Design Support
Demo Circuits
LTspice/SwitcherCAD III is a powerful FREE circuit simulator and schematic capture program, providing macro models for most of Linear Technology’s switch-mode DC/DC converters, op amps, comparators, linear regulators as well as a library of devices for general analog circuit simulation including discretes. Selected switch-mode DC/DC converters also have demonstration circuit available for free download. These demo circuits are designed to ensure proper performance and have been reviewed by Linear Technology’s factory applications group. Follow the instructions below to run the demo circuits in LTspice/SwitcherCAD III.
- Step 1. If you do not already have a copy of LTSpice, click here to download and install LTSpice / SwitcherCAD III
- Step 2. Once LTSpice is installed, click on any of the circuits below. LTspice should open automatically.
- Step 3. If LTspice / SwitcherCAD III does not automatically open after clicking the above link, 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 demonstartion circuit by selecting "Open" from the "File" menu.
| Part Number | Updated | Download |
|---|---|---|
| LT1071HV - 5A and 2.5A High Efficiency Switching Regulators | May 5th, 2006 | LT1071HV.asc |
| LT1072HV - 1.25A High Efficiency Switching Regulator | May 5th, 2006 | LT1072HV.asc |
| LT1076HV - Step-Down Switching Regulator | May 5th, 2006 | LT1076HV.asc |
| LT1111 - Micropower DC/DC Converter Adjustable and Fixed 5V, 12V | May 26th, 2006 | LT1111.asc |
| LT1172HV - 100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators | May 5th, 2006 | LT1172HV.asc |
| LT1173 - Micropower DC/DC Converter Adjustable and Fixed 5V, 12V | Jun 12th, 2006 | LT1173.asc |
| LT1308B - Single Cell High CurrentMicropower 600kHz Boost DC/DC Converter | May 26th, 2006 | LT1308B.asc |
| LT1370HV - 500kHz High Efficiency 6A Switching Regulator | May 26th, 2006 | LT1370HV.asc |
| LT1374HV - 4.5A, 500kHz Step-Down Switching Regulator | May 5th, 2006 | LT1374HV.asc |
| LT1376 - 1.5A, 500kHz Step-Down Switching Regulators | May 5th, 2006 | LT1376.asc |
| LT1377 - 500kHz and 1MHz High Efficiency 1.5A Switching Regulators | May 5th, 2006 | LT1377.asc |
| LT1613 - 1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23 | May 26th, 2006 | LT1613.asc |
| LT1615 - Micropower Step-Up DC/DC Converters in ThinSOT | Mar 13th, 2006 | LT1615_boost.asc |
| LT1615 - Micropower Step-Up DC/DC Converters in ThinSOT | Mar 13th, 2006 | LT1615_sepic.asc |
| LT1615-1 - Micropower Step-Up DC/DC Converters in ThinSOT | May 26th, 2006 | LT1615-1.asc |
| LT1616 - 600mA, 1.4MHz Step-Down Switching Regulator in SOT-23 | May 26th, 2006 | LT1616.asc |
| LT1617-1 - Micropower Inverting DC/DC Converters in SOT-23 | May 26th, 2006 | LT1617-1.asc |
| LT1618 - Constant-Current/Constant-Voltage 1.4MHz Step-Up DC/DC Converter | Mar 15th, 2006 | LT1618.asc |
| LT1619 - Low Voltage Current Mode PWM Controller | Aug 4th, 2006 | LT1619.asc |
| LT1765 - Monolithic 3A, 1.25MHz Step-Down Switching Regulators | May 5th, 2006 | LT1765.asc |
| LT1766 - High Voltage 1.5A, 200kHz Step-Down Switching Regulators | May 15th, 2006 | LT1766.asc |
| LT1767 - Monolithic 1.5A, 1.25MHz Step-Down Switching Regulators | Mar 13th, 2006 | LT1767.asc |
| LT1930 - 1A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters in ThinSOT | Jun 12th, 2006 | LT1930.asc |
