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LM3488MMX Fiches technique(PDF) 3 Page - Texas Instruments |
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LM3488MMX Fiches technique(HTML) 3 Page - Texas Instruments |
3 / 33 page LM3488 LM3488-Q1 www.ti.com SNVS089M – JULY 2000 – REVISED MARCH 2013 Operating Ratings (1) Supply Voltage 2.97V ≤ VIN ≤ 40V Junction Temperature Range −40°C ≤ TJ ≤ +125°C Switching Frequency 100kHz ≤ FSW ≤ 1MHz (1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For specifications and test conditions, see the Electrical Characteristics. Electrical Characteristics Specifications in Standard type face are for TJ = 25°C, and in bold type face apply over the full Operating Temperature Range. Unless otherwise specified, VIN = 12V, RFA = 40kΩ Symbol Parameter Conditions Typical Limit Unit VFB Feedback Voltage VCOMP = 1.4V, 1.26 V 2.97 ≤ VIN ≤ 40V 1.2507/1.24 V(min) 1.2753/1.28 V(max) ΔVLINE Feedback Voltage Line Regulation 2.97 ≤ VIN ≤ 40V 0.001 %/V ΔVLOAD Output Voltage Load Regulation IEAO Source/Sink ±0.5 %/V (max) VUVLO Input Undervoltage Lock-out 2.85 V 2.97 V(max) VUV(HYS) Input Undervoltage Lock-out Hysteresis 170 mV 130 mV (min) 210 mV (max) Fnom Nominal Switching Frequency RFA = 40KΩ 400 kHz 360 kHz(min) 430 kHz(max) RDS1 (ON) Driver Switch On Resistance (top) IDR = 0.2A, VIN= 5V 16 Ω RDS2 (ON) Driver Switch On Resistance (bottom) IDR = 0.2A 4.5 Ω VDR (max) Maximum Drive Voltage Swing(1) VIN < 7.2V VIN V VIN ≥ 7.2V 7.2 Dmax Maximum Duty Cycle(2) 100 % Tmin (on) Minimum On Time 325 nsec 230 nsec(min) 550 nsec(max) ISUPPLY Supply Current (switching) (3) 2.7 mA 3.0 mA (max) IQ Quiescent Current in Shutdown Mode VFA/SYNC/SD = 5V (4), V IN = 5V 5 µA 7 µA (max) VSENSE Current Sense Threshold Voltage VIN = 5V 156 mV 135/ 125 mV (min) 180/ 190 mV (max) VSC Short-Circuit Current Limit Sense VIN = 5V 343 mV Voltage 250 mV (min) 415 mV (max) VSL Internal Compensation Ramp Voltage VIN = 5V 92 mV 52 mV(min) 132 mV(max) VSL ratio VSL/VSENSE 0.49 0.30 (min) 0.70 (max) VOVP Output Over-voltage Protection (with VCOMP = 1.4V 50 mV respect to feedback voltage) (5) 32/ 25 mV(min) 78/ 85 mV(max) (1) The voltage on the drive pin, VDR is equal to the input voltage when input voltage is less than 7.2V. VDR is equal to 7.2V when the input voltage is greater than or equal to 7.2V. (2) The limits for the maximum duty cycle can not be specified since the part does not permit less than 100% maximum duty cycle operation. (3) For this test, the FA/SYNC/SD Pin is pulled to ground using a 40K resistor . (4) For this test, the FA/SYNC/SD Pin is pulled to 5V using a 40K resistor. (5) The over-voltage protection is specified with respect to the feedback voltage. This is because the over-voltage protection tracks the feedback voltage. The over-voltage thresold can be calculated by adding the feedback voltage, VFB to the over-voltage protection specification. Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM3488 LM3488-Q1 |
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