Design DocumentAnalog
Demo Manual DC1640A: LTC3833EUDC High Efficiency Step-Down DC/DC Converter
Demo manual for DC1640A featuring the LTC3833EUDC buck converter. Provides 1.5V/20A output from a 4.5V-14V input with high efficiency and fast load step response.
Overview
Demonstration circuit 1640A is a synchronous buck converter designed to evaluate the LTC3833EUDC. It delivers a 1.5V output at up to 20A from an input voltage range of 4.5V to 14V. The circuit operates at a switching frequency of 300kHz and features two configuration versions: the A version uses inductor DCR current sensing for high efficiency (89.4%), while the B version employs a 2mΩ sense resistor for higher current sensing accuracy. The LTC3833 utilizes a fixed on-time valley current mode topology to achieve fast transient response. The board includes features such as selectable DCM or CCM operation, PLLIN for external clock synchronization, and a compact converter layout measuring 1.4" x 0.6".
Use Cases
- Point-of-load regulation
- High current power distribution
- Computing and server power supplies
- Networking infrastructure
- Distributed power systems
Topics
LTC3833EUDC
DC1640A
Step-Down Converter
Buck Converter
DCR Sensing
Synchronous Rectification
High Efficiency
Fast Load Step Response
20A DC/DC Converter
Valley Current Mode
Referenced Parts
LRC-LRF2010LF-01-R010-G
IRC
Res 0.01 2% 2010
575-4
Keystone
Jack Banana
8833
Keystone
Stand-Off Nylon 0.50” (Snap-On)
LTC3833EUDC#PBF
Linear Technology
IC LTC3833EUDC
RN5326
Tepro
Res 0.000 2512 (DCR Sense Version)
DPAK-TO252AA
Vishay
6 1 Q5 MOSFET N-CH 30-V (D-S) DPAK-TO252AA Vishay SUD50N03-12P-E3
| 06035A101JAT2A | AVX | Cap C0G 100pF 50V 5% 0603 |
| 06035A471KAT2A | AVX | Cap C0G 470pF 50V 10% 0603 |
| 06035C102JAT2A | AVX | Cap X7R 1000pF 50V 5% 0603 |
| 0603YC103KAT2A | AVX | Cap X7R 0.01μF 16V 10% 0603 |
| 0603YC104KAT2A | AVX | Cap X7R 0.1μF 16V 10% 0603 |
| 0603YC224KAT2A | AVX | Cap X7R 0.22μF 16V 10% 0603 |
| 0805YD475KAT2A | AVX | Cap X5R 4.7μF 16V 10% 0805 |
| CMDSH-3TR | Central Semiconductor | Diode Schottky 30V SOD323 |
| 2501-2-00-80-00-00-07-0 | Mill-Max | Testpoint Turret .094” |
| GRM31CR60J107ME39L | Murata | Cap X5R 100μF 6.3V 20% 1206 |
| GRM32ER61C226KE20L | Murata | Cap X5R 22μF 16V 10% 1210 |
| RJK0305DPB | Renesas | MOSFET Power N-CH LFPAK |
| RJK0330DPB | Renesas | MOSFET Power N-CH LFPAK |
