Swap Controller. LTC4236 Datasheet

LTC4236 Controller. Datasheet pdf. Equivalent


Part LTC4236
Description Dual Ideal Diode-OR and Single Hot Swap Controller
Feature Features nn Ideal Diode-OR and Inrush Current Control for Redundant Supplies nn Low Loss Replacement.
Manufacture Linear
Datasheet
Download LTC4236 Datasheet


Features nn Ideal Diode-OR and Inrush Current Control for Re LTC4236 Datasheet
Recommendation Recommendation Datasheet LTC4236 Datasheet




LTC4236
Features
nn Ideal Diode-OR and Inrush Current Control for
Redundant Supplies
nn Low Loss Replacement for Power Schottky Diodes
nn Enables Safe Board Insertion into a Live Backplane
nn 2.9V to 18V Operating Range
nn Current Monitor Output
nn Controls N-Channel MOSFETs
nn Limits Peak Fault Current in ≤ 1µs
nn Adjustable Current Limit with Foldback
nn Adjustable Start-Up and Current Limit Fault Delay
nn 0.5µs Ideal Diode Turn-On and Turn-Off Time
nn Smooth Switchover without Oscillation
nn Fault, Power Good and Diode Status Outputs
nn LTC4236-1: Latch Off After Fault
nn LTC4236-2: Automatic Retry After Fault
nn 28-Pin 4mm x 5mm QFN Package
Applications
nn Redundant Power Supplies
nn High Availability Systems and Servers
nn Telecom and Network Infrastructure
LTC4236
Dual Ideal Diode-OR and
Single Hot Swap Controller
with Current Monitor
Description
The LTC®4236 offers ideal diode-OR and Hot Swap func-
tions 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 foldback current limit and electronic circuit breaker.
The LTC4236 regulates the forward voltage drop across
the ideal diode MOSFETs to ensure smooth current transfer
from one supply to the other without oscillation. The ideal
diode MOSFETs 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.
A current sense amplifier translates the voltage across the
sense resistor to a ground referenced signal. The LTC4236
provides adjustable start-up delay, turn-on/-off control,
and reports fault and power good status for the supply.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 7920013, 8022679.
Typical Application
12V
0.1µF
12V
Ideal Diode-OR with Hot Swap Application
SiR158DP
0.1µF
SiR158DP
0.1µF
0.003Ω SiR158DP
13.7k CPO1 IN1 DGATE1 CPO2 D2SRC IN2 DGATE2 REG SENSE+ CS+ SENSEHGATE OUT
ON
FB
2k
EN
INTVCC
GND
0.1µF
LTC4236
D2OFF
DTMR
0.1µF
FAULT
PWRGD
DSTAT1
DSTAT2
FTMR
IMON
0.1µF
+
12V
IN1
7A 1V/DIV
CLOAD
IN2
1V/DIV
15k
IIN1
2A/DIV
2k
IIN2
2A/DIV
ADC
4236 TA01a
For more information www.linear.com/LTC4236
Smooth Supply Switchover
IN2
IN1
200ms/DIV
4236 TA01b
4236f
1



LTC4236
LTC4236
Absolute Maximum Ratings
(Notes 1, 2)
Supply Voltages
IN1, IN2................................................... –0.3V to 24V
INTVCC...................................................... –0.3V to 7V
REG............................SENSE+ – 5V to SENSE+ + 0.3V
Input Voltages
ON, D2OFF, EN ....................................... –0.3V to 24V
FTMR, DTMR..........................–0.3V to INTVCC + 0.3V
FB............................................................. –0.3V to 7V
SENSE+, SENSE, CS+, D2SRC............... –0.3V to 24V
Output Voltages
IMON........................................................ –0.3V to 7V
FAULT, PWRGD, DSTAT1, DSTAT2............ –0.3V to 24V
CPO1, CPO2 (Notes 3, 4)........................ –0.3V to 35V
DGATE1, DGATE2 (Notes 3, 4)................ –0.3V to 35V
HGATE (Note 5)...................................... –0.3V to 35V
OUT........................................................ –0.3V to 24V
Average Currents
FAULT, PWRGD, DSTAT1, DSTAT2..........................5mA
INTVCC................................................................10mA
Operating Ambient Temperature Range
LTC4236C................................................. 0°C to 70°C
LTC4236I..............................................–40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
TOP VIEW
28 27 26 25 24 23
SENSE– 1
22 FAULT
SENSE+ 2
21 DSTAT1
CS+ 3
20 DSTAT2
IN1 4
INTVCC 5
GND 6
29
19 ON
18 D2OFF
17 NC
IN2 7
16 NC
D2SRC 8
15 REG
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W (NOTE 6)
EXPOSED PAD (PIN 29) PCB GND CONNECTION OPTIONAL
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4236CUFD-1#PBF
LTC4236CUFD-1#TRPBF 42361
28-Lead (4mm x 5mm) Plastic QFN
0°C to 70°C
LTC4236CUFD-2#PBF
LTC4236CUFD-2#TRPBF 42362
28-Lead (4mm x 5mm) Plastic QFN
0°C to 70°C
LTC4236IUFD-1#PBF
LTC4236IUFD-1#TRPBF 42361
28-Lead (4mm x 5mm) Plastic QFN
–40°C to 85°C
LTC4236IUFD-2#PBF
LTC4236IUFD-2#TRPBF 42362
28-Lead (4mm x 5mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
4236f
2
For more information www.linear.com/LTC4236







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