LT8603 Quad Output Buck Converter and SEPIC Channel Demo Manual (DC2469A)
DC2469A features the LT8603 quad-output regulator, delivering 8V, 5V, 3.3V, and 1.8V outputs. The SEPIC channel allows regulated outputs to ride through automotive cold crank.
Overview
The DC2469A demonstration circuit evaluates the LT8603, a low IQ quad-output power management IC. The board features three monolithic buck regulators and a boost channel configured as a SEPIC converter. Designed for a nominal 12V input, it provides regulated outputs of 8V, 5V, 3.3V, and 1.8V. The SEPIC configuration enables the system to maintain regulated outputs during automotive cold crank scenarios where input voltage drops significantly. The buck regulators operate at a 2MHz switching frequency with 180-degree phasing to minimize input ripple, while the SEPIC channel operates at 400kHz. Key features included in the design are cycle-by-cycle current limiting, independent channel enabling, and Burst Mode operation for high efficiency at light loads.
Use Cases
- Automotive electronics power management
- Cold crank ride-through systems
- Industrial multi-rail power supplies
- Transportation equipment power
- Battery-powered high-efficiency systems
Topics
Referenced Parts
Murata
CVIN4, CVIN5, CVIN6, CVIN7 Cap, X5R 10μF 50V 10% 1206 Murata, GRM31CR61H106KA12L
Vishay
R24, R27, R32, R33, R36, R37 Res, Jumper, Chip, 0Ω 0603 Vishay, CRCW06030000Z0EA
Wurth Elektronik
JP1, JP2, JP3, JP4, JP5 Headers, 3 Pins 2mm Ctrs Wurth Elektronik, 62000311121
Wurth Elektronik
MH1 to MH4 STAND-OFF, NYLON 0.25" Tall (SNAP ON) Wurth Electronik, 702931000
1.5A
Maxim
with 1.5A maximum output load current, and VOUT2 is
1.8A
Maxim
put VOUT3 is regulated at 1.8V with 1.8A maximum load
2.5A
Maxim
at 3.3V with 2.5A maximum output load current. The low
| LTC6908CS6-1#PBF | Analog Devices | U2 IC, LTC6908CS6-1 TSOT-23-6 Analog Device, LTC6908CS6-1#PBF |
| BSZ067N06LS3G | Infineon | Q1 MOSFET-N Channel, PG-TSDSON-8 Infineon, BSZ067N06LS3 G |
| 2501-2-00-80-00-00-07-0 | Mill-Max | E1 to E20 Turret, Testpoint Mill Max, 2501-2-00-80-00-00-07-0 |
| GRM155R61A225KE95D | Murata | C13, C19, C23 Cap, X7R 2.2μF 10V 10% 0402 Murata, GRM155R61A225KE95D |
| GRM155R71C104KA88D | Murata | C10, C17 Cap, X7R 0.1μF 16V 10% 0402 Murata, GRM155R71C104KA88D |
| GRM155R71H104KE14J | Murata | C2, C3, C32 Cap, X7R 0.1μF 50V 10% 0402 Murata, GRM155R71H104KE14J |
| GRM1885C1E152JA01D | Murata | C25 Cap, C0G 1500pF 25V 5% 0603 Murata, GRM1885C1E152JA01D |
| GRM1885C1H220JA01D | Murata | C31 Cap, C0G 22pF 50V 5% 0603 Murata, GRM1885C1H220JA01D |
| GRM1885C1H2R2CA01D | Murata | C29 Cap, C0G 2.2pF 50V ±0.25pF 0603 Murata, GRM1885C1H2R2CA01D |
| GRM1885C1H4R7CA01D | Murata | C30 Cap, C0G 4.7pF 50V ±0.25pF 0603 Murata, GRM1885C1H4R7CA01D |
| GRM188R60J106ME47D | Murata | CVIN3 Cap, X5R 10μF 6.3V 20% 0603 Murata, GRM188R60J106ME47D |
| GRM188R61A475KE15D | Murata | C20, C21 Cap, X7R 4.7μF 10V 10% 0603 Murata, GRM188R61A475KE15D |
| GRM188R61H105KAALD | Murata | CVIN Cap, X5R 1μF 50V 10% 0603 Murata, GRM188R61H105KAALD |
| GRM188R71C473KA01D | Murata | C11, C15 Cap, X7R 47nF 25V 20% 0603 Murata, GRM188R71C473KA01D |
| GRM188R71H104KA93D | Murata | C8 Cap, X7R 0.1μF 50V 10% 0603 Murata, GRM188R71H104KA93D |
| GRM21BR71C475KA73L | Murata | CVIN1, CVIN2 Cap, X7R 4.7μF 16V 10% 0805 Murata, GRM21BR71C475KA73L |
| GRM31CR60J107ME39K | Murata | C18 Cap, X5R 100μF 6.3V 20% 1206 Murata, GRM31CR60J107ME39K |
