ZHCSD40P April 2012 – January 2024 LP5907
PRODUCTION DATA
The LP5907 is designed to work with ceramic capacitors on the input and output to take advantage of the benefits these components offer. For capacitance values in the range of 1µF to 10µF, ceramic capacitors are the smallest, least expensive and have the lowest ESR values, thus making them best for eliminating high-frequency noise. The ESR of a typical 1µF ceramic capacitor is in the range of 20mΩ to 40mΩ, which easily meets the ESR requirement for stability for the LP5907.
A better choice for temperature coefficient in a ceramic capacitor is X7R. This type of capacitor is the most stable and holds the capacitance within ±15% over the temperature range. Tantalum capacitors are less desirable than ceramic for use as output capacitors because they are more expensive when comparing equivalent capacitance and voltage ratings in the 1µF to 10µF range.
Another important consideration is that tantalum capacitors have higher ESR values than equivalent size ceramics. Which means that although a tantalum capacitor can possibly be found with an ESR value within the stable range, the capacitor must be larger in capacitance (which means bigger and more costly) than a ceramic capacitor with the same ESR value. The ESR of a typical tantalum increases by approximately 2:1 when the temperature goes from 25°C down to –40°C, so some guard band must be allowed.