Datasheet Linear Technology LTC1644

Manufacturer	Linear Technology
Series	LTC1644

CompactPCI Bus Hot Swap Controller

Datasheets

PDF, 458 Kb, File uploaded: Oct 25, 2017

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Packaging

	LTC1644CGN#PBF	LTC1644CGN#TRPBF	LTC1644IGN#PBF	LTC1644IGN#TRPBF
N	1	2	3	4
Package	SSOP-20 Package Outline Drawing	SSOP-20 Package Outline Drawing	SSOP-20 Package Outline Drawing	SSOP-20 Package Outline Drawing
Package Code	GN	GN	GN	GN
Package Index	05-08-1641 (GN20)	05-08-1641 (GN20)	05-08-1641 (GN20)	05-08-1641 (GN20)
Pin Count	20	20	20	20

Parametrics

Parameters / Models	LTC1644CGN#PBF	LTC1644CGN#TRPBF	LTC1644IGN#PBF	LTC1644IGN#TRPBF
Active Limiting	yes	yes	yes	yes
Circuit Breaker Accuracy, %	27	27	27	27
Circuit Breaker Threshold	55mV	55mV	55mV	55mV
Circuit Breakers	4	4	4	4
Demo Boards	DC461A	DC461A	DC461A	DC461A
Design Tools	LTspice Model	LTspice Model	LTspice Model	LTspice Model
Export Control	no	no	no	no
Fault Output	yes	yes	yes	yes
Foldback	yes	yes	yes	yes
In-Rush Current	Active	Active	Active	Active
Isupply, mA	3	3	3	3
Operating Temperature Range, °C	0 to 70	0 to 70	-40 to 85	-40 to 85
Power Good Output	yes	yes	yes	yes
Reset Output	no	no	no	no
Sequencing	no	no	no	no
Tracking	yes	yes	yes	yes
Vin Range	3.3, 5, В±12V	3.3, 5, В±12V	3.3, 5, В±12V	3.3, 5, В±12V

Eco Plan

	LTC1644CGN#PBF	LTC1644CGN#TRPBF	LTC1644IGN#PBF	LTC1644IGN#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant

Design Notes

Download
Design Guidelines for CompactPCI Hot Swap Control Applications Using the LTC1644 &mdash Design Solutions 12
PDF, 132 Kb, File published: May 1, 2003
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Design Solutions 12
May 2003
Design Guidelines for CompactPCI Hot Swap Control
Applications Using the LTC1644
by Andy Gardner
Introduction Long and Medium Power Pin Connections The LTCВ®1644 is designed for CompactPCITM Hot SwapTM
control applications requiring вЂ“12V, 5V, 3.3V and 12V
supplies (see Figure 1). The LTC1644 also precharges the
bus I/O pins during hot insertion and extraction, feeds
back the status of the back-end supply voltages with its
PWRGD output, and intercepts the PCI_RST# signal onchip using the RESETIN and RESETOUT pins. There are
several important considerations in circuit design and
component selection for CompactPCI Hot Swap control
applications using the LTC1644. CompactPCI connectors have both long and medium
length GND, 5V, 3.3V and VI/O power pins as well as
medium length вЂ“12V and 12V power pins. In general,
medium length power pins are used for вЂњBack End Power
PlanesвЂќ where the connector pins are isolated from the
load by the LTC1644. The long connector pins may be
used to provide вЂњEarly PowerвЂќ to loads that require power
immediately upon hot insertion without the benefit of BACKPLANE
CONNECTOR C8
0.01ВµF …

Articles

Download
CompactPCI Hot Swap Controllers with Bus Precharge, On-Chip Intercept of PCI Reset Signal and Much More &mdash LT Journal
PDF, 175 Kb, File published: Dec 1, 2001
Extract from the document
DESIGN FEATURES CompactPCI Hot Swap Controllers
with Bus Precharge, On-Chip Intercept
of PCI Reset Signal and Much More
by Andrew Gardner
Introduction
When a circuit board is inserted into
a вЂњhotвЂќ (powered) backplane, its supply bypass capacitors can draw large
currents from the backplane power
bus as they charge. These currents
can cause glitches on the backplane
supply voltage, resetting other boards
in the system, and can even damage
edge connectors. The LTC1644 and
LTC1646 Hot Swapв„ў controllers
safely limit these charging currents
during board insertion into a hot backplane. They also offer several features
specifically tailored for CompactPCIв„ў
(CPCI) Hot Swap applications: R2
0.007в„¦
1% 5VIN MED 5V
LONG 5V R1
0.005в„¦, 1% 3VIN MED 3.3V
LONG 3.3V LONG V(I/O) V(I/O) MED вЂ“12V SHORT BD_SEL# CompactPCI CONNECTOR D1 R4 …

Model Line

Series: LTC1644 (4)

LTC1644CGN#PBF LTC1644CGN#TRPBF LTC1644IGN#PBF LTC1644IGN#TRPBF

Manufacturer's Classification

Monitor, Control and Protection > Hot Swap Controllers > PCI Hot Swap Controllers | Low Voltage Hot Swap Controllers

Slices

Microcontrollers