LT8614
42V, 4A Synchronous
Step-Down Silent Switcher
with 2.5µA Quiescent Current
FEATURES
DESCRIPTION
Silent Switcher® Architecture
The LT®8614 step-down regulator features Silent Switcher
architecture designed to minimize EMI emissions while
delivering high efficiency at frequencies up to 3MHz.
Assembled in a 3mm × 4mm QFN, the monolithic con-
struction with integrated power switches and inclusion of
all necessary circuitry yields a solution with a minimal PCB
footprint. An ultralow 2.5µA quiescent current—with the
output in full regulation— enables applications requiring
highest efficiency at very small load currents. Transient
response remains excellent and output voltage ripple is
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Ultralow EMI Emissions
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High Efficiency at High Frequency
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Up to 96% Efficiency at 1MHz, 12V to 5V
IN
IN
OUT
OUT
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Up to 94% Efficiency at 2MHz, 12V to 5V
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Wide Input Voltage Range: 3.4V to 42V
Ultralow Quiescent Current Burst Mode® Operation:
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2.5μA I Regulating 12V to 3.3V
Q
IN
P-P
OUT
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Output Ripple < 10mV
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Fast Minimum Switch On-Time: 30ns
Low Dropout Under All Conditions: 125mV at 1A
Safely Tolerates Inductor Saturation in Overload
Adjustable and Synchronizable: 200kHz to 3MHz
Peak Current Mode Operation
below 10mV at any load, from zero to full current.
P-P
The LT8614 allows high VIN to low VOUT conversion at high
frequency with a fast minimum top switch on-time of 30ns.
Operation is safe in overload even with a saturated inductor.
Accurate 1V Enable Pin Threshold
Essential features are included and easy to use: An open-
drain PG pin signals when the output is in regulation. The
SYNC pin allows clock synchronization and choice of Burst
Mode operation or pulse-skipping mode. Soft-start and
tracking functionality is accessed via the TR/SS pin. An
accurate enable threshold can be set using the EN/UV pin
and a resistor at the RT pin programs switch frequency.
Internal Compensation
Output Soft-Start and Tracking
Small 18-Lead 3mm × 4mm QFN
AEC-Q100 Qualified for Automotive Applications
APPLICATIONS
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All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. patents, including 8823345.
Automotive and Industrial Supplies
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General Purpose Step-Down
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GSM Power Supplies
12VIN to 5VOUT Efficiency
TYPICAL APPLICATION
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5V 4A Step-Down Converter
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Rev. F
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