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LM20143QMH Folha de dados(PDF) 1 Page - Texas Instruments |
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LM20143QMH Folha de dados(HTML) 1 Page - Texas Instruments |
1 / 36 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) Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM20143, LM20143-Q1 SNVS528H – OCTOBER 2007 – REVISED JANUARY 2016 LM20143/LM20143-Q1 3-A PowerWise™ Adjustable Frequency Synchronous Buck Regulator 1 Features 3 Description The LM20143 devices are full featured PowerWise™ 1 • Available in AEC-Q100 Temperature Grade 1 adjustable frequency synchronous buck regulators • Input Voltage Range: 2.95 V to 5.50 V capable of delivering up to 3 A of continuous output • Accurate Current Limit Minimizes Inductor Size current. The current mode control loop can be compensated to be stable with virtually any type of • 97% Peak Efficiency output capacitor. For most cases, compensating the • Adjustable Output Voltage Down to 0.80 V device only requires two external components, • Adjustable Switching Frequency (500 kHz to 1.5 providing maximum flexibility and ease of use. The MHz) device is optimized to work over the input voltage range of 2.95 V to 5.5 V, making it suited for a wide • 32-m Ω Integrated FET Switches 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 Thermal and externally adjustable Soft-Start circuit. Fault Shutdown detection and supply sequencing is possible with the integrated power good circuit. 2 Applications The frequency of this device can be adjusted from • Simple to Design, High Efficiency Point of Load 500 kHz to 1.5 MHz by connecting an external Regulation from a 5-V or 3.3-V Bus resistor from the RT pin to ground. • High Performance DSPs, FPGAs, ASICs, and The LM20143 is designed to work well in multi-rail Microprocessors power supply architectures. The output voltage of the • Broadband, Networking, and Optical device can be configured to track a higher voltage rail Communications Infrastructure using the SS/TRK pin. If the output of the LM20143 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) LM20143 HTSSOP (16) 4.40 mm × 5.00 mm LM20143-Q1 (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical Application Circuit 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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