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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
L(µH)
LR(µH)
IR(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, 0.055 µH

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

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-HCM SMT High Current Flat Wire Inductor
Inductance0.055 µH
Rated Inductance0.055 µH
Rated Current27 A
Saturation Current @ 10%23.6 A
Saturation Current @ 30%25.2 A
DC Resistance0.27 mΩ
Self Resonant Frequency123 MHz
MaterialMnZn 
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