LTC3315B

RECOMMENDED FOR NEW DESIGNS

Dual 5V, 2A Synchronous Step-Down DC/DCs in 2mm × 2mm LQFN

Data Sheet (Rev. 0) Product Selection Table

Part Models: 18
1ku List Price: Starting From $2.12

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Overview

Dual Outputs Each with 2A Output Current
High Efficiency: 19mΩ NMOS and 75mΩ PMOS
Wide Bandwidth, Fast Transient Response
Switching Frequency Synchronizable Up to 10MHz
V_IN Range: 2.25V to 5.5V
V_OUT Range: 0.5V to V_IN
V_OUT Accuracy: ±1%
Low Ripple Burst Mode^® Operation
Peak Current Mode Control

Minimum On-Time: 25ns
Safely Tolerates Inductor Saturation in Overload
Shutdown Current: 1.2µA
Precision 400mV Enable Thresholds
Internal Soft-Start and Compensation
Power Good Output
Low Profile, Thermally Enhanced 12-Lead
2mm × 2mm × 0.74mm LQFN Package
AEC-Q100 Qualified for Automotive Applications

The LTC3315B features dual 2A monolithic synchronous step-down converters operating from a 2.25V to 5.5V input supply in one package for space-constrained applications with demanding performance requirements. Using constant frequency, peak current mode control at switching frequencies up to 10MHz with a minimum on-time as low as 25ns, both bucks achieve high efficiency and fast transient response in a very small application footprint.

The LTC3315B operates in forced continuous or pulse skip mode for low noise or in Burst Mode^® operation for high efficiency at light loads. The common buck switching frequency is 6MHz and can be synchronized to an external oscillator via the MODE/SYNC pin.

The LTC3315B can regulate outputs as low as 500mV. Other features include precision enable thresholds, a PGOOD signal, output overvoltage protection, thermal shutdown, output short-circuit protection, and up to 100% duty cycle operation for low dropout. The LTC3315B is available in a compact 2mm × 2mm LQFN package.

Applications

Servers, Telecom Supplies, Optical Networking
Distributed DC Power Systems (POL)
FPGA, ASIC, µP Core Supplies
Industrial/Automotive/Communications

Part Models: 18
1ku List Price: Starting From $2.12

Documentation

Data Sheet 1

LTC3315B: Dual 5V, 2A Synchronous Step-Down DC/DCs in 2mm × 2mm LQFN Preliminary Datasheet (Rev.0) 04/09/2020

Reliability Data 1

R523 Reliability Data 03/24/2021

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
LTC3315BEV#TRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BEV#TRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BEV#WTRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BEV#WTRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BHV#TRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BHV#TRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BHV#WTRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BHV#WTRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BIV#TRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BIV#TRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BIV#WTRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BIV#WTRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BJV#TRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BJV#TRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BJV#WTRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BJV#WTRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BMPV#TRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3315BMPV#TRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	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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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3315A
LTC3315B

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

LTC3315A
LTC3315B

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

3.3V VIN, Dual 2A, 6MHz Synchronous Step-Down Regulators at 1.8V and 2.0V Outputs, in a 0.71cm2 Solution

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Product Details

Demonstration Circuit DC2748A features the LTC3315B dual 5V, 2A Synchronous Step-Down DC/DC regulators operating at 6MHz. One regulator provides a 1.8V output and the other provides 2.0V, both up to a 2A load. The LTC3315B supports adjustable output voltages from 0.5V to V_IN, operating frequencies from 3MHz up to 10MHz. The LTC3315B is a compact, high efficiency, and high speed synchronous monolithic step-down switching regulator. Fast minimum on-time of 25ns enables high V_IN to low V_OUT conversion at high frequency.

The DC2748A operating mode may be selected as Burst Mode operation, Skip mode or Forced Continuous (FC) mode. Setting JP1 to the FC/SYNC position will allow the LTC3315B to sync to a clock frequency from 3MHz to 10MHz. The LTC3315B operates in Forced Continuous mode when syncing to an external clock.

The LTC3315B data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with the demo manual. The LTC3315B is assembled in a 2mm × 2mm LQFN package with exposed pads for low thermal resistance. The PCB Considerations section in the data sheet.

The Efficiency vs Load graph on the demo manual shows the efficiency and the power loss of the circuit with a 3.3V input in Burst Mode operation.

Resources

DC2748A - Schematic
9/25/2020

DC2748A - Demo Manual (Rev.0)
9/25/2020

DC2748A - Design Files
9/25/2020

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