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LM25118-Q1 Fiches technique(PDF) 8 Page - Texas Instruments |
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LM25118-Q1 Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 43 page LM25118, LM25118-Q1 SNVS726D – JULY 2011 – REVISED AUGUST 2014 www.ti.com Electrical Characteristics (1) (continued) Unless otherwise specified, the following conditions apply: VIN = 24 V, VCCX = 0 V, EN = 5 V, RT = 29.11 k Ω, no load on LO and HO. (1) –40°C to +125°C TJ = 25°C PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNIT SOFT-START SS Current Source SS = 0 V 7.5 13.5 10.5 µA SS to FB Offset FB = 1.23 V 150 mV SS Output Low Voltage Sinking 100 µA, UVLO = 0 V 7 mV ERROR AMPLIFIER Measured at FB pin, VREF FB Reference Voltage 1.212 1.248 1.230 V FB = COMP FB Input Bias Current FB = 2 V 200 20 nA COMP Sink/Source Current 3 mA AOL DC Gain 80 dB fBW Unity Bain Bandwidth 3 MHz PWM COMPARATORS tHO(OFF) Forced HO Off-time 305 495 400 ns TON(MIN) Minimum HO On-time 70 ns COMP to Comparator Offset 200 mV OSCILLATOR (RT PIN) fSW1 Frequency 1 RT = 29.11 k Ω 178 224 200 kHz fSW2 Frequency 2 RT = 9.525 k Ω 450 575 515 kHz SYNC Sync threshold falling 1.3 V CURRENT LIMIT Cycle-by-cycle Sense Voltage VCS(TH) RAMP = 0 Buck Mode -103 -147 –125 mV Threshold (CS-CSG) Cycle-by-cycle Sense Voltage VCS(THX) RAMP = 0 Buck-Boost Mode -218 -300 –255 mV Threshold (CS-CSG) CS Bias Current CS = 0 V 60 45 µA CSG Bias Current CSG = 0 V 60 45 µA Current Limit Fault Timer 256 cycles RAMP GENERATOR IR2 RAMP Current 2 VIN = 12 V, VOUT = 12 V 95 135 115 µA IR3 RAMP Current 3 VIN = 5 V, VOUT = 12 V 65 95 80 µA VOUT Bias Current VOUT = 42 V 245 µA LOW SIDE (LO) GATE DRIVER VOLL LO Low-state Output Voltage ILO = 100 mA 0.095 0.23 0.14 V ILO = –100 mA VOHL LO High-state Output Voltage 0.25 V VOHL = VCC-VLO LO Rise Time C-load = 1 nF, VCC = 8 V 16 ns LO Fall Time C-load = 1 nF, VCC = 8 V 14 ns IOHL Peak LO Source Current VLO = 0 V, VCC = 8 V 2.2 A IOLL Peak LO Sink Current VLO = VCC = 8 V 2.7 A 8 Submit Documentation Feedback Copyright © 2011–2014, Texas Instruments Incorporated Product Folder Links: LM25118 LM25118-Q1 |
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