New Buck Boost IC from TI

Datasheet

        http://focus.ti.com/lit/ds/symlink/tpic74100-q1.pdf

Product page

        http://focus.ti.com/docs/prod/folders/print/tpic74100-q1.html?DCMP=hpa_pmp_general&HQS=DataSheet+PR+sc07073

Output 5V, 1A.
Input 1.5V - 40V.
Some Iout limitations at very low Vin.
eg    Io = 120 mA at Vin = 1.5V
        I= = 200 mA at Vin = 2V

PWP HTSSOP package makes use "problematic" for home users.
Otherwise quite a useful IC.

Efficiency typically only in the 70%-80% range due to the tradeoffs 
required by buck boost operation.
Quite a few extra features as well as a basic SMPS capability eg low 
voltage alarm, reset, current limited auxiliary output, ...

Modest operating frequency (300-500 kHz range) by modern standards 
leads to larger than some inductor (22-100 uH)

Needs external inductor. Also a bootstrap diode for very low Vin 
operation.
All internal power diodes are implemented by FETs to provide 
synchronous operation.



        Russell

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