Analog Devices DC3103A Demonstration Circuit User Guide
DC3103A demonstrates the LT3942 4-switch buck-boost regulator, providing 12V output at 1A from a 3V-36V input with 2MHz switching frequency and SSFM for low EMI performance.
Overview
The DC3103A demonstration circuit is a monolithic 4-switch buck-boost voltage regulator featuring the LT3942. It provides a 12V output with up to 1A current capability when the input voltage is between 7V and 36V, though it can operate down to 3V with reduced power. The design is optimized for a 2MHz switching frequency and includes spread spectrum frequency modulation (SSFM) to enhance EMI performance. The LT3942 integrates synchronous 40V switches for high efficiency and supports both constant-voltage and constant-current regulation. The document includes a complete bill of materials, schematic diagram, and performance summaries such as efficiency vs. load and thermal imaging.
Use Cases
- Automotive power supplies
- Industrial voltage regulation
- Battery-powered equipment
- Constant voltage power conversion
- High-efficiency DC-DC regulation
Topics
Referenced Parts
LT3942EUFD#PBF
Analog Devices
IC, 36V, 2A SYNC. BUCK-BOOST CVRTR, QFN-28
62000621121
Wurth Elektronik
CONN., HDR, MALE, 2x3, 2mm, VERT, ST, THT
QFN-28
Analog Devices
19 1 U1 IC, 36V, 2A SYNC. BUCK-BOOST CVRTR, QFN-28, ANALOG DEVICES, LT3942EUFD#PBF
AEC-Q200
Panasonic
16 1 R10 RES., 34.8k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF3482X
AEC-Q200
Panasonic
12 1 R4 RES., 14.3k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF1432X
AEC-Q200
Panasonic
14 1 R7 RES., 402k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF4023X
AEC-Q200
Panasonic
18 1 R12 RES., 324k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF3243X
AEC-Q200
Panasonic
8 2 R18, R19 RES., 0 OHM, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2GE0R00X
AEC-Q200
TDK
6 1 C6 CAP., 470pF, C0G, 50V, 5%, 0402, AEC-Q200 TDK, CGA2B2C0G1H471J050BA
AEC-Q200
Vishay
17 1 R11 RES., 1M OHM, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00JNED
AEC-Q200
Vishay
9 1 R22 RES., 0 OHM, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04020000Z0ED
AEC-Q200
Vishay
10 1 R2 RES., 110k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402110KFKED
AEC-Q200
Vishay
11 1 R3 RES., 10k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0JNED
AEC-Q200
Vishay
10 1 R13 RES., 100k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED
AEC-Q200
Vishay
15 1 R9 RES., 100k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED
2mm
Wurth Elektronik
4 1 XJP1 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421
| 04026D225KAT2A | AVX | CAP., 2.2uF, X5R, 6.3V, 10%, 0402 |
| 0402ZC104KAT2A | AVX | CAP., 0.1uF, X7R, 10V, 10%, 0402 |
| 12063C106KAT2A | AVX | CAP., 10uF, X7R, 25V, 10%, 1206 |
| C0402C224K9RACTU | Kemet | CAP., 0.22uF, X7R, 6.3V, 10%, 0402 |
| 2308-2-00-80-00-00-07-0 | Mill-Max | TEST POINT, TURRET, 0.064" MTG. HOLE, PCB |
| 2501-2-00-80-00-00-07-0 | Mill-Max | TEST POINT, TURRET, 0.094" MTG. HOLE, PCB |
| GRM155R61H474KE11D | Murata | CAP., 0.47uF, X5R, 50V, 10%, 0402 |
| EEHZC1H220P | Panasonic | CAP., 22uF, ALUM POLY HYB, 50V, 20%, 6.3x5.8mm, SMD |
| EEHZK1E680P | Panasonic | CAP., 68uF, ALUM POLY HYB, 25V, 20%, 6.3x5.8mm, SMD |
| ERJ2GE0R00X | Panasonic | RES., 0 OHM, 1/10W, 0402, AEC-Q200 |
| ERJ-2RKF1432X | Panasonic | RES., 14.3k OHMS, 1%, 1/10W, 0402, AEC-Q200 |
| ERJ-2RKF3243X | Panasonic | RES., 324k OHMS, 1%, 1/10W, 0402, AEC-Q200 |
| ERJ2RKF3482X | Panasonic | RES., 34.8k OHMS, 1%, 1/10W, 0402, AEC-Q200 |
| ERJ-2RKF4023X | Panasonic | RES., 402k OHMS, 1%, 1/10W, 0402, AEC-Q200 |
| CGA2B2C0G1H471J050BA | TDK | CAP., 470pF, C0G, 50V, 5%, 0402, AEC-Q200 |
| UMK316BBJ106KL-T | Taiyo Yuden | CAP., 10uF, X5R, 50V, 10%, 1206 |
| CRCW04020000Z0ED | Vishay | RES., 0 OHM, 1/16W, 0402, AEC-Q200 |
| CRCW0402100KJNED | Vishay | RES., 100k OHMS, 5%, 1/16W, 0402, AEC-Q200 |
| CRCW040210K0JNED | Vishay | RES., 10k OHMS, 5%, 1/16W, 0402, AEC-Q200 |
| CRCW0402110KFKED | Vishay | RES., 110k OHMS, 1%, 1/16W, 0402, AEC-Q200 |
| CRCW04021M00JNED | Vishay | RES., 1M OHM, 5%, 1/16W, 0402, AEC-Q200 |
| CRCW040268K0JNED | Vishay | RES., 68k OHMS, 5%, 1/16W, 0402 |
| 60800213421 | Wurth Electronics | CONN., SHUNT, FEMALE, 2 POS, 2mm |
| 74438336033 | Wurth Electronics | IND., 3.3uH, WE-MAPI, 20%, 2.2A, 114mOHMS, 3020 |
| LT3942EUFD#PBF | Analog Devices | IC, 36V, 2A SYNC. BUCK-BOOST CVRTR, QFN-28 |
| 62000621121 | Wurth Elektronik | CONN., HDR, MALE, 2x3, 2mm, VERT, ST, THT |
| QFN-28 | Analog Devices | 19 1 U1 IC, 36V, 2A SYNC. BUCK-BOOST CVRTR, QFN-28, ANALOG DEVICES, LT3942EUFD#PBF |
| AEC-Q200 | Panasonic | 16 1 R10 RES., 34.8k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF3482X |
| AEC-Q200 | Panasonic | 12 1 R4 RES., 14.3k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF1432X |
| AEC-Q200 | Panasonic | 14 1 R7 RES., 402k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF4023X |
| AEC-Q200 | Panasonic | 18 1 R12 RES., 324k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF3243X |
| AEC-Q200 | Panasonic | 8 2 R18, R19 RES., 0 OHM, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2GE0R00X |
| AEC-Q200 | TDK | 6 1 C6 CAP., 470pF, C0G, 50V, 5%, 0402, AEC-Q200 TDK, CGA2B2C0G1H471J050BA |
| AEC-Q200 | Vishay | 17 1 R11 RES., 1M OHM, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00JNED |
| AEC-Q200 | Vishay | 9 1 R22 RES., 0 OHM, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04020000Z0ED |
| AEC-Q200 | Vishay | 10 1 R2 RES., 110k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402110KFKED |
| AEC-Q200 | Vishay | 11 1 R3 RES., 10k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0JNED |
| AEC-Q200 | Vishay | 10 1 R13 RES., 100k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED |
| AEC-Q200 | Vishay | 15 1 R9 RES., 100k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED |
| 2mm | Wurth Elektronik | 4 1 XJP1 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421 |