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LTC3880 Dual Output Step-Down DC/DC Controller Demo Manual

Dual output synchronous buck converter demonstration circuit for the LTC3880, providing 20A per channel with digital power management and PMBus telemetry.

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Overview

Demonstration circuit 1590B is a dual-output synchronous buck converter featuring the LTC3880, a peak current mode controller with digital power system management. The board is available in two versions: DC1590B-A, which uses sense resistors for current sensing at a 350kHz switching frequency, and DC1590B-B, which utilizes inductor DCR sensing at 425kHz. It supports an input voltage range of 6.5V to 24V and delivers two programmable outputs of 20A each, with a factory default of 1.8V. The circuit can operate via default configuration resistors or be reconfigured through the LTpowerPlay GUI using a PMBus/I2C/SMBus dongle to monitor telemetry such as voltage, current, temperature, and fault status.

Use Cases

  • Digital power system management evaluation
  • High-current buck converter prototyping
  • PMBus-controlled power supply development
  • Voltage and current telemetry monitoring
  • Step-down DC/DC converter fault logging and response testing

Topics

LTC3880
Buck Converter
Digital Power Management
PMBus
Synchronous Step-Down
DC1590B
LTpowerPlay
Telemetry
Dual Output

Referenced Parts

CMDSH-3TR

Central Semiconductor

DIODE, SCHOTTKY, SOD-323

575-4

Keystone Electronics

JACK, BANANA

LN1271RTR

Panasonic

LED RED S-TYPE GULL WING SMD

LN1271RTR

Panasonic

11 1 D5 LED RED S-TYPE GULL WING SMD PANASONIC LN1271RTR

LN1371SGTRP

Panasonic

10 2 D3, D4 LED GREEN S-GW TYPE SMD PANASONIC LN1371SGTRP

RJK0305DPB-00-J0

Renesas

17 2 Q1, Q3 MOSFET SPEED SRS 30V 30A LFPAK RENESAS RJK0305DPB-00#J0

RJK0305DPB-00-J0

Renesas

12 2 Q15, Q16 MOSFET SPEED SRS 30V 30A LFPAK RENESAS RJK0305DPB-00#J0

RJK0330DPB-00#J0

Renesas

18 2 Q2, Q4 MOSFET JET SERIES 30V 45A LFPAK RENESAS RJK0330DPB-00#J0

TP0101K-T1-E3

Vishay

14 1 Q14 MOSFET P-CH 20V 0.58A SOT-23 VISHAY TP0101K-T1-E3

CR16-1742FM

American Alumina Corp

RES., CHIP 17.4k 1% 0603

CR16-2333FM

American Alumina Corp

RES., CHIP, 23.2k, 1%, 0603

112404

Amphenol Connex

CONN, BNC, 5 PINS

CR16-1132FM

American Alumina Corp

RES., CHIP, 11.3k, 1%, 0603

CR16-1504FM

American Alumina Corp

RES., CHIP, 1.5k, 1%, 0603

CR16-4871FM

American Alumina Corp

RES., CHIP, 4.87k, 1%, 0603

LTC3880EUJ-1

Analog Devices

version can be populated with the LTC3880EUJ-1, instead of the LTC3880EUJ

JS202011CQN

C&K Components

CONNECTOR, SUB MINIATURE SLIDE SWITCHES

98414-G06-12ULF

FCI

CONN HEADER 12POS 2MM STR DL PCB

2N7002A

Fairchild Semiconductor

MOSFET, N-CH 60V 115MA SOT-23

NMC1206X7R105K50TR

NIC Components

CAP., X7R, 1μF, 50V, 1206

4TPF330M9L

Sanyo

CAP, POSCAP, 330μF, 4V, 7343

35HVP150M

Suncon

CAP, OS-CON, 150μF, 35V

RN5326

Tepro

RES., CHIP, 0Ω, 1W, 2512

IHLP-4040-DZ-01

Vishay

INDUCTOR, 0.56μH

59PR9875

Vitec

INDUCTOR, 0.4μH

RC0603FR-072RL

Yageo

RES., CHIP, 2Ω, 1%, 0603

6mm

Analog Devices

28 1 U4 IC, LTC3880EUJ, QFN 6mm × 6mm ANALOG DEVICES, LTC3880EUJ#PBF

6mm

Analog Devices

32 1 U4 IC, LTC3880EUJ, QFN 6mm × 6mm ANALOG DEVICES, LTC3880EUJ#PBF

SOT-23

Vishay

15 1 Q14 MOSFET, P-CH 20V 0.58A SOT-23 VISHAY, TP0101K-T1-E3

SOT-23

Vishay

14 1 Q14 MOSFET P-CH 20V 0.58A SOT-23 VISHAY TP0101K-T1-E3