300 kHz fixed frequency — no clock sync
The switching frequency is fixed at 300kHz with no external synchronization option. That simplifies the design — no oscillator timing resistor to set, no clock input to route — but it also means you cannot shift the switching harmonics away from a sensitive IF band or align the converter to a system clock. For most boost and buck-boost applications in industrial and battery gear this is not a limitation; the 300kHz fundamental is well above audio frequencies and keeps magnetics reasonably small. If your system requires frequency dithering or external sync for noise management, this part is not the fit.
Temperature grade and environment
Rated for -40°C to 85°C ambient (TA), this is a full industrial-temperature part. The 8-SOIC package is a standard footprint for rework and automated assembly alike.
Sourcing and lifecycle
The MAX1771ESA+T carries an Active lifecycle status with ROHS3 compliance. No official second-source or pin-compatible alternate is listed in the record, so dual-sourcing would require a separate qualification effort.