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 Contents
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
12Demonstration Boards – Telecom/Datacom (18V to 75V)
13Industrial Power Conversion (9V to 36V)
14 – 15 Push-Pull, Halfand Full-Bridge Controllers
Nonisolated DC/DC Conversion, Up to 100V Input
16Buck and Boost High Voltage Controllers
17Forward Controllers
18Buck-Boost µModule® Regulators and Controllers
19Monolithic Buck Regulators/Linear Regulators
20MOSFET Drivers/Opto Drivers/Reference Voltage
PoE, Interface, System Monitoring and Control
21Power over Ethernet Controllers
22 – 23 Rugged Serial Interface Transceivers
24I2C and SMBus Buffers and Accelerators
25Voltage Monitors and Supervisors
25Pushbutton Controllers
26Coulomb Counter/Battery Gas Gauge
27High Voltage I2C Current and Voltage Monitor
28Supply Trackers, Sequencers and Margining Controllers
Visit www.linear.com for our complete product offering.
Isolated dc/dc conversion |
block diagram |
01 |
Isolated DC/DC Conversion
Surge Suppression, Hot Swap |
ORing Diode Controllers – |
Controllers – High Voltage |
High Voltage |
page 3 – 4 |
page 6, 7 |
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ORing Diode Controllers – |
Hot Swap Controllers – |
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Low Voltage |
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Low Voltage |
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page 8 |
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page 5 |
VIN |
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(4V - 100V) |
0.6V to 52V |
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Load |
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Fuse Monitor |
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page 7 |
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Optional IBA for |
– |
LDO Regulators1 |
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Point-of-Load (POL) |
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Load |
Flyback Controllers |
(Eg, 28V, 12V, 5V or 3.3V) |
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page 9 – 10 |
Secondary-Side |
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Monolithic |
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Forward Controllers |
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Synchronous Buck |
Load |
Forward Controllers/ |
page 10 – 11 |
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Regulators1 |
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Smart Drivers |
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page 10 – 11 |
Secondary-Side |
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Smart Drivers |
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µModule® |
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Load |
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Push-Pull, |
page 11 |
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Regulators1 |
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Halfand Full-Bridge |
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Controllers |
Optocoupler Driver |
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page 14 – 15 |
Reference Voltage |
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High Current Step – |
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page 20 |
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Load |
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Down Controllers1 |
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MOSFET Drivers |
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page 20 |
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Multiple Output |
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Load |
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Regulators1 |
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Power over Ethernet |
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Controllers |
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page 21 |
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PolyPhase® Step – |
Load |
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Down Controllers1 |
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RS485/RS422 and |
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RS232 Transceivers |
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page 22, 23 |
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Bus Buffers and Accelerators |
System Monitor and Control, |
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Digital Power |
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page 24 |
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page 25 – 28 |
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1 For descriptions of these products, visit www.linear.com.
02 |
nonIsolated Dc/Dc Conversion |
block diagram |
Nonisolated DC/DC Conversion
Surge Suppression, Hot Swap |
ORing Diode Controllers – |
Controllers – High Voltage |
High Voltage |
page 3, 4 |
page 6, 7 |
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ORing Diode Controllers – |
Hot Swap Controllers – |
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VIN |
Low Voltage |
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Low Voltage |
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(4V - 100V) |
page 8 |
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page 5 |
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0.6V to 52V |
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Load |
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Fuse Monitor |
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page 7 |
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Optional IBA for |
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Buck Controllers |
Point-of-Load (POL) |
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(Eg, 28V, 12V, 5V or 3.3V) |
LDO Regulators1 |
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Load |
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page 16 |
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Forward Controllers |
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Monolithic |
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Synchronous Buck |
Load |
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page 17 |
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Regulators1 |
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Buck-Boost µModule |
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Regulators and Controllers |
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µModule |
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Load |
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page 18 |
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Regulators1 |
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Monolithic Buck Regulators |
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High Current Step – |
Load |
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page 19 |
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Down Controllers1 |
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High Voltage LDOs |
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Multiple Output |
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Load |
page 19 |
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Regulators1 |
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RS485/RS422 and |
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RS232 Transceivers |
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PolyPhase Step– |
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Load |
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page 22, 23 |
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Down Controllers1 |
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Bus Buffers and Accelerators |
System Monitor and Control |
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page 24 |
page 25 – 28 |
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1 For descriptions of these products, visit www.linear.com.
