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reference designLTC3311

Analog Devices LTC3311

5V, 12.5A Synchronous Step-Down Silent Switcher in 3mm x 3mm LQFN

Overview

TopologyBuck Converter
Input voltage3-4.3 V
Output 10.5 V / 12.5 A

Description

The LTC®3311 is a very small, low noise, monolithicstep-down DC/DC converter capable of providing up to12.5A of output current from a 2.25V to 5.5V input supply.The device employs Silent Switcher 1 architecture withinternal hot loop bypass capacitors to achieve both lowEMI and high efficiency at switching frequencies as highas 5MHz. For systems with higher power requirements,multi-phasing parallel converters is readily implemented.

Features

  • Pin Compatible with LTC3310/LTC3310S and LTC3311S
  • Silent Switcher® Architecture:
  • Ultralow EMI Emissions
  • High Efficiency—4.5mΩ NMOS and 16mΩ PMOS
  • Wide Bandwidth, Fast Transient Response
  • Safely Tolerates Inductor Saturation in Overload
  • VIN Range: 2.25V to 5.5V
  • VOUT Range: 0.5V to VIN
  • VOUT Accuracy: ±1% with Remote Sense
  • Peak Current Mode Control
  • Minimum On-Time: 35ns
  • Programmable Frequency to 5MHz
  • Precision 400mV Enable Threshold, 1μA in Shutdown
  • Output Soft-Start with Voltage Tracking
  • Power Good Output
  • Die Temperature Monitor
  • Configurable for Paralleling Power Stages in ForcedContinuous Mode
  • Thermally-Enhanced 3mm × 3mm LQFN Package
  • AEC-Q100 Qualified for Automotive Applications

Typical applications

  • Servers, Telecom Power Supplies, Distributed DC Power Systems (POL)
  • Automotive/Industrial/Communications

More information

Parts approved by Analog Devices

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Order Code
Data­sheet
Simu­lation
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Status
Product series
LR(µH)
VOP(V)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Material
SamplesAvailability & Sample
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744340300055
SPECWE-HCM SMT High Current Flat Wire Inductor, 0.055 µH, 80 V
Simu­lation
Availability
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Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-HCM SMT High Current Flat Wire Inductor
Rated Inductance0.055 µH
Operating Voltage80 V
Performance Rated Current53 A
Saturation Current @ 10%24 A
Saturation Current @ 30%27 A
DC Resistance0.27 mΩ
Self Resonant Frequency123 MHz
MaterialMnZn 
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