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LT4351

Description
MOSFET Diode-OR Controller
File Size267KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LT4351 Overview

MOSFET Diode-OR Controller

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’s 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’ing 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
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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
10µF
POWER
SUPPLY
1
1µF
MBR0530
SW
4.7µH
UV
STATUS
FAULT
OV
1.47k
1%
GND
STATUS
FAULT
GND
OV
1.47k
1%
4351 TA01
Si4862DY
5V COMMON
10µF
POWER
SUPPLY
2
GATE
V
IN
V
DD
1µF
MBR0530
SW
UV
4.7µH
5V
C
LOAD
R
LOAD
V
IN
V
DD
GATE
OUT
OUT
24.9k
1%
232Ω
1%
LT4351
LT4351
U
24.9k
1%
232Ω
1%
sn4351 4351fs
U
U
1

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LT4351 LT4351CMS LT4351IMS
Description MOSFET Diode-OR Controller MOSFET Diode-OR Controller MOSFET Diode-OR Controller
Brand Name - Linear Technology Linear Technology
Is it Rohs certified? - incompatible incompatible
Parts packaging code - MSOP MSOP
package instruction - TSSOP, PLASTIC, MSOP-10
Contacts - 10 10
Manufacturer packaging code - MS MS
Reach Compliance Code - _compli _compli
ECCN code - EAR99 EAR99
high side driver - YES YES
Interface integrated circuit type - BUFFER OR INVERTER BASED MOSFET DRIVER BUFFER OR INVERTER BASED MOSFET DRIVER
JESD-30 code - S-PDSO-G10 S-PDSO-G10
JESD-609 code - e0 e0
length - 3 mm 3 mm
Humidity sensitivity level - 1 1
Number of functions - 1 1
Number of terminals - 10 10
Maximum operating temperature - 70 °C 85 °C
Nominal output peak current - 0.67 A 0.67 A
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - TSSOP TSSOP
Package shape - SQUARE SQUARE
Package form - SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius) - 235 235
Certification status - Not Qualified Not Qualified
Maximum seat height - 1.1 mm 1.1 mm
Maximum supply voltage - 18 V 18 V
Minimum supply voltage - 1.2 V 1.2 V
Nominal supply voltage - 5 V 5 V
Supply voltage 1-max - 30 V 30 V
Supply voltage1-Nom - 16.1 V 16.1 V
surface mount - YES YES
Temperature level - COMMERCIAL INDUSTRIAL
Terminal surface - Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form - GULL WING GULL WING
Terminal pitch - 0.5 mm 0.5 mm
Terminal location - DUAL DUAL
Maximum time at peak reflow temperature - 20 20
width - 3 mm 3 mm
Base Number Matches - 1 1
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