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reference designLTC3307A

Analog Devices LTC3307A

5V, 3A Synchronous Step-Down Silent Switcher in 2mm x 2mm LQFN

Overview

TopologyBuck Converter
Input voltage2.25-5.5 V
Switching frequency1000-3000 kHz
Output 13.3 V / 3 A

Description

The LTC®3307A is a very small, high efficiency, low noise, monolithic synchronous 3A step-down DC/DC converter operating from a 2.25V to 5.5V input supply. Using constant frequency, peak current mode control at switching frequencies up to 3MHz and minimum on-time as low as 22ns, this regulator achieves fast transient response with small external components. Silent Switcher architecture minimizes EMI emissions. The LTC3307A operates in forced continuous or pulse skip mode for low noise, or low-ripple Burst Mode operation for high efficiency at light loads, ideal for batterypowered systems. The IC regulates output voltages as low as 500mV. Other features include output overvoltage/ short-circuit protection, thermal shutdown, clock synchronization, and up to 100% duty cycle operation for low dropout. The device is available in a low profile 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed pad for low thermal resistance.

Features

  • High Efficiency: 8mΩ NMOS, 31mΩ PMOS
  • Programmable Frequency to 3MHz
  • Tiny Inductor and Capacitors
  • Peak Current Mode Control
  • 22ns Minimum On-Time
  • Wide Bandwidth, Fast Transient Response
  • Silent Switcher™ Architecture
  • Ultralow EMI Emissions
  • Low Ripple Burst Mode® Operation with IQ of 40μA
  • Safely Tolerates Inductor Saturation in Overload
  • VIN Range: 2.25V to 5.5V
  • VOUT Range: 0.5V to VIN
  • VOUT Accuracy: ±1% Over Temperature Range
  • Precision 400mV Enable Threshold
  • Shutdown Current: 1μA
  • Internal Compensation and Soft Start
  • Power Good Output
  • Thermally Enhanced 2mm × 2mm LQFN Package

Typical applications

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

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(A)
RDC(mΩ)
SamplesAvailability & Sample
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744040240016
SPECWE-LQS SMT Power Inductor, 0.16 µH, –
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Downloads8 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-LQS SMT Power Inductor
Inductance0.16 µH
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Self Resonant Frequency644 MHz
Rated Current3.7 A
Saturation Current7 A
DC Resistance16 mΩ
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74479276124
SPECWE-PMCI Power Molded Chip Inductor, 0.24 µH, 6.9 A
Simu­lation
Availability
–
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 Current5.4 A
–
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74479276147
SPECWE-PMCI Power Molded Chip Inductor, 0.47 µH, 5.4 A
Simu­lation
Availability
–
Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PMCI Power Molded Chip Inductor
Inductance0.47 µH
Performance Rated Current5.4 A
Saturation Current @ 10%2.95 A
Saturation Current @ 30%6.3 A
DC Resistance30 mΩ
Self Resonant Frequency165 MHz
Rated Current5.4 A
Saturation Current4.2 A
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74479287147
SPECWE-PMCI Power Molded Chip Inductor, 0.47 µH, 5.75 A
Simu­lation
Availability
–
Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PMCI Power Molded Chip Inductor
Inductance0.47 µH
Performance Rated Current5.75 A
Saturation Current @ 10%3.6 A
Saturation Current @ 30%7.4 A
DC Resistance29 mΩ
Self Resonant Frequency150 MHz
Rated Current7.35 A
Saturation Current5 A
–
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74479288147
SPECWE-PMCI Power Molded Chip Inductor, 0.47 µH, 6.8 A
Simu­lation
Availability
–
Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PMCI Power Molded Chip Inductor
Inductance0.47 µH
Performance Rated Current6.8 A
Saturation Current @ 10%3.75 A
Saturation Current @ 30%7.9 A
DC Resistance22 mΩ
Self Resonant Frequency140 MHz
Rated Current6.8 A
Saturation Current6 A
–
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