MIC2954 Micrel Semiconductor, MIC2954 Datasheet - Page 5

• Manufacturer Part Number: MIC2954
• Description: 250mA Low-Dropout Regulator
• Manufacturer: Micrel Semiconductor

Note 11. The MIC2954 features fold-back current limiting. The short circuit (V
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
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
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
Note 17. Maximum positive supply voltage of 60V must be of limited duration (<10ms) and duty cycle (<1%). The maximum continuous supply voltage
August 1999
MIC2954
output voltage.
regulation effects. Specifications are for a 200mA load pulse at V
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
typically 5% below nominal, 7.5% guaranteed.
ground.
is 30V.
REF
SHDN
V
5V/1.235V = 384mV. Thresholds remain constant as a percent of V
OUT
2V, V
IN
(V
IN
30 V,V
– 1V), 2.3V
OUT
= 0, with the FB pin connected to TAP.
V
IN
30V, 100 A < I
L
250 mA, T
5
IN
= 20V (a 4W pulse) for t = 10ms.
OUT
J
T
= 0V) current limit is less than the maximum current with normal
J(max).
OUT
as V
OUT
is varied, with the dropout warning occurring at
OUT
/V
REF
= (R1 + R2)/R2. For
MIC2954
Micrel