LINEAR TECHNOLOGY LT3693 Data Sheet manual instructions
Summary
This high-efficiency, adjustable buck switching regulator (DC/DC converter) from Linear Technology is designed for robust voltage conversion across demanding applications. The LT3693 features a wide input range of 3.6V to 36V and an adjustable frequency up to 2.4MHz, delivering up to 3.5A output while maintaining high efficiency. Ideal for engineers developing products that require reliable power management, including automotive systems, industrial supplies, portable electronics, and distributed voltage regulation circuits. The accompanying manual details its advanced features like soft-start capability and Power Good flagging.
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LT3693
36V, 3.5A, 2.4MHz
Step-Down Switching Regulator
FEATURES DESCRIPTIO
■ Wide Input Range: 3.6V to 36V The LT®3693 is an adjustable frequency (200k Hz to ■ 3.5A Maximum Output Current 2.4MHz) monolithic buck switching regulator that accepts ■ Adjustable Switching Frequency: 200k Hz 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 250k Hz 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. All other trademarks are the property of their respective owners.
APPLICATIO
EF FI CI EN CY
■ Automotive Battery Regulation
■ Power for Portable Products
■ Distributed Supply Regulation
■ Industrial Supplies
■ Wall Transformer Regulation
TYPICAL APPLICATIO
5V Step-Down Converter
Effi ciency
6.3V TO 36V
VIN = 12V
VIN BD
OFF ON RUN/SS BOOST
VIN = 34V
VIN = 24V
VC LT3693 SW
536k VOUT = 5V
63.4k SYNC FB L = 4.7μH
f = 600k Hz
OUTPUT CURRENT (A)
3693 TA01a 3693 G01
Page Summary Contents For LINEAR TECHNOLOGY LT3693 Data Sheet manual instructions
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 316.29 KB |
| Published | May 29, 2026 |
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Frequently Asked Questions
What is the input voltage range for the LT3693?
The device accepts a wide input range of 3.6V to 36V.
What are the operating temperature limits?
For the LT3693E and LT3693I, the operating junction temperature range is -40°C to 125°C.
Does it have soft-start capability?
Soft-Start capability is available in both the 10-Pin MSOP and 3mm × 3mm DFN packages.
What is the maximum output current?
The LT3693 supports a maximum output current of 3.5A.