# Waveguide Driver ## Description Waveguide Driver - add U2 EN pull-down and U2_VOUT_NEG bleeder ## Project Details - **Owner:** toshbeats - **Created:** 2/2/2026 - **Last Updated:** 2/9/2026 - **Visibility:** Public - **VIN (assumed):** 5V - **VIN:** 3.3V - **Passive sourcing notes:** Target: JLC/LCSC-friendly passives in 0201/0402 only. Voltage derating policy: 3.3 V <= 60% of Vrated -> Vrated >= 5.5 V (use 6.3 V min; 10 V required for LM27761 flying cap and CPOUT). Note DC-bias: 10 uF 0402 X5R/X7R may de-rate significantly; verify effective capacitance at applied bias. - **Capacitor derating policy:** <=60% of voltage rating - **Copies:** 5 ## Key Components ### IC1 — [LM3881MMX/NOPB](https://www.flux.ai/adrian95/lm3881mmxnopb.md) - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Flm3881 - Manufacturer Part Number: LM3881MMX/NOPB - Part Type: Integrated Circuit - Manufacturer Name: Texas Instruments - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - EN [pin 2] - FLAG1 [pin 8] - FLAG2 [pin 7] - FLAG3 [pin 6] - GND [pin 3] - INV [pin 4] - TADJ [pin 5] - VCC [pin 1] ### J1 — 5050701422 SPECIAL - Part Type: Connector - Manufacturer Name: Molex - Manufacturer Part Number: 5050701422 **Pins:** - CS_CHIP [pin 7] - CS_FLASH [pin 4] - DIO0 [pin 9] - DIO1 [pin 13] - DIO2 [pin 1] - DIO3 [pin 5] - GND [pin 10] - GND [pin 12] - GND [pin 14] - P1 [pin 15] - P1_1 [pin 17] - P2 [pin 16] - P2_2 [pin 18] - PGMDB [pin 11] - SCLK [pin 3] - VCC2.5V [pin 6] - WP_FLASH [pin 8] - XIN [pin 2] ### U1 — [T55A107M6R3C0070](https://www.flux.ai/lcsc/t55a107m6r3c0070.md) - Manufacturer Name: VISHAY(威世) - LCSC Part Number: C3151610 - Package or Case Code: C1206 - JLCPCB Part Class: Extended Part - Manufacturer Part Number: T55A107M6R3C0070 - Part Type: Tantalum Capacitors **Pins:** - 1 [pin 1] - 2 [pin 2] ### U2 — [LM27761DSGT](https://www.flux.ai/lcsc/lm27761dsgt.md) - Package or Case Code: WFDFN-8_L2.0-W2.0-P0.50-BL-EP - Manufacturer Name: TI(德州仪器) - Manufacturer Part Number: LM27761DSGT - JLCPCB Part Class: Extended Part - LCSC Part Number: C2070605 - Part Type: DC-DC Converters **Pins:** - C1- [pin 7] - C1+ [pin 8] - CPOUT [pin 3] - EN [pin 6] - GND [pin 2] - PAD [pin 9] - VFB [pin 5] - VIN [pin 1] - VOUT [pin 4] ### U6 — [ADM7155ACPZ-01-R7](https://www.flux.ai/lcsc/adm7155acpz-01-r7.md) - Package or Case Code: LFCSP-8_L3.0-W3.0-P0.50-BL-EP-2 - LCSC Part Number: C658455 - Manufacturer Name: ADI(亚德诺) - JLCPCB Part Class: Extended Part - Manufacturer Part Number: ADM7155ACPZ-01-R7 **Pins:** - BYP [pin 3] - EN [pin 7] - EP [pin 9] - GND [pin 4] - REF [pin 6] - REF_SENSE [pin 5] - VIN [pin 8] - VOUT [pin 2] - VREG [pin 1] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/toshbeats/waveguide-driver](https://www.flux.ai/toshbeats/waveguide-driver).* --- *Generated from [https://www.flux.ai/toshbeats/waveguide-driver](https://www.flux.ai/toshbeats/waveguide-driver)*