LT3509
PRODUCTIONDual 36V, 700mA Step-Down Regulator
- Part Models
- 10
- 1ku List Price
- Starting From $4.48
Overview
- Two 700mA Switching Regulators with Internal Power Switches
- Wide 3.6V to 36V Operating Range
- Overvoltage Lockout Protects Circuit Through 60V Supply Transients
- Short-Circuit Robust
- Low Dropout Voltage: 95% Maximum Duty Cycle
- Adjustable 300kHz to 2.2MHz Switching Frequency Synchronizable Over the Full Range
- Uses Small Inductors and Ceramic Capacitors
- Integrated Boost Diodes
- Internal Compensation
- Thermally Enhanced 14-Lead (4mm × 3mm) DFN and 16 Lead MSOP Packages
The LT3509 is a dual, current mode, step-down switching regulator, with internal power switches each capable of providing 700mA output current. This regulator provides a compact and robust solution for multi-rail systems in harsh environments. It incorporates several protection features including overvoltage lockout and cycle-by-cycle current limit. Thermal shutdown provides additional protection. The loop compensation components and the boost diodes are integrated on-chip. Switching frequency is set by a single external resistor. External synchronization is also possible. The high maximum switching frequency allows the use of small inductors and ceramic capacitors for low ripple. Constant frequency operation above the AM band avoids interference with radio reception, making the LT3509 well suited for automotive applications. Each regulator has an independent shutdown and soft-start control pin. When both converters are powered down, the common circuitry enters a low current shutdown state.
Applications
- Automotive Electronics
- Industrial Controls
- Wall Transformer Regulation
- Networking Devices
- CPU, DSP, or FPGA Power
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
Brochure 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT3509EDE#PBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LT3509EDE#TRPBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LT3509EMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3509EMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LT3509HMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3509HMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LT3509IDE#PBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LT3509IDE#TRPBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LT3509IMSE#PBF | 16-Lead MSOP w/ EP | ||
| LT3509IMSE#TRPBF | 16-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LT3509EDE#PBF | PRODUCTION | |
| LT3509EDE#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package |
||
| LT3509EMSE#PBF | PRODUCTION | |
| LT3509EMSE#TRPBF | PRODUCTION | |
| LT3509HMSE#PBF | PRODUCTION | |
| LT3509HMSE#TRPBF | PRODUCTION | |
| LT3509IMSE#PBF | PRODUCTION | |
| LT3509IMSE#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LT3509EMSE#PBF | PRODUCTION | |
| LT3509EMSE#TRPBF | PRODUCTION | |
| LT3509HMSE#PBF | PRODUCTION | |
| LT3509HMSE#TRPBF | PRODUCTION | |
| LT3509IMSE#PBF | PRODUCTION | |
| LT3509IMSE#TRPBF | PRODUCTION | |
|
Apr 18, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices |
||
| LT3509HMSE#PBF | PRODUCTION | |
| LT3509HMSE#TRPBF | PRODUCTION | |
| LT3509IMSE#PBF | PRODUCTION | |
| LT3509IMSE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
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Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3509
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
LT3509EDE Demo Board | 6.5V ≤ VIN ≤ 36V (60V Transients), VOUT1 = 5V @ 0.7A, VOUT2 = 3.3V @ 0.7A
Resources
Reference Designs
Part Used
