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LM25574-Q1 Arkusz danych(PDF) 4 Page - Texas Instruments |
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LM25574-Q1 Arkusz danych(HTML) 4 Page - Texas Instruments |
4 / 29 page LM25574, LM25574-Q1 SNVS483G – JANUARY 2007 – REVISED APRIL 2013 www.ti.com Electrical Characteristics Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating Junction Temperature range. VIN = 24V, RT = 32.4kΩ unless otherwise stated. (1) Symbol Parameter Conditions Min Typ Max Units STARTUP REGULATOR VccReg Vcc Regulator Output 6.85 7.15 7.45 V Vcc LDO Mode turn-off 9 V Vcc Current Limit Vcc = 0V 25 mA VCC SUPPLY Vcc UVLO Threshold (Vcc increasing) 5.03 5.35 5.67 V Vcc Undervoltage Hysteresis 0.35 V Bias Current (Iin) FB = 1.3V 3.7 4.5 mA Shutdown Current (Iin) SD = 0V 48 70 µA SHUTDOWN THRESHOLDS Shutdown Threshold (SD Increasing) 0.47 0.7 0.9 V Shutdown Hysteresis 0.1 V Standby Threshold (Standby Increasing) 1.17 1.225 1.28 V Standby Hysteresis 0.1 V SD Pull-up Current Source 5 µA SWITCH CHARACTERSICS Buck Switch Rds(on) 750 1500 m Ω BOOST UVLO 4 V BOOST UVLO Hysteresis 0.56 V Pre-charge Switch Rds(on) 70 Ω Pre-charge Switch on-time 250 ns CURRENT LIMIT Cycle by Cycle Current Limit RAMP = 0V 0.6 0.7 0.8 A Cycle by Cycle Current Limit Delay RAMP = 2.5V 75 ns SOFT-START SS Current Source 7 10 14 µA OSCILLATOR Frequency1 180 200 220 kHz Frequency2 RT = 11kΩ 425 485 545 kHz SYNC Source Impedance 11 k Ω SYNC Sink Impedance 110 Ω SYNC Threshold (falling) 1.3 V SYNC Frequency RT = 11kΩ 550 kHz SYNC Pulse Width Minimum 15 ns RAMP GENERATOR Ramp Current 1 Vin = 36V, Vout=10V 272 310 368 µA Ramp Current 2 Vin = 10V, Vout=10V 36 50 64 µA PWM COMPARATOR Forced Off-time 416 500 575 ns Min On-time 80 ns COMP to PWM Comparator Offset 0.7 V (1) Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control (SQC) methods. Limits are used to calculate Texas Instruments' Average Outgoing Quality Level (AOQL). 4 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Product Folder Links: LM25574 LM25574-Q1 |
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Podobny opis - LM25574-Q1 |
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