Linear Technology Telecom, Datacom, Industrial Power Products User Manual
Linear Technology Corporation
1630 McCarthy Blvd.
Milpitas, CA 95035-7417
Tel: 408-432-1900
www.linear.com
WF08098KU
VOL 3
Telecom, Datacom and Industrial
Power Products
High Performance Analog ICs
02 C O N T E N T S
Contents
Page Description
Simplified DC/DC Conversion Block Diagrams
01 Isolated Block Diagram
02 Nonisolated Block Diagram
Hot Swap™/Ideal Diode Controllers
03 Overvoltage Protection Regulator and Inrush Current Limiter
04 – 05 Hot Swap Controllers
06–08 Ideal Diode Controllers
07 48V Fuse Monitor
Isolated DC/DC Conversion
09 – 10 Flyback Controllers
10 – 11 Forward Controllers/Smart Drivers
12 Demonstration Boards – Telecom/Datacom (18V to 75V)
13 Industrial Power Conversion (9V to 36V)
14 – 15 Push-Pull, Half- and Full-Bridge Controllers
Nonisolated DC/DC Conversion, Up to 100V Input
16 Buck and Boost High Voltage Controllers
17 Forward Controllers
®
18 Buck-Boost µModule
Regulators and Controllers
19 Monolithic Buck Regulators/Linear Regulators
20 MOSFET Drivers/Opto Drivers/Reference Voltage
PoE, Interface, System Monitoring and Control
21 Power over Ethernet Controllers
22 – 23 Rugged Serial Interface Transceivers
2
24 I
C and SMBus Buffers and Accelerators
25 Voltage Monitors and Supervisors
25 Pushbutton Controllers
26 Coulomb Counter/Battery Gas Gauge
2
27 High Voltage I
C Current and Voltage Monitor
28 Supply Trackers, Sequencers and Margining Controllers
Visit www.linear.com for our complete product offering.
Isolated DC/DC Conversion
B L O C K DI A G RA MI S O L AT ED DC / D C CO N V E R S IO N 01
Surge Suppression, Hot Swap
Controllers – High Voltage
page 3 – 4
V
IN
(4V - 100V)
Fuse Monitor
page 7
Flyback Controllers
page 9 – 10
Forward Controllers/
Smart Drivers
page 10 – 11
Push-Pull,
Half- and Full-Bridge
Controllers
page 14 – 15
MOSFET Drivers
ORing Diode Controllers –
High Voltage
page 6, 7
Secondary-Side
Forward Controllers
page 10 – 11
Secondary-Side
Smart Drivers
page 11
Optocoupler Driver
Reference Voltage
page 20
0.6V to 52V
Optional IBA for
Point-of-Load (POL)
(Eg, 28V, 12V, 5V or 3.3V)
ORing Diode Controllers –
Low Voltage
page 8
–
LDO Regulators
Monolithic
Synchronous Buck
Regulators
µModule
Regulators
High Current Step
Down Controllers
1
®
1
Hot Swap Controllers –
Low Voltage
page 5
1
–
1
Load
Load
Load
Load
Load
Load
page 20
Power over Ethernet
Controllers
page 21
RS485/RS422 and
RS232 Transceivers
page 22, 23
1
For descriptions of these products, visit www.linear.com.
Multiple Output
Regulators
PolyPhase® Step
Down Controllers
Bus Buffers and Accelerators
System Monitor and Control,
Digital Power
page 24 page 25 – 28
1
–
1
Load
Load
0202 N O N I S O L AT ED DC / D C CO N V ER S I O N
Nonisolated DC/DC Conversion
B L O C K D IA G R A M
Surge Suppression, Hot Swap
Controllers – High Voltage
page 3, 4
V
IN
(4V - 100V)
Fuse Monitor
page 7
Buck Controllers
page 16
Forward Controllers
page 17
Buck-Boost µModule
Regulators and Controllers
page 18
ORing Diode Controllers –
High Voltage
page 6, 7
0.6V to 52V
Optional IBA for
Point-of-Load (POL)
(Eg, 28V, 12V, 5V or 3.3V)
ORing Diode Controllers –
Low Voltage
page 8
LDO Regulators
Monolithic
Synchronous Buck
1
Regulators
µModule
1
Regulators
Hot Swap Controllers –
Low Voltage
page 5
1
Load
Load
Load
Load
Load
Monolithic Buck Regulators
page 19
High Voltage LDOs
page 19
RS485/RS422 and
RS232 Transceivers
page 22, 23
1
For descriptions of these products, visit www.linear.com.
