LP2951 ELECTRICAL CHARACTERISTICS (CONTINUED) Electrical Characteristics: Unless otherwise indicated, TA = +25°C Parameters Input Logic Voltage Note 1: 2: 3: 4: 5: 6: 7: 8: 9: Sym. Min. Typ. Max. Units Conditions — 1.3 — V LP2951-02 (±0.5%) — — 0.7 V Low 2.0 — — V High — 1.3 — V LP2951-03 (±1%) — — 0.7 V Low 2.0 — — V High — 1.3 — V LP2951-4.8 (±1%) — — 0.7 V Low 2.0 — — V High Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered in the specification for thermal regulation. Line regulation for the LP2951 is tested at 150°C for IL = 1 mA. For IL = 100 μA and TJ = 125°C, line regulation is guaranteed by design to 0.2%. See Typical Performance Characteristics for line regulation versus temperature and load current. Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential. At very low values of programmed output voltage, the minimum input supply voltage of 2V (2.3V over temperature) must be taken into account. 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 50 mA load pulse at VIN = 30V (1.25W pulse) for t = 10 ms. Comparator thresholds are expressed in terms of a voltage differential at the Feedback terminal 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 = 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 mV x 5V/1.235V = 384 mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed. VREF ≤ VOUT ≤ (VIN – 1 V), 2.3V ≤ VIN ≤ 30V, 100 μA < IL ≤ 100 mA, TJ ≤ TJMAX. Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT = 0, with Feedback pin tied to 5V Tap. DS20005736A-page 10 2017 Microchip Technology Inc.
