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QFBR-2576 Datasheet
Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sec- tions of this specification is not implied. Exposure to absolute maximum rating conditions for external periods may affect device reliability. * Allvoltages values are referred to Vss pin vokage.
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When the overload condition forces the output voltage to drop the maximum current delivered falls from approximately l.9 amps to less than l.5 amps. This feature keeps the short circuit dissipation low and forces the output voltage to collapse rapidly thereby preventing operation in an abnormal condition. Combined with the "Power Ready" signal (see below), this foldback of the output current prevents power cycling of the downstream converters.
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SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VoS Input Offset Voltage (Note 4) TA = OIC t0 70rC TA = -40rC t0 85rC q q 0.2 1.5 2.0 3.0 mV mV mV
Input Offset Voltage (Low Power Mode) (Note 10) LT1815S6/LT1816A, 40k ] Between ISET and V- TA = OIC t0 70rC TA = -40rC t0 85rC q q 2 7 9 10 mV mV mV
o\/os Input Offset Voltage Drift TA = OIC t0 70rC (Note 7) TA = -40rC t0 85rC (Note 7) q q 1 0 15 1 0 30 ][C ][C
10s Input Offset Current TA = OIC t0 70rC TA = -40rC t0 85rC q q 60 800 1000 1200 nA nA nA
lB Input Bias Current TA = OIC t0 70rC TA = -40rC t0 85rC q q -2 +8 ±10 +12 c cct\
en Input Noise Voltage Density f= lOkHz 6 nWfjrlz
In Input Noise Current Density f= lOkHz 1.3 pA/trjrlz
RIN Input Resistance VCM = +3.5V Differential 1.5 5 750 l
CIN Input Capacitance 2 pF
VCM Input Voltage Range Guaranteed by CMRR TA = -40rC t0 85rC q +3.5 V V
CMRR Common Mode Rejection Ratio VCM = +3.5V TA = OIC t0 70rC TA = -40rC t0 85rC q q 75 85 73 72 dB dB dB
Minimum Supply Voltage Guaranteed by PSRR TA = -40rC t0 85rC q +1.25 +2 +2 V V
PSRR Power Supply Rejection Ratio Vs = +2V to +5.5V TA = OIC t0 70rC TA = -40rC t0 85rC q q 78 97 76 75 dB dB dB
Channel Separation VOUT = +3V, RL = ioo I , LT1 81 6/LT1 817 TA = OIC t0 70rC TA = -40rC t0 85rC q q 82 1 00 81 80 dB dB dB
AVOL Large-Signal Voltage Gain VOUT = +3V, RL = sool TA = OIC t0 70rC TA = -40rC t0 85rC q q 1.5 3 1.0 0.8 \//mV \!lmV \!lmV
VOUT = +3V, RL = iool TA = OIC t0 70rC TA = -40rC t0 85rC q q 0.7 2.5 0.5 0.4 \!lmV \UmV \//mV
VOUT Maximum Output Swing RL = soo I , 30mV Overdrive TA = OIC t0 70rC TA = -40rC t0 85rC q q +3.7 +3.6 V V V
RL = ioo I , 30mV Overdrive TA = OIC t0 70rC TA = -40rC t0 85rC q q +3.50 +3.8 +3.25 +3.15 V V V


Pha III III III III III se Negative Syne I I I ri li. N 9yat/ I lA I VJ- -Ph oos ase tive
_____l l l Gain Posil ive Syne
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