I'm hunting for a switch-mode controller to implement a low-output-ripple inverse-SEPIC (Zeta) regulator, as part of an RF application running on noisy USB power.
The best IC I've found so far is the
MIC2193, which has the following desired features:
- High side P-channel gate driver which enables straight-forward Zeta implementation.
- Synchronous N-channel gate driver for high efficiency.
- Current-mode control and slope compensation for fast transient response and good stability.
- Low pin count
- Low cost
My second choice at the moment is the
LTC1773, which is similar but is a bit more expensive and comes with a couple unnecessary pins/features. Figure 10 in that datasheet is close to what I'm going for.
My concern is they are both rather old parts, and stock levels seem low. I'm hoping someone can recommend similar alternatives that aren't as likely to become EOL. Any input is appreciated.