High Current Step
Down Controllers
Multiple Output
Regulators
PolyPhase Step
Down Controllers
System Monitor and ControlBus Buffers and Accelerators
page 24 page 25 – 28
–
1
1
–
1
Load
Load
Load
LT4356 Surge Stopper: Overvoltage Protection Regulator and Inrush Current Limiter
In industrial applications, high voltage power supply spikes with durations ranging from a few microseconds to hundreds of milliseconds
are commonly encountered. The electronics in these systems must not only survive transient voltage spikes, but in many cases also
operate reliably throughout the event.
®
The LT
voltage circuitry from damaging spikes and surges found in industrial systems. The LT4356 offers complete front end protection, guards
against overloads and short circuits, and withstands input voltage reversal with a simple IC/MOSFET solution. The LT4356 also protects
against DC overvoltage and overcurrent, which ordinary surge suppressors cannot do.
Under normal conditions, the LT4356 drives the MOSFET fully on, so that input power passes through directly to the load, with very little
loss. If the input voltage rises above an adjustable output threshold, the LT4356 regulates the output at a safe level. The regulating action
eliminates the need to use high voltage rated components downstream. Instead, less costly components may be used, because the
LT4356 blocks high voltages from reaching them.
The LT4356 provides the ability to ride out transients for continued system operation. If the fault persists, an adjustable timer sets a time
limit to ensure the MOSFET stays within its operating limits before the load is disconnected and the system is shut down. The timer
capacitor is charged with a current proportional to the voltage drop, Vds. For an overcurrent fault, the timer charging current is increased.
This unique feature takes more advantage of the Safe Operating Area (SOA) of the MOSFET than would a fixed timer interval, allowing the
user to size the MOSFET appropriately for their surge requirements.
4356 Surge Stopper reduces the need for bulky filtering components (capacitors, inductors, TVS diodes, fuses) by isolating low
0303O V E R V O LTA GE PR O T EC T I O N RE G U L AT OR A N D I N RU S H CU R R E N T LI M I TE R
03034 8 V I S O LAT ED CO N V E R S I O N
LT4356 Features:
•
Stops High Voltage Surges
•
Adjustable Output Clamp Voltage
•
Overcurrent Protection
•
Wide Operation Range: 4V to 80V
•
Reverse Input Protection to –60V
•
Low 7μA Shutdown Current, LT4356-1/LT4356-3
•
Adjustable Fault Timer
•
Inrush Current Limiting
•
Controls N-Channel MOSFET
•
Shutdown Pin Withstands –60V to 100V
•
Fault Output Indication
•
Spare Amplifier for Level Detection Comparator or Linear Regulator Controller
•
Guaranteed Operation to 125ºC
•
Latchoff Operation (LT4356-3)
•
Automatic Retry (LT4356-1, LT4356-2)
•
Available in (4mm × 3mm) 12-Pin DFN, 10-Pin MSOP or 16-Pin SO Packages
4A, 12V Overvoltage Output Regulator
10mΩ
IRLR2908
LT4356DE
GND TMR
12V
V
383k
100k
IN
V
CC
SHDN
+
IN
A
OUT
V
OUT
10Ω
OUTGATESNS
0.1µF
Overvoltage Protection Regulates
Output at 27V During Transient
80V INPUT SURGE
102k
FB
4.99k
EN
FAULT
FLTUNDERVOLTAGE
V
CC
DC/DC
CONVERTER
SHDN
GND
20V/DIV
V
OUT
20V/DIV
V
IN
12V
27V CLAMP
12V
100ms/DIV
0204 H O T S W A P CO N T R OL L E R S – HI G H VO LTA GE
Hot Swap Controllers – High Voltage
Hot Swap controllers allow a circuit board to be safely inserted and removed from a live backplane. Using an N-channel pass MOSFET,
the board supply voltage can be ramped at an adjustable rate. Product features include independent adjustable inrush current and
overcurrent limits to minimize stresses on the pass MOSFET during start-up, input step, and output step short-circuit conditions. Newer
generation devices include an onboard ADC for board voltage and current monitoring, and an I
®
LTC
4260: Positive High Voltage Hot Swap Controller
2
C Compatible Monitoring
with I
Features:
•
Allows Safe Insertion into Live Backplane
•
8-Bit ADC Monitors Current and Voltage
•
I2C/SMBus Interface
•
Wide Operating Voltage Range: 8.5V to 80V
•
High Side Drive for External N-Channel MOSFET
•
Input Overvoltage/Undervoltage Protection
•
Optional Latchoff or Autoretry After Faults
•
Alerts Host After Faults
•
Foldback Current Limiting
3A, 48V Card Resident Application
48V
CONNECTOR 1
CONNECTOR 2
SDA
SCL
ALERT
GND
BACKPLANE PLUG-IN
*DIODES INC. SMBT70A
CARD
2
C interface for microcontroller interaction.