Overvoltage protection regulator and inrush current limiter |
03 |
48V Isolated Conversion |
03 |
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®4356 Surge Stopper reduces the need for bulky filtering components (capacitors, inductors, TVS diodes, fuses) by isolating low 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.
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 |
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VIN |
10mΩ |
IRLR2908 |
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VOUT |
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12V |
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10Ω |
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102k |
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383k |
VCC |
SNS |
GATE |
OUT |
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FB |
VCC |
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SHDN |
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4.99k |
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IN+ |
LT4356DE |
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DC/DC |
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CONVERTER |
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100k |
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EN |
SHDN |
GND |
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UNDERVOLTAGE |
AOUT |
GND |
TMR |
FLT |
FAULT |
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0.1µF |
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Overvoltage Protection Regulates
Output at 27V During Transient
80V INPUT SURGE
VIN
20V/DIV
12V
27V CLAMP
VOUT
20V/DIV
12V
100ms/DIV
042 HOT SWAP CONTROLLERS – HIGH VOLTAGE
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 I2C interface for microcontroller interaction.
LTC®4260: Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring
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
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0.010Ω |
FDB3632 |
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VOUT |
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48V |
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+ |
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48V, 3A |
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CL |
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49.9k |
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43.5k |
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10Ω |
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100k |
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0.1μF |
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6.8nF |
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3.57k |
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2 |
1 |
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1.74k |
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CONNECTOR |
CONNECTOR |
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* |
2.67k |
UV |
VDD |
SENSE GATE |
SOURCE |
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OV |
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FB |
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SDAO |
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LTC4260 |
BD_PRST |
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SDA |
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SDAI |
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SCL |
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SCL |
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ADIN |
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24k |
ALERT |
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ALERT |
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ON |
INTVCC |
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TIMER |
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GND |
GPIO |
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GND |
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68nF |
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BACKPLANE PLUG-IN CARD
*DIODES INC. SMBT70A
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Input Voltage |
Inrush |
Overcurrent |
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Part Number |
Range |
Control |
Control |
UV |
OV |
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High Voltage Hot Swap Controllers
Fault |
PWRGD/ |
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Output |
Reset |
Description |
Package |
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LT4250 |
–18V to –80V |
Ramp |
ACL1 |
Yes |
Yes |
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Yes |
LT1640A Pin-Compatible with Active Current |
SO-8 |
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Limiting |
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LTC4252A-1/2 |
–15V to –100V |
Active or |
ACL1 |
Yes |
Yes |
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Yes |
Soft-Start Limits Inrush dI/dt Drain Accelerated |
MSOP-8 |
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(Floating) |
Ramp |
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Response. ±1% Undervoltage/Overvoltage |
MSOP-10 |
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Threshold Accuracy for AdvancedTCA |
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Applications |
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LT4256-1/2/3 |
10.8V to 80V |
Active or |
ACL1 |
Yes |
Yes |
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LT4256-1/2 Pin-Compatible Upgrade to |
SO-8 |
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Ramp |
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LT1641. Open Circuit Detect Output. Latchoff/ |
SSOP-16 |
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Auto-Retry Operation |
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LTC4260 |
8.5V to 80V |
Active or |
ACL1 |
Yes |
Yes |
Yes |
Yes |
Onboard 8-Bit ADC for Card Voltage and |
5x5 QFN-32 |
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Ramp |
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Current Monitoring, I2C Interface. Programmable |
SSOP-24 |
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Latchoff or Auto-Retry |
SO-24 |
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LTC4261 |
–12V to –100V |
Ramp |
ACL1 |
Yes |
Yes |
Yes |
Delayed |
Onboard 10-Bit ADC for Card Voltage and |
4x5 QFN-24 |
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Current Monitoring, I2C Interface. Programmable |
SSOP-28 |
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Latchoff or Auto-Retry |
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LT4356-1/2/3 |
4V to 80V |
Active or |
ACL1 |
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Yes |
Yes |
Surge Stopper: Overvoltage Protection |
4x3 DFN-12 |
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Ramp |
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and Inrush Limiting. Spare Amplifier for |
MSOP-10 |
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UV/OV Monitoring or Linear Regulator. |
SO-16 |
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Latchoff/Auto-Retry Operation |
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1ACL = Active Current Limit |
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HOT SWAP CONTROLLERS – Low VOLTAGE |
053 |
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.
