BOM-DAT/diode-dat/diode-dat.md
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@@ -178,6 +178,10 @@ For **high-voltage AC** rectification (like 220V/110V mains power supplies):
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+## ESD protection
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+
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+- [[protection-dat]]
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+
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## ref
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Chip-dat/MPS-DAT/2025-10-02-19-01-56.png
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Chip-dat/MPS-DAT/MPS-dat.md
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@@ -67,5 +67,11 @@ MPM3610 == 21V Input, 1A Module Synchronous Step-down Converter with Integrated
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![](2025-08-07-13-05-43.png)
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+## MP28167
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+
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+2.8V-22V VIN, 3A IOUT, 4-Switch Integrated Buck-Boost Converter with Fixed 5V Output
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+
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+![](2025-10-02-19-01-56.png)
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+
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## ref
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Chip-dat/Microchip-dat/microchip-dat.md
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@@ -24,6 +24,13 @@ Single/Multiple RPM-Based PWM Fan Controller
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- TACH 1 == Tach 1 Input
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+## MCP4017
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+
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+MCP4017 == 7-Bit Single Digital POT in SC70 w/I2C™
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+
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+- [[TI-power-dat]]
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+
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+
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## ref
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- [[chip-dat]]
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Chip-dat/TI-dat/TI-Power-dat/2025-10-02-19-04-40.png
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Chip-dat/TI-dat/TI-Power-dat/TI-power-dat.md
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@@ -24,6 +24,15 @@ BQxx
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- [[BQ24650-dat]] == Standalone 1-6 cell Buck battery charge controller with solar input and integrated MPPT
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+## TPS5450
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+
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+
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+TPS5450 5-A, Wide Input Range, Step-Down Converter
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+
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+- [[MCP4017-dat]] - [[microchip-dat]]
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+
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+![](2025-10-02-19-04-40.png)
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+
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## ref
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Chip-dat/silergy-dat/SY8120-dat/2025-10-02-19-03-16.png
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Chip-dat/silergy-dat/SY8120-dat/SY8120-dat.md
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@@ -41,6 +41,10 @@ Rl = 0.6V / (Vout - 0.6V) * Rh
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= 0.6V / (4.3V - 0.6V) * 100K = **16.1K**
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+## SCH
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+
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+![](2025-10-02-19-03-16.png)
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+
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## ref
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- [[HDK]] - [[HDK-dat]]
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Circuits-dat/protection-dat/ESD-dat/2025-10-02-18-59-04.png
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Circuits-dat/protection-dat/ESD-dat/ESD-dat.md
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@@ -8,4 +8,34 @@
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- [[ethernet-ESD-dat]]
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-TPD4EUSB30
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+TPD4EUSB30
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+
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+
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+
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+## dual diode clamp ESD protectoin
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+
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+Two diodes connected in series with a **common node**.
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+
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+---
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+
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+## 2. Pin Configuration
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+If you connect it like:
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+- One diode goes from **Common → 3.3V**
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+- Other diode goes from **Common → GND**
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+
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+It means:
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+- **D1**: Cathode at 3.3V, Anode at Common
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+- **D2**: Anode at GND, Cathode at Common
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+
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+So the common pin sits in the **middle** between **0V (GND)** and **3.3V (VCC)**, clamped by diodes.
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+
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+---
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+
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+## 3. Purpose of This Setup
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+This creates a **clamp/protection circuit**:
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+- If the signal on the **Common pin** rises above **3.3V + Vf (~3.9V)** → the upper diode conducts → clamps to 3.3V rail.
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+- If the signal falls below **0V – Vf (~–0.7V)** → the lower diode conducts → clamps to GND.
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+
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+👉 This is often used as an **ESD protection** or **logic level protection** for sensitive inputs.
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+![](2025-10-02-18-59-04.png)
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