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LP3923 数据表(PDF) 11 Page - Texas Instruments |
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LP3923 数据表(HTML) 11 Page - Texas Instruments |
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11 / 37 page  LP3923 www.ti.com SNVS567B – APRIL 2010 – REVISED MAY 2013 LDO5, LDO6, LDO7 (A-Type) Electrical Characteristics (continued) Unless otherwise noted, VIN=VIN2=BATT=3.6V, GND = 0V, CV!N1-2 = 10 µF, CLDOx= 1 µF, RX_EN, TX_EN high. Note VINMIN is the greater of 3.0V or VOUT +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 Conditions Typical Units Min Max tSTART-UP Start-Up Time from Shut-down COUT = 1 µF, IOUT = 150 mA (2) 35 µs TTransient Start-Up Transient Overshoot COUT = 1 µF, IOUT = 150 mA (2) 30 mV LDO8 (D-Type) Electrical Characteristics Unless otherwise noted, VIN=VIN2=BATT=3.6V, GND = 0V, CV!N1-2 = 10 µF, CLDOx= 1 µF. Note VINMIN is the greater of 3.0V or VOUT +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 Conditions Typical Units Min Max VOUT Output Voltage Accuracy IOUT = 1 mA, VOUT = 3.0V −2 +2 % −3 +3 Default Output Voltage 3.0 V IOUT Output Current VINMIN ≤ VIN ≤ 5.5V 150 mA Output Current Limit VOUT = 0V 400 VDO Dropout Voltage IOUT = 150 mA (2) (3) 125 140 mV ΔVOUT Line Regulation VINMIN ≤ VIN ≤ 5.5V, IOUT = 1 mA 2 mV Load Regulation 1 mA ≤ IOUT ≤ 150 mA 5 eN Output Noise Voltage 10 Hz ≤ f ≤ 100 kHz, COUT = 1 µF (2) 35 µVRMS PSRR Power Supply Ripple Rejection F = 10 kHz, COUT = 1 µF, IOUT = 20 mA (2) 60 dB Ratio tSTART-UP Start-Up Time from Shut-down COUT = 1 µF, IOUT = 150 mA (2) 35 µs TTransient Start-Up Transient Overshoot COUT = 1 µF, IOUT = 150 mA (2) 30 mV (1) All limits are specified. All electrical characteristics having room-temperature limits are tested during production with TJ = 25°C. All hot and cold limits are ensured by correlating the electrical characteristics to process and temperature variations and applying statistical process control. (2) Ensured by design. (3) 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 2.5V 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. Buck Converter Electrical Characteristics Unless otherwise noted, VIN = VINB = 3.6V, GND = 0V, CVINB = 10 µF. 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) (2) Limit Symbol Parameter Conditions Typ Units Min Max VFB Feedback Voltage (BUCK) 3.0V ≤VIN≤ 5.5V 0.5 0.485 0.515 V VOUT,PWM Output Voltage 3.0V ≤VIN≤ 5.5V, IOUT = 150mA External resistor divider 1.8 1.746 1.854 V accuracy not considered. RFB1=390kΩ RFB2=150kΩ (3) (1) All limits are specified. All electrical characteristics having room-temperature limits are tested during production with TJ = 25°C. All hot and cold limits are ensured by correlating the electrical characteristics to process and temperature variations and applying statistical process control. (2) Buck output voltage accuracy depends on the accuracy of the external feedback resistors. Resistor values should be chosen for the divider network to ensure that at the desired output voltage the FB pin is at the specified value of 0.5V. See Buck Converter Application Information. (3) Ensured by design. Copyright © 2010–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LP3923 |
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