LT3507
PRODUCTIONTriple Monolithic Step-Down Regulator with LDO
- Part Models
- 6
- 1ku List Price
- Starting From $6.42
Overview
- Wide Input Range: 4V to 36V
- One 2.4A and Two 1.5A Output Switching Regulators with Internal Power Switches
- Low Dropout Linear Regulator with External Transistor
- Antiphase Switching Reduces Ripple
- Independent Run, Tracking/Soft-Start, and Power Good Indicators Ease Supply Sequencing
- Uses Small Inductors and Ceramic Capacitors
- Adjustable, 250kHz to 2.5MHz Switching Frequency, Synchronizable Over the Full Range
- User Programmable Overvoltage and Undervoltage Lockouts
- Thermally Enhanced, 38-Lead 5mm × 7mm QFN Package
The LT3507 is a triple, current mode, DC/DC converter with internal power switches and a low dropout regulator. The switching converters are step-down converters capable of generating one 2.4A output and two 1.5A outputs. All three converters are synchronized to a single oscillator. The 2.4A output runs with opposite phase to the other two converters, reducing input ripple current. Each regulator has independent shutdown and soft-start circuits, and generates a power good signal when its output is in regulation, easing power supply sequencing and interfacing with microcontrollers and DSPs.
The switching frequency is set with a single resistor yielding a range of 250kHz to 2.5MHz. The high switching frequency allows the use of small inductors and capacitors resulting in a very small triple output supply. The constant switching frequency, combined with low impedance ceramic capacitors, results in low, predictable output ripple. With its wide input voltage range of 4V to 36V, the LT3507 regulates a broad array of power sources including 5V logic rails, unregulated wall transformers, lead acid batteries and distributed power supplies.
| Output Current | Package | |
| LT3507 | 2.5A, 1.5A, 1.5A | 5 × 7 QFN-38 |
| LT3507A | 2.7A, 1.8A, 1.8A | 5 × 7 QFN-38, TSSOP-38E |
Applications
- DSL and Cable Modems
- Distributed Power Regulation
- DSP Power
- Automotive
Documentation
Data Sheet 1
User Guide 1
Design Note 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 |
|---|---|---|---|
| LT3507EUHF#PBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LT3507EUHF#TRPBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LT3507HUHF#PBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LT3507HUHF#TRPBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LT3507IUHF#PBF | 38-Lead QFN (5mm x 7mm w/ EP) | ||
| LT3507IUHF#TRPBF | 38-Lead QFN (5mm x 7mm w/ EP) |
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 |
| Oscillators 1 | ||
| LTC6909 | PRODUCTION | 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation |
| 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:
- LT3507
- LT3507A
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
LT3507EUHF Demo Board | 7V to 36VIN, VOUT1 = 1.8V @ 2.4A, VOUT2 = 3.3V @ 1.3A, VOUT3 = 5.0V @ 1.4A, VOUT4 = 2.5V @ 0.2A