Linear Technology DC1329A - LTC4352 Low Voltage Ideal Diode Controller with Monitoring, LT4351 Replacement DC1329A DC1329A 数据表
产品代码
DC1329A
LTC4352
1
4352fa
Typical applicaTion
DescripTion
Low Voltage Ideal Diode
Controller with Monitoring
The LTC
®
4352 creates a near-ideal diode using an external
N-channel MOSFET. It replaces a high power Schottky diode
and the associated heat sink, saving power and board area.
The ideal diode function permits low loss power ORing
and supply holdup applications.
The LTC4352 regulates the forward voltage drop across
The LTC4352 regulates the forward voltage drop across
the MOSFET to ensure smooth current transfer in diode-
OR applications. A fast turn-on reduces the load voltage
droop during supply switch-over. If the input supply fails
or is shorted, a fast turn-off minimizes reverse currents.
The controller operates with supplies from 2.9V to 18V.
The controller operates with supplies from 2.9V to 18V.
For lower voltages, an external supply is needed at the
V
CC
pin. Power passage is disabled during undervoltage
or overvoltage conditions. The controller also features an
open MOSFET detect circuit that flags excessive voltage
drop across the pass transistor in the on state. A REV pin
enables reverse current, overriding the diode behavior
when desired.
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
2.9V to 18V Ideal Diode
FeaTures
applicaTions
n
Low Loss Replacement for Power Diode
n
Controls N-Channel MOSFET
n
0V to 18V Supply ORing or Holdup
n
0.5μs Turn-On and Turn-Off Time
n
Undervoltage and Overvoltage Protection
n
Open MOSFET Detect
n
Status and Fault Outputs
n
Hot Swappable
n
Reverse Current Enable Input
n
12-Pin MSOP and DFN (3mm
× 3mm) Packages
n
Redundant Power Supplies
n
Supply Holdup
n
Telecom Infrastructure
n
Computer Systems and Servers
V
CC
UV
OV
REV
OV
REV
LTC4352
STATUS
FAULT
MOSFET ON
STATUS
0.1µF*
TO LOAD
2.9V TO 18V
Si7336ADP
*OPTIONAL
FAULT
0.1µF
4352 TA01
CPO
V
IN
SOURCE
GATE
GND
OUT
Power Dissipation vs Load Current
LOAD CURRENT (A)
0
0
POWER DISSIPATION (W)
2.5
2.0
1.5
1.0
0.5
4.0
3.0
3.5
2
4
6
8
4352 TA01b
10
DIODE (SBG1025L)
MOSFET (Si7336ADP)
POWER
SAVED