| LT1930A - 1A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters in ThinSOT | Mar 13th, 2006 | LT1930A.asc |
| LT1931A - 1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT | May 15th, 2006 | LT1931A.asc |
| LT1932 - Constant-Current DC/DC LED Driver in ThinSOT | May 26th, 2006 | LT1932.asc |
| LT1933 - 600mA, 500kHz Step-Down Switching Regulator in SOT-23 | May 26th, 2006 | LT1933.asc |
| LT1934-1 - Micropower Step-Down Switching Regulators in ThinSOT | May 26th, 2006 | LT1934-1.asc |
| LT1936 - 1.4A, 500kHz Step-Down Switching Regulator | Mar 28th, 2006 | LT1936.asc |
| LT1937 - White LED Step-Up Converter in SC70 and ThinSOT | May 26th, 2006 | LT1937.asc |
| LT1941 - Triple Monolithic Switching Regulator | Jul 23rd, 2007 | LT1941.asc |
| LT1945 - Dual Micropower DC/DC Converter with Positive and Negative Outputs | Apr 5th, 2006 | LT1945.asc |
| LT1976/LT1976B - High Voltage 1.5A, 200kHz Step-Down Switching Regulator with 100µA Quiescent Current | May 15th, 2006 | LT1976.asc |
| LT3010/LT3010-5 - 50mA, 3V to 80V Low Dropout Micropower Regulator | Feb 1st, 2007 | LT3010.asc |
| LT3012 - 250mA, 4V to 80V Low Dropout Micropower Linear Regulator | Feb 1st, 2007 | LT3012.asc |
| LT3013 - 250mA, 4V to 80V Low Dropout Micropower Linear Regulator with PWRGD | Feb 1st, 2007 | LT3013.asc |
| LT3014 - 20mA, 3V to 80V Low Dropout Micropower Linear Regulator | Feb 1st, 2007 | LT3014.asc |
| LT3080 - Adjustable 1.1A Single Resistor Low Dropout Regulator | Feb 26th, 2008 | LT3080.asc |
| LT3430 - High Voltage, 3A, 200kHz Step-Down Switching Regulator | May 15th, 2006 | LT3430.asc |
| LT3431 - High Voltage, 3A, 500kHz Step-Down Switching Regulator | Jun 2nd, 2006 | LT3431.asc |
| LT3433 - High Voltage Step-Up/Step-Down DC/DC Converter | May 15th, 2006 | LT3433.asc |
| LT3437 - High Voltage 500mA, 200kHz Step-Down Switching Regulator with 100µA Quiescent Current | May 5th, 2006 | LT3437.asc |
| LT3465A - 2.4MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT | May 26th, 2006 | LT3465A.asc |
| LT3466 - Dual Full Function White LED Step-Up Converter with Built-In Schottky Diodes | May 15th, 2006 | LT3466.asc |
| LT3467 - 1.1A Step-Up DC/DC Converter with Integrated Soft-Start | Jun 12th, 2006 | LT3467.asc |
| LT3467A - 1.1A Step-Up DC/DC Converter with Integrated Soft-Start | May 15th, 2006 | LT3467A.asc |
| LT3470 - Micropower Buck Regulator with Integrated Boost and Catch Diodes | Mar 28th, 2006 | LT3470.asc |
| LT3471 - Dual 1.3A, 1.2MHz Boost/Inverter in 3mm × 3mm DFN | May 15th, 2006 | LT3471.asc |
| LT3473 - Micropower 1A Boost Converter with Schottky and Output Disconnect | Mar 28th, 2006 | LT3473.asc |
| LT3474/LT3474-1 - Step-Down 1A LED Driver | May 5th, 2006 | LT3474.asc |
| LT3475/LT3475-1 - Dual Step-Down 1.5A LED Driver | Sep 29th, 2006 | LT3475.asc |
| LT3476 - High Current Quad Output LED Driver | Sep 8th, 2006 | LT3476.asc |
| LT3477 - 3A, DC/DC Converter with Dual Rail-to-Rail Current Sense | May 5th, 2006 | LT3477.asc |
| LT3479 - 3A, Full Featured DC/DC Converter with Soft-Start and Inrush Current Protection | May 15th, 2006 | LT3479.asc |
| LT3480 - 38V, 2A, 2.4MHz Step-Down Switching Regulator with 70µA Quiescent Current | Sep 14th, 2007 | LT3480.asc |
| LT3481 - 36V, 2A, 2.8MHz Step-Down Switching Regulator with 50µA Quiescent Current | May 15th, 2006 | LT3481.asc |
