LTC4224IMS-1#PBF Linear Technology, LTC4224IMS-1#PBF Datasheet

IC CTLR HOT SWAP DUAL LV 10MSOP

LTC4224IMS-1#PBF

Manufacturer Part Number
LTC4224IMS-1#PBF
Description
IC CTLR HOT SWAP DUAL LV 10MSOP
Manufacturer
Linear Technology
Type
Hot-Swap Controllerr
Datasheet

Specifications of LTC4224IMS-1#PBF

Applications
General Purpose
Internal Switch(s)
No
Voltage - Supply
1 V ~ 6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC4224IMS-1#PBFLTC4224IMS-1
Manufacturer:
LT
Quantity:
10 000
Company:
Part Number:
LTC4224IMS-1#PBF
Manufacturer:
LT
Quantity:
70
FEATURES
APPLICATIONS
n
n
n
n
n
n
n
n
n
n
n
n
n
n
TYPICAL APPLICATION
3.3V
5V
Allows Safe Board Insertion and Removal from a
Live Backplane
Controls Load Voltages from 1V to 6V
No Gate Components Required
Adjustable Current Limit with Circuit Breaker
Limits Peak Fault Current in ≤1μs
No External Timing Capacitor Required
Adjustable Supply Voltage Power-Up Rate
Gate Drive for External N-channel MOSFET
LTC4224-1: Latchoff After Fault
LTC4224-2: Automatic Retry After Fault
10-Lead MSOP and 3mm × 2mm DFN Packages
Optical Networking
Low Voltage Hot Swap
Electronic Circuit Breakers
FAULT
V
CC1
0.015Ω
SENSE1
LTC4224
V
CC2
0.010Ω
LTC4224
SENSE2 GATE1 GATE2
FDS6911
GND
ON1
ON2
CONNECTOR PLUG-IN
CARD
422412 TA01a
5V
1A
3.3V
2A
Voltage Hot Swap Controller
GND
DESCRIPTION
The LTC
allows a board to be safely inserted and removed from a
live backplane. It controls two supplies with external N-
channel MOSFETs and operates with one supply as low
as 1V provided the other supply is 2.7V or greater. The
LTC4224 can ramp up the supplies in any order and at
adjustable ramp rates. To minimize the number of external
components and PCB area, the gate capacitor is optional,
all timing delays are generated internally, and the ON pins
have integrated pull-up currents.
Protection against overcurrent faults is provided by a fast-
acting current limit and timed circuit breakers. A FAULT pin
signals overcurrent faults. The LTC4224-1 remains off after
a fault, while the LTC4224-2 automatically tries to apply
power again after a four second cool-down period.
L, LT, LTC and LTM 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.
2A/DIV
2A/DIV
5V/DIV
5V/DIV
V
V
OUT1
OUT2
I
I
IN1
IN2
®
4224 Dual Low Voltage Hot Swap™ controller
LTC4224-1/LTC4224-2
Compact Dual Low
Normal Power-Up Waveform
0.5ms/DIV
C
LOAD
= 150μF
422412 TA01b
422412fa
1

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LTC4224IMS-1#PBF Summary of contents

Page 1

... The LTC4224-1 remains off after a fault, while the LTC4224-2 automatically tries to apply power again after a four second cool-down period. L, LT, LTC and LTM 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

... LTC4224IDDB-2#TRPBF LTC4224CMS-1#PBF LTC4224CMS-1#TRPBF LTC4224CMS-2#PBF LTC4224CMS-2#TRPBF LTC4224IMS-1#PBF LTC4224IMS-1#TRPBF LTC4224IMS-2#PBF LTC4224IMS-2#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. Consult LTC Marketing for information on non-standard lead based fi nish parts. ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range 25° 5V CC1 SYMBOL PARAMETER Supplies V V Supply Range Supply Current Undervoltage Lockout CC(UVL Supply Range CCLO CCLO ...

Page 4

LTC4224-1/LTC4224-2 TYPICAL PERFORMANCE CHARACTERISTICS Specifi cations are T = 25° 5V CC1 1.5 1.4 1.3 1.2 1.1 1.0 2.5 3 3.5 4 4.5 5 5.5 V (V) CC 422412 G01 Gate ...

Page 5

PIN FUNCTIONS SENSE1, SENSE2 (Pins 1,10): Current Sense Input. Con- nect this pin to an external sense resistor. The current limit circuit controls GATEn to limit the voltage between V and SENSEn to 25mV. An Electronic Circuit Breaker (ECB) is ...

Page 6

LTC4224-1/LTC4224-2 OPERATION The LTC4224 is designed to control power on a live back- plane, allowing boards to be safely inserted and removed. It controls two supplies ( with operating voltages CC1 CC2 between 1V and 6V via ...

Page 7

APPLICATIONS INFORMATION V Selection CC The LTC4224 is powered from the higher of its two supply pins, V and V .This allows the part to control a sup- CC1 CC2 ply voltage as low as 1V, while the other supply ...

Page 8

LTC4224-1/LTC4224-2 APPLICATIONS INFORMATION If the voltage across the sense resistor R1 becomes too high, the inrush current is limited by the internal current limit circuitry. Turn-Off Sequence The MOSFETs can be turned off by the conditions sum- marized in Table ...

Page 9

APPLICATIONS INFORMATION ON1 2V/DIV FAULT 5V/DIV I OUT1 1A/DIV GATE1 5V/DIV 5ms/DIV Figure 6. Start-Up with Short at Output time, a 5ms start-up blanking delay begins during which the circuit breaker is not allowed to latchoff the MOSFET. If the ...

Page 10

LTC4224-1/LTC4224-2 APPLICATIONS INFORMATION If there is signifi cant supply lead inductance, a severe output short may collapse the input to ground before the LTC4224 can bring the current under control. In this case, the undervoltage lockout activates after an 8μs ...

Page 11

APPLICATIONS INFORMATION V CC2 1 SENSE2 CC2 3 GATE2 GND LTC4224 VIAS TO GND PLANE Figure 11. Recommended Layout for Input Supply Transient Protection Network Also, bypass locally with a ...

Page 12

LTC4224-1/LTC4224-2 APPLICATIONS INFORMATION Next, assume that there is no load current at start-up, and calculate the inrush current required to charge the load capacitor. As there is no gate capacitor, the supplies start-up in current limit. Compute the time, t ...

Page 13

TYPICAL APPLICATION 5V 3.3V PWRFLT PWREN GND BACKPLANE CARD CONNECTOR CONNECTOR 5V 5V and 3.3V Card Resident Application R1 0.004Ω R SNUB1 10Ω SNUB1 100nF 0.004Ω R SNUB2 10Ω 10k C SNUB2 V SENSE1 V CC1 ...

Page 14

LTC4224-1/LTC4224-2 PACKAGE DESCRIPTION 0.64 ±0.05 (2 SIDES) 0.70 ±0.05 2.55 ±0.05 1.15 ±0.05 PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 2.39 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING CONFORMS TO VERSION (WECD-1) IN JEDEC PACKAGE ...

Page 15

... LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 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 16

... Operates from 1V to 13.5V, Multifunction Current Control Controls 12V and 3.3V for AMC and μTCA www.linear.com ● APS 2A 3. GND CONNECTOR PLUG-IN CARD 422412 TA04 ™ Electronic Circuit Breaker SENSE LT 1108 REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2008 422412fa ...

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