Linear Technology LTC4417CUF Demoboard : Prioritized PowerPath Controller DC1717A DC1717A 数据表

LTC4417

1

4417f

Prioritized PowerPath™  

Controller

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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  Fast Switchover Minimizes Output Voltage Droop

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  Low 28µA Operating Current

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 <1µA Current Draw from Supplies Less than V

OUT

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 1.5% Input Overvoltage/Undervoltage Protection

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  Adjustable Overvoltage/Undervoltage Hysteresis

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  P-Channel MOSFET Gate Protection Clamp

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  Cascadable for Additional Input Supplies

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  24-Lead Narrow SSOP and 4mm × 4mm QFN 

Packages

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  Industrial Handheld Instruments

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  High Availability Systems

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  Battery Backup Systems

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  Servers and Computer Peripherals

IRF7324

IRF7324

IRF7324

VS1

V1

V

OUT

VALID1
VALID2
VALID3

V1: 12V 

WALL ADAPTER

2A

OUTPUT

V2: 14.8V Li-Ion

MAIN/SWAPPABLE

V3: 12V SLA

BACKUP

UV1

OV1

806k

1M

1M

1M

39.2k

60.4k

V2

UV2

OV2

1.05M

31.6k

68.1k

V3

EN

SHDN

HYS

CAS

UV3

OV3

4417 TA01a

698k

16.9k

49.9k

G1

VS2

VS3

G2

GND

LTC4417

G3

V2

V1

V3 = 0V, I

L

 = 2A

C

L

 = 120µF

50ms/DIV

4417 TA01b

2V/DIV

V

OUT

V1 UV FAULT

14.8V

12V

14.8V