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LM10524 データシート(PDF) 8 Page - Texas Instruments |
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LM10524 データシート(HTML) 8 Page - Texas Instruments |
8 / 44 page LM10524 SNVS986A – AUGUST 2013 – REVISED JANUARY 2014 www.ti.com Buck 1 Electrical Characteristics (1) (2) (3) Unless otherwise noted, VVIN = 5.0V where: VVIN=VVIN_B1 = VVIN_B2 = VVIN_B3. The application circuit used is the one shown in “Typical Application Circuit". Limits in standard typeface are for TJ = 25°C. Limits in boldface type apply over the full 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 IOUT-MAX Continuous maximum load Buck 1 enabled, switching in PWM 1.6 A current(4)(5)(6) IPEAK Peak switching current limit Buck 1 enabled, switching in PWM 1.9 2.2 2.8 η Efficiency peak, Buck 1(4) IOUT = 0.3 A, VVIN = 3.3V 90 % FSW Switching Frequency 1.75 2 2.3 MHz CIN Input Capacitor(4) 0mA ≤ IOUT ≤ IOUT-MAX 4.7 µF COUT Output Filter Capacitor(4) 22 47 100 Output Capacitor ESR(4) 20 m Ω L Output Filter Inductance(4) 2.2 µH ∆VOUT DC Line regulation(4) 3.3V ≤ VVIN ≤ 5V, IOUT = IOUT-MAX 0.5 %/V DC Load regulation, PWM(4) VVIN=3.3V, 0.1 * IOUT-MAX ≤ IOUT ≤ 0.3 %/A IOUT-MAX IFB Feedback pin input bias VFB = 2.85V 2.3 5 µA current VFB Feedback Accuracy VFB = 2.85V -3 3 % RDS-ON-HS High Side Switch On 115 m Ω Resistance VVIN = 2.6V 190 RDS-ON-LS Low Side Switch On 60 110 Resistance RDS-ON-BYPASS Bypass FET on resistance Used in parallel with the high side FET while in Bypass mode. Resistance (DCR) of inductor = 100 m Ω VIN = 3.1V 75 m Ω VIN = 2.6V 120 Startup Tstart_NoLoad Internal soft-start (turn on Start up from shutdown, VOUT=0V, 0.1 ms time)(4) no load, LC = recommended circuit, using software enable, to VOUT = 95% of final value Tstart_FullLoad Internal soft-start (turn on Start up from shutdown, VOUT 0.5 time)(4) =0V, Maximum Load, LC = recommended circuit, using software enable, to 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) 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.) 8 Copyright © 2013–2014, Texas Instruments Incorporated Product Folder Links: LM10524 |
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