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LP3921 Datasheet(PDF) 10 Page - Texas Instruments |
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LP3921 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 41 page  LP3921 SNVS580A – AUGUST 2008 – REVISED MAY 2013 www.ti.com LDO2 (DIGI) Electrical Characteristics (continued) Unless otherwise noted, VIN (=VIN1=VIN2=BATT=VDD) = 3.6V, GND = 0V, CVIN1-2=10 µF, CLDOX=1 µF. Note VINMIN is the greater of 3.0V or VOUT2+ 0.5V. Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type apply over the entire junction temperature range for operation, TA = TJ = −40°C to +125°C. (1) Limit Symbol Parameter Condition Typ Units Min Max tSTART-UP Start-Up Time from COUT = 1 µF, IOUT2 = 300 mA (3) 40 60 µs Shutdown tTransient Start-Up Transient COUT = 1 µF, IOUT2 = 300 mA (3) 5 30 mV Overshoot LDO3 (ANA), LDO4 (TCXO) Electrical Characteristics Unless otherwise noted, VIN (=VIN1=VIN2=BATT=VDD) = 3.6V, GND = 0V, CVIN1-2=10 µF, CLDOX=1 µF. TCXO_EN high. Note VINMIN is the greater of 3.0V or VOUT3/4 + 0.5V. Typical values and limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type apply over the entire junction temperature range for operation, TA = TJ = −40°C to +125°C. (1) Limit Symbol Parameter Condition Typ Units Min Max VOUT3, VOUT4 Output Voltage IOUT3/4 = 1 mA, VOUT3/4= 3.0V −2 +2 % Accuracy −3 +3 Output Voltage LDO3 default 3 V LDO4 default 3 IOUT3, IOUT4 Output Current VINMIN ≤ VIN ≤ 5.5V 80 mA Output Current Limit VOUT3/4 = 0V 160 VDO3, VDO4 Dropout Voltage IOUT3/4 = 80 mA (2) 220 310 mV ΔVOUT3 , ΔVOUT4 Line Regulation VINMIN ≤ VIN ≤ 5.5V 2 mV IOUT3/4 = 1 mA Load Regulation 1mA ≤ IOUT3/4 ≤ 80 mA 5 mV en3,en4 Output Noise Voltage 10 Hz ≤ f ≤ 100 kHz, 45 µVRMS COUT = 1 µF (3) PSRR Power Supply F = 10 kHz, COUT = 1 µF 65 dB Rejection Ratio IOUT3/4 = 20 mA (3) tSTART-UP Start-Up Time from COUT = 1 µF, IOUT3/4 = 80mA 40 60 µs Enable(3) tTransient Start-Up Transient COUT = 1µF, IOUT3/4 = 80 mA 5 30 mV Overshoot (3) (1) All limits are verified. All electrical characteristics having room-temperature limits are tested during production with TJ = 25°C. All hot and cold limits are specified by correlating the electrical characteristics to process and temperature variations and applying statistical process control. (2) Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This specification does not apply in cases it implies operation with an input voltage below the 3.0V minimum appearing under Operating Ratings. For example, this specification does not apply for devices having 1.5V outputs because the specification would imply operation with an input voltage at or about 1.5V. (3) Specified by design. 10 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Product Folder Links: LP3921 |
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