Project Idea Starter
Thought for 23 sec
flux
U2 — TPS63900DSKR buck-boost converter
U2 pin connections
VIN source
Table
| U2 pin | Connected net | Connected components |
|---|---|---|
| 1 — EN | BAT_FUSED | F2 P2, VIN, C15 P1, C17 P1, TP_BAT |
| 2 — SEL | BAT- | Grounded to select the CFG3-programmed output |
| 3 — CFG1 | U2_CFG1 | R14 P1 |
| 4 — CFG2 | U2_CFG2 | R15 P1 |
| 5 — CFG3 | U2_CFG3 | R13 P1 |
| 6 — VOUT | 3V3_SYS | C16 P1 and downstream 3.3 V loads |
| 7 — LX2 | U2_LX2 | L2 P2 |
| 8 — GND | BAT- | Battery return |
| 9 — LX1 | U2_LX1 | L2 P1 |
| 10 — VIN | BAT_FUSED | F2 P2, EN, C15 P1, C17 P1, TP_BAT |
| 11 — EP | BAT- | Exposed thermal/ground pad |
J2 pin 1 / BAT+ → F2 (1 A resettable fuse) → BAT_FUSED → U2 VINThe return is
Inductor
BAT-, connected to system GND through the existing R11 0 Ω star link.- L2: 2.2 µH, 1.5 A rated, 2 A saturation
- P1 →
U2_LX1→ U2 pin 9 - P2 →
U2_LX2→ U2 pin 7
- P1 →
- C15: 10 µF, 10 V X7R input bulk
- P1 →
BAT_FUSED - P2 →
BAT-
- P1 →
- C17: 100 nF, 10 V X7R input bypass
- P1 →
BAT_FUSED - P2 →
BAT-
- P1 →
- C16: 22 µF, 10 V X7R output bulk
- P1 →
3V3_SYS - P2 →
BAT-
- P1 →
- R13: 16.2 kΩ, 1%
U2_CFG3→BAT-- Programs the selected 3.3 V output with SEL low
- R14: 36.5 kΩ, 1%
U2_CFG1→BAT-
- R15: 0 Ω, 1%
U2_CFG2→BAT-- Selects the configured input-current setting
VOUT net:
3V3_SYS, nominally 3.3 V.Review regulator wiring
Check power budget
Audit radar supply
Run full ERC
