MCP73831 Pin Function Overview

flux

0:25

Using the provided values:
  • MOSFET Gate Charge (Q₍g₎): Example value of 30 nC (from your MOSFET’s datasheet)
  • Additional Charge (Q₍extra₎): 5 nC (calculated as 1 µA × 5 µs)
  • Allowed Voltage Droop (ΔV₍boot₎): 0.5 V
The minimum bootstrap capacitor required is calculated as:
Cboot≥30 nC+5 nC0.5 V=35 nC0.5 V=70 nF\Large C_{boot} \ge \frac{30\,nC + 5\,nC}{0.5\,V} = \frac{35\,nC}{0.5\,V} = 70\,nF
Applying a safety factor of 10 for robust design:
Cboot,design≈10×70 nF=700 nF\Large C_{boot, design} \approx 10 \times 70\,nF = 700\,nF
A standard capacitor value near or above 700 nF (for example, 680 nF or 1 µF) would be appropriate.
424 days
albertsanchez98

albertsanchez98

Q total is 86nC, VCC is between 10-14V, i'm using 1N5829 bootstrap diode and LTC4446 driver
424 days

flux

0:20

Using the provided parameters:
  • Total Gate Charge (Qₜₒₜₐₗ): 86 nC
  • Additional Charge (Q₍extra₎): 5 nC (assuming 1 µA leakage over 5 µs)
  • Allowed Voltage Droop (ΔV₍boot₎): 0.5 V
Calculation Steps:
  1. Calculate the Minimum Required Capacitance:
    Cboot≥Qtotal+QextraΔVboot=86 nC+5 nC0.5 V=91 nC0.5 V=182 nF\Large C_{boot} \ge \frac{Q_{total} + Q_{extra}}{\Delta V_{boot}} = \frac{86\,nC + 5\,nC}{0.5\,V} = \frac{91\,nC}{0.5\,V} = 182\,nF
  2. Apply a Safety Factor of 10:
    Cboot,design≈10×182 nF=1820 nF\Large C_{boot, design} \approx 10 \times 182\,nF = 1820\,nF
Final Design Recommendation:
Select a standard bootstrap capacitor value near or above 1.82 µF (for example, 2.2 µF) to ensure robust operation.
This calculation takes into account your driver (LTC4446), the MOSFET's parameters, and the chosen bootstrap diode (1N5829) under the given supply voltage (10–14 V).
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