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LM21305 Datasheet(PDF) 5 Page - Texas Instruments |
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LM21305 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 34 page  LM21305 www.ti.com SNVS639F – DECEMBER 2009 – REVISED MARCH 2013 Electrical Characteristics (1) (2)(2) (continued) Specifications with standard typeface are for TJ = 25°C, and those in boldface type apply over the full Operating Temperature Range (TJ = -40°C to +125°C). Unless otherwise specified, VIN = VPVIN = VAVIN = 12V, VOUT = 3.3V, IOUT = 0A. Symbol Parameter Remarks Min Typ Max Unit VUVLO-HI-AVIN AVIN UVLO Rising Threshold 2.84 2.93 2.987 V VUVLO-LO-AVIN AVIN UVLO Falling Threshold 2.66 2.73 2.83 V VUVLO-HYS-AVIN AVIN UVLO Hysteresis Window 195 mV V5V0 Internal LDO1 Output Voltage Measured at 5V0 pin, 1k Ω load 4.88 V Recommended Capacitance COUT-CAP-5V0 Ceramic capacitor 1 µF connected to 5V0 pin ISHORT-5V0 Short Circuit Current of 5V0 pin 31 mA V2V5 Internal LDO2 output voltage Measured at 2V5 pin, 1k Ω load 2.47 V Recommended Capacitance Ceramic capacitor COUT-CAP-2V5 100 nF connected to 2V5 pin ISHORT-2V5 Short Circuit Current of 2V5 pin 47 mA Measured between 5V0 and VFCBOOT-D CBOOT Diode Forward Voltage 0.76 V CBOOT @ 10 mA ICBOOT CBOOT Leakage Current VCBOOT = 5.5V, not switching 0.65 µA Startup Time from EN high to TSTARTUP-DELAY the beginning of internal soft- 160 µs start SS Internal Soft-Start 10% to 90% VFB 1.41 2.7 4.15 ms OSCILLATOR Oscillator Frequency, nominal FOSC-NOM RFRQ = 61.9 kΩ, 0.025% 695 750 795 kHz measured at SW pin Maximum Oscillator Frequency FOSC-MAX RFRQ = 28.4 kΩ 1500 kHz measured at SW pin Minimum Oscillator Frequency FOSC-MIN RFRQ = 167.5 kΩ 300 kHz measured at SW pin Minimum Off-Time measured at fS = 1.5 MHz, VIN = 3.3V, VFB = TOFF-MIN 50 ns SW pin 1V, voltage divider ratio = 3.3 Minimum On-Time measured at fS = 1.5 MHz, voltage divider TON-MIN 70 ns SW pin ratio = 1 LOGIC VIH-EN EN Pin Rising Threshold 1.1 1.2 1.3 V VHYST-EN EN Pin Hysteresis Window 130 200 302 mV IEN-IN EN Pin Input Current VEN = 12V 18 23 µA VIH-UV-PGOOD PGOOD UV Rising Threshold Percentage of VOUT 87.5 93 97.5 % PGOOD UV Hysteresis VHYST-UV-PGOOD Percentage of VOUT -4.2 % Threshold IOL- PGOOD PGOOD Sink Current VOL = 0.2V 3 mA IOH- PGOOD PGOOD Leakage Current VOH = 18V 460 nA THERMAL SHUTDOWN TSD Thermal Shutdown (4) 160 °C Thermal Shutdown Hysteresis TSD-HYS 10 °C (4) (4) Specified by design. Copyright © 2009–2013, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM21305 |
Similar Part No. - LM21305_14 |
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Similar Description - LM21305_14 |
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