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LTC4417_15

产品描述Prioritized PowerPat Controller
文件大小421KB,共32页
制造商Linear ( ADI )
官网地址http://www.analog.com/cn/index.html
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LTC4417_15概述

Prioritized PowerPat Controller

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FeaTures
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LTC4417
Prioritized PowerPath™
Controller
DescripTion
The LTC
®
4417 connects one of three valid power supplies
to a common output based on priority. Priority is defined
by pin assignment, with V1 assigned the highest priority
and V3 the lowest priority. A power supply is defined as
valid when its voltage has been within its overvoltage (OV)
and undervoltage (UV) window continuously for at least
256ms. If the highest priority valid input falls out of the
OV/UV window, the channel is immediately disconnected
and the next highest priority valid input is connected to the
common output. Two or more LTC4417s can be cascaded
to provide switchover between more than three inputs.
The LTC4417 incorporates fast non-overlap switching
circuitry to prevent both reverse and cross conduction
while minimizing output droop. The gate driver includes
a 6V clamp to protect external MOSFETs. A controlled
output ramp feature minimizes start-up inrush current.
Open drain
VALID
outputs indicate the input supplies have
been within their OV/UV window for 256ms.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath, ThinSOT and Hot Swap are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
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applicaTions
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Selects Highest Priority Supply from Three Inputs
Blocks Reverse and Cross Conduction Currents
Wide Operating Voltage Range: 2.5V to 36V
–42V Protection Against Reverse Battery
Connection
Fast Switchover Minimizes Output Voltage Droop
Low 28µA Operating Current
<1µA Current Draw from Supplies Less than V
OUT
1.5% Input Overvoltage/Undervoltage Protection
Adjustable Overvoltage/Undervoltage Hysteresis
P-Channel MOSFET Gate Protection Clamp
Cascadable for Additional Input Supplies
24-Lead Narrow SSOP and 4mm × 4mm QFN
Packages
Industrial Handheld Instruments
High Availability Systems
Battery Backup Systems
Servers and Computer Peripherals
Typical applicaTion
V1: 12V
WALL ADAPTER
V2: 14.8V Li-Ion
MAIN/SWAPPABLE
V3: 12V SLA
BACKUP
IRF7324
2A
OUTPUT
IRF7324
Priority Switching from 12V V1 to 14.8V V2
IRF7324
V2
V1
806k
UV1
39.2k
OV1
60.4k
V2
1.05M
UV2
31.6k
OV2
68.1k
V3
698k
UV3
16.9k
OV3
49.9k
GND
EN
SHDN
HYS
CAS
4417 TA01a
14.8V
12V
V
OUT
VS1 G1
VS2 G2
VS3 G3
V
OUT
1M
VALID1
VALID2
VALID3
1M
1M
V1
2V/DIV
V1 UV FAULT
V3 = 0V, I
L
= 2A
C
L
= 120µF
50ms/DIV
4417 TA01b
LTC4417
4417f
1
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