10.1 Layout Guidelines

1. The bypass capacitor for V_CC must be placed as close as possible to the V_CC pin.
2. The resistor R_REF must be placed as close as possible to the I_REF and Ground pins with minimal trace length to keep the I_REF current as accurate as possible. The LM9061 is optimized for use with a 15.4 kΩ ±1% resistor for R_REF.
3. In applications where the V_CC supply is subject to high levels of transient noise, a bypass capacitor across R_REF is recommended. This bypass capacitor must be no larger than 0.1 μF and must be placed as close as possible to the I_REF pin.
4. The R_THRESHOLD and R_SENSE resistors must be placed as close as possible to the MOSFET drain and source pins respectively. This allows accurate monitoring of the V_DS voltage across the MOSFET.
5. An array of vias can be placed along the high current path to the output load. These vias can help conduct heat to any inner plane areas or to a bottom-side copper plane.

10.2 Layout Examples

Figure 26 and Figure 27 are layout examples for the LM9061 and LM9061-Q1. These examples are taken from the LM9061EVM. For information on the operation and schematic of the EVM, see LM9061 High-Side Protection Controller EVM (SNOU132).

Figure 26. LM9061EVM Layout Example (Top)

Figure 27. LM9061EVM Layout Example (Bottom)