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LM2743MTC Folha de dados(PDF) 1 Page - Texas Instruments |
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LM2743MTC Folha de dados(HTML) 1 Page - Texas Instruments |
1 / 37 page HG BOOT ISEN LG PGND FB VCC SD PWGD FREQ SS/TRACK SGND EAO PGND VCC = 3.3V VIN = 3.3V VOUT = 1.2V@4A RFB2 CC2 RC1 RCS CSS RFADJ RCC CCC D1 CBOOT Q1 CIN1,2 L1 + CC1 RFB1 CO1,2 LM2743 RC2 CC3 RPULL-UP + LM2743 www.ti.com SNVS276G – APRIL 2004 – REVISED MARCH 2013 LM2743 Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller Check for Samples: LM2743 1 FEATURES DESCRIPTION The LM2743 is a high-speed synchronous buck 2 • Power Stage Input Voltage from 1V to 16V regulator controller with an accurate feedback voltage • Control Stage Input Voltage from 3V to 6V accuracy of ±2%. It can provide simple down • Output Voltage Adjustable down to 0.6V conversion to output voltages as low as 0.6V. Though the control sections of the IC are rated for 3 to 6V, • Power Good Flag and Shutdown the driver sections are designed to accept input • Output Over-Voltage and Under-Voltage supply rails as high as 16V. The use of adaptive non- Detection overlapping MOSFET gate drivers helps avoid • ±2% Feedback Voltage Accuracy Over potential shoot-through problems while maintaining Temperature high efficiency. The IC is designed for the more cost- effective option of driving only N-channel MOSFETs • Low-Side Adjustable Current Sensing in both the high-side and low-side positions. It senses • Adjustable Soft-Start the low-side switch voltage drop for providing a • Tracking and Sequencing with Shutdown and simple, adjustable current limit. Soft-Start Pins The fixed-frequency voltage-mode PWM control • Switching Frequency from 50 kHz to 1 MHz architecture is adjustable from 50 kHz to 1 MHz with one external resistor. This wide range of switching • TSSOP-14 Package frequency gives the power supply designer the flexibility to make better tradeoffs between APPLICATIONS component size, cost and efficiency. • 3.3V Buck Regulation Features include soft-start, input under-voltage • Cable Modem, DSL and ADSL lockout (UVLO) and Power Good (based on both • Laser Jet and Ink Jet Printers under-voltage and over-voltage detection). In addition, the shutdown pin of the IC can be used for • Low Voltage Power Modules providing startup delay, and the soft-start pin can be • DSP, ASIC, Core and I/O used for implementing precise tracking, for the purpose of sequencing with respect to an external rail. Typical Application Figure 1. Typical Application Circuit 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 © 2004–2013, 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. |
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