| LT3482 - 90V Boost DC/DC Converter with APD Bias Current Monitor | Jun 19th, 2007 | LT3482.asc |
| LT3483 - Inverting Micropower DC/DC Converter with Schottky | Mar 28th, 2006 | LT3483.asc |
| LT3484-0 - Photoflash Capacitor Charger | Sep 1st, 2006 | LT3484_0.asc |
| LT3485-0 - Photoflash Capacitor Chargers with Output Voltage Monitor and Integrated IGBT Drive | Sep 8th, 2006 | LT3485_0.asc |
| LT3486 - Dual 1.3A White LED Step-Up Converters with Wide Dimming Range | Sep 29th, 2006 | LT3486.asc |
| LT3487 - Boost and Inverting Switching Regulator for CCD Bias | Sep 29th, 2006 | LT3487.asc |
| LT3489 - 2MHz Boost DC/DC Converter with 2.5A Switch and Soft-Start | Sep 29th, 2006 | LT3489.asc |
| LT3491 - White LED Driver in SC70 with Integrated Schottky | Sep 1st, 2006 | LT3491.asc |
| LT3493 - 1.2A, 750kHz Step-Down Switching Regulator in 2mm × 3mm DFN | May 15th, 2006 | LT3493.asc |
| LT3494 - Micropower Low Noise Boost Converters with Output Disconnect | Jun 19th, 2007 | LT3494.asc |
| LT3494A - Micropower Low Noise Boost Converters with Output Disconnect | Jun 19th, 2007 | LT3494A.asc |
| LT3496 - Triple Output LED Driver | Mar 17th, 2008 | LT3496_Buck_Boost.asc |
| LT3496 - Triple Output LED Driver | Mar 17th, 2008 | LT3496_Buck.asc |
| LT3496 - Triple Output LED Driver | Mar 17th, 2008 | LT3496_Boost.asc |
| LT3497 - Dual Full Function White LED Driver with Integrated Schottky Diodes | Jan 16th, 2008 | LT3497.asc |
| LT3501 - Monolithic Dual Tracking 3A Step-Down Switching Regulator | Feb 1st, 2007 | LT3501.asc |
| LT3502 - 1.1MHz/2.2MHz, 500mA Step-Down Regulators in 2mm x 2mm DFN | Aug 29th, 2007 | LT3502A.asc |
| LT3502 - 1.1MHz/2.2MHz, 500mA Step-Down Regulators in 2mm x 2mm DFN | Aug 29th, 2007 | LT3502.asc |
| LT3503 - 1A, 2.2MHz Step-Down Switching Regulator in 2mm x 3mm DFN | Oct 24th, 2006 | LT3503.asc |
| LT3505 - 1.2A, Step-Down Switching Regulator in 3mm x 3mm DFN | Sep 8th, 2006 | LT3505.asc |
| LT3506 - Dual Monolithic 1.6A Step-Down Switching Regulator | Aug 4th, 2006 | LT3506.asc |
| LT3506A - Dual Monolithic 1.6A Step-Down Switching Regulator | Aug 4th, 2006 | LT3506A.asc |
| LT3508 - Dual Monolithic 1.4A Step-Down Switching Regulator | Aug 29th, 2007 | LT3508.asc |
| LT3510 - Monolithic Dual Tracking 2A Step-Down Switching Regulator | Feb 1st, 2007 | LT3510.asc |
| LT3580 - Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization | Jan 16th, 2008 | LT3580.asc |
| LT3585-0 - Photoflash Charger with Adjustable Input Current and IGBT Driver | Jun 19th, 2007 | LT3585_0.asc |
| LT3591 - White LED Driver with Integrated Schottky in 3mm x 2mm DFN | Jan 16th, 2008 | LT3591.asc |
| LT3680 - 36V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75µA Quiescent Current | Sep 14th, 2007 | LT3680.asc |
| LT3681 - 36V, 2A, 2.8MHz Step-Down Switching Regulator with Integrated Power Schottky Diode | Jun 19th, 2007 | LT3681.asc |
| LT3684 - 36V, 2A, 2.8MHz Step-Down Switching Regulator | Sep 14th, 2007 | LT3684.asc |
| LT3685 - 36V, 2A, 2.4MHz Step-Down Switching Regulator | Sep 14th, 2007 | LT3685.asc |
| LT3693 - 36V, 3.5A, 2.4MHz Step-Down Switching Regulator | Oct 5th, 2007 | LT3693.asc |
| LT3724 - High Voltage, Current Mode Switching Regulator Controller | May 5th, 2008 | LT3724.asc |
| LT3740 - Wide Operating Range, Valley Mode, No RSENSE Synchronous Step-Down Controller | Apr 12th, 2007 | LT3740.asc |
| LT3750 - Capacitor Charger Controller | Sep 1st, 2006 | LT3750.asc |
