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LM73605RNPR Datasheet(PDF) 11 Page - Texas Instruments |
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LM73605RNPR Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 53 page  REF PVIN BIAS PGOOD ENABLE CONTROL LOGIC AGND PGND Oscillator LDO SYNC/ MODE VCC SW FB HS I Sense EA RT UVLO Hiccup Detector Internal SS OV/UV Detector + PFM Detector Slope Comp + ± Precision Enable LS I Sense PGood FB RC CC ISSC ICMD ILIMIT + ± VCC CLK FPWM TSD VBOOT VBOOT UVLO SS/TRK Copyright © 2017, Texas Instruments Incorporated CBOOT VSW VSW 11 LM73605, LM73606 www.ti.com SNVSAH5 – SEPTEMBER 2017 Product Folder Links: LM73605 LM73606 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The LM73605/6 is an easy-to-use synchronous step-down DC-DC converter that operates from a 3.5-V to 36-V supply voltage. It is capable of delivering up to 5-A (LM73605) or 6-A (LM73606) DC load current with exceptional efficiency and thermal performance in a very small solution size. The LM73605/6 employs fixed-frequency peak current-mode control with configurable auto or FPWM operation mode. Auto mode provides very high efficiency at light loads, and FPWM mode maintains constant switching frequency over entire load range. The device is internally compensated, which reduces design time and the number of external components. The switching frequency is programmable from 350 kHz to 2.2 MHz by an external resistor. The LM73605/6 can also synchronize to an external clock within the same frequency range. The wide switching frequency range allows the device to be optimized for a wide range of system requirements. It can be optimized for small solution size with higher frequency; or for high efficiency with lower switching frequency. The LM73605/6 has very low quiescent current, which is critical for battery operated systems. It allows for a wide range of voltage conversion ratios due to very small minimum ON-time (tON_MIN) and minimum OFF-time (tOFF_MIN). Automated frequency foldback is employed at very high or low duty cycles to further extend the operating range. The LM73605/6 also features a power-good (PGOOD) flag, precision enable, internal or adjustable soft start, pre-biased start-up, and output voltage tracking. Protection features include thermal shutdown, undervoltage lockout (UVLO), cycle-by-cycle current limiting, and short-circuit hiccup protection. It provides flexible and easy- to-use solutions for a wide range of applications. The family requires very few external components and has a pin out designed for simple, optimum PCB layout for enhanced EMI and thermal performance. The LM73605/6 device is available in a 30-pin WQFN leadless package. 7.2 Functional Block Diagram |
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