LTC4225CGN-1#TRPBF Linear Technology, LTC4225CGN-1#TRPBF Datasheet

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LTC4225CGN-1#TRPBF

Manufacturer Part Number
LTC4225CGN-1#TRPBF
Description
Manufacturer
Linear Technology
Datasheet

Specifications of LTC4225CGN-1#TRPBF

Lead Free Status / RoHS Status
Compliant
FeaTures
applicaTions
Typical applicaTion
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
12V
12V
Power Path and Inrush Current Control for
Redundant Supplies
Low Loss Replacement for Power Schottky Diodes
Allows Safe Hot Swapping from a Live Backplane
2.9V to 18V Operating Range
Controls N-Channel MOSFETs
Limits Peak Fault Current in ≤1µs
0.5µs Turn-On and Reverse Turn-Off Time
Adjustable Current Limit with Circuit Breaker
Smooth Switchover without Oscillation
Adjustable Current Limit Fault Delay
Fault and Power Status Output
LTC4225-1: Latch Off After Fault
LTC4225-2: Automatic Retry After Fault
24-Lead 4mm × 5mm QFN and SSOP Packages
Redundant Power Supplies
Supply Holdup
MicroTCA Systems and Servers
Telecom Networks
Power Prioritizer
137k
20k
20k
137k
0.1µF
ON1
INTV
GND
ON2
CPO1
CPO2
CC
0.1µF
0.1µF
IN1
IN2
0.004
0.004
SENSE1 DGATE1
SENSE2 DGATE2
LTC4225
Si7336ADP
Si7336ADP
µTCA Application
Si7336ADP
Si7336ADP
HGATE1 OUT1
HGATE2 OUT2
PWRGD1
PWRGD2
FAULT1
FAULT2
TMR1
TMR2
EN2
EN1
47nF
DescripTion
47nF
The LTC
for two power rails by controlling external series connected
N-channel MOSFETs. MOSFETs acting as ideal diodes
replace two high power Schottky diodes and the associ-
ated 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 LTC4225 regulates the forward voltage drop across
the back-to-back 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 switch-over. If the input supply fails
or is shorted, a fast turn-off minimizes reverse-current
transients.
The LTC4225 allows independent on/off control, and reports
fault and power good status for the supply. The LTC4225-1
features a latch-off circuit breaker, while the LTC4225-2
provides automatic retry after a fault.
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
®
4225 offers ideal diode and Hot Swap™ functions
PLUG-IN
PLUG-IN
CARD 1
CARD 2
Dual Ideal Diode and
LTC4225-1/LTC4225-2
Hot Swap Controller
422512 TA01a
12V
7.6A
12V
7.6A
3.0
2.5
2.0
1.5
1.0
0.5
Power Dissipation vs Load Current
0
0
2
LOAD CURRENT (A)
(SBG1025L)
(Si7336ADP)
MOSFET
DIODE
4
POWER SAVED
6
422512 TA01
422512f
1
8

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LTC4225CGN-1#TRPBF Summary of contents

Page 1

... LTC4225-2 provides automatic retry after a fault. 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. ...

Page 2

LTC4225-1/LTC4225-2 absoluTe MaxiMuM raTings Supply Voltages IN1, IN2 .................................................. –0.3V to 24V INTV ..................................................... –0. Input Voltages ON1, ON2, EN1, EN2............................... –0.3V to 24V TMR1, TMR2 .........................–0.3V to INTV SENSE1, SENSE2 ................................... –0.3V to 24V Output Voltages ...

Page 3

... LTC4225CUFD-1#TRPBF LTC4225CUFD-2#PBF LTC4225CUFD-2#TRPBF LTC4225IUFD-1#PBF LTC4225IUFD-1#TRPBF LTC4225IUFD-2#PBF LTC4225IUFD-2#TRPBF LTC4225CGN-1#PBF LTC4225CGN-1#TRPBF LTC4225CGN-2#PBF LTC4225CGN-2#TRPBF LTC4225IGN-1#PBF LTC4225IGN-1#TRPBF LTC4225IGN-2#PBF LTC4225IGN-2#TRPBF Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. ...

Page 4

LTC4225-1/LTC4225-2 elecTrical characTerisTics temperature range, otherwise specifications are at T SYMBOL PARAMETER I External N-Channel Gate Pull-Up Current HGATE(UP) I External N-Channel Gate Pull-Down HGATE(DN) Current I External N-Channel Gate Fast HGATE(FPD) Pull-Down Current t Sense Voltage (INn – SENSEn) ...

Page 5

Typical perForMance characTerisTics IN Supply Current vs Voltage (V) IN 422512 G01 Diode Gate Voltage vs Current – 0.1V OUT ...

Page 6

LTC4225-1/LTC4225-2 Typical perForMance characTerisTics HGATE Pull-Up Current vs Temperature –11.0 –10.5 –10.0 –9.5 –9.0 –50 – TEMPERATURE (°C) 422512 G10 pin FuncTions CPO1, CPO2: Charge Pump Output. Connect a capacitor from CPO1 or CPO2 to the ...

