LTC7862
140V High Efficiency
Switching Surge Stopper
FEATURES
DESCRIPTION
The LTC®7862 high efficiency switching surge stopper pro
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V
Clamp Stops High Voltage Input Surges
OUT
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100% Duty Cycle Pass-Through Mode During
tects loads from high voltage transients. High efficiency
switching allows high output currents, small solution sizes,
and high reliability. During an input overvoltage event, the
LTC7862 controls the gates of two external N-channel
MOSFETs to act as a switching DC/DC step-down regu-
lator. This maintains the output voltage at a safe value,
allowing the loads to continue to operate through the input
overvoltage event. During normal operation, the LTC7862
turns on the top external N-channel MOSFET continuously,
passing the input voltage through to the output, with mini-
mal voltage drop. Using a fast peak current comparator,
the LTC7862 also limits the maximum output current to
protect against overcurrent and short-circuit faults.
Normal Operation
Switches During Overvoltage or Overcurrent
Transients and Faults and During Startup
High Efficiency Switching Enables Long Duration
Surge Protection and High Output Currents
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Wide V Range: 4V to 140V (150V Abs Max)
IN
Adjustable Output Voltage Clamp Up to 60V
Adjustable Output Overcurrent Protection
R
or Inductor DCR Current Sensing
SENSE
Power Inductor Reduces Input EMI in Normal Mode
Adjustable Soft-Start for Inrush Current Limiting
Programmable Fault Timer
Open-Drain Fault Warning Indicator
2.7% Retry Duty Cycle During Faults
An adjustable timer limits the time that the LTC7862 can
spend switching during an overvoltage, overcurrent, or
startup condition. When the timer expires, the external
MOSFETs are turned off for a cooldown period and then
the LTC7862 restarts. By strictly limiting how long the
LTC7862 can switch, when the power loss is relatively
high, the components and thermal design can be opti-
mized for normal pass-through operation while still safely
operating through high voltage input surges and/or over-
current events.
Adjustable Switching Frequency: 50kHz to 900kHz
Adjustable Input Voltage Turn-On Threshold
Adjustable Input Overvoltage Lockout Threshold
20-Pin 4mm × 5mm QFN and TSSOP Packages
APPLICATIONS
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Automotive/Avionic/Industrial Surge Protection
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Automotive Load Dump Protection
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Vehicle Power Including ISO7637
Military Power Including MIL1275
All registered trademarks and trademarks are the property of their respective owners.
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TYPICAL APPLICATION
28V, 20A with 100V Overvoltage Protection
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ꢀꢁ
ꢀꢁꢂꢃ ꢄꢅ
ꢂꢃꢄ
Overvoltage Protector Regulates
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ꢀ
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ꢈꢉ
ꢁꢂꢃ
ꢎ0ꢇ
Output at 28V During VIN Transient
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ꢇꢈꢑ
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Rev 0
1
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