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LM2645MTD Fiches technique(PDF) 9 Page - National Semiconductor (TI) |
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LM2645MTD Fiches technique(HTML) 9 Page - National Semiconductor (TI) |
9 / 20 page Electrical Characteristics (Continued) Unless otherwise specified, V IN = 15V, SGND = PGND = 0V, VLIN5 = VDD1 = VDD2. Limits appearing in boldface type ap- ply over the entire operating junction temperature range, 0˚C to +125˚C. Specifications appearing in plain type are measured using low duty cycle pulse testing with T A = 25˚C (Note 5), (Note 6). Min/Max limits are guaranteed by design, test, or statisti- cal analysis. Symbol Parameter Conditions Min Typ Max Units SYSTEM V UVP FB1_FIX, FB2_FIX, LDOFB Undervoltage Protection Latch Threshold As a Percentage of nominal output voltage (Falling edge) 73 80 90 % Hysteresis 4% V UV_DELAY UV_DELAY Threshold Voltage (Note 10) 2.3 V I UV_DELAY UV_DELAY source current V UV_DELAY =2V 5µA V OVP V OUTx Overvoltage Protection Latch Threshold As a percentage measured at FB1_FIX, FB2_FIX 106 110 119 % TH LREG V OUTx Low Regulation Comparator Enable Threshold for channels 1 and 2 Falling Edge 95 % HYS LREG Hysteresis of Low Regulation Comparator As a Percentage of output voltage 3% V pwrbad Regulator Window Detector Thresholds (PGOOD from High to Low) (Note 11) As a Percentage of output voltage 86 91 94 % V pwrgd Regulator Window Detector Thresholds (PGOOD from Low to High) As a Percentage of output voltage 92.5 94 96.5 % TH VOX_DIS VO1, VO2 Quick Discharge Threshold (Note 12) 0.8 V V ox_R VO1,VO2 ON-Resistance VO1=VO2=2V 200 Ω Gate Drive I CBOOT CBOOT Leakage Current V CBOOT1 =VCBOOT2 =7V 100 nA I SC_DRV HDRVx and LDRVx Source Current V CBOOT1 =VCBOOT2 = 5V, VSWx=0V, HDRVx=LDRVx=2.5V 0.8 A I sk_HDRV HDRVx Sink Current V CBOOTx = VDDx = 5V, VSWx = 0V, HDRVX = 2.5V 1.3 A I sk_LDRV LDRVx Sink Current V CBOOTx = VDDx = 5V, VSWx = 0V, LDRVX = 2.5V 2.5 A R HDRV HDRV1 & 2 Source On-Resistance V CBOOT1 =VCBOOT2 = 5V, V SW1 =VSW2 =0V 2.2 Ω HDRV1 & 2 Sink On-Resistance 1.1 Ω R LDRV LDRV1 & 2 Source On-Resistance V CBOOT1 =VCBOOT2 = 5V, V SW1 =VSW2 =0V 2.2 Ω LDRV1 & 2 Sink On-Resistance 0.65 Ω www.national.com 9 |
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