August 1999

5

MIC2954

MIC2954

Micrel

Note 11. The MIC2954 features fold-back current limiting. The short circuit (V

output voltage.

Note 12. Thermal regulation is defined as the change in output voltage at a time t after a change in power dissipation is applied, excluding load or line

regulation effects. Specifications are for a 200mA load pulse at V

Note 13. V

Note 14. Comparator thresholds are expressed in terms of a voltage differential at the FB pin below the nominal reference voltage measured at 6V

input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = V

example, at a programmed output voltage of 5V, the error output is guaranteed to go low when the output drops by

95mV

× 5V/1.235V = 384mV. Thresholds remain constant as a percent of V

typically 5% below nominal, 7.5% guaranteed.

Note 15. V

Note 16. When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to

ground.

Note 17. Maximum positive supply voltage of 60V must be of limited duration (<10ms) and duty cycle (<1%). The maximum continuous supply voltage

is 30V.