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reference designLTC3877/LTC3874 | Demoboard DC2229A-B

Analog Devices LTC3877/LTC3874 | Demoboard DC2229A-B

DC2229A-B - LTC3877/LTC3874 Demo Board | 4-Phase Buck Controller with VID Inputs,Sub-mΩ DCR sensing, 6V ≤ VIN ≤ 14V, Vout = 0.6V to 1.23V at 120A

Overview

TopologyBuck Converter
Input voltage6-14 V
Output 11.23 V / 120 A
IC revision2

Description

Demonstration circuits 2229A-A and 2229A-B feature the LTC®3877 in two high output current, high efficiency, VID programmed step-down converters with sub-mΩ DCR sensing. For both converters, the input voltage range is6V to 14V and the switching frequency is 400kHz.The DC2229A-A provides two outputs. VOUT1 is VID programmable from 0.6V to 1.23V and VOUT2 is set for 1.5V. Both rails have a maximum load current of 30A. The DC2229A-B assembly is a four phase converter providinga VID programmable output of 0.6V to 1.23V with a maximum load current of 120A. Phases 1 and 2 are controlled by the LTC3877 and phases 3 and 4 are controlled by the LTC3874 slave controller.The demo board uses 0.25μH inductors with a DCR value of 0.325mΩ. The LTC3877 and LTC3874 employ a proprietary sub-mΩ DCR sensing architecture which enhances the signal to provide accurate control of the inductor current. The low DCR inductors, along with the use of low Qg/lowRDS(ON) discrete FETs and strong gate drivers provides high efficiency for high output current supplies. The full load efficiency is 90.3%, as seen on the 1.5V rail of the LTC3877 dual output converter (DC2229A-A assembly)with an input voltage of 12V.Additional features of this demo board include:

  • Remote sensing
  • PLLIN and CLKOUT pins
  • PGOOD, RUN and TK/SS pins
  • Optional resistors to tie two or more phases together
  • Optional footprints for BSG0811 dual channel MOSFETs
  • Optional NTC network on the ITEMP pin of the LTC3877 for less current limit variation over temperature n Dynamic load circuit.The demo board uses a high density, two-sided drop-in layout. The core components for each dual phase section consists of MOSFETs, inductors, ceramic CIN, ceramic COUT on the top layer and the control circuit on the bottom, resides in a 1.3" x 1.3" area of the board.The LTC3877 and LTC3874 data sheets provide a complete description of the IC operation and application information. These data sheets must be read in conjunction with the quick start guide.

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L(nH)
LR(nH)
IR(A)
ISAT,10%(A)
ISAT,30%(A)
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744301025
SPECWE-HCM SMT High Current Flat Wire Inductor, 250 nH, 250 nH

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.

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Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-HCM SMT High Current Flat Wire Inductor
Inductance250 nH
Rated Inductance250 nH
Rated Current38 A
Saturation Current @ 10%54.4 A
Saturation Current @ 30%64.7 A
DC Resistance0.32 mΩ
Self Resonant Frequency33 MHz
MaterialMnZn 
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