Datasheet LT3693 (Analog Devices)

LT3693 36V, 3.5A, 2.4MHz Step-Down Switching Regulator
U FEATURES DESCRIPTIO
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Wide Input Range: 3.6V to 36V
The LT®3693 is an adjustable frequency (200kHz to ■
3.5A Maximum Output Current
2.4MHz) monolithic buck switching regulator that accepts ■
Adjustable Switching Frequency: 200kHz to 2.4MHz
input voltages up to 36V. A high effi ciency 95m switch ■
Low Shutdown Current: IQ < 1μA
is included on the die along with a boost Schottky diode ■
Integrated Boost Diode
and the necessary oscillator, control, and logic circuitry. ■
Synchronizable Between 250kHz to 2MHz
Current mode topology is used for fast transient response ■ Power Good Flag and good loop stability. Shutdown reduces input supply ■ Saturating Switch Design: 95m On-Resistance current to less than 1μA while a resistor and capacitor on ■ 0.790V Feedback Reference Voltage the RUN/SS pin provide a controlled output voltage ramp ■ Output Voltage: 0.79V to 30V (soft-start). A power good fl ag signals when VOUT reaches ■ Thermal Protection 91% of the programmed output voltage. The LT3693 is ■ Soft-Start Capability available in 10-Pin MSOP and 3mm × 3mm DFN packages ■ Small 10-Pin Thermally Enhanced MSOP and with exposed pads for low thermal resistance. (3mm × 3mm) DFN Packages , LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
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All other trademarks are the property of their respective owners.
APPLICATIO S
■ Automotive Battery Regulation ■ Power for Portable Products ■ Distributed Supply Regulation ■ Industrial Supplies ■ Wall Transformer Regulation
U TYPICAL APPLICATIO 5V Step-Down Converter Effi ciency
V V OUT 100 IN 5V 6.3V TO 36V 3.5A VIN = 12V VIN BD 90 OFF ON RUN/SS BOOST VIN = 34V 80 V 0.47mF IN = 24V 15k 4.7mH V LT3693 SW C 10mF 70 RT EFFICIENCY (%) 680pF PG 60 536k VOUT = 5V 63.4k SYNC FB L = 4.7μH GND f = 600kHz 100k 47mF 50 0 0.5 1 1.5 2 2.5 3 3.5 OUTPUT CURRENT (A) 3693 TA01a 3693 G01 3693f 1