0.010Ω
FDB3632
49.9k
0.1μF
1.74k
UV
2.67k
*
OV
SDAO
SDAI
SCL
ALERT
ON
V
INTV
DD
SENSE
LTC4260
CC
10Ω
100k
6.8nF
GATE
TIMER GND
68nF
SOURCE
BD_PRST
ADIN
GPIO
V
OUT
+
FB
48V, 3A
C
L
43.5k
3.57k
24k
Part Number
Input Voltage
Range
Inrush
Control
High Voltage Hot Swap Controllers
LT4250 –18V to –80V Ramp ACL
LTC4252A-1/2 –15V to –100V
(Floating)
Active or
Ramp
LT4256-1/2/3 10.8V to 80V Active or
Ramp
LTC4260 8.5V to 80V Active or
Ramp
LTC4261 –12V to –100V
Ramp ACL
(Floating)
LT4356-1/2/3 4V to 80V Active or
Ramp
1
ACL = Active Current Limit
Overcurrent
Control UV OV
ACL
ACL
ACL
ACL
1
1
1
1
1
1
Yes Yes Yes LT1640A Pin-Compatible with Active Current
Yes Yes Yes Soft-Start Limits Inrush dI/dt Drain Accelerated
Yes Yes Yes LT4256-1/2 Pin-Compatible Upgrade to
Yes Yes Yes Yes Onboard 8-Bit ADC for Card Voltage and
Yes Yes Yes Delayed Onboard 10-Bit ADC for Card Voltage and
Fault
PWRGD/
Output
Reset Description Package
Limiting
Response. ±1% Undervoltage/Overvoltage
Threshold Accuracy for AdvancedTCA
Applications
LT1641. Open Circuit Detect Output. Latchoff/
Auto-Retry Operation
Current Monitoring, I2C Interface. Programmable
Latchoff or Auto-Retry
Current Monitoring, I2C Interface. Programmable
Latchoff or Auto-Retry
Yes Yes Surge Stopper: Overvoltage Protection
and Inrush Limiting. Spare Amplifier for
UV/OV Monitoring or Linear Regulator.
Latchoff/Auto-Retry Operation
SO-8
MSOP-8
MSOP-10
SO-8
SSOP-16
5x5 QFN-32
SSOP-24
SO-24
4x5 QFN-24
SSOP-28
4x3 DFN-12
MSOP-10
SO-16
Hot Swap Controllers – Low Voltage
Low voltage Hot Swap controllers include independent high side gate drivers to control single or dual voltages, as well as voltage power-up
and power-down ramp control, current foldback and inrush limiting. Our latest LTC4217 and LTC4218 Hot Swap products allow the
current limit threshold to be adjusted dynamically using an external pin. Additional features include a current monitor output that amplifies
the sense resistor voltage for ground referenced current sensing and a MOSFET temperature monitor output. Dedicated 12V versions
contain preset 12V-specific thresholds.