| LT3782 - 2-Phase Step-Up DC/DC Controller | Apr 5th, 2006 | LT3782.asc |
| LT3800 - High-Voltage Synchronous Current Mode Step-Down Controller | Mar 28th, 2006 | LT3800.asc |
| LT3825 - Isolated No-Opto Synchronous Flyback Controller with Wide Input Supply Range | Jun 8th, 2007 | LT3825_DC894A-A.asc |
| LT4356-1 - Overvoltage Protection Regulator and Inrush Limiter | Feb 26th, 2008 | LT4356-1.asc |
| LTC1624 - High Efficiency SO-8 N-Channel Switching Regulator Controller | Mar 17th, 2008 | LTC1624.asc |
| LTC1702A - Dual 550kHz Synchronous 2-Phase Switching Regulator Controller | Mar 15th, 2006 | LTC1702A.asc |
| LTC1778 - Wide Operating Range, No RSENSE Step-Down Controller | Mar 17th, 2006 | LTC1778.asc |
| LTC1871 - Wide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller | May 5th, 2006 | LTC1871_sepic.asc |
| LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 - 500mA Output Current Low Noise Dual Mode Step-Up Charge Pumps | Oct 30th, 2006 | LTC3203B.asc |
| LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 - 500mA Output Current Low Noise Dual Mode Step-Up Charge Pumps | Oct 30th, 2006 | LTC3203-1.asc |
| LTC3204-3.3/LTC3204B-3.3 - Low Noise Regulated Charge Pump in 2 × 2 DFN | Oct 30th, 2006 | LTC3204-3.3.asc |
| LTC3204-5/LTC3204B-5 - Low Noise Regulated Charge Pump in 2 × 2 DFN | Oct 30th, 2006 | LTC3204-5.asc |
| LTC3240 - 3.3V/2.5V Step-Up/Step-Down Charge Pump DC/DC Converter | Oct 30th, 2006 | LTC3240-2.5.asc |
| LTC3240 - 3.3V/2.5V Step-Up/Step-Down Charge Pump DC/DC Converter | Oct 30th, 2006 | LTC3240-3.3.asc |
| LTC3406 - 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT | Mar 17th, 2008 | LTC3406.asc |
| LTC3406B - 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT | Mar 17th, 2008 | LTC3406B.asc |
| LTC3407 - Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Regulator | Jul 14th, 2006 | LTC3407.asc |
| LTC3407-2 - Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator | Jul 14th, 2006 | LTC3407-2.asc |
| LTC3409 - 600mA Low VIN Buck Regulator in 3mm × 3mm DFN | Mar 28th, 2006 | LTC3409.asc |
| LTC3410 - 2.25MHz, 300mA Synchronous Step-Down Regulator in SC70 | Mar 17th, 2008 | LTC3410.asc |
| LTC3410B - 2.25MHz, 300mA Synchronous Step-Down Regulator in SC70 | Mar 17th, 2008 | LTC3410B.asc |
| LTC3411 - 1.25A, 4MHz, Synchronous Step-Down DC/DC Converter | May 11th, 2007 | LTC3411.asc |
| LTC3412A - 3A, 4MHz, Monolithic Synchronous Step-Down Regulator | Mar 28th, 2006 | LTC3412A.asc |
| LTC3415 - 7A, PolyPhase Synchronous Step-Down Regulator | Jul 23rd, 2007 | LTC3415.asc |
| LTC3417 - Dual Synchronous 1.4A/800mA 4MHz Step-Down DC/DC Regulator | Jul 14th, 2006 | LTC3417.asc |
| LTC3418 - 8A, 4MHz, Monolithic Synchronous Step-Down Regulator | Mar 27th, 2006 | LTC3418.asc |
| LTC3440 - Micropower Synchronous Buck-Boost DC/DC Converter | Mar 28th, 2006 | LTC3440.asc |
| LTC3444 - Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications | Mar 17th, 2008 | LTC3444.asc |
| LTC3458L - 1.7A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect | Mar 17th, 2008 | LTC3458L.asc |
| LTC3526 - 500mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm x 2mm DFN | Jun 8th, 2007 | LTC3526B.asc |
| LTC3526 - 500mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm x 2mm DFN | Jun 8th, 2007 | LTC3526.asc |
