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reference designLTC3649

Analog Devices LTC3649

60V, 4A Synchronous Step-Down Regulator with Rail-to-Rail Programmable Output

Overview

TopologyBuck Converter
Input voltage12 V
Switching frequency920-1080 kHz
Output 15 V / 8 A
IC revisionA

Description

The LTC®3649 is a high efficiency 60V, 4A synchronous monolithic step-down regulator. The regulator features a single resistor programmable output voltage, internal compensation and high efficiencies over a wide VOUT range.

The step-down regulator operates from an input voltage range of 3.1V to 60V and provides an adjustable rail-to-rail output range from (VIN – 0.5V) to ground while delivering up to 4A of output current. The switching frequency is also adjusted with an external resistor. A user-selectable mode input is provided to allow the user to trade off ripple noise for efficiency at light loads; Burst Mode operation provides the highest efficiency at light loads, while forced continuous mode provides low output ripple. The MODE/ SYNC pin can also be used to allow the user to synchronize the switching frequency to an external clock.

The LTC3649 operates with a peak current mode architecture that allows for fast transient response with inherent cycle-to-cycle current limit protection. It also features programmable output current limit, current monitoring and input voltage regulation.

Features

  • Wide VIN Range: 3.1V to 60V
  • Wide VOUT Range: 0V to (VIN – 0.5V)
  • Single Resistor VOUT Programming
  • Integrated 110mΩ Top N-Channel/50mΩ Bottom N-Channel MOSFETs
  • 95% Efficiency with 12VIN and 5VOUT
  • Regulated IQ: 440μA, Shutdown IQ: 15μA
  • Accurate Current Monitoring (±4%) without Sense Resistor
  • Accurate Resistor Programmable Frequency (300kHz to 3MHz) with ±50% Frequency Sync Range
  • Accurate Programmable Output Current
  • Input Voltage Regulation for MPPT Applications
  • ±0.8% Output Voltage Accuracy
  • Peak Current Mode Operation
  • Programmable Wire Drop Compensation
  • Burst Mode® Operation, Forced Continuous Mode
  • Internal Compensation and Programmable Soft-Start
  • Overtemperature Protection
  • Available in Thermally Enhanced 28-Lead (4mm × 5mm) QFN and TSSOP Packages

Remarks:

  • Refer page num 14 for more inductor values.

Typical applications

  • Automotive Applications
  • Industrial Applications

More information

Products

Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Material
Samples
744325330
WE-HCI SMT Flat Wire High Current Inductor, 3.3 µH, 16.6 A
Simu­lation
Downloads9 files

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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Inductance3.3 µH
Performance Rated Current16.6 A
Saturation Current @ 10%5 A
Saturation Current @ 30%15 A
DC Resistance5.9 mΩ
Self Resonant Frequency54 MHz
MaterialSuperflux