| 2SN-BK-G | Samtec | Shunt 2MM Center |
| TMM-103-02-L-S | Samtec | Header 2MM Single Row 3 Pin |
| 16SVP180MX | Sanyo | Cap SVP 180μF 16V 30mΩ ESR |
| 2R5TPE330M9 | Sanyo | Cap POSCAP 330μF 2.5V 20% 7343 |
| SUD50N03-12P-E3 | Vishay | MOSFET N-CH 30-V (D-S) DPAK-TO252AA |
| WSL25122L000FEA | Vishay | Res Chip 0.002Ω 1W 1% 2512 (RSENSE Version) |
| RC0603FR-070RL | Yageo | Res 0 1/16W 0603 |
| RC0603FR-0710KL | Yageo | Res 10k 1/16W 1% 0603 |
| RC0603FR-0710RL | Yageo | Res Chip 10 1/10W 1% 0603 |
| RC0603FR-07137KL | Yageo | Res 137k 1/16W 1% 0603 |
| RC0603FR-0713KL | Yageo | Res 13k 1/16W 1% 0603 (DCR Sense Version) |
| RC0603FR-0715KL | Yageo | Res 15k 1/10W 1% 0603 |
| RC0603FR-0716K5L | Yageo | Res Chip 16.5k 1/16W 1% 0603 (RSENSE Version) |
| RC0603FR-072K15L | Yageo | Res 2.15k 1/16W 1% 0603 |
| RC0603JR-07100KL | Yageo | Res 100k 1/16W 5% 0603 |
| RC0603JR-0710RL | Yageo | Res 10 1/16W 5% 0603 |
| RC0603JR-072R2L | Yageo | Res 2.2 1/16W 5% 0603 |
| 06035A101JAT2A | AVX | 4 1 C5 Cap C0G 100pF 50V 5% 0603 AVX 06035A101JAT2A |
| 06035A471KAT2A | AVX | 5 1 C6 Cap C0G 470pF 50V 10% 0603 AVX 06035A471KAT2A |
| 06035C102JAT2A | AVX | 1 1 C1 Cap X7R 1000pF 50V 5% 0603 AVX 06035C102JAT2A |
| 0603YC103KAT2A | AVX | 3 1 C4 Cap X7R 0.01μF 16V 10% 0603 AVX 0603YC103KAT2A |
| 0603YC104KAT2A | AVX | 2 2 C3, C9 Cap X7R 0.1μF 16V 10% 0603 AVX 0603YC104KAT2A |
| 0603YC224KAT2A | AVX | 1 1 C1 Cap X7R 0.22μF 16V 10% 0603 AVX 0603YC224KAT2A |
| 0805YD475KAT2A | AVX | 6 1 C7 Cap X5R 4.7μF 16V 10% 0805 AVX 0805YD475KAT2A |
| GRM31CR60J107ME39L | Murata | 9 2 COUT1, COUT2 Cap X5R 100μF 6.3V 20% 1206 Murata GRM31CR60J107ME39L |
| GRM32ER61C226KE20L | Murata | 7 3 CIN1, CIN2, CIN6 Cap X5R 22μF16V 10% 1210 Murata GRM32ER61C226KE20L |
| RJK0305DPB | Renesas | 13 1 Q1 MOSFET Power N-CH LFPAK Renesas RJK0305DPB |
| RJK0305DPB | Renesas | QTOP = RENESAS RJK0305DPB |
| RJK0330DPB | Renesas | Q BOTTOM = RENESAS RJK0330DPB |
| RJK0330DPB | Renesas | 14 1 Q2 MOSFET Power N-CH LFPAK Renesas RJK0330DPB |
| 2SN-BK-G | Samtec | 4 2 JP1, JP2 Shunt 2MM Center Samtec 2SN-BK-G |
| TMM-103-02-L-S | Samtec | 5 2 JP1, JP2 Header 2MM Single Row 3 Pin Samtec TMM-103-02-L-S |
| SUD50N03-12P-E3 | Vishay | 6 1 Q5 MOSFET N-CH 30-V (D-S) DPAK-TO252AA Vishay SUD50N03-12P-E3 |
| WSL25122L000FEA | Vishay | 0.002 Ohm 2512, VISHAY WSL25122L000FEA |
| WSL25122L000FEA | Vishay | 25 1 RS1 Res Chip 0.002Ω 1W 1% 2512 Vishay WSL25122L000FEA |
