3V
1473 F04
Figure 4. LTC1473 PowerPath Switches in 2-Diode Mode
9
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| LTC1473LCGN | 功能描述:IC SWITCH DVR PWRPATH DUAL16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:PowerPath™ 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
| LTC1473LCGN#PBF | 功能描述:IC SWITCH DVR PWRPATH DUAL16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:PowerPath™ 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
| LTC1473LCGN#TR | 功能描述:IC DRIVER SWITCH DUAL LV 16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:PowerPath™ 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
| LTC1473LCGN#TRPBF | 功能描述:IC SWITCH DVR PWRPATH DUAL16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:PowerPath™ 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
| LTC1474CMS8 | 功能描述:IC REG BUCK ADJ 0.75A 8MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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