LINEAR TECHNOLOGY LT3972 Data Sheet manual instructions
Summary
The LT3972 is a high-efficiency, adjustable frequency step-down (buck) switching regulator designed for demanding power supply applications. It provides reliable voltage conversion across a wide input range (3.6V to 33V), featuring low ripple (<15mV) and integrated protections like soft-start and thermal management. Ideal for industrial and distributed power systems, this highly compact regulator includes advanced features such as burst mode control and an integrated boost diode. The technical manual provides comprehensive details on electrical specifications, package configuration, and typical application circuits to facilitate precise system integration.
Page 1 Text Content
LT3972
33V, 3.5A, 2.4MHz
Step-Down Switching Regulator with 75µA Quiescent Current DESCRIPTION FEATURES
■ Wide Input Range: The LT®3972 is an adjustable frequency (200k Hz to 2.4MHz) Operation from 3.6V to 33V monolithic buck switching regulator that accepts input Over-Voltage Lockout Protects Circuits voltages up to 33V (62V Maximum). A high effi ciency Through 62V Transients 95mΩ switch is included on the die along with a boost ■ 3.5A Maximum Output Current Schottky diode and the necessary oscillator, control, and ■ Low Ripple (<15m VP-P) Burst Mode® Operation: logic circuitry. Current mode topology is used for fast IQ = 75μA at 12VIN to 3.3VOUT transient response and good loop stability. Low ripple ■ Adjustable Switching Frequency: 200k Hz to 2.4MHz Burst Mode operation maintains high effi ciency at low ■ Low Shutdown Current: IQ < 1μA output currents while keeping output ripple below 15m V ■ Integrated Boost Diode in a typical application. In addition, the LT3972 can fur- ■ Synchronizable Between 250k Hz to 2MHz ther enhance low output current effi ciency by drawing ■ Power Good Flag bias current from the output when VOUT is above 3V. ■ Saturating Switch Design: 95mΩ On-Resistance Shutdown reduces input supply current to less than 1μA ■ Output Voltage: 0.79V to 30V while a resistor and capacitor on the RUN/SS pin provide a ■ Thermal Protection controlled output voltage ramp (soft-start). A power good
EF FI CI EN CY
■ Soft-Start Capability fl ag signals when VOUT reaches 91% of the programmed ■ Small 10-Pin Thermally Enhanced MSOP and output voltage. The LT3972 is available in 10-Pin MSOP (3mm × 3mm) DFN Packages and 3mm × 3mm DFN packages with exposed pads for
low thermal resistance.
APPLICATIONS
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation.
■ Automotive Battery Regulation All other trademarks are the property of their respective owners.
■ Distributed Supply Regulation
■ Industrial Supplies
■ Wall Transformer Regulation
TYPICAL APPLICATION
5V Step-Down Converter Effi ciency
6.3V TO 33V
3.5A VIN = 12V
TRANSIENT
TO 62V VIN BD
RUN/SS BOOST VIN = 30V
OFF ON
VIN = 24V
VC LT3972 SW
PG VOUT = 5V
63.4k SYNC FB
GND f = 600k Hz
OUTPUT CURRENT (A)
3680 TA01a
3680 TA01
Page Summary Contents For LINEAR TECHNOLOGY LT3972 Data Sheet manual instructions
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 287.51 KB |
| Published | June 16, 2026 |
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Frequently Asked Questions
What is the specified junction temperature operating range?
The operational junction temperature range for these components is –40°C to 125°C.
How does the device signal successful power-up and voltage stability?
It features a Power Good flag, which signals when the output voltage reaches 91% of the programmed OUT voltage.
What are the key benefits of using Burst Mode operation?
Burst Mode maintains high efficiency at low output currents while ensuring minimum output ripple below 15mV.