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LM2748MTC Datasheet(PDF) 4 Page - Texas Instruments |
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LM2748MTC Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 37 page  LM2745, LM2748 SNOSAL2E – APRIL 2005 – REVISED APRIL 2013 www.ti.com Electrical Characteristics (continued) VCC = 3.3V unless otherwise indicated. Typicals and limits appearing in plain type apply for TA= TJ= 25°C. Limits appearing in boldface type apply over full Operating Temperature Range. Datasheet min/max specification limits are specified by design, test, or statistical analysis. Symbol Parameter Conditions Min Typ Max Units VEAO Error Amplifier Output Voltage Minimum 1 V Maximum 2.2 V GATE DRIVE IQ-BOOT BOOT Pin Quiescent Current VBOOT = 12V, VSD = 0 18 90 µA RHG_UP High-Side MOSFET Driver Pull-Up VBOOT = 5V @ 350 mA Sourcing 2.7 Ω ON resistance RHG_DN High-Side MOSFET Driver Pull-Down 350 mA Sinking 0.8 Ω ON resistance RLG_UP Low-Side MOSFET Driver Pull-Up VBOOT = 5V @ 350 mA Sourcing 2.7 Ω ON resistance RLG_DN Low-Side MOSFET Driver Pull-Down 350 mA Sinking 0.8 Ω ON resistance OSCILLATOR RFADJ = 750 kΩ 50 RFADJ = 100 kΩ 300 PWM Frequency RFADJ = 42.2 kΩ 475 600 725 fSW kHz RFADJ = 18.7 kΩ 1000 LM2745 External Synchronizing Voltage Swing = 0V to VCC 250 1000 Signal Frequency LM2745 Synchronization Signal Low SYNCL fSW = 250 kHz to 1 MHz 1 V Threshold LM2745 Synchronization Signal High SYNCH fSW = 250 kHz to 1 MHz 2 V Threshold DMAX Max High-Side Duty Cycle fSW = 300 kHz 86 fSW = 600 kHz 78 % fSW = 1 MHz 67 LOGIC INPUTS AND OUTPUTS VSTBY-IH Standby High Trip Point VFB = 0.575V, VBOOT = 3.3V 1.1 V VSD Rising VSTBY-IL Standby Low Trip Point VFB = 0.575V, VBOOT = 3.3V 0.232 V VSD Falling VSD-IH SD Pin Logic High Trip Point VSD Rising 1.3 V VSD-IL SD Pin Logic Low Trip Point VSD Falling 0.8 V VPWGD-TH-LO PWGD Pin Trip Points VFB Falling 0.408 0.434 0.457 V VPWGD-TH-HI PWGD Pin Trip Points VFB Rising 0.677 0.710 0.742 V VPWGD-HYS PWGD Hysteresis VFB Falling 60 mV VFB Rising 90 4 Submit Documentation Feedback Copyright © 2005–2013, Texas Instruments Incorporated Product Folder Links: LM2745 LM2748 |
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