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LP38851SX-ADJ Datasheet(PDF) 4 Page - Texas Instruments |
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LP38851SX-ADJ Datasheet(HTML) 4 Page - Texas Instruments |
4 / 29 page LP38851 SNVS492C – JUNE 2007 – REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS Unless otherwise specified: VOUT = 0.80V, VIN = VOUT(NOM) + 1V, VBIAS = 3.0V, VEN = VBIAS, IOUT = 10 mA, CIN = COUT = 10 µF, CBIAS = 1 µF, CSS = open. Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Symbol Parameter Conditions Min Typ Max Units VOUT(NOM)+1V ≤ VIN ≤ VBIAS ≤ 4.5V (1) 492.5 507.5 3.0V ≤ VBIAS ≤ 5.5V, 500. 485.0 515.0 10 mA ≤ IOUT ≤ 800 mA VADJ VADJ Accuracy mV VOUT(NOM)+1V ≤ VIN ≤ VBIAS ≤ 4.5V (1) 3.0V ≤ VBIAS ≤ 5.5V, 490.0 500. 510.0 10 mA ≤ IOUT ≤ 800 mA, 0°C ≤ TJ ≤ +125°C 3.0V ≤ VBIAS ≤ 5.5V 0.80 1.20 VOUT VOUT Range V 4.5V ≤ VBIAS ≤ 5.5V 0.80 1.80 ΔVOUT/ΔVIN Line Regulation, VIN (2) VOUT(NOM)+1V ≤ VIN ≤ VBIAS - 0.04 - %/V ΔVOUT/ΔVBIAS Line Regulation, VBIAS (2) 3.0V ≤ VBIAS ≤ 5.5V - 0.10 - %/V ΔVOUT/ΔIOUT Output Voltage Load Regulation (3) 10 mA ≤ IOUT ≤ 800 mA - 0.2 - %/A 150 VDO Dropout Voltage (4) IOUT = 800 mA - 115 mV 200 VOUT = 0.80V 8.5 VBIAS = 3.0V - 7.0 mA 9.0 Quiescent Current Drawn from VIN 10 mA ≤ IOUT ≤ 800 mA IGND(IN) Supply 100 VEN ≤ 0.5V 1 μA 300 3.8 10 mA ≤ IOUT ≤ 800 mA - 3.0 mA 4.5 Quiescent Current Drawn from IGND(BIAS) VBIAS Supply 170 VEN ≤ 0.5V 100 μA 200 2.20 2.70 UVLO Under-Voltage Lock-Out Threshold VBIAS rising until device is functional 2.45 V 2.00 2.90 VBIAS falling from UVLO threshold until 60 300 UVLO(HYS) Under-Voltage Lock-Out Hysteresis 150 mV device is non-functional 50 350 VIN = VOUT(NOM) + 1V, ISC Output Short-Circuit Current - 2.3 - A VBIAS = 3.0V, VOUT = 0.0V Soft-Start rSS Soft-Start internal resistance 11.0 14.0 17.0 k Ω Soft-Start time tSS CSS = 10 nF - 700 - μs tSS = CSS × rSS × 5 Enable VEN = VBIAS - 0.01 - IEN ENABLE pin Current μA -24 -43 VEN = 0.0V, VBIAS = 5.5V -35 -21 -50 1.00 1.50 VEN(ON) Enable Voltage Threshold VEN rising until Output = ON 1.25 V 0.90 1.55 VEN falling from VEN(ON) until Output = 50 150 VEN(HYS) Enable Voltage Hysteresis 100 mV OFF 30 200 tOFF Turn-OFF Delay Time RLOAD x COUT << tOFF - 20 - µs tON Turn-ON Delay Time RLOAD x COUT << tON - 15 - AC Parameters (1) VIN cannot exceed either VBIAS or 4.5V, whichever value is lower. (2) Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage. (3) Output voltage load regulation is defined as the change in output voltage from nominal value as the load current increases from no load to full load. (4) Dropout voltage is defined as the input to output voltage differential (VIN - VOUT) where the input voltage is low enough to cause the output voltage to drop 2% from the nominal value. 4 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Product Folder Links: LP38851 |
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