Jymc220bi Schematic Full (NEWEST)

Vin ---- C1 ----+----+--------------------+----> VOUT | | | | IC1 D1 | (JYMC‑220BI) | | |--- SW (pin 3) ----+---|<---+ | | | | | L1 (integrated) | | | | | | +----+--- GND ---------+----------+ | | C3 C2 | | GND GND In a real PCB you will see a thermal pad on the bottom of the IC that should be soldered to a copper area (often connected to ground) to aid heat dissipation. 4. Pin‑out & Electrical Characteristics | Pin | Name | Description | Typical Voltage | |-----|------|-------------|-----------------| | 1 | VIN | Input voltage (4.5 – 38 V) | – | | 2 | GND | Ground (common) | 0 V | | 3 | SW | Switching node (connects to the internal MOSFET) | Pulses between VIN and GND | | 4 | FB | Feedback (fixed internally for 5 V/12 V; external for adjustable) | ≈ 0.6 V (reference) | | 5 | EN | Enable pin (active‑high). Pull high to turn on; pull low to shut down. | 0 V or 3.3 V | | 6 | SS | Soft‑start control (optional). Usually left unconnected; pulling low reduces inrush current. | – | | 7 | TEMP | Internal temperature sensor (not usually accessed). | – |