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LM20145-Q1 Folha de dados(PDF) 1 Page - Texas Instruments |
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LM20145-Q1 Folha de dados(HTML) 1 Page - Texas Instruments |
1 / 29 page PVIN SW AGND FB PGOOD EN SS/TRK AVIN COMP LM20145 L RF VCC PGND CIN RC1 CC1 VIN CSS CVCC COUT VOUT RFB2 RFB1 CF RT RT (optional) LM20145 www.ti.com SNVS530E – OCTOBER 2007 – REVISED MARCH 2013 LM20145/LM20145Q 5A, PowerWise® Adjustable Frequency Synchronous Buck Regulator Check for Samples: LM20145 1 FEATURES DESCRIPTION The LM20145 is a full featured adjustable frequency 2 • Available in AEC-Q100 Temperature Grade 1 synchronous buck regulator capable of delivering up • Input Voltage Range 2.95V to 5.5V to 5A of continuous output current. The current mode • Accurate Current Limit Minimizes Inductor control loop can be compensated to be stable with Size virtually any type of output capacitor. For most cases, compensating the device only requires two external • 97% Peak Efficiency components, providing maximum flexibility and ease • Adjustable Switching Frequency (250 kHz to of use. The device is optimized to work over the input 750 kHz) 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 up into Pre-Biased Loads The device features internal over voltage protection (OVP) and over current protection (OCP) circuits for • Output Voltage Tracking increased system reliability. A precision enable pin • Peak Current Mode Control and integrated UVLO allows the turn-on of the device • Adjustable Output Voltage down to 0.8V to be tightly controlled and sequenced. Start-up • Adjustable Soft-Start with External Capacitor inrush currents are limited by both an internally fixed and externally adjustable Soft-Start circuit. Fault • Precision Enable Pin with Hysteresis detection and supply sequencing is possible with the • Integrated OVP, UVLO, Power Good and integrated power good circuit. Thermal Shutdown The LM20145 is designed to work well in multi-rail • HTSSOP 16-Pin Exposed Pad Package power supply architectures. The output voltage of the device can be configured to track a higher voltage rail APPLICATIONS using the SS/TRK pin. If the output of the LM20145 is pre-biased at startup it will not sink current to pull the • Simple to Design, High Efficiency Point of output low until the internal soft-start ramp exceeds Load Regulation from a 5V or 3.3V Bus the voltage at the feedback pin. • High Performance DSPs, FPGAs, ASICs and The frequency of this device can be adjusted from Microprocessors 250 kHz to 750 kHz by connecting an external • Broadband, Networking and Optical resistor from the RT pin to ground. Communications Infrastructure The LM20145 is offered in a 16-pin HTSSOP 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 © 2007–2013, 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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