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LP2951-50QDRGRQ1 Datasheet(PDF) 4 Page - Texas Instruments |
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LP2951-50QDRGRQ1 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 24 page LP2951-33-Q1 LP2951-50-Q1 SLVSAW6D – JUNE 2011 – REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS (continued) VIN = VOUT (nominal) + 1 V, IL = 100 μA, CL = 1 μF (5-V versions) or CL = 2.2 μF (3.3-V versions), 8-pin version: FEEDBACK tied to VTAP, OUTPUT tied to SENSE, VSHUTDOWN ≤ 0.7 V PARAMETER TEST CONDITIONS TA MIN TYP MAX UNIT Thermal regulation(4) IL = 100 μA 25°C 0.05 0.2 %/W CL = 1 μF (5 V only) 430 Output noise (RMS), CL = 200 μF 160 25°C μV 10 Hz to 100 kHz LP2951-50-Q1: CL = 3.3 μF, 100 CBypass = 0.01 μF between pins 1 and 7 VOUT = VREF to (VIN – 1 V), Reference voltage VIN = 2.3 V to 30 V, –40°C to 125°C 1.200 1.272 V IL = 100 μA to 100 mA Reference voltage temperature 25°C 20 ppm/°C coefficient(1) ERROR COMPARATOR 25°C 0.01 1 Output leakage current VOUT = 30 V μA –40°C to 125°C 2 25°C 150 250 VIN = VOUT(NOM) – 0.5 V, Output low voltage mV IOL = 400 μA –40°C to 125°C 400 25°C 40 60 Upper threshold voltage mV (ERROR output high)(5) –40°C to 125°C 25 25°C 75 95 Lower threshold voltage mV (ERROR output low)(5) –40°C to 125°C 140 Hysteresis(5) 25°C 15 mV SHUTDOWN INPUT Low (regulator ON) 0.7 Input logic voltage –40°C to 125°C V High (regulator OFF) 2 25°C 30 50 VTAP = 2.4 V –40°C to 125°C 100 SHUTDOWN input current μA 25°C 450 600 VTAP = 30 V –40°C to 125°C 750 VSHUTDOWN ≥ 2 V, 25°C 3 10 Regulator output current VIN ≤ 30 V, VOUT = 0, μA in shutdown –40°C to 125°C 20 FEEDBACK tied to VTAP (4) 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 = 30 V, VOUT = 5 V (1.25-W pulse) for t = 10 ms. (5) Comparator thresholds are expressed in terms of a voltage differential equal to the nominal reference voltage (measured at VIN – VOUT = 1 V) minus FEEDBACK terminal voltage. 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 5 V, the ERROR output is specified to go low when the output drops by 95 mV × 5 V/1.235 V = 384 mV. Thresholds remain constant as a percentage of VOUT (as VOUT is varied), with the low-output warning occurring at 6% below nominal (typ) and 7.7% (max). 4 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Product Folder Links: LP2951-33-Q1 LP2951-50-Q1 |
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