| LTC3526-2 - 500mA 2MHz Synchronous Step-Up DC/DC Converter in 2mm x 2mm DFN | Jun 8th, 2007 | LTC3526-2.asc |
| LTC3526B-2 - 500mA 2MHz Synchronous Step-Up DC/DC Converter in 2mm x 2mm DFN | Jun 8th, 2007 | LTC3526B-2.asc |
| LTC3531 - 200mA Buck-Boost Synchronous DC/DC Converters | Mar 17th, 2008 | LTC3531.asc |
| LTC3547 - Dual Monolithic 300mA Synchronous Step-Down Regulator | May 11th, 2007 | LTC3547.asc |
| LTC3548 - Dual Synchronous, 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator | Mar 20th, 2006 | LTC3548.asc |
| LTC3549 - 250mA Low VIN Buck Regulator in 2mm x 3mm DFN | Aug 29th, 2007 | LTC3549.asc |
| LTC3560 - 2.25MHz, 800mA Synchronous Step-Down Regulator in ThinSOT | Mar 25th, 2008 | LTC3560.asc |
| LTC3561 - 1A, 4MHz, Synchronous Step-Down DC/DC Converter | May 11th, 2007 | LTC3561.asc |
| LTC3727-1 - High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators | May 26th, 2006 | LTC3727-1.asc |
| LTC3728 - Dual, 550kHz, 2-Phase Synchronous Step-Down Switching Regulator | Mar 17th, 2006 | LTC3728.asc |
| LTC3731 - 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller | Mar 20th, 2006 | LTC3731.asc |
| LTC3736-1 - Dual 2-Phase, No RSENSE Synchronous Controller with Spread Spectrum | Mar 17th, 2006 | LTC3736-1.asc |
| LTC3736-2 - Dual 2-Phase, No RSENSE Synchronous Controller with Output Tracking | Mar 17th, 2006 | LTC3736-2.asc |
| LTC3770 - Fast No RSENSE Step-Down Synchronous Controller with Margining, Tracking and PLL | Jun 2nd, 2006 | LTC3770.asc |
| LTC3772 - Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller | Mar 28th, 2006 | LTC3772.asc |
| LTC3772B - Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller | Mar 28th, 2006 | LTC3772B.asc |
| LTC3776 - Dual 2-Phase, No RSENSE Synchronous Controller for DDR/QDR Memory Termination | Mar 28th, 2006 | LTC3776.asc |
| LTC3780 - High Efficiency, Synchronous, 4-Switch Buck-Boost Controller | Mar 15th, 2006 | LTC3780.asc |
| LTC3809-1 - No Rsense, Low Input Voltage, Synchronous DC/DC Controller with Output Tracking | Mar 28th, 2006 | LTC3809-1.asc |
| LTC3823 - Fast No Rsense Step-Down Synchronous Controller with Differential Output Sensing, Tracking and PLL | Mar 17th, 2008 | LTC3823.asc |
| LTC3832 - High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation | Mar 15th, 2006 | LTC3832.asc |
| LTC3835 - Low IQ Synchronous Step-Down Controller | Aug 29th, 2007 | LTC3835.asc |
| LTC3850 - Dual, 2-Phase Synchronous Step-Down Switching Controller | Oct 5th, 2007 | LTC3850.asc |
| LTC3872 - No RSENSE Current Mode Boost DC/DC Controller | Oct 30th, 2006 | LTC3872.asc |
| LTC4441 - N-Channel MOSFET Gate Driver | May 26th, 2006 | LTC4441.asc |
| LTM4600 - 10A High Efficiency DC/DC µModule | Jan 30th, 2006 | LTM4600.asc |
| LTM4601 - 12A DC/DC µModule with PLL, Output Tracking and Margining | Feb 5th, 2008 | LTM4601.asc |
| LTM4601 - 12A DC/DC µModule with PLL, Output Tracking and Margining | Feb 5th, 2008 | LTM4601-1.asc |
| LTM4602 - 6A High Efficiency DC/DC µModule | Aug 30th, 2007 | LTM4602.asc |
| LTM4603 - 6A DC/DC µModule with PLL, Output Tracking and Margining | May 3rd, 2007 | LTM4603.asc |
| LTM4603 - 6A DC/DC µModule with PLL, Output Tracking and Margining | Feb 8th, 2008 | LTM4603-1.asc |
| LTM8022 - 1A, 36V DC/DC µModule | Mar 17th, 2008 | LTM8022.asc |
| LTM8023 - 2A, 36V DC/DC µModule | Mar 17th, 2008 | LTM8023.asc |
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