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LM2745 датащи(PDF) 1 Page - Texas Instruments |
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LM2745 датащи(HTML) 1 Page - Texas Instruments |
1 / 37 page HG BOOT ISEN LG PGND FB VCC SD PWGD FREQ/SYNC SS/TRACK SGND EAO PGND VCC = 3.3V VIN = 3.3V VOUT = 1.2V@16A RFB2 CC2 RC1 RCS CSS RCC CCC D1 CBOOT Q1 CIN1,2 L1 + CC1 RFB1 CO1,2 LM2745 RC2 CC3 RPULL-UP RFADJ CClk Clk Q2 + LM2745, LM2748 www.ti.com SNOSAL2E – APRIL 2005 – REVISED APRIL 2013 LM2745 / LM2748 Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock Synchronization Check for Samples: LM2745, LM2748 1 FEATURES DESCRIPTION The LM2745/8 are high-speed synchronous buck 2 • Switching Frequency from 50 kHz to 1 MHz regulator controllers with an accurate feedback • Switching Frequency Synchronize Range 250 voltage accuracy of ±1.5%. It can provide simple kHz to 1 MHz (LM2745 Only) down conversion to output voltages as low as 0.6V. • Startup with a Pre-biased Output Load Though the control sections of the IC are rated for 3 to 6V, the driver sections are designed to accept • Power Stage Input Voltage from 1V to 14V input supply rails as high as 14V. The use of adaptive • Control Stage Input Voltage from 3V to 6V non-overlapping MOSFET gate drivers helps avoid • Output Voltage Adjustable Down to 0.6V potential shoot-through problems while maintaining high efficiency. The IC is designed for the more cost- • Power Good Flag and Shutdown effective option of driving only N-channel MOSFETs • Output Overvoltage and Undervoltage in both the high-side and low-side positions. It senses Detection the low-side switch voltage drop for providing a • ±1.5% Feedback Voltage Accuracy Over simple, adjustable current limit. Temperature The LM2745/8 features a fixed-frequency voltage- • Low-side Adjustable Current Sensing mode PWM control architecture which is adjustable from 50 kHz to 1 MHz with one external resistor. In • Adjustable Soft-start addition, the LM2745 also allows the switching • Tracking and Sequencing with Shutdown and frequency to be synchronized to an external clock Soft Start Pins signal over the range of 250 kHz to 1 MHz. This wide • TSSOP-14 Package range of switching frequency gives the power supply designer the flexibility to make better tradeoffs APPLICATIONS between component size, cost and efficiency. • Down Conversion from 3.3V Features include the ability to startup with a pre- biased load on the output, soft-start, input • Cable Modem, DSL and ADSL undervoltage lockout (UVLO) and Power Good • Laser Jet and Ink Jet Printers (based on both undervoltage and overvoltage • Low Voltage Power Modules detection). In addition, the shutdown pin of the IC can be used for providing startup delay, and the soft-start • DSP, ASIC, Core and I/O pin can be used for implementing precise tracking, for the purpose of sequencing with respect to an external rail. Typical Application 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2005–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
Аналогичный номер детали - LM2745 |
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Аналогичное описание - LM2745 |
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