Analog Devices DC3205A Demo Manual
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Analog Devices DC3205A Demo Manual

Analog Devices DC3205A Demo Manual

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DESCRIPTION
Demo circuit 3205A features the LTC3314A, 5V, dual 4A/
dual-phase 8A step-down DC/DC regulator IC. This demo
circuit is configured as a 2-phase, 2MHz, 3.3V input, sin-
gle 1V output, 8A buck regulator. The top switches are
180-degree out of phase to reduce the output ripple.
The
LTC
3314A
features dual monolithic synchronous
®
4A step-down power stages in a 30-ball, 2.2mm ×
2.7mm WLCSP package for space saving applications
with demanding performance requirements. Both bucks
achieve high efficiency and fast transient response with
small external components. The LTC3314A can also be
configured as a dual output, 4A per output, step-down
converter. Please refer to DC3204A as a dual output
application example. The LTC3314A data sheet gives
a complete description of its operation and application
information. The data sheet must be read in conjunction
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
/V
EMI
DC3205A Input Voltage Range
IN
IN
V
DC3205A Output Voltage Range
OUT
I
DC3205A Output Current (Each Output)
OUT
f
Switching Frequency
SW
EFF
Efficiency
DEMO MANUAL DC3205A
3.3V to 1V 8A, 2MHz Dual-Phase Low
Ripple Step-Down DC/DC Regulator
with this demo manual when evaluating or modifying this
demo circuit.
DC3205A supports three operation modes, including
pulse-skipping, forced continuous and Burst Mode
operation. The clock frequency and the operation mode
are shared by both regulators. User can select desired
operation mode with JP1 jumper. Setting JP1 to FC/SYNC
position also allows the LTC3314A to sync to a clock fre-
quency from 1MHz to 3MHz, operating in forced continu-
ous mode.
An EMI filter is included in this demo circuit for noise
sensitive applications. To power with EMI filter, please
apply input voltage via VIN EMI terminal.
Design files for this circuit board are
All registered trademarks and trademarks are the property of their respective owners.
Specifications are at T
CONDITIONS
V
= 3.3V, I
IN
OUT
= 25°C
A
MIN
2.25
0.98
= 4A
LTC3314A
available.
TYP
MAX
UNITS
5.5
1
1.02
8
1.8
2.2
91
®
V
V
A
MHz
%
Rev. 0
1

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Summary of Contents for Analog Devices DC3205A

  • Page 1 8A step-down DC/DC regulator IC. This demo demo circuit. circuit is configured as a 2-phase, 2MHz, 3.3V input, sin- DC3205A supports three operation modes, including gle 1V output, 8A buck regulator. The top switches are pulse-skipping, forced continuous and Burst Mode ®...

  • Page 2: Board Photo

    DEMO MANUAL DC3205A BOARD PHOTO Part marking is either ink mark or laser mark Figure 1. DC3205A Demo Board Rev. 0...

  • Page 3: Quick Start Procedure

    DEMO MANUAL DC3205A QUICK START PROCEDURE Refer to Figure 2 for the proper measurement equipment 5. If other operation modes are desired. Turn off PS1, set setup and follow the procedure below: LD1 to 0A and set JP1 to FC/SYNC or BURST posi- tion.

  • Page 4: Test Setup

    DEMO MANUAL DC3205A TEST SETUP 3.3V Figure 2. Test Setup for DC3205A Demo Board Figure 3. Technique for Measuring Output Ripple and Figure 4. Technique for Measuring Output Ripple and Step Step Response Response with a Low Inductance Connector (Not Supplied) Rev. 0...

  • Page 5: Theory Of Operation

    If the EN1 pin is low, the DC3205A is in shutdown and in degrees. The 0dB crossover frequency should be less a low quiescent current state. When the EN1 pin is above the 1/6 of the operating frequency to reduce the effects its threshold, the DC3205A will be enabled.
  • Page 6 DEMO MANUAL DC3205A TYPICAL PERFORMANCE CHARACTERISTICS BST1 2.25V TO 220nF 5.5V 220nH 22µF 1µF LTC3314A 10nF 100k 47µF 22µF 22µF 1µF 100k BST2 220nF 220nH 47µF 22µF 249k 1µF 100k PGOOD1 MODE/SYNC PGOOD2 AGND PGND DC3205A F05 Figure 5. LTC3314A 2-Phase 2MHz 8A Buck Typical Application Schematic...

  • Page 7: Typical Performance Characteristics

    DEMO MANUAL DC3205A TYPICAL PERFORMANCE CHARACTERISTICS Load Transient Response, Load Transient Response, Pulse-Skipping Mode Burst Mode Operation LOAD LOAD 5A/DIV 5A/DIV 5A/DIV 5A/DIV 5A/DIV 5A/DIV 50mV/DIV 50mV/DIV DC3205A F08 DC3205A F09 10µs/DIV 10µs/DIV LOAD STEP: 0.1A TO 6A IN 1µs LOAD STEP: 0.1A TO 6A IN 1µs...

  • Page 8: Parts List

    DEMO MANUAL DC3205A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C1, C7, C9, C18 CAP ., 1µF, X7T, 6.3V, 20%, 0201 MURATA, GRM033D70J105ME01D C2, C21 CAP ., 0.22µF, X7R, 16V, 10%, 0402, AEC-Q200 MURATA, GCM155R71C224KE02D C5, C12, C17, C22 CAP ., 22µF, X5R, 10V, 20%, 0603...

  • Page 9: Schematic Diagram

    Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
  • Page 10 Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY.

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