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Linear Technology Electronic Components Datasheet

LTC4228-2 Datasheet

Dual Ideal Diode and Hot Swap Controller

No Preview Available !

Features
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
Applications
n Redundant Power Supplies
n MicroTCA Systems and Servers
n Telecom Networks
n Power Prioritizer
LTC4228-1/LTC4228-2
Dual Ideal Diode and
Hot Swap Controller
Description
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 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
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.
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.
Typical Application
µTCA Application
Si7336ADP
0.004Ω
Si7336ADP
12V
0.1µF
PLUG-IN
CARD 1
12V
7.6A
CPO1
137k
20k
0.1µF
ON1
INTVCC
GND
20k
ON2
137k
CPO2
IN1 DGATE1 SENSE1+ SENSE1HGATE1 OUT1
STATUS1
FAULT1
PWRGD1
EN1
LTC4228
TMR1
TMR2
EN2
PWRGD2
FAULT2
STATUS2
IN2 DGATE2 SENSE2+ SENSE2HGATE2 OUT2
47nF
47nF
PLUG-IN
CARD 2
0.1µF
12V
Si7336ADP
0.004Ω
Si7336ADP
BACKPLANE
12V
7.6A
422812 TA01a
Smooth Supply Switchover
IN1
1V/DIV
IN2
1V/DIV
IIN1
2A/DIV
IIN2
2A/DIV
200ms/DIV
422512 TA01b
422812f
1


Linear Technology Electronic Components Datasheet

LTC4228-2 Datasheet

Dual Ideal Diode and Hot Swap Controller

No Preview Available !

LTC4228-1/LTC4228-2
Absolute Maximum Ratings (Notes 1, 2)
Supply Voltages
IN1, IN2................................................... –0.3V to 24V
INTVCC...................................................... –0.3V to 7V
Input Voltages
ON1, ON2, EN1, EN2............................... –0.3V to 24V
STMENRS1E, 1T+M, SRE2N..S...E..2.+....................................–..0....3..V...t.o...I.N–T0V.3CVC
+ 0.3V
to 24V
SENSE1, SENSE2................................ –0.3V to 24V
Output Voltages
FAULT1, FAULT2, PWRGD1, PWRGD2...... –0.3V to 24V
STATUS1, STATUS2................................. –0.3V to 24V
CPO1, CPO2 (Note 3).............................. –0.3V to 35V
DGATE1, DGATE2 (Note 3)...................... –0.3V to 35V
HGATE1, HGATE2 (Note 4)...................... –0.3V to 35V
OUT1, OUT2............................................ –0.3V to 24V
Average Currents
FAULT1, FAULT2, PWRGD1, PWRGD2....................5mA
STATUS1, STATUS2...............................................5mA
INTVCC..................................................................1mA
Operating Temperature Range
LTC4228C................................................. 0°C to 70°C
LTC4228I..............................................–40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
GN Package....................................................... 300°C
Pin Configuration
TOP VIEW
28 27 26 25 24 23
SENSE11
22 FAULT1
SENSE1+ 2
21 ON1
IN1 3
20 EN1
INTVCC 4
GND 5
29 19 TMR1
18 TMR2
IN2 6
SENSE2+ 7
SENSE28
17 EN2
16 ON2
15 FAULT2
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W (NOTE 5)
EXPOSED PAD (PIN 29) PCB GND CONNECTION OPTIONAL
TOP VIEW
STATUS1 1
CPO1 2
DGATE1
SENSE1
SENSE1+
3
4
5
IN1 6
INTVCC 7
GND 8
IN2
SENSE2+
SENSE2
9
10
11
DGATE2 12
CPO2 13
STATUS2 14
28 HGATE1
27 OUT1
26 PWRGD1
25 FAULT1
24 ON1
23 EN1
22 TMR1
21 TMR2
20 EN2
19 ON2
18 FAULT2
17 PWRGD2
16 OUT2
15 HGATE2
GN PACKAGE
28-LEAD PLASTIC SSOP NARROW
TJMAX = 125°C, θJA = 80°C/W
422812f
2


Part Number LTC4228-2
Description Dual Ideal Diode and Hot Swap Controller
Maker Linear Technology
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LTC4228-2 Datasheet PDF






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