LTC6909 - 1 to 8 Output, Multiphase Oscillator with Spread Spectrum Modulation

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LTC4359 - Ideal Diode Controller with Reverse Input Protection

LT3972 - 33V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75μA Quiescent Current

Features

Wide Input Range:
Operation from 3.6V to 33V
Over-Voltage Lockout Protects Circuits
Through 62V Transients
3.5A Maximum Output Current
Low Ripple (<15mV_P-P) Burst Mode® Operation: I_Q= 75μA at 12V_IN to 3.3V_OUT
Adjustable Switching Frequency: 200kHz to 2.4MHz
Low Shutdown Current: I_Q < 1μA
Integrated Boost Diode
Synchronizable Between 250kHz to 2MHz
Power Good Flag
Saturating Switch Design: 95mΩ On-Resistance
Output Voltage: 0.79V to 30V
Thermal Protection
Soft-Start Capability
Small 10-Pin Thermally Enhanced MSOP and (3mm × 3mm) DFN Packages

Typical Application

Description

The LT3972 is an adjustable frequency (200kHz to 2.4MHz) monolithic buck switching regulator that accepts input voltages up to 33V (62V Maximum). A high efficiency 95mΩ switch is included on the die along with a boost Schottky diode and the necessary oscillator, control, and logic circuitry. Current mode topology is used for fast transient response and good loop stability. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15mV in a typical application. In addition, the LT3972 can further enhance low output current efficiency by drawing bias current from the output when V_OUT is above 3V Shutdown reduces input supply current to less than 1μA while a resistor and capacitor on the RUN/SS pin provide a controlled output voltage ramp (soft-start). A power good flag signals when V_OUT reaches 91% of the programmed output voltage. The LT3972 is available in 10-Pin MSOP and 3mm × 3mm DFN packages with exposed pads for low thermal resistance.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

MS-10, DFN-10

Order Info

Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)^*	RoHS Data
LT3972EDD#PBF	DFN	10	E	$6.07	$4.25	View
LT3972EDD#TRPBF	DFN	10	E		$4.31	View
LT3972EMSE#PBF	MSOP	10	E	$6.36	$4.45	View
LT3972EMSE#TRPBF	MSOP	10	E		$4.51	View
LT3972HMSE#PBF	MSOP	10	H	$7.82	$5.47	View
LT3972HMSE#TRPBF	MSOP	10	H		$5.53	View
LT3972IDD#PBF	DFN	10	I	$7.29	$5.10	View
LT3972IDD#TRPBF	DFN	10	I		$5.16	View
LT3972IMSE#PBF	MSOP	10	I	$7.63	$5.22	View
LT3972IMSE#TRPBF	MSOP	10	I		$5.28	View
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^* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number	Description	Price	Documentation
DC1458A	LT3972EMSE DEMO BOARD \| 36V, 3.5A, 2.4MHz Step-Dow	$175.00	Design File Manual Schematic ltspice
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Click here to view our complete list of demo boards

Applications

Automotive Battery Regulation
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation

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Simulate

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.

To launch a ready to run LTspice demonstration circuit for this part:

Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- LT3972 Demo Circuit - 3.5A, 33V, 2.4MHz Step-Down Regulator with 75µA Iq (24V to 5V @ 3.5A)
Step 3: If LTspice IV does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As". After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Related models available in LTspice IV
LT3972

Technical Support

For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.