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LM10502 データシート(PDF) 6 Page - Texas Instruments |
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LM10502 データシート(HTML) 6 Page - Texas Instruments |
6 / 35 page LM10502 SNVS884B – AUGUST 2012 – REVISED MAY 2013 www.ti.com Buck 1 Electrical Characteristics (1) (2) (3) Unless otherwise noted, VIN = 5.0V where: VIN=VVIN_B1 = VVIN_B2. L1 = 2.2µH,C3=C5=22µF,C2=C4=4.7µF. The application circuit used is the one shown in "Typical Application Circuit." Limits in standard typeface are 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 DC Bias Current in VIN No Load, PFM Mode 15 50 µA Continuous load current((4) IOUT-MAX Buck 1 enabled switching in PWM 1.0 (5) (6) (7)) IPEAK Peak switching current limit Buck 1 enabled, switching in PWM 1.3 1.575 1.85 A η Efficiency peak, Buck 1(5) IOUT = 0.3A, VIN = 5.0V 90 % FSW Switching Frequency 1.75 2 2.3 MHz CIN Input Capacitor(5) 4.7 µF Output Filter Capacitor(5) 10 22 100 COUT 0mA ≤ IOUT ≤ -IOUT-MAX Output Capacitor ESR(5) 20 m Ω L Output Filter Inductance(5) 2.2 µH VFB Feedback Voltage VOUT = 1.8V (Default) PWM Mode,No Load -3 3 % DC Line regulation(5) 3.3V ≤ VIN ≤ 5.0V, IOUT-MAX 0.5 %/V ΔVOUT DC Load regulation(5) 100mA ≤ IOUT-MAX 0.3 %/A Feedback pin input bias IFB VFB = 1.8V 2.4 5 µA current VIN = 5.0V 140 High Side Switch On RDS-ON-HS m Ω Resistance VIN = 2.6V 220 Low Side Switch On RDS-ON-LS VIN = 5.0V 70 150 m Ω Resistance STARTUP Startup from shutdown, VOUT = 0V, no load, LC = Internal soft-start (turn on TSTART recommended circuit, using software enable, to 0.1 ms time)(5) VOUT = 95% of final value (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) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is ensured. Operating Ratings do not imply ensured performance limits. For ensured performance limits and associated test conditions, see the General Electrical Characteristics. (5) Specification ensured by design. Not tested during production. (6) 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). (7) 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 © 2012–2013, Texas Instruments Incorporated Product Folder Links: LM10502 |
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