Linear Technology LTC4228-1 Demoboard, Dual Ideal Diode and Hot Swap Controller, Latchoff After Fault DC1899A-A DC1899A-A 数据表
产品代码
DC1899A-A
LTC4228-1/LTC4228-2
1
422812f
CPO1
ON1
137k
12V
12V
ON2
INTV
CC
GND
0.1µF
0.1µF
0.1µF
47nF
47nF
IN1
SENSE1
–
SENSE1
+
DGATE1
Si7336ADP
LTC4228
0.004Ω
Si7336ADP
Si7336ADP
0.004Ω
Si7336ADP
HGATE1 OUT1
CPO2
IN2
SENSE2
–
SENSE2
+
DGATE2
HGATE2 OUT2
STATUS1
FAULT1
PWRGD1
EN1
EN2
PWRGD2
FAULT2
STATUS2
20k
20k
137k
12V
7.6A
PLUG-IN
CARD 1
PLUG-IN
CARD 2
BACKPLANE
422812 TA01a
12V
7.6A
TMR1
TMR2
I
IN2
2A/DIV
I
IN1
2A/DIV
IN2
1V/DIV
IN1
1V/DIV
200ms/DIV
422512 TA01b
Typical applicaTion
FeaTures
DescripTion
Dual Ideal Diode and
Hot Swap Controller
The LTC
®
4228 offers ideal diode and Hot Swap™ functions
for two power rails by controlling two external N-channel
MOSFETs in each rail. MOSFETs acting as ideal diodes re-
place two high power Schottky diodes and the associated
heat sinks, saving power and board area. Hot Swap control
MOSFETs allow boards 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 LTC4228 regulates the forward voltage drop across
The LTC4228 regulates the forward voltage drop across
the external MOSFETs and sense resistor 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 switch-over. If the
input supply fails or is shorted, a fast turn-off minimizes
reverse-current transients.
The LTC4228 allows independent on/off control, and reports
The LTC4228 allows independent on/off control, and reports
fault and power good status for the supply. The LTC4228
improves on the LTC4225 by recovering more quickly from
input brownouts to preserve the output voltage.
µTCA Application
applicaTions
n
Power Path and Inrush Current Control for
Redundant Supplies
n
Low Loss Replacement for Power Schottky Diodes
n
Protects Output Voltage from Input Brownouts
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
Adjustable Current Limit with Circuit Breaker
n
Adjustable Current Limit Fault Delay
n
Smooth Switchover without Oscillation
n
0.5µs Ideal Diode Turn-On and Turn-Off Time
n
Status, Fault and Power Good Outputs
n
LTC4228-1: Latch Off After Fault
n
LTC4228-2: Automatic Retry After Fault
n
28-Lead 4mm
× 5mm QFN and SSOP Packages
n
Redundant Power Supplies
n
MicroTCA Systems and Servers
n
Telecom Networks
n
Power Prioritizer
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.
Smooth Supply Switchover