| RC0603FR-070RL | Yageo | 17 1 R14 Res Chip 0 1/16W 0603 Yageo RC0603FR-070RL |
| RC0603FR-070RL | Yageo | 23 2 R4, R9 Res Chip 0 1/16W 0603 Yageo RC0603FR-070RL |
| RC0603FR-070RL | Yageo | 17 2 R13, R17 Res 0 1/16W 0603 Yageo RC0603FR-070RL |
| RC0603FR-070RL | Yageo | 22 2 R4, R9 Res 0 1/16W 0603 Yageo RC0603FR-070RL |
| RC0603FR-0710KL | Yageo | 22 2 R21, R8 Res Chip 10k 1/16W 1% 0603 Yageo RC0603FR-0710KL |
| RC0603FR-0710KL | Yageo | 7 1 R22 Res Chip 10k 1/16W 1% 0603 Yageo RC0603FR-0710KL |
| RC0603FR-0710KL | Yageo | 21 2 R21, R8 Res 10k 1/16W 1% 0603 Yageo RC0603FR-0710KL |
| RC0603FR-0710RL | Yageo | 20 2 R2, R3 Res Chip 10 1/10W 1% 0603 Yageo RC0603FR-0710RL |
| RC0603FR-07137KL | Yageo | 19 1 R18 Res Chip 137k 1/16W 1% 0603 Yageo RC0603FR-07137KL |
| RC0603FR-07137KL | Yageo | 19 1 R18 Res 137k 1/16W 1% 0603 Yageo RC0603FR-07137KL |
| RC0603FR-0713KL | Yageo | 18 1 R15 Res 13k 1/16W 1% 0603 Yageo RC0603FR-0713KL |
| RC0603FR-0715KL | Yageo | 23 1 R6 Res 15k 1/10W 1% 0603 Yageo RC0603FR-0715KL |
| RC0603FR-0715KL | Yageo | 24 1 R6 Res Chip 15k 1/10W 1% 0603 Yageo RC0603FR-0715KL |
| RC0603FR-0716K5L | Yageo | 18 1 R15 Res Chip 16.5k 1/16W 1% 0603 Yageo RC0603FR-0716K5L |
| RC0603FR-072K15L | Yageo | 24 1 R7 Res 2.15k 1/16W 1% 0603 Yageo RC0603FR-072K15L |
| RC0603JR-07100KL | Yageo | 15 1 R1 Res 100k 1/16W 5% 0603 Yageo RC0603JR-07100KL |
| RC0603JR-07100KL | Yageo | 15 1 R1 Res Chip 100k 1/16W 5% 0603 Yageo RC0603JR-07100KL |
| RC0603JR-0710RL | Yageo | 16 2 R10, R11 Res Chip 10 1/16W 5% 0603 Yageo RC0603JR-0710RL |
| RC0603JR-0710RL | Yageo | 16 2 R10, R11 Res 10 1/16W 5% 0603 Yageo RC0603JR-0710RL |
| RC0603JR-072R2L | Yageo | 21 1 R20 Res Chip 2.2 1/16W 5% 0603 Yageo RC0603JR-072R2L |
| RC0603JR-072R2L | Yageo | 20 1 R20 Res 2.2 1/16W 5% 0603 Yageo RC0603JR-072R2L |
| 112404 | CONNEX | Conn BNC 5 Pins |
| FP1308R3-R44-R | Cooper Bussmann | Inductor 0.44μH (RSENSE Version) |
| 744355047 | Wurth Electronics | Inductor 0.47μH (DCR Sense Version) |
| LRC-LRF2010LF-01-R010-G | IRC | Res 0.01 2% 2010 |
| 575-4 | Keystone | Jack Banana |
| 8833 | Keystone | Stand-Off Nylon 0.50” (Snap-On) |
| LTC3833EUDC#PBF | Linear Technology | IC LTC3833EUDC |
| RN5326 | Tepro | Res 0.000 2512 (DCR Sense Version) |
| DPAK-TO252AA | Vishay | 6 1 Q5 MOSFET N-CH 30-V (D-S) DPAK-TO252AA Vishay SUD50N03-12P-E3 |