0305H O T S W A P CO N T R OL L E R S – LO W VO LTA GE
LTC4215: Hot Swap Controller with
2
C Compatible Monitoring
I
Features:
•
Allows Safe Insertion into Live Backplane
•
8-Bit ADC Monitors Current and Voltage
•
I2C/SMBus Interface
•
Wide Operating Voltage Range: 2.9V to 15V
•
dI/dt Controlled Soft-Start
•
High Side Drive for External N-Channel MOSFET
•
No External Gate Capacitor Required
•
Input Overvoltage/Undervoltage Protection
•
Optional Latchoff or Auto-Retry After Faults
•
Alerts Host After Faults
•
Inrush Current Limit with Foldback
•
Available in 24-Lead (4mm × 5mm) QFN and
16-Lead Narrow SSOP Packages
Part Number Channels
Input Voltage
Range
Inrush
Control
Low Voltage Hot Swap Controllers
LTC4210-1/2/3/4 1 2.7V to 16.5V Active or
Ramp
LTC4211 1 2.5V to 16.5V Active or
Ramp
LTC4215-1/2/3 1 2.9V to 16.5V Active or
Ramp
LTC4216 1 0V to 6V Active or
Ramp
LTC4217/-12 1 2.9V to 26.5V Active or
Ramp
LTC4218/-12 1 2.9V to 26.5V Active or
Ramp
LTC4222 2 2.9V to 29V Active or
Ramp
LTC4223-1/2 2 10V to 14V
2.7V to 6V
1
ACL = Active Current Limit
2
ECB = Electronic Circuit Breaker
Active or
Ramp
Overcurrent
Control
1
ACL
2
ECB
1
ACL
1
ACL
1
ACL
1
ACL
1
ACL
1
ACL
12V Application with 5A Circuit Breaker
0.005Ω
12V
34.8k
0.1µF
1.18k
Fault
Output
PLUG-IN
CARD
P6KE16A
CONNECTOR 1
3.4k
INTV
0.1µF
SDA
ALERT
GND
CONNECTOR 2
SCL
BACKPLANE
PWRGD/
Reset Description Package
UV VDDSENSE+SENSE–GATE
OV
SDAO
SDAI
SCL
ALERT
CC
INTV
CC
LTC4215UFD
Yes Active Current Limiting with a Circuit Breaker.
FDC653N
10Ω
TIMER SSON GND
68nF
+
SOURCE
ADIN
GPIO
SOT-23
Latchoff/Auto-Retry Operation
Yes Delayed No Gate Capacitor Required SO-8
MSOP-8
MSOP-10
Yes Yes I2C/SMBus Interface, Internal 8-bit ADC, dI/dt
Controlled Soft-Start
Delayed Ultralow Voltage Hot Swap Controller for 0V to 6V,
with a Separate Supply of 2.3V to 6V. Adjustable
SSOP-16
4x5 QFN-24
MSOP-10
4x3 DFN-12
Current Limit, Soft-Start and Response Time for
Overcurrent Protection
Yes Yes Small Footprint 2A Hot Swap Controller. Integrated
33mΩ MOSFET and R
. Adjustable, 5%
SENSE
TSSOP-10
5x3 DFN-16
Accurate Current Limit. 2% Accurate Undervoltage
and Overvoltage Protection. A Dedicated
12V Version (LTC4217-12) Contains Preset
12V Specific Thresholds
Yes Yes Adjustable, 5% Accurate (15mV) Current Limit. 2%
Accurate Undervoltage and Overvoltage Protection.
SSOP-16
5x3 DFN-16
A Dedicated 12V Version (LTC4218-12) Contains
Preset 12V Specific Thresholds
Yes I2C/SMBus Interface, Internal 10-bit ADC, dI/dt
Controlled Soft-Start. Latchoff/Auto-Retry Operation
Yes Yes Controls 12V and 3.3V Auxiliary Supplies. Integrated
0.3Ω AUX Switch. Adjustable Current Limit with
5x5 QFN-32
SSOP-36
5x5 QFN-32
SSOP-36
Circuit Breaker. Latchoff/Auto-Retry Operation
V
OUT
12V
C
L
30.1k
3.57k
FB
INTV
EN
CC
24k
0206 I D E A L D IO D E CO N T R O L L ER S – H I GH V OLTA GE
ORing Ideal Diode Controllers
Linear’s family of ideal diode controllers reduces forward voltage drop and power dissipation in ORing applications, eliminating the
heat sinks required by conventional rectifiers. They deliver smooth switchover without chatter and are free from oscillation in load sharing
applications, yet respond quickly when called upon to block DC current in the reverse state. Our controllers prevent backfeeding between
supplies and are easily configured to protect against reverse polarity inputs.
