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reference designLTC3872

Analog Devices LTC3872

No RSENSE Current Mode Boost DC/DC Controller

Overview

TopologyBoost Converter
Input voltage5 V
Switching frequency500-650 kHz
Output 124 V / 1 A
IC revisionC

Description

The LTC®3872 is a constant frequency current mode boost DC/DC controller that drives an N-channel power MOSFET and requires very few external components. The No RSENSE TM architecture eliminates the need for a senseresistor, improves efficiency and saves board space.

The LTC3872 provides excellent AC and DC load and line regulation with ±1.5% output voltage accuracy. It incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2.3V.

High switching frequency of 550kHz allows the use of small inductor. The LTC3872 is available in an 8-lead low profile (1mm) ThinSOTTM package and 8-pin 2mm × 3mm DFN package.

Features

  • No Current Sense Resistor Required
  • VOUT up to 60V
  • Constant Frequency 550kHz Operation
  • Internal Soft-Start and Optional External Soft-Start
  • Adjustable Current Limit
  • Pulse Skipping at Light Load
  • VIN Range: 2.75V to 9.8V
  • ±1.5% Voltage Reference Accuracy
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Low Profile (1mm) SOT-23 and 2mm × 3mm DFN Packages

Typical applications

  • IP Phone Power Supplies
  • Telecom Power Supplies
  • 42V Automotive Systems
  • 24V Industrial Controls

More information

Products

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Data­sheet
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Status
Product series
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Material
Qty.
SamplesAvailability & Sample
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7443550820
SPECWE-HCI SMT Flat Wire High Current Inductor, 8.2 µH, 12.5 A
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Inductance8.2 µH
Performance Rated Current12.5 A
Saturation Current @ 10%5 A
Saturation Current @ 30%11 A
DC Resistance11.6 mΩ
Self Resonant Frequency20 MHz
MaterialWE-PERM 
Packaging Unit400 
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