| GRM31CR61A476KE15L | Murata | C12, C22 Cap, X5R 47μF 10V 10% 1206 Murata, GRM31CR61A476KE15L |
| GRM31CR61H106KA12L | Murata | CVIN4, CVIN5, CVIN6, CVIN7 Cap, X5R 10μF 50V 10% 1206 Murata, GRM31CR61H106KA12L |
| GRM31CR71H475KA12L | Murata | C26, C27 Cap, X7R 4.7μF 50V 10% 1206 Murata, GRM31CR71H475KA12L |
| GRM32ER61C476KE15K | Murata | C6, C9 Cap, X5R 47μF 16V 10% 1210 Murata, GRM32ER61C476KE15K |
| GRM32ER71H106KA12L | Murata | C34, C38 Cap, X7R 10μF 50V 10% 1210 Murata, GRM32ER71H106KA12L |
| NPIM42P1R0MTRF | NIC Components | L4 Inductor, 1μH NPIM42P NIC Comp Corp, NPIM42P1R0MTRF |
| PMEG060V050EPD | Nexperia | D1 Schottky Rectifier, 60V, 5A, SOT1289 Nexperia, PMEG060V050EPD |
| 2SN-BK-G | Samtec | XJP1, XJP2, XJP3, XJP4, XJP5 Shunt, 2mm Ctrs Samtec, 2SN-BK-G |
| 16CE47BS | Sun Electronic Industries | C7 Cap, Alum 47μF 16V 20% Sun Elect Ind, 16CE47BS |
| 50CE22BSS | Sun Electronic Industries | C1 Cap, Alum 22μF 50V 10% Sun Elect Ind, 50CE22BSS |
| CRCW06030000Z0EA | Vishay | R24, R27, R32, R33, R36, R37 Res, Jumper, Chip, 0Ω 0603 Vishay, CRCW06030000Z0EA |
| CRCW060310K0FKEA | Vishay | R21 Res, Chip 10k 0.1W 1% 0603 Vishay, CRCW060310K0FKEA |
| CRCW0603150KFKEA | Vishay | R18 Res, Chip 150k 0.1W 1% 0603 Vishay, CRCW0603150KFKEA |
| CRCW0603187KFKEA | Vishay | R17 Res, Chip 187k 0.1W 1% 0603 Vishay, CRCW0603187KFKEA |
| CRCW06031M00FKEA | Vishay | R15 Res, Chip 1M 0.1W 1% 0603 Vishay, CRCW06031M00FKEA |
| CRCW0603200KFKEA | Vishay | R9, R11, R13, R14, R19 Res, Chip 200k 0.1W 1% 0603 Vishay, CRCW0603200KFKEA |
| CRCW060324K9FKEA | Vishay | R2, R3, R4, R5 Res, Chip 24.9k 0.1W 1% 0603 Vishay, CRCW060324K9FKEA |
| CRCW06032M49FKEA | Vishay | R23 Res, Chip 2.49M 0.1W 1% 0603 Vishay, CRCW06032M49FKEA |
| CRCW060330K1FKEA | Vishay | R16 Res, Chip 30.1k 0.1W 1% 0603 Vishay, CRCW060330K1FKEA |
| CRCW0603365KFKEA | Vishay | R7 Res, Chip 365k 0.1W 1% 0603 Vishay, CRCW0603365KFKEA |
| CRCW06033M32FKEA | Vishay | R6 Res, Chip 3.32M 0.1W 1% 0603 Vishay, CRCW06033M32FKEA |
| CRCW0603464KFKEA | Vishay | R12 Res, Chip 464k 0.1W 1% 0603 Vishay, CRCW0603464KFKEA |
| CRCW0603806KFKEA | Vishay | R8 Res, Chip 806k 0.1W 1% 0603 Vishay, CRCW0603806KFKEA |
| CRCW08050000Z0EA | Vishay | L1, R34 Res, Jumper, Chip, 0Ω 0805 Vishay, CRCW08050000Z0EA |
| LT8603EUJ | Analog Devices | U1 IC, Buck Regulator QFN (40) (UJ) Analog Device, LT8603EUJ |
| XEL4030-152ME | Coilcraft | L3 Inductor, 1.5μH XEL4030 Coilcraft, XEL4030-152ME |
| XEL4030-332ME | Coilcraft | L2 Inductor, 3.3μH XEL4030 Coilcraft, XEL4030-332ME |
| PMEG6002EB | NXP | D2, D3 Schottky Rectifier, 0.2A, SOD523 NXP, PMEG6002EB |
| RL3720WT-R008-F | Susumu | R1 RES, CHIP, 0.008, 1W, 1%, 0815 Susumu, RL3720WT-R008-F |
| 62000311121 | Wurth Elektronik | JP1, JP2, JP3, JP4, JP5 Headers, 3 Pins 2mm Ctrs Wurth Elektronik, 62000311121 |
| 702931000 | Wurth Elektronik | MH1 to MH4 STAND-OFF, NYLON 0.25" Tall (SNAP ON) Wurth Electronik, 702931000 |
| 742792150 | Wurth Elektronik | FB1 BEAD, 4A 1206 Wurth Elektronik, 742792150 |
| 7448700015 | Wurth Elektronik | L5 Inductor, 1.5μH Wurth Elektronik, 7448700015 |
| PG-TSDSON-8 | Infineon | 30 1 Q1 MOSFET-N Channel, PG-TSDSON-8 Infineon, BSZ067N06LS3 G |
| SOD523 | NXP | 23 2 D2, D3 Schottky Rectifier, 0.2A, SOD523 NXP, PMEG6002EB |
| 1.5A | Maxim | with 1.5A maximum output load current, and VOUT2 is |
| 1.8A | Maxim | put VOUT3 is regulated at 1.8V with 1.8A maximum load |
| 2.5A | Maxim | at 3.3V with 2.5A maximum output load current. The low |