Charge pump for dual-rail generation — what the ratings mean
The MAX680CSA+T is a charge pump IC that generates a fixed dual-rail output of ±2 times the input voltage from a single positive supply. It delivers up to 10 mA per rail, switching at 8 kHz, and comes in an 8-SOIC package.
10 mA output — sizing the load
The 10 mA per-rail limit is the hard constraint. Exceed 10 mA and the output voltage droops — the part has no synchronous rectifier, so efficiency drops with load.
8 kHz switching — capacitor selection and ripple
At 8 kHz, the flying capacitor and output reservoir capacitor dominate ripple. Typical application circuits use 10 µF electrolytic or tantalum on both the input and output. The ripple frequency is 8 kHz, so a ceramic with low ESR in parallel helps knock down high-frequency hash. Keep the flying capacitor close to the IC — trace inductance at 8 kHz is manageable, but long loops couple switching noise into the load.
Package and ordering code
The MAX680CSA+T is the tape-and-reel variant of the SOIC-8 MAX680CSA. The +T suffix means it ships on a reel. Cut Tape (CT) is also available for prototype or small-batch builds.
Lifecycle and sourcing
The MAX680CSA+T is listed as Active with ROHS3 compliance. No end-of-life notice or last-time-buy window is in effect. The part is available through independent distribution and is quoted to order against an RFQ — current pricing and lead time are confirmed at quote time.