TC125/TC126 pdf datasheet (PFM

The TC125/126 step-up (Boost) switching regulators
furnish output currents to a maximum of 80 mA
(VIN = 2V, VOUT = 3V) with typical efficiencies above
80%. These devices employ pulse frequency modulation
(PFM) for minimum supply current at low loads.
They are ideal for battery-operated applications
powered from one or more cells. Maximum supply
current is less than 70 μA at full output load, and less
than 5 μA in standby (VOUT = 3V). Both devices require
only an external inductor, diode, and capacitor to
implement a complete DC/DC regulator.
The TC126 has separate output voltage sensing and
chip power inputs for greater application flexibility. The
TC125 combines the output voltage sensing and chip
power inputs onto a single package pin, but adds a
power-saving Shutdown mode that suspends regulator
operation and reduces supply current to less than 0.5
μA when the shutdown control input (SHDN) is low.
The TC125/TC126 are available in a small 5-Pin
SOT-23 package, occupy minimum board space and
use small external components. The TC125 accepts
input voltages from 2V to 10V. The TC126 accepts
input voltages from 2.2V to 10V. Both the TC125 and
TC126 have a start-up voltage of 0.9V at light load.