LT8604
High Efficiency 42V/120mA
Synchronous Buck
FEATURES
DESCRIPTION
The LT®8604 is a compact, high speed synchronous
monolithic step-down switching regulator that delivers up
to 120mA with high efficiency at constant switching fre-
quency, even up to 2.2MHz. It accepts a wide input voltage
range up to 42V, and consumes only 2.5µA of quiescent
current. Top and bottom power switches are included with
all necessary circuitry to minimize the need for external
components. Low ripple Burst Mode operation enables
high efficiency down to very low output currents while
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High Efficiency 2MHz Synchronous Operation
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> 90% Efficiency at 50mA, 12V to 5V
IN
OUT
Ultralow Quiescent Current Burst Mode® Operation
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< 2.5µA I Regulating 24V to 3.3V
Q
IN
OUT
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Output Ripple < 10mV
P-P
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Wide Input Voltage Range: 3.2V to 42V
Fast Minimum Switch-On Time: 35ns
Adjustable Switching Frequency: 200kHz to 2.2MHz
Allows Tiny Inductors
Accurate 1V Enable Pin Threshold
Internal Compensation
Output Soft-Start and Tracking
Small 10-Lead 3mm × 2mm Side-Wettable
DFN Package
AEC-Q100 Qualified for Automotive Applications
keeping the output ripple below 10mV
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P-P
Additional features provide for flexible and robust opera-
tion. Internal compensation with peak current mode topol-
ogy allows the use of small inductors and results in fast
transient response and good loop stability. The EN/UV pin
has an accurate 1V threshold and can be used to program
VIN under voltage lockout or to shut down the LT8604
reducing the input supply current to 1µA. A PG flag sig-
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APPLICATIONS
nals when V
is within 7.5% of the programmed out-
OUT
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Industrial Sensors
put voltage as well as fault conditions. Thermal shutdown
provides additional protection. The LT8604 is available in
a small 10-Lead 3mm × 2mm DFN package with exposed
pad for low thermal resistance.
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Industrial Internet of Things
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4mA to 20mA Current Loops
Flow Meters
Automotive Housekeeping Supplies
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All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
5V, Step-Down Converter
Efficiency at VOUT = 5V
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