Linear Technology LTC4227CUFD-2 Demo Board: Dual Ideal Diode & Single Hot Swap Controller with Fault Auto-Retry and 100ms On Delay Linear DC1625A-B 数据表
产品代码
DC1625A-B
LTC4227
1
422712fa
Typical applicaTion
FeaTures
DescripTion
Dual Ideal Diode and
Single Hot Swap Controller
The
functions for two power rails by controlling external N-
channel MOSFETs. MOSFETs acting as ideal diodes replace
two high power Schottky diodes and the associated heat
sinks, saving power and board area. A Hot Swap control
MOSFET allows a board to be safely inserted and removed
from a live backplane by limiting inrush current. The supply
output is also protected against short-circuit faults with a
fast acting current limit and internal timed circuit breaker.
The LTC4227 regulates the forward voltage drop across
The LTC4227 regulates the forward voltage drop across
the MOSFETs to ensure smooth current transfer from one
supply to the other without oscillation. The ideal diodes
turn on quickly to reduce the load voltage droop during
supply switchover. If the input supply fails or is shorted,
a fast turn-off minimizes reverse-current transients.
The LTC4227 allows turn-on/off control, and reports fault
The LTC4227 allows turn-on/off control, and reports fault
and power good status for the supply.
PART
OVERCURRENT FAULT
START-UP DELAY
LTC4227-1
LATCH OFF
100ms
LTC4227-2
RETRY
100ms
LTC4227-3
LATCH OFF
1.6ms
LTC4227-4
RETRY
1.6ms
Diode-OR with Hot Swap Application
applicaTions
n
Power Path and Inrush Current Control for
Redundant Supplies
n
Low Loss Replacement for Power Schottky Diodes
n
Allows Safe Hot Swapping from a Live Backplane
n
2.9V to 18V Operating Range
n
Controls N-Channel MOSFETs
n
Limits Peak Fault Current in ≤1µs
n
0.5µs Ideal Diode Turn-On and Reverse Turn-Off Time
n
Adjustable Current Limit with Circuit Breaker
n
Smooth Switchover without Oscillation
n
Adjustable Current Limit Fault Delay
n
Fault and Power Status Output
n
20-Lead 4mm × 5mm QFN and 16-Lead SSOP Packages
n
Redundant Power Supplies and Supply Holdup
n
Computer Systems and Servers
n
Telecom Networks
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
BACKPLANE
CONNECTOR
12V
12V
CARD
CONNECTOR
CPO1
D2ON
ON
PWRGD
FAULT
137k
100µF
12V
7.6A
20k
INTV
CC
GND
IN1 DGATE1
DGATE2
LTC4227
4227 TA01a
SiR462DP
Si7336ADP
0.006Ω
HGATE OUT
SENSE
+
SENSE
–
CPO2
0.1µF
IN2
+
0.1µF
SiR462DP
EN
0.1µF
0.1µF
TMR
Smooth Supply Switchover
200ns/DIV
I
IN2
2A/DIV
I
IN1
2A/DIV
IN2
1V/DIV
IN1
1V/DIV
4227 TA01b