LTC4215: Hot Swap Controller with I2C Compatible Monitoring
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
12V Application with 5A Circuit Breaker |
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12V |
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0.005Ω |
FDC653N |
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VOUT |
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+ |
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CL |
12V |
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34.8k |
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30.1k |
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0.1µF |
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10Ω |
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2 |
1 |
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UV |
VDD |
SENSE+ |
SENSE– |
GATE |
SOURCE |
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CONNECTOR |
CONNECTOR |
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1.18k |
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3.57k |
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P6KE16A |
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3.4k |
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OV |
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FB |
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SDAO |
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EN |
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INTVCC |
SDA |
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SDAI |
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LTC4215UFD |
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SCL |
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SCL |
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ADIN |
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24k |
ALERT |
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ALERT |
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INTVCC |
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INTVCC |
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GPIO |
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ON TIMER |
SS |
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GND |
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0.1µF |
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68nF |
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GND |
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BACKPLANE |
PLUG-IN |
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CARD |
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Input Voltage |
Inrush |
Overcurrent |
Fault |
PWRGD/ |
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Part Number |
Channels |
Range |
Control |
Control |
Output |
Reset |
Description |
Package |
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Low Voltage Hot Swap Controllers |
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LTC4210-1/2/3/4 |
1 |
2.7V to 16.5V |
Active or |
ACL1 |
Yes |
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Active Current Limiting with a Circuit Breaker. |
SOT-23 |
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Ramp |
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Latchoff/Auto-Retry Operation |
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LTC4211 |
1 |
2.5V to 16.5V |
Active or |
ECB2 |
Yes |
Delayed |
No Gate Capacitor Required |
SO-8 |
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Ramp |
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MSOP-8 |
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MSOP-10 |
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LTC4215-1/2/3 |
1 |
2.9V to 16.5V |
Active or |
ACL1 |
Yes |
Yes |
I2C/SMBus Interface, Internal 8-bit ADC, dI/dt |
SSOP-16 |
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Ramp |
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Controlled Soft-Start |
4x5 QFN-24 |
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LTC4216 |
1 |
0V to 6V |
Active or |
ACL1 |
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Delayed |
Ultralow Voltage Hot Swap Controller for 0V to 6V, |
MSOP-10 |
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Ramp |
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with a Separate Supply of 2.3V to 6V. Adjustable |
4x3 DFN-12 |
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Current Limit, Soft-Start and Response Time for |
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Overcurrent Protection |
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LTC4217/-12 |
1 |
2.9V to 26.5V |
Active or |
ACL1 |
Yes |
Yes |
Small Footprint 2A Hot Swap Controller. Integrated |
TSSOP-10 |
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Ramp |
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33mΩ MOSFET and RSENSE. Adjustable, 5% |
5x3 DFN-16 |
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Accurate Current Limit. 2% Accurate Undervoltage |
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and Overvoltage Protection. A Dedicated |
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12V Version (LTC4217-12) Contains Preset |
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12V Specific Thresholds |
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LTC4218/-12 |
1 |
2.9V to 26.5V |
Active or |
ACL1 |
Yes |
Yes |
Adjustable, 5% Accurate (15mV) Current Limit. 2% |
SSOP-16 |
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Ramp |
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Accurate Undervoltage and Overvoltage Protection. |
5x3 DFN-16 |
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A Dedicated 12V Version (LTC4218-12) Contains |
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Preset 12V Specific Thresholds |
