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LT4351IMS Datasheet

  • LT4351IMS

  • MOSFET Diode-OR Controller

  • 20頁(yè)

  • LINER

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LT4351
MOSFET Diode-OR Controller
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
Low Loss Replacement for ORing Diode in Multiple
Sourced Power Supplies
External N-Channel MOSFETs for High Current
Capability
Internal Boost Regulator Supply for MOSFET
Gate Drive
Wide Input Range: 1.2V to 18V
Fast Switching MOSFET Gate Control
Input Under and Overvoltage Detection
STATUS and FAULT Outputs for Monitoring
Internal MOSFET Gate Clamp
Available in a 10-pin MSOP
The LT4351 creates a near-ideal diode using external
single or back-to-back N-channel MOSFETs. This ideal
diode function permits low loss ORing of multiple power
sources. Power sources can easily be ORed together to
increase total system power and reliability with minimal
effect on supply voltage or efficiency. Disparate power
supplies can be efficiently ORed together.
The IC monitors the input supply with respect to the load
and turns on the MOSFET(s) when the input supply is
higher. If the MOSFET鈥檚 R
DS(ON)
is sufficiently small, the
LT4351 will regulate the voltage across the MOSFET(s) to
15mV. A STATUS pin indicates the MOSFET on state.
An internal boost regulator generates the MOSFET gate
drive voltage. Low operating voltage allows for OR鈥檌ng of
supplies as low as 1.2V.
The LT4351 will disable power passage during undervolt-
age or overvoltage conditions. These voltages are set by
resistive dividers on the UV and OV pins. The undervoltage
threshold has user programmable hysteresis. Overvolt-
age detection is filtered to reduce false triggering.
The LT4351 is available in a 10-pin MSOP.
APPLICATIO S
s
s
s
s
Paralleled Power Supplies
Uninterrupted Supplies
High Availability Systems
N + 1 Redundant Power Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Dual 5V Redundant Supply
Si4862DY
5V
10碌F
POWER
SUPPLY
1
1碌F
MBR0530
SW
4.7碌H
UV
STATUS
FAULT
OV
1.47k
1%
GND
STATUS
FAULT
GND
OV
1.47k
1%
4351 TA01
Si4862DY
5V COMMON
10碌F
POWER
SUPPLY
2
GATE
V
IN
V
DD
1碌F
MBR0530
SW
UV
4.7碌H
5V
C
LOAD
R
LOAD
V
IN
V
DD
GATE
OUT
OUT
24.9k
1%
232鈩?/div>
1%
LT4351
LT4351
U
24.9k
1%
232鈩?/div>
1%
sn4351 4351fs
U
U
1

LT4351IMS 產(chǎn)品屬性

  • LT4351

  • 50

  • 集成電路 (IC)

  • PMIC - O 圈控制器

  • -

  • 并行/冗余電源

  • N 溝道

  • 1

  • 無(wú)

  • -

  • 600ns

  • 1.2 V ~ 18 V

  • 1.4mA

  • -40°C ~ 85°C

  • 表面貼裝

  • 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）

  • 10-MSOP

  • 管件

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