LT3505
PRODUCTION1.2A, Step-Down Switching Regulator in 3mm × 3mm DFN
- Part Models
- 8
- 1ku List Price
- Starting From $3.68
Overview
- Wide Input Range: 3.6V to 36V Operating, 40V Maximum
- Up to 1.2A Output Current
- Resistor-Programmable Fixed-Frequency Operation from 200kHz to 3MHz
- Output Adjustable Down to 780mV
- Short-Circuit Robust
- Uses Tiny Capacitors and Inductors
- Soft-Start
- Low Shutdown Current: <2µA
- Low VCESAT Switch: 350mV at 1A
- Thermally Enhanced, Low Profile 3mm x 3mm DFN-8 and MSOP-8 Packages
The LT3505 is a current mode PWM step-down DC/DC converter with an internal 1.4A power switch. The wide operating input range of 3.6V to 36V (40V maximum) makes the LT3505 ideal for regulating power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries. The oscillator can be programmed for high frequency operation allowing the use of tiny, low cost external components or it can be programmed for lower frequency operation to maximize efficiency.
Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The low current (<2µA) shutdown mode provides output disconnect, enabling easy power management in battery-powered systems.
Applications
- Automotive Battery Regulation
- Industrial Control Supplies
- Wall Transformer Regulation
- Distributed Supply Regulation
- Battery-Powered Equipment
Documentation
Data Sheet 1
User Guide 2
Technical Articles 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 |
|---|---|---|---|
| LT3505EDD#PBF | 8-Lead DFN (3mm x 3mm x 0.75mm w/ EP) | ||
| LT3505EDD#TRPBF | 8-Lead DFN (3mm x 3mm x 0.75mm w/ EP) | ||
| LT3505EMS8E#PBF | 8-Lead MSOP w/ EP | ||
| LT3505EMS8E#TRPBF | 8-Lead MSOP w/ EP | ||
| LT3505IDD#PBF | 8-Lead DFN (3mm x 3mm x 0.75mm w/ EP) | ||
| LT3505IDD#TRPBF | 8-Lead DFN (3mm x 3mm x 0.75mm w/ EP) | ||
| LT3505IMS8E#PBF | 8-Lead MSOP w/ EP | ||
| LT3505IMS8E#TRPBF | 8-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 17, 2025 - 25_0043 Change of Gold to Copper Wire and BOM (Automotive) |
||
| LT3505EDD#PBF | PRODUCTION | |
| LT3505EDD#TRPBF | PRODUCTION | |
| LT3505IDD#PBF | PRODUCTION | |
| LT3505IDD#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package |
||
| LT3505EMS8E#PBF | PRODUCTION | |
| LT3505EMS8E#TRPBF | PRODUCTION | |
|
Jul 12, 2022 - 22_0157 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM] |
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| LT3505EMS8E#PBF | PRODUCTION | |
| LT3505EMS8E#TRPBF | PRODUCTION | |
|
Jun 21, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices |
||
| LT3505EMS8E#PBF | PRODUCTION | |
| LT3505EMS8E#TRPBF | PRODUCTION | |
|
Feb 3, 2020 - 20_0128 Laser Top Mark for 8 Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LT3505EMS8E#PBF | PRODUCTION | |
| LT3505EMS8E#TRPBF | PRODUCTION | |
| LT3505IMS8E#PBF | PRODUCTION | |
| LT3505IMS8E#TRPBF | PRODUCTION | |
|
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2) |
||
| LT3505IMS8E#PBF | PRODUCTION | |
| LT3505IMS8E#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
| Parts | Product Life Cycle | Description |
|---|---|---|
| Circuit Monitors 1 | ||
| LTC2960 | RECOMMENDED FOR NEW DESIGNS | 36V Nano-Current Two-Input Voltage Monitor |
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| Ideal Diodes and PowerPath Controllers 1 | ||
| LTC4359 | RECOMMENDED FOR NEW DESIGNS | Ideal Diode Controller with Reverse Input Protection |
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2974 | RECOMMENDED FOR NEW DESIGNS | 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3505
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.
