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LM20143 bảng dữ liệu(PDF) 1 Page - Texas Instruments |
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LM20143 bảng dữ liệu(HTML) 1 Page - Texas Instruments |
1 / 30 page PVIN SW AGND FB PGOOD EN SS/TRK AVIN COMP LM20143 L RF VCC PGND CIN RC1 CC1 VIN CSS CVCC COUT VOUT RFB2 RFB1 CF RT RT (optional) LM20143 www.ti.com SNVS528F – OCTOBER 2007 – REVISED NOVEMBER 2011 LM20143/LM20143Q 3A, PowerWise® Adjustable Frequency Synchronous Buck Regulator Check for Samples: LM20143 1 FEATURES DESCRIPTION 2 • Available in AEC-Q100 Temperature Grade 1 The LM20143 is a full featured adjustable frequency • Input voltage range: 2.95V to 5.50V synchronous buck regulator capable of delivering up • Accurate current limit minimizes inductor size to 3A of continuous output current. The current mode control loop can be compensated to be stable with • 97% peak efficiency virtually any type of output capacitor. For most cases, • Adjustable output voltage down to 0.80V compensating the device only requires two external • Adjustable switching frequency (500 kHz to 1.5 components, providing maximum flexibility and ease MHz) of use. The device is optimized to work over the input voltage range of 2.95V to 5.5V making it suited for a • 32 m Ω integrated FET switches wide variety of low voltage systems. • Starts into prebiased loads The device features internal over voltage protection • Output voltage tracking (OVP) and over current protection (OCP) circuits for • Peak current mode control increased system reliability. A precision enable pin • Adjustable Soft-Start with external capacitor and integrated UVLO allows the turn-on of the device to be tightly controlled and sequenced. Start-up • Precision enable pin with hysteresis inrush currents are limited by both an internally fixed • Integrated OVP, UVLO, power good and and externally adjustable Soft-Start circuit. Fault thermal shutdown detection and supply sequencing is possible with the • TSSOP 16-pin exposed pad package integrated power good circuit. The frequency of this device can be adjusted from APPLICATIONS 500 kHz to 1.5 MHz by connecting an external • Simple to design, high efficiency point of load resistor from the RT pin to ground. regulation from a 5V or 3.3V bus The LM20143 is designed to work well in multi-rail • High Performance DSPs, FPGAs, ASICs and power supply architectures. The output voltage of the microprocessors device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20143 is • Broadband, Networking and Optical pre-biased at startup it will not sink current to pull the Communications Infrastructure output low until the internal soft-start ramp exceeds the voltage at the feedback pin. The LM20143 is offered in a 16-pin TSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need for bulky heatsinks. 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 © 2007–2011, 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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