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reference designLTC3315B

Analog Devices LTC3315B

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

Overview

TopologyBuck Converter
Input voltage2.7 V
Switching frequency10000 kHz
Output 11.8 V / 2 A
Output 21.5 V / 2 A

Description

The LTC®3315B 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 ontime as low as 25ns, both bucks achieve high efficiency and fast transient response in a very small application footprint.

Features

  • 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
  • VIN Range: 2.25V to 5.5V
  • VOUT Range: 0.5V to VIN
  • VOUT Accuracy: }1%
  • Low Ripple Burst ModeR 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

Typical applications

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

More information

Parts approved by Analog Devices

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC max.(mΩ)
fres(MHz)
IR(A)
ISAT(mA)
RDC(mΩ)
SamplesAvailability & Sample
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74479276124
SPECWE-PMCI Power Molded Chip Inductor, 0.24 µH, 6.9 A
Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PMCI Power Molded Chip Inductor
Inductance0.24 µH
Performance Rated Current6.9 A
Saturation Current @ 10%2.8 A
Saturation Current @ 30%6.7 A
DC Resistance21 mΩ
Self Resonant Frequency280 MHz
Rated Current6.9 A
Saturation Current5400 mA
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744040240047
SPECWE-LQS SMT Power Inductor, 0.47 µH, –
Simu­lation
Availability
–
Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-LQS SMT Power Inductor
Inductance0.47 µH
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–
–
–
Self Resonant Frequency231 MHz
Rated Current2.6 A
Saturation Current5000 mA
DC Resistance32 mΩ
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