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LTC1844-2.8 Datasheet(PDF) 4 Page - Linear Technology |
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LTC1844-2.8 Datasheet(HTML) 4 Page - Linear Technology |
4 / 12 page 4 LTC1844 Series 1844ia ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT + 0.5V, unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS ILIM Output Current Limit q 160 350 mA en Output Voltage Noise f = 10Hz to 100kHz, CBP = 0.1µF, COUT = 1µF, IL = 150mA 35 µVRMS f = 10Hz to 100kHz, CBP = 0.1µF, COUT = 10µF, IL = 150mA 30 µVRMS VSHDN SHDN Input Threshold q 0.35 0.65 0.9 V tDELAY Shutdown Exit Delay CBP = 0.01µF, COUT = 1µF, No load 70 100 µs CBP = 0.01µF, COUT = 1µF, No load q 200 µs TSHDN Thermal Shutdown Limit 155 °C ∆TSHDN Thermal Shutdown Hysteresis 10 °C IADJ ADJ Pin Bias Current (Notes 3, 8) q 30 100 nA IIRL Input Reverse Leakage Current LTC1844-3.3, LTC1844-2.8, LTC1844-2.5, LTC1844-1.8, q 200 500 µA LTC1844-1.5, VIN = –5V, VOUT = 0V LTC1844-BYP, LTC1844-SD, VIN = –5V, VOUT = 0V q 1000 1500 µA IORL Output Reverse Leakage Current VIN = 0V, VOUT = VOUT(NOMINAL) 0.01 0.1 µA (Note 9) VIN = 0V, VOUT = VOUT(NOMINAL) q 1.2 µA VOSH Start-Up Overshoot RL = 1k, SHDN Rise Time ≤ 1µs2 %VOUT VRP Output Ripple Rejection (VIN – VOUT) = 1V (Avg), VRIPPLE = 0.5VP-P,60 dB fRIPPLE = 120Hz, ILOAD = 100mA Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1844 is tested and specified under pulse load conditions such that TJ ≈ TA. The LTC1844E is guaranteed to meet performance specifications from 0 °C to 70°C. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: The LTC1844 adjustable versions are tested and specifed for these conditions with the ADJ pin connected to the OUT pin for a VOUT(NOMINAL) of 1.252V. Note 4: Operating conditions are limited by maximum junction temperature. The regulated output voltage specification will not apply for all possible combinations of input voltage and output current. When operating at maximum input voltage, the output current range must be limited. When operating at maximum output current, the input voltage range must be limited. Note 5: The LTC1844’s high precision degrades slightly at high temperatures (TJ > 70°C) with input voltages below 2.2V. The lower output voltage versions have been split into higher and lower accuracy input voltage ranges to reflect this. Note 6: To ensure adequate input supply voltage, the LTC1844 adjustable versions are tested and specified for these conditions with an external resistor divider (two 100k resistors) for an output voltage of 2.504V. The external resistor divider will add a 5 µA load on the output. Note 7: Dropout voltage is (VIN – VOUT) when VOUT falls to 100mV below its nominal value measured at VIN = VOUT + 0.5V. For example, the LTC1844-3.3 is tested by measuring the VOUT at VIN = 3.8V, then VIN is lowered until VOUT falls 100mV below the measured value. The difference (VIN – VOUT) is then measured and defined as ∆VDO. Note 8: ADJ pin bias current flows into the ADJ pin. Note 9: Output reverse leakage current is tested with the IN pin grounded and the OUT pin forced to the rated output voltage. Note 10: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125 °C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. |
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