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reference designLTC3838EUHF | Demoboard DC1801A-A

Analog Devices LTC3838EUHF | Demoboard DC1801A-A

LTC3838EUHF High Efficiency Dual Output Step-Down DC/DC Converter

Overview

TopologyBuck Converter
Input voltage4.5-14 V
Output 11.5 V / 20 A
Output 21.2 V / 20 A
IC revision1

Description

Demonstration circuit 1801A is a dual output 1.5V/20A and 1.2V/20A synchronous buck converter operating with a switching frequency of 300kHz over an input voltage range of 4.5V to 14V. The demo board comes in two versions. The A version uses inductor DCR current sensing for highefficiency. The B version uses 2mΩ sense resistor for accurate current sensing with a low DCR ferrite inductor. The fixed on-time valley current mode topology of the LTC3838 allows for a fast load step response (see Figures 6 to 9). The load step response can be tested with the onboardload step circuit and a bench pulse generator.The demo board uses a high density, two sided drop in layout. The entire converter, excluding the bulk output and input capacitors, fits within a compact 1.5” × 1.0” area on the board. The package style for the LTC3838EUHF is a 38-pin QFN with an exposed ground pad.

Features

    • MODE jumper to program either discontinuous mode (DCM) or forced continuous mode (FCM) at light or no load.
    • EXTVCC pin.
    • PLLIN pin to synchronize the converter to an external
  • clock.
    • Remote sensing for VOUT1.
    • Optional resistors to tie the two phases together.
    • Each rail has its own RUN pin, PGOOD pin and
  • TRACK/SS pin.

More information

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Data­sheet
Simu­lation
Downloads
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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744355047
SPECWE-HCI SMT Flat Wire High Current Inductor, 0.47 µH, 50.1 A
Simu­lation
Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Inductance0.47 µH
Performance Rated Current50.1 A
Saturation Current @ 10%24 A
Saturation Current @ 30%50 A
DC Resistance0.9 mΩ
Self Resonant Frequency95 MHz
MaterialWE-PERM 
Packaging Unit400 
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