LT3501 - Monolithic Dual Tracking 3A Step-Down Switching Regulator
- Wide Input Range: 3.1V to 25V
- Two Switching Regulators with 3A Output Capability
- Independent Supply to Each Regulator
- Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 1.5MHz
- Antiphase Switching
- Outputs Can be Paralleled
- Independent, Sequential, Ratiometric or Absolute Tracking Between Outputs
- Independent Soft-Start and Power Good Pins
- Enhanced Short-Circuit Protection
- Low Dropout: 95% Maximum Duty Cycle
- Low Shutdown Current: <10µA
- 20-Lead TSSOP Package with Exposed Leadframe
AEC-Q100 data available for specific packages
DescriptionThe LT3501 is a dual current mode PWM step-down DC/DC converter with two internal 3.5A switches. Independent input voltage, feedback, soft-start and power good pins for each channel simplify complex power supply tracking/sequencing requirements.
Both converters are synchronized to either a common external clock input or a resistor programmable ﬁ xed 250kHz to 1.5MHz internal oscillator. At all frequencies, a 180° phase relationship between channels is maintained, reducing voltage ripple and component size. Programmable frequency allows for optimization between efﬁ ciency and external component size.
Minimum input-to-output voltage ratios are improved by allowing the switch to stay on through multiple clock cycles, only switching off when the boost capacitor needs recharging, resulting in ~95% maximum duty cycle.
Each output can be independently disabled using its own soft-start pin, or by using the SHDN pin the entire part can be placed in a low quiescent current shutdown mode.
The LT3501 is available in a 20-lead TSSOP package with exposed leadframe for low thermal resistance.
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- 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
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Demo BoardsLinear 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.
|DC964A||LT3501EFE Demo Board | Dual, 4.5V ≤ VIN ≤ 24V, Vout1 = 3.3V @ 3A, Vout2 = 1.8V @ 3A||$225.00|
Designed for Automotive and Transportation ApplicationsAEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
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