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LM10504 データシート(PDF) 6 Page - Texas Instruments |
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LM10504 データシート(HTML) 6 Page - Texas Instruments |
6 / 38 page LM10504 SNVS739E – DECEMBER 2011 – REVISED MARCH 2013 www.ti.com Buck 1 Electrical Characteristics (1)(2)(3) (continued) Unless otherwise noted, VIN = 5.0V where: VIN=VIN_B1 = VIN_B2 = VIN_B3. Limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type apply over the entire operating junction temperature range of −30°C ≤ TA = TJ ≤ +85°C. Symbol Parameter Conditions Min Typ Max Units FSW Switching frequency 1.75 2 2.3 MHz CIN Input capacitor (4) 4.7 µF Output filter capacitor (4) 10 10 100 COUT 0mA ≤ IOUT ≤ IOUT-MAX Output capacitor ESR (4) 20 m Ω L Output filter inductance (4) 2.2 µH DC line regulation (4) 3.3V ≤ VIN ≤ 5.0V, IOUT = IOUT-MAX 0.5 %/V ΔVOUT DC load regulation (4) 100 mA ≤ IOUT ≤ IOUT-MAX 0.3 %/A IFB Feedback pin input bias current VFB = 3.0V 2.1 5 µA 135 RDS-ON-HS High side switch on resistance m Ω VIN = 2.6V 215 RDS-ON-LS Low side switch on resistance 85 190 m Ω Used in parallel with the high side FET while in Bypass mode. Resistance (DCR) of inductor = 100 m Ω RDS-ON-BYPASS Bypass FET on resistance VIN = 3.3V 85 m Ω VIN = 2.6V 120 STARTUP Startup from shutdown, VOUT = 0V, no load, LC = recommended circuit, using TSTART Internal soft-start (turn on time) (4) 0.1 ms software enable, to VOUT = 95% of final value Buck 2 Electrical Characteristics (1) (2) (3) Unless otherwise noted, VIN = 5.0V where: VIN=VIN_B1 = VIN_B2 = VIN_B3. Limits appearing in normal type apply for TJ = 25°C. Limits appearing in boldface type apply over the entire operating junction temperature range of −30°C ≤ TA = TJ ≤ +85°C. Symbol Parameter Conditions Min Typ Max Units IQ VIN DC bias current No Load, PFM Mode 15 50 µA Continuous maximum load current IOUT_MAX Buck 2 enabled, switching in PWM 1.0 A (4) (5) (6) IPEAK Peak switching current limit Buck 2 enabled, switching in PWM 1.35 1.56 1.8 A η Peak efficiency (4) IOUT = 0.3A 90 % FSW Switching frequency 1.75 2 2.3 MHz CIN Input capacitor (4) 4.7 µF Output filter capacitor (4) 10 10 100 COUT 0mA ≤ IOUT ≤ IOUT-MAX Output capacitor ESR (4) 20 m Ω L Output filter inductance (4) 2.2 µH DC line regulation (4) 3.3V ≤ VIN ≤ 5.0V, IOUT = IOUT-MAX 0.5 %/V ΔVOUT DC load regulation (4) 100 mA ≤ IOUT ≤ IOUT-MAX 0.3 %/A (1) All limits are ensured by design, test and/or statistical analysis. 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) Capacitors: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) are used in setting electrical characteristics. (3) BUCK normal operation is ensured if VIN ≥ VOUT+1.0V. (4) Specification ensured by design. Not tested during production. (5) In applications where high power dissipation and/or poor thermal resistance is present the maximum ambient temperature may have to be derated. Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP = +125°C), the maximum power dissipation of the device in the application (PD-MAX), and the junction-to-ambient thermal resistance of the part/package in the application ( θJA), as given by the following equation: TA-MAX = TJ-MAX-OP – (θJA × PD-MAX). (6) The amount of Absolute Maximum power dissipation allowed for the device depends on the ambient temperature and can be calculated using the formula: P = (TJ–TA)/θJA, where TJ is the junction temperature, TA is the ambient temperature, and θJA is the junction-to- ambient thermal resistance. θJA is highly application and board-layout dependent. Internal thermal shutdown circuitry protects the device from permanent damage. (See General Electrical Characteristics.) 6 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Product Folder Links: LM10504 |
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