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LM2744 数据表(PDF) 1 Page - Texas Instruments |
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LM2744 数据表(HTML) 1 Page - Texas Instruments |
1 / 33 page HG BOOT ISEN LG SGND FB VCC SD PWGD FREQ SS/TRACK VREF EAO PGND VCC = 3.3V VIN = 3.3V VOUT = 1.2V@4A RFB2 CC2 RC1 RCS RFADJ RCC CCC D1 CBOOT Q1 CIN1,2 L1 + CC1 RFB1 CO1,2 LM2744 RC2 CC3 RPULL-UP External Reference 0.5 to 1.5V CSS LM2744 www.ti.com SNVS292F – SEPTEMBER 2004 – REVISED MARCH 2013 LM2744 Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller with External Reference Check for Samples: LM2744 1 FEATURES DESCRIPTION The LM2744 is a high-speed synchronous buck 2 • Power Stage Input Voltage from 1V to 16V regulator controller with an externally adjustable • Control stage Input Voltage from 3V to 6V reference voltage (between 0.5V to 1.5V). It can • Output Voltage Adjustable Down to 0.5V provide simple down conversion to output voltages as low as 0.5V. Though the control sections of the IC • Power Good Flag and Shutdown are rated for 3 to 6V, the driver sections are designed • Output Overvoltage and Undervoltage to accept input supply rails as high as 16V. The use Detection of adaptive non-overlapping MOSFET gate drivers • External Reference Voltage 0.5V to 1.5V helps avoid potential shoot-through problems while maintaining high efficiency. The IC is designed for the • Low-side Adjustable Current Sensing more cost-effective option of driving only N-channel • Adjustable Soft-Start MOSFETs in both the high-side and low-side • Tracking and Sequencing with Shutdown and positions. It senses the low-side switch voltage drop Soft Start Pins for providing a simple, adjustable current limit. • Switching Frequency from 50 kHz to 1 MHz The fixed-frequency voltage-mode PWM control • 14-Pin TSSOP Package architecture is adjustable from 50 kHz to 1 MHz with one external resistor. This wide range of switching frequency gives the power supply designer the APPLICATIONS flexibility to make better tradeoffs between • 3.3V Buck Regulation component size, cost and efficiency. • Cable Modem, DSL and ADSL Features include soft-start, input undervoltage lockout • Laser Jet and Ink Jet Printers (UVLO) and Power Good (based on both undervoltage and overvoltage detection). In addition, • Low Voltage Power Modules the shutdown pin of the IC can be used for providing • DSP, ASIC, Core and I/O startup delay, and the soft-start pin can be used for • DDR Memory Termination Supply 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 © 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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类似说明 - LM2744 |
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