LTC3605A

PRODUCTION

20V, 5A Synchronous Step-Down Regulator

Part Models: 4
1ku List Price: Starting From $5.07

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Part Details

High Efficiency: Up to 96%
5A Output Current
4V to 20V V_IN Range
Integrated Power N-Channel MOSFETs (70mΩ Top and 35mΩ Bottom)
Adjustable Frequency 800kHz to 4MHz
PolyPhase^® Operation (Up to 12 Phases)
Output Tracking
0.6V ±1% Reference Accuracy
Current Mode Operation for Excellent Line and Load Transient Response
Shutdown Mode Draws Less Than 15μA Supply Current
LTC3605: 15V Absolute Maximum V_IN
LTC3605A: 22V Absolute Maximum V_IN
The LTC3605A Is Pin Compatible with the LTC3605
Available in 24-Pin (4mm × 4mm) QFN Package

The LTC3605A is a high efficiency, monolithic synchronous buck regulator using a phase lockable controlled on-time constant frequency, current mode architecture. PolyPhase operation allows multiple LTC3605A regulators to run out of phase while using minimal input and output capacitance. The operating supply voltage range is from 20V down to 4V, making it suitable for dual, triple or quadruple lithium-ion battery inputs as well as point of load power supply applications from a 12V or 5V rail.

The operating frequency is programmable from 800kHz to 4MHz with an external resistor. The high frequency capability allows the use of small surface mount inductors. For switching noise sensitive applications, it can be externally synchronized from 800kHz to 4MHz. The PHMODE pin allows user control of the phase of the outgoing clock signal. The unique constant frequency/controlled on-time architecture is ideal for high step-down ratio applications that are operating at high frequency while demanding fast transient response. Two internal phase-lock loops synchronize the internal oscillator to the external clock and also servos the regulator on-time to lock on to either the internal clock or the external clock if it’s present.


	Input Voltage Range
LTC3605	4V to 15V
LTC3605A	4V to 20V

Applications

Point of Load Power Supply
Portable Instruments
Distributed Power Systems
Battery-Powered Equipment

Part Models: 4
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
LTC3605AEUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3605AEUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3605AIUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3605AIUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Silicon Oscillators 1
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LTC3605
LTC3605A

LTpowerCAD 1

LTC3605A Project - 5A, 20V Monolithic Buck Regulator (4-20V to 2.5V @ 5A)

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.

LTpowerCAD^® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

LTC3605A Demo Board | 4V to 20V Input, VOUT = 2.5V/3.3V/5V/Adj at 5A

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Product Details

Demonstration circuit 1897 is a step-down converter, using the LTC3605A monolithic synchronous buck regulator. The DC1897B has a maximum input voltage of 20V, and is capable of delivering up to 5A of output current at a minimum input voltage of 4V. The output voltage of the DC1897B can be set as low as 0.6V, the reference voltage of the LTC3605A. It has a jumper that allows the output to be set at 2.5V, 3.3V or 5V. The LTC3605A has a phase-lock-loop circuit, allowing high current multiphase operation of several DC1897Bs in parallel.

Resources

DC1897B - Demo Manual
614.00K

DC1897B - Schematic
50.00K

DC1897B - Design Files
2.00M

Reference Designs

View Detailed Reference Design

Features and Benefits

Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
Our reference designs are supported by an intuitive design tool set and IP
Our team can provide designs for quick prototypes that can speed time to market in the most complex applications

Part Used

LTC3600

LTC3605A

LT8612

LT3021
LT3021-1.2
LT3021-1.5
LT3021-1.8

Monolithic Power Tree Solution for the ZU7 FPGA

Zynq UltraScale+ MPSoC ZCU104 Paper Reference Design

View Detailed Reference Design

Features and Benefits

The ZCU104 Evaluation Kit enables designers to jumpstart designs for embedded vision applications such as surveillance, Advanced Driver Assisted Systems (ADAS), machine vision, Augmented Reality (AR), drones and medical imaging.

The ADI Power delivery solutions support multiple reference designs using DC/DC module and monolithic solutions. ADI offers several options for powering the Zu7 FPGA.

Our module-based solutions combine a small footprint, while maximizing efficiency and tight regulation. Our monolithic based solutions support a lower cost optimized power delivery solution for mass production.