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LM20333 Scheda tecnica(PDF) 1 Page - Texas Instruments |
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LM20333 Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 30 page LM20333 www.ti.com SNVS558C – MAY 2008 – REVISED JANUARY 2009 LM20333 36V, 3A Synchronous Buck Regulator with Frequency Synchronization Check for Samples: LM20333 1 FEATURES DESCRIPTION The LM20333 is a full featured synchronous buck 2 • 4.5V to 36V Input Voltage Range regulator capable of delivering up to 3A of load • 3A Output Current, 5.2A Peak Current current. The current mode control loop is externally • 130 m Ω/110 mΩ Integrated Power MOSFETs compensated with only two components, offering both high performance and ease of use. The device is • 94% Peak Efficiency with Synchronous optimized to work over the input voltage range of Rectification 4.5V to 36V making it well suited for high voltage • 1.5% Feedback Voltage Accuracy systems. • Current Mode Control, Selectable The device features internal Over Voltage Protection Compensation (OVP) and Over Current Protection (OCP) circuits for • Oscillator Synchronization from 250kHz to increased system reliability. A precision Enable pin 1.5MHz and integrated UVLO allows the turn on of the device to be tightly controlled and sequenced. Startup inrush • Adjustable Output Voltage Down to 0.8V currents are limited by both an internally fixed and • Compatible with Pre-biased Loads externally adjustable soft-start circuit. Fault detection • Programmable Soft-start with External and supply sequencing are possible with the Capacitor integrated power good (PGOOD) circuit. • Precision Enable Pin with Hysteresis The LM20333 is designed to work well in multi-rail • OVP, UVLO Inputs and PGOOD Output power supply architectures. The output voltage of the device can be configured to track a higher voltage rail • Internally Protected with Peak Current Limit, using the SS/TRK pin. If the output of the LM20333 is Thermal Shutdown and Restart pre-biased at startup it will not sink current to pull the • Accurate Current Limit Minimizes Inductor output low until the internal soft-start ramp exceeds Size the voltage at the feedback pin. • Non-linear Current Mode Slope Compensation The switching frequency of the LM20333 can be • 20-Pin HTSSOP Exposed Pad Package synchronized to an external clock by use of the SYNC pin. The SYNC pin is capable of synchronizing APPLICATIONS to input signals ranging from 250 kHz to 1.5 MHz. • Simple to Design, High Efficiency Point of The LM20333 is offered in an exposed pad 20-pin Load Regulation from a 4.5V to 36V Bus HTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks. • High Performance DSPs, FPGAs, ASICs and Microprocessors • Communications Infrastructure, Automotive 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 © 2008–2009, 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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