Ideal Diode Controllers – High Voltage
LTC4354: Negative Voltage Diode-OR Controller and Monitor
The LTC4354 is a negative voltage and the LTC4355 is a positive voltage
diode-OR controller that drive two external N-channel MOSFETs. Each
replaces two Schottky diodes and the associated heat sink, saving power
and space. The power dissipation is greatly reduced by using N-channel
MOSFETs as the pass transistors. Power sources can be easily ORed
together to increase total system power and reliability.
LTC4355: Positive High Voltage Dual Ideal Diode-OR with Input
Supply and Fuse Monitors
The LTC4355 can diode-OR two positive supplies or the return paths
of two negative supplies, such as in a –48V system. Power fault
detection indicates if the input supplies are not in regulation, the
inline fuses are blown, or the voltages across the MOSFETs are
greater than the fault threshold.
Features:
•
Replaces Power Schottky Diodes
•
Controls N-Channel MOSFETs
•
0.5µs Turn-Off Time Limits Peak Fault Current
•
Wide Operating Voltage Range: 9V to 80V
•
Smooth Switchover without Oscillation
•
No Reverse DC Current
•
Monitors VIN, Fuse and MOSFET Diode
•
Available in 14-Lead (4mm × 3mm) DFN,
Positive and Negative Supply Diode-ORing
RTNA
RTNB
16-Lead MS and SO Packages
IN1 GATE1 IN2
LTC4355
LTC4355
GND
GATE2 OUT
Power Dissipation vs Load Current
6
5
DIODE (MBR10100)
4
3
2
POWER DISSIPATION (W)
1
0
0
FET (FDB3632)
2 4 6 8
CURRENT (A)
POWER
SAVED
10
LOAD
VA=-48V
VB=-48V
V
CC
LTC4354
LTC4354
DA
DB
GA GB
V
SS
0307I D E A L D IO D E CO N T R O L L ER S / F U S E MO N I T OR
LTC4357: Positive High Voltage Ideal Diode Controller
The LTC4357 easily ORs power sources to increase total
system reliability. In diode-OR applications, the LTC4357 controls
48V, 10A Diode-OR
V
INA
48V
FDB3632
the forward voltage drop across the MOSFET to ensure smooth
current transfer from one path to the other without oscillation.
If the power source fails or is shorted, a fast turn-off minimizes
reverse current transients.
Features:
•
Reduces Power Dissipation by Replacing a Power Schottky Diode
with an N-Channel MOSFET
•
0.5µs Turn-Off Time Limits Peak Fault Current
•
Wide Operating Voltage Range: 9V to 80V
•
Smooth Switchover without Oscillation
•
No Reverse DC Current
•
Available in 6-Lead (2mm × 3mm) DFN and 8-Lead MSOP Packages
V
48V
IN OUT
INB
IN OUT
GATE
LTC4357
GND
FDB3632
GATE
LTC4357
GND
V
DD
V
DD
V
OUT
Part Number Input Supply Range Ideal Diode External FET Fault Monitoring Package
High Voltage Ideal Diode Controllers
LTC4354 –4.5V to –100V (Floating) Dual N-Channel Yes 3x2 DFN-8, SO-8
LTC4355 9V to 80V Dual N-Channel Yes 4x3 DFN-14, SO-16,
MSOP-16
LTC4357 9V to 80V Single N-Channel No 2x3 DFN-6, MSOP-8
TO LOAD
48V Fuse Monitor
The LTC1921 monitors two independent –48V supplies, including their fuses and drives up to three optoisolators to indicate status.
Requiring only three noncritical resistors and optoisolators, the LTC1921 replaces multiple voltage comparators, a voltage reference and
several precision resistors.
Dual Supply Fuse Monitor
–48V
RETURN
SUPPLY A
–48V
SUPPLY B
–48V
100k
100k
RTN
V
A
V
B
FUSE A
FUSE B
F1
F2
LTC1921
LTC1921
OUT F
OUT A
OUT B
FUSE GOOD
SUPPLY A GOOD
SUPPLY B GOOD
LOGIC
SUPPLY
SUPERVISOR
µP
LOGIC
COMMON
–48V LOAD
Part Number Input Voltage Range UV OV Package
Fuse Monitor
LTC1921 –10V to –80V Yes Yes MSOP-8, SO-8
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