LM5642MTCX/NOPB ,4.5-36V, Current Mode Dual Synchronous Buck Controller with Oscillator Synchronization 28-TSSOP -40 to 125Connection DiagramKS1 RSNS1 RSNS128 28KS11 1ILIM1 SW1 SW127 ILIM1 272 2COMP1 HDRV1 HDRV126 COMP1 26 ..
LM5642XMH , LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
LM5642XMH/NOPB ,High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization 28-HTSSOP -40 to 125Connection DiagramKS1 RSNS1 RSNS128 28KS11 1ILIM1 SW1 SW127 ILIM1 272 2COMP1 HDRV1 HDRV126 COMP1 26 ..
LM5642XMHX , LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
LM5642XMT , LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
LM5642XMT , LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
LP311 ,Voltage Comparatormaximum ratings over operating free-air temperature range (unless otherwise noted)Supply voltage (s ..
LP311D ,Single, Low-Power, Strobed Differential Comparator with Open Collector and Emitter OutputsLP211, LP311LOW-POWER DIFFERENTIAL COMPARATORSWITH STROBESSLCS003D − JUNE 1987 − REVISED SEPTEMBER ..
LP311DR ,Single, Low-Power, Strobed Differential Comparator with Open Collector and Emitter Outputsmaximum ratings over operating free-air temperature range (unless otherwise noted)Supply voltage (s ..
LP311M ,LP311 Voltage Comparatorapplications where fastYSame pin-out as LM311response is not needed. It operates over a wide range ..
LP311M ,LP311 Voltage ComparatorFeaturesYLow power drain, 900 mW on 5V supplyThe LP311 is a low power version of the industry-stand ..
LP311MX ,Voltage ComparatorFeaturesYLow power drain, 900 mW on 5V supplyThe LP311 is a low power version of the industry-stand ..
LM5642MTCX/NOPB
4.5-36V, Current Mode Dual Synchronous Buck Controller with Oscillator Synchronization 28-HTSSOP
LM5642, LM5642X www.ti.com SNVS219K –JUNE 2003–REVISED APRIL 2013 LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization Check for Samples: LM5642, LM5642X 1FEATURES DESCRIPTION The LM5642 series consists of two current mode 2• Two Synchronous Buck Regulators synchronous buck regulator controllers operating • 180° Out of Phase Operation 180° out of phase with each other at a normal • 200 kHz Fixed Nominal Frequency: LM5642 switching frequency of 200kHz for the LM5642 and at 375kHz for the LM5642X. • 375 kHz Fixed Nominal Frequency: LM5642X • