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.
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
Referenced Parts
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
| 06033D105KAT2A | AVX | CAP., X5R, 1μF, 25V, 10%, 0603 |
| 06033D224KAT2A | AVX | CAP., X5R, 0.22μF, 25V, 10%, 0603 |
| 06035C101KAT2A | AVX | CAP., X7R, 100PF, 5%, 50V, 0603 |
| 06035C102JAT2A | AVX | CAP., X5R, 1000pF, 25V, 10%, 0603 |
| 06035C103KAT2A | AVX | CAP., X7R, 0.01μF, 10%, 50V, 0603 |
| 06035C104KAT2A | AVX | CAP., X7R, 0.1μF, 50V, 10%, 0603 |
| 06035C472KAT2A | AVX | CAP., X7R, 4700PF, 10%, 50V, 0603 |
| 0603YC105KAT2A | AVX | CAP., X7R, 1μF, 16V, 10%, 0603 |
| 0603ZD475KAT2A | AVX | CAP., X5R, 4.7μF, 10V, 0603 |
| 0805YC224KAT2A | AVX | CAP., X7R, 0.22μF, 6.3V, 0805 |
| 12106D107MAT2A | AVX | CAP., X5R, 100μF, 6.3V, 1210 |
| TPSB335K025R2000 | AVX | CAP., TANT, LOW ESR, 3.3μF, 25V, 10% |
| LT1129CS8-3.3 | Analog Devices | IC, LT1129CS8-3.3, S8 PACKAGE |
| LT1129CS8-5 | Analog Devices | IC, LT1129CS8-5, S8 PACKAGE |
| LTC3880EUJ#PBF | Analog Devices | IC, LTC3880EUJ, QFN 6mm × 6mm |
| CMDSH-3TR | Central Semiconductor | DIODE, SCHOTTKY, SOD-323 |
| 575-4 | Keystone Electronics | JACK, BANANA |
| 24LC025-I/ST | Microchip | IC, 24LC025-I/ST, SOIC |
| 2308-2-00-80-00-00-07-0 | Mill-Max | TESTPOINT, TURRET, 0.062" |
| NRC06F2492TRF | NIC Components | RES., CHIP, 24.9k, 1%, 0603 |
| LN1271RTR | Panasonic | LED RED S-TYPE GULL WING SMD |
| LN1371SGTRP | Panasonic | LED GREEN S-GW TYPE SMD |
| RJK0305DPB-00-J0 | Renesas | MOSFET SPEED SRS 30V 30A LFPAK |
| RJK0330DPB-00#J0 | Renesas | MOSFET JET SERIES 30V 45A LFPAK |
| 2SN-BK-G | Samtec | SHUNT |
| TMM-103-02-L-S | Samtec | 2MM SINGLE ROW HEADER, 3 PIN |
| 6TPF330M9L | Sanyo | CAP, POSCAP, 330μF, 6.3V, 7343 |
| C1608X5R0J106M | TDK | CAP., X5R, 10μF, 6.3V, 0603 |
| C1608X7R1E224K | TDK | CAP., X7R, 0.22μF, 25V, 10%, 0603 |
| GMK316BJ106ML-T | Taiyo Yuden | CAP., X5R, 10μF, 35V, 1206 |
| GMK325BJ106KN-T | Taiyo Yuden | CAP., X5R, 10μF, 35V, 1210 |
| TMK212BJ475KG-T | Taiyo Yuden | CAP., X5R, 4.7μF, 25V, 0805 |
| CRCW06030000Z0EA | Vishay | RES., CHIP, 0Ω, 0603 |
| CRCW0603100KFKEA | Vishay | RES., CHIP, 100k, 1%, 0603 |
| CRCW0603100RFKEA | Vishay | RES., CHIP, 100Ω, 1%, 0603 |
| CRCW060310K0FKEA | Vishay | RES., CHIP, 10k, 5%, 0603 |
| CRCW0603127RFKEA | Vishay | RES., CHIP, 12Ω, 1%, 0603 |
| CRCW060316K2FKEA | Vishay | RES., CHIP, 16.2k, 1%, 0603 |
| CRCW06031K40FKEA | Vishay | RES., X5R, 1.4k, 1% ,0603 |
| CRCW08050000Z0EA | Vishay | RES., CHIP, 0Ω, 0805 |
| CRCW251230R0JNEG | Vishay | RES., CHIP, 30Ω, 1%, 1W, 2512, OPTION |
| TP0101K-T1-E3 | Vishay | MOSFET, P-CH 20V 0.58A SOT-23 |
| WSL25122L000FEA | Vishay | RES., 0.002Ω, 2512 |
| RC0603FR-070RL | Yageo | RES., CHIP, 0Ω, 0603 |
| RC0603FR-0710RL | Yageo | RES., CHIP, 10Ω, 5%, 0603 |
| RC0603FR-07200RL | Yageo | RES., CHIP, 200Ω, 1%, 0603 |
| RC0603FR-074K99L | Yageo | RES., CHIP, 4.99k, 1%, 0603 |
| 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 |
| MMBT3906LT1G | Onsemi | TRANS GP SS PNP 40V SOT-23 |
| 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 |