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LTC4222 |
2 |
2.9V to 29V |
Active or |
ACL1 |
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Yes |
I2C/SMBus Interface, Internal 10-bit ADC, dI/dt |
5x5 QFN-32 |
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Ramp |
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Controlled Soft-Start. Latchoff/Auto-Retry Operation |
SSOP-36 |
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LTC4223-1/2 |
2 |
10V to 14V |
Active or |
ACL1 |
Yes |
Yes |
Controls 12V and 3.3V Auxiliary Supplies. Integrated |
5x5 QFN-32 |
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2.7V to 6V |
Ramp |
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0.3Ω AUX Switch. Adjustable Current Limit with |
SSOP-36 |
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Circuit Breaker. Latchoff/Auto-Retry Operation |
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1ACL = Active Current Limit
2ECB = Electronic Circuit Breaker
062 IDEAL DIODE CONTROLLERS – HIGH VOLTAGE
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.
POWER DISSIPATION (W)
Power Dissipation vs Load Current
6
5
DIODE (MBR10100)
4
3 |
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POWER |
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SAVED |
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2 |
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1 |
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FET (FDB3632) |
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0 |
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10 |
0 |
2 |
4 |
6 |
8 |
CURRENT (A)
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, 16-Lead MS and SO Packages
Positive and Negative Supply Diode-ORing |
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RTNA |
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RTNB |
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IN1 |
GATE1 |
IN2 |
GATE2 |
OUT |
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LTC435555 |
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GND |
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LOAD |
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VCC |
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LTC4354 |
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DA |
DB |
GA |
GB |
VSS |
VA=-48V |
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VB=-48V |
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Ideal Diode controllers/FUSE MONITOR |
073 |
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 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
48V, 10A Diode-OR |
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VINA |
FDB3632 |
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48V |
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IN |
GATE |
OUT |
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LTC4357 |
VDD |
VOUT TO LOAD |
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GND |
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VINB |
FDB3632 |
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48V |
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IN |
GATE |
OUT |
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LTC4357 |
VDD |
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GND |
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Part Number |
Input Supply Range |
Ideal Diode |
External FET |
Fault Monitoring |
Package |
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High Voltage Ideal Diode Controllers |
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LTC4354 |
–4.5V to –100V (Floating) |
Dual |
N-Channel |
Yes |
3x2 |
DFN-8, SO-8 |
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LTC4355 |
9V to 80V |
Dual |
N-Channel |
Yes |
4x3 |
DFN-14, SO-16, |
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MSOP-16 |
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LTC4357 |
9V to 80V |
Single |
N-Channel |
No |
2x3 |
DFN-6, MSOP-8 |
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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 |
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–48V |
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RETURN |
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100k |
100k |
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FUSE GOOD |
LOGIC |
–48V LOAD |
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SUPPLY |
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VA |
RTN |
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SUPPLY A GOOD |
SUPERVISOR |
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OUT F |
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µP |
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VB |
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LTC1921 |
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FUSE A |
OUT A |
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SUPPLY B GOOD |
LOGIC |
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COMMON |
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FUSE B |
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OUT B |
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SUPPLY A |
F1 |
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–48V |
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SUPPLY B |
F2 |
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–48V |
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Part Number |
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Input Voltage Range |
UV |
OV |
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Package |
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Fuse Monitor
LTC1921 |
–10V to –80V |
Yes |
Yes |
MSOP-8, SO-8 |
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