ZHCSEK7D June 2015 – May 2021 LM53600-Q1 , LM53601-Q1
PRODUCTION DATA
Input capacitors serve two important functions: The first is to reduce input voltage ripple into the LM53601-Q1 and the input filter of the system. The second is to reduce high frequency noise. These two functions are implemented most effectively with separate capacitors, see Table 9-4.
| CAPACITOR | RECOMMENDED VALUE | COMMENT |
|---|---|---|
| CIN_HF | 0.1 μF | This capacitor is used to suppress high frequency noise originating during switching events. It is important to place capacitor as close to the LM53600-Q1 and LM53601-Q1 devices as design rules allow. Position is more important than exact capacity. Once high frequency propagates into a system, it can be hard to suppress or filter. Since this capacitor will be exposed to battery voltage in systems that operate directly off of battery, 50 V or greater rating is recommended. |
| CIN | 10 μF | This capacitance is used to suppress input ripple and transients due to output load transients. If CIN is too small, input voltage may dip during load transients resetting the system if the system is operated under low voltage conditions. 10 μF is intended to include all capacitance in the LM53600-Q1/LM53601-Q1’s input node. 4.7 μF adjacent to the LM53600-Q1 and LM53601-Q1 devices is recommended. Since this capacitor will be exposed to battery voltage in systems that operate directly off of battery, 50 V or greater rating is recommended. |
Table 9-5 shows recommended capacitor values other than input and output capacitors.
| CAPACITOR | MINIMUM VALUE | COMMENT |
|---|---|---|
| CBOOT | 0.1 μF | While a voltage rating of only 5 V is necessary, using a higher voltage rating is recommended. |
| CVCC | 1 μF | While a voltage rating of only 5 V is necessary, 16-V capacitors have a low voltage coefficient. |
| CBIAS | 0.01 μF | This capacitor should be rated to survive output voltage. |
Note that performance of converters utilizing an adjustable version of the LM53600-Q1 and LM53601-Q1 devices may be enhanced by adding CFF, a capacitor in parallel with RFBT. 100 pF is recommended.