Page 7

FuncTions INTV : Internal 5V Supply Decoupling Output. This pin CC must have a 0.1µF or larger capacitor. An external load of less than 500µA can be connected at this pin. ON1, ON2: On Control Input. A rising edge ...

Page 8

LTC4225-1/LTC4225-2 block DiagraM 65mV HGATE1 + + – A1 – 12V 10µA CHARGE 100µA PUMP 1 CPO1 GATE DRIVER 1 + DGATE1 GA1 + – – 12V 25mV OUT1 UV1 + IN1 – 1.9V CP1 – 1.235V HGATE1 ON + ...

Page 9

The LTC4225 functions as an ideal diode with inrush cur- rent limiting and overcurrent protection by controlling two external back-to-back N-channel MOSFETs ( supply path. This allows boards to be safely H inserted and removed ...

Page 10

LTC4225-1/LTC4225-2 applicaTions inForMaTion High availability systems often employ parallel-connected power supplies or battery feeds to achieve redundancy and enhance system reliability. Power ORing diodes are commonly used to connect these supplies at the point of load, but at the expense ...

Page 11

During a normal power-up, the ideal diode MOSFET turns on first. As soon as the internally generated supply, INTV rises above its 2.2V undervoltage lockout threshold, the internal charge pump is allowed to charge up the CPO pins. ...

Page 12

LTC4225-1/LTC4225-2 applicaTions inForMaTion Board Presence Detect with high when the EN pin goes low, indicating a board presence, the LTC4225 initiates a 100ms timing cycle for contact debounce. Upon board insertion, any bounces on the EN ...

Page 13

Active Current Loop Stability The active current loop on the HGATE pin is compensated by the parasitic gate capacitance of the external N-channel MOSFET. No further compensation components are nor- mally required. In the case when a MOSFET ...

Page 14

LTC4225-1/LTC4225-2 applicaTions inForMaTion TMR 1V/DIV FAULT 10V/DIV HGATE 5V/DIV I LOAD 20A/DIV 50ms/DIV Figure 6. Auto-Retry Sequence After a Fault Supply Undervoltage Monitor The ON pin functions as a turn-on control and an input supply monitor. A resistive divider connected ...

Page 15

MOSFET Selection The LTC4225 drives N-channel MOSFETs to conduct the load current. The important features of the MOSFETs are on-resistance the maximum drain-source volt- DS(ON) age and the threshold voltage. DSS The gate drive ...

Page 16

LTC4225-1/LTC4225-2 applicaTions inForMaTion Next, verify that the thermal ratings of the selected MOSFET, Si7336ADP , are not exceeded during power- output short. Assuming the MOSFET dissipates power due to inrush current charging the load capacitor, C energy dissipated ...

Page 17

Connect the IN and OUT pin traces as close as possible to the MOSFETs’ terminals. Keep the traces to the MOSFETs wide and short to minimize resistive losses. The PCB traces associated with the power path through the ...

Page 18

LTC4225-1/LTC4225-2 applicaTions inForMaTion Power Prioritizer Figure 8 shows an application where either of two supplies is passed to the output on the basis of priority, rather than simply allowing the highest voltage to prevail. The 5V pri- mary supply (INPUT ...

Page 19

V IN1 12V BULK SUPPLY BYPASS CAPACITOR C CP1 0.1µF CPO1 IN1 ON1 PWREN1 INTV CC C1 0.1µF GND PWREN2 ON2 CPO2 IN2 C CP2 0.1µF V IN2 12V BULK SUPPLY BYPASS CAPACITOR Figure 9. An Application with ...

Page 20

LTC4225-1/LTC4225-2 applicaTions inForMaTion V IN1 12V Z1 SMAJ13A R2 137k 0.1µF 20k 20k 0.1µF R4 137k V IN2 12V Z2 SMAJ13A BACKPLANE CARD CONNECTOR CONNECTOR Figure 11. Card Resident Application with the Output Diode-ORed ...

Page 21

POWER MODULE #1 12V IN1 IN2 12V 12V IN1 IN2 12V POWER MODULE #2 12V IN1 IN2 12V 12V IN1 IN2 12V *ADDITIONAL DETAILS OMITTED FOR CLARITY Figure 12. 12V Distribution in µTCA Redundant Power Subsystem SENSE1 DGATE1 ...

Page 22

LTC4225-1/LTC4225-2 package DescripTion 4.50 ± 0.05 3.10 ± 0.05 2.65 ± 0.05 2.00 REF 0.25 ±0.05 0.50 BSC RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED PIN 1 TOP MARK (NOTE 6) 5.00 ...

Page 23

... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 24

... Operates from 9V to 26.5V, On-Chip N-Channel, TSSOP-16 or DFN-14 www.linear.com ● 100µF OUT1 FAULT1 PWRGD1 TMR1 TMR2 0.1µF 0.1µF PWRGD2 FAULT2 OUT2 M 422512 TA02 Compatible Monitoring, SSOP-16 or QFN- Compatible Monitoring, SSOP-36 or QFN-32 LT 0211 • PRINTED IN USA  LINEAR TECHNOLOGY CORPORA TION 2011 422512f ...

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