LT3507

PRODUCTION

Triple Monolithic Step-Down Regulator with LDO

Part Models: 6
1ku List Price: Starting From $5.07

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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

Part Models: 6
1ku List Price: Starting From $5.07

Documentation

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)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3507EUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3507HUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3507HUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3507IUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3507IUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Circuit Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
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
Protection Switches & Controllers 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice 1

LT3507 Demo Circuit - Triple Monolithic Step-down Regulator with LDO (12V to 1.8V @ 2.4A, 3.3V @ 1.5A, 5V @ 1.3A & 2.5V @ 0.2A)

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

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Product Details

Demo circuit 1161B is a triple monolithic step-down regulator with LDO featuring LT3507. The demo circuit is designed for 1.8V, 3.3V, 5.0V and 2.5V outputs from a 7V to 36V input. The current capability of each channel is 2.4A, 1.3A, 1.4A and 0.2A respectively. Independent input voltage, feedback, soft-start and power good pins for each channel simplify complex power supply tracking/sequencing requirements.

All three converters are either synchronized to a common external clock input or single-resistor programmable from 250kHz to 2.5MHz using internal oscillator. At all frequencies, a 180° phase shift between V_OUT1 and the other two outputs is maintained, reducing input voltage ripple and component size. Programmable frequency allows for optimization between efficiency and external component size.

Resources

DC1161B - Design Files
6/13/2012

DC1161B - Schematic
6/13/2012

DC1161B - Demo Manual
5/10/2011

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LT3507

Overview

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Technical Articles 1

Solutions Bulletin & Brochure 1