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Linear Technology - High Efficiency Switching Surge Stopper

Numéro de référence LTC7860
Description High Efficiency Switching Surge Stopper
Fabricant Linear Technology 
Logo Linear Technology 





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LTC7860 fiche technique
LTC7860
High Efficiency Switching
Surge Stopper
Features
nn High Efficiency VOUT Clamp Stops High Voltage
Input Surges
nn SWITCH-ON Mode 100% Duty Cycle for Normal Operation
nn PROTECTIVE PWM Mode for Transients and Faults
nn
nn
VIN Pin to SGND Range: 3.5V to 60V
External Input Voltage is Extendable
to
200V+
nn Adjustable Output Voltage Clamp
nn Adjustable Output Overcurrent Protection
nn Power Inductor Improves Input EMI in Normal Operation
nn Programmable Fault Timer
nn Adjustable Soft-Start for Input Inrush Current Limiting
nn 4.5% Retry Duty Cycle During Faults
nn Adjustable Switching Frequency: 50kHz to 850kHz
nn Optional Reverse Input Voltage Protection
nn Available in Thermally Enhanced 12-lead MSOP Package
Applications
nn Industrial and Automotive Power
nn Telecom Power
nn Vehicle Power Including ISO7637
nn Military Power Including MIL1275
L, LT, LTC, LTM, OPTI-LOOP, Linear Technology, Burst Mode and the Linear logo are registered
trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks
are the property of their respective owners. Protected by U.S. Patents including 5731694.
Description
The LTC®7860 high efficiency surge stopper protects loads
from high voltage transients. High efficiency permits
higher currents and smaller solution sizes. During an
input overvoltage event, such as a load dump in vehicles,
the LTC7860 controls the gate of an external MOSFET to
act as a switching DC/DC regulator (PROTECTIVE PWM
mode). This operation regulates the output voltage to a
safe level, allowing the loads to operate through the input
over-voltage event. During normal operation (SWITCH-
ON mode), the LTC7860 turns on the external MOSFET
continuously, passing the input voltage through to the
output. An internal comparator limits the voltage across
the current sense resistor and regulates the maximum
output current to protect against overcurrent faults.
An adjustable timer limits the time that the LTC7860 can
spend in overvoltage or overcurrent regulation. When the
timer expires, the external MOSFET is turned off until the
LTC7860 restarts after a cool down period. By strictly
limiting the time in PROTECTIVE PWM Mode when the
power loss is high, the components and thermal design
can be optimized for normal operation and safely oper-
ate through high voltage input surges and/or overcurrent
faults. An additional PMOS can be added for reverse
battery protection.
Typical Application
VIN
60V MAX
12V NOM
3.5V MIN
10µF
12mΩ
6.8µH
VOUT
18V MAX
12V NOM
3.5V MIN
5A
PROTECTIVE PWM: VOUT Clamped
to 18V During a VIN Surge
60V INPUT SURGE
CTMR = 22µF
0.47µF
VFBN
FREQ
CAP
VFB
LTC7860 TMR
0.1µF
10k 680pF RUN
ITH
SGND PGND
SS
1M
10µF
22µF
48.7k
0.1µF
7860 TA01a
VIN
10V/DIV
VOUT
10V/DIV
VTMR
1V/DIV
18V ADJUSTABLE CLAMP
100ms/DIV
7860 TA01b
7860f
For more information www.linear.com/LTC7860
1

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