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LM21305 Folha de dados(PDF) 1 Page - Texas Instruments |
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LM21305 Folha de dados(HTML) 1 Page - Texas Instruments |
1 / 33 page 0.6V - 5V VIN LM21305 SW COMP FREQ EN FB PGOOD PGND 2V5 AVIN AGND 5V0 CBOOT PVIN CIN L RF C5V0 C2V5 CF Cc1 Rc CFRQ RFRQ RFB1 RFB2 CBOOT COUT SYNC VOUT REN1 REN2 RPG LM21305 www.ti.com SNVS639F – DECEMBER 2009 – REVISED MARCH 2013 5A Adjustable Frequency Synchronous Buck Regulator Check for Samples: LM21305 1 FEATURES APPLICATIONS 2 • High Efficiency Switcher Core With Integrated • POL Regulation From 3.3V, 5V, and 12V Low RDSon Power MOSFETs Supply Rails • Resistor Programmable Switching Frequency • High Efficiency Supply for DSPs, FPGAs, With Frequency Synchronization ASICs and Processors • Internal Soft-Start With Monotonic and Pre- • Broadband, Networking and Optical Biased Startup Communications Infrastructure • Low Shutdown Quiescent Current DESCRIPTION • Precision Enable With Hysteresis The LM21305 is a full-featured 5A synchronous buck • PGOOD Indicator Function POL regulator optimized for solution size, flexibilty, • Input Under-Voltage Lock-Out (UVLO) and high conversion efficiency. High power density LM21305 designs are achieved via monolithic • Output Over-Voltage Protection (OVP) integration of the high-side and low-side power • High-Bandwidth Load Transient Response MOSFETs, high switching frequency, current-mode With Peak Current-Mode Control control, and optimized thermal design. The efficiency • Cycle-by-Cycle Current Limiting of the LM21305 is elevated at light loads with diode emulation mode operation and at heavy loads by • Thermal Shutdown optimal design of the MOSFET gate drivers to minimize switch dead-times and body-diode KEY SPECIFICATIONS conduction losses. • 3V to 18V Single-Rail Input Voltage The LM21305 accepts a wide input voltage range of • 0.598V Feedback Voltage Reference 3V to 18V, facilitating interface to all intermediate bus • 300 kHz to 1.5 MHz Switching Frequency voltages, including 3.3V, 5V and 12V rails. An output voltage as low as 0.598V is supported with excellent • WQFN-28 Package (5 x 5 x 0.8 mm, 0.5 mm setpoint accuracy and low ripple and RMS noise. Pitch) 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 © 2009–2013, 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. |
Nº de peça semelhante - LM21305_15 |
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Descrição semelhante - LM21305_15 |
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