LM2950 Просмотр технического описания (PDF) - HTC Korea

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LM2950

100mA LOW DROPOUT VOLTAGE REGULATORS

HTC Korea 

100mA LOW DROPOUT VOLTAGE REGULATORS

LM2950/1

Note 1 : Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.

Note 2 : Unless otherwise specified all limits guaranteed for TJ = 25℃, VIN = V0+1V, IL = 100㎂ and CL = 1㎌. Additional condition for the 8-pin

versions are feedback tied to -XX V tap and output tied to output Sense (VOUT=XX V) and VSHOUTDOWN≤0.8V

Note 3 : Regulations is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due

to heating effects are covered under the specification for thermal regulation.

Note 4 : Dropout voltage is defined as the input to output differential at which the output voltage drops 100㎷ below its nominal value measured

at 1V differential. At very low values of programmed output voltage, the minimum input supply voltage(2.3V over temperature)

must be taken into account.

Note 5 : VREF≤VOUT≤(VIN-1V), 2.3V≤VIN≤30V, 100㎂≤IL≤100㎃, TJ≤TJMAX

Note 6 : Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage

measured at VOUT+1V input. To express these thresholds in terms of output voltage changed,

multiply by the error amplifier gain = VOUT/VREF = (R1+R2)/R2. For example, at a programmed output voltage of 5V, the error output is

guaranteed to go low when the output drops by 95㎷ x 5V / 1.235V = 384㎷. Thresholds remain constant as a percent VOUT as VOUT is

varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.

Note 7 : VSHUTDOWN≥2V, VIN≤30V, VOUT=0, Feed-back pin tied to -XX V Tap.

Feb 2009 - Rev. 1.2

−4−

HTC

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