140W Power Bank Mainboard, Bidirectional Fast Charging Power Bank Module, Circuit Board DIY Mainboar

# I. Product Positioning Power range: Supports 140 W (28 V/5 A) for both input and output, backward compatible with 100 W, 65 W, 45 W, 18 W and other full power levels. Self-charges over 70% in 30 minutes. Target applications: Laptops (MacBook Pro 16″ 140 W), gaming laptops, drones, outdoor power stations, high-speed power banks. Market outlook: PD3.1 EPR specification released in 2021, entered mass adoption phase in 2024–2025. The 140 W module marks the shift from “performance redundancy” to “essential user experience”. # II. Hardware Architecture (Example: Injoinic IP2366) ## Single-inductor Buck-Boost External 4 × 40 V/5 mΩ synchronous MOS + 1 × 4.7 µH/8 mm alloy inductor, achieving up to 96% peak efficiency. Switching frequency: 300 kHz, inductor ripple ≤ 30%, full-load temperature rise ≤ 45 °C (with 5 mm heat sink). ## Protocol & Protection On-chip integration of PD3.1, PPS/AVS, QC2.0–5, AFC/FCP/SCP, Apple 2.4 A, BC1.2 DCP, automatically identifies optimal PDO. 14-bit ADC real-time monitoring of VIN, VOUT, IBAT, VBAT; NTC thermal loop + software power limiting, hardware shutdown at 80 °C. ## Battery Management Supports 2–6 series Li-ion / LiFePO4 cells; charge voltage programmable at 4.2 V / 4.35 V / 3.6 V; built-in balancing with ±10 mV accuracy. Charging current adjustable 0.5–10 A, discharge current up to 30 A (limited by MOS and thermal design). ## Interface Configuration 2C1A classic layout: C1/C2 blind-plug 140 W, port A 30 W; simultaneous three-port output 140 W + 100 W + 30 W ≈ 270 W. External MCU (ES32F3654/N32G452) reads IP2366 registers via I²C, driving color screen/LED, fuel gauge, and button logic. # III. Key Performance Indicators (Test Data) | Item                  | Specification          | Remarks                                       | |-----------------------|------------------------|-----------------------------------------------| | Input Range           | 3–28 V                 | Compatible with any 5–28 V PD adapter         | | Output Range          | 3.3–28 V               | PPS 3.3–21 V/5 A, AVS 15–28 V/5 A             | | Peak Efficiency       | 96%                    | 18 V→20 V range, 60–100 W load                | | Standby Power         | 5 µA                   | Ship-mode, long-press key to wake up          | | OTP Protection        | 80 °C                  | Adjustable via software                       | | Inductor Peak Current | 38 A                   | 4.7 µH recommended, Isat ≥ 45 A               | | Dimensions            | 42 mm × 42 mm × 1.6 mm | Double-layer PCB, single-sided SMT            | # IV. Design & Mass Production Guidelines ## Inductor Selection Recommended: 4.7 µH, DCR ≤ 3 mΩ, Isat ≥ 45 A, package 10 mm × 10 mm. Shielded alloy inductor greatly reduces EMI. ## MOS Selection 40 V/5 mΩ level, Ciss ≤ 1 nC, package DFN5×6 or 3×3. Three parallel MOSFETs spread heat. ## PCB Layout Power loop ≤ 5 mm, Kelvin sensing with differential routing. Exposed copper + tin + glue on SW node to reduce spikes and temperature rise. ## Thermal Design At 140 W full load, MOS + inductor power consumption ≈ 5 W. Requires 5 mm aluminum heat sink or 0.3 mm graphite sheet + thermal pad. Metal enclosure recommended. ## Certification Strategy PD3.1 certification requires EPR 28 V aging, short-circuit, and arc testing. 0.2 mm safety spacing reserved on board; VBUS traces with 2 oz copper. ## Customer Lock-in & Customization IP2366 supports I²C voltage/current adjustment for secondary development. Watercore M12269 integrates dual PD PHY, loop compensation, and display driver, reducing development cycle from 6 months to 3 weeks. # Summary The 140 W bidirectional fast-charging module is built around a **single-inductor Buck-Boost + full-protocol SOC** design. With 96% efficiency, it seamlessly connects 6-series lithium batteries to the 28 V/5 A PD3.1 ecosystem, making it the ideal solution for next-generation high-performance power banks, outdoor energy storage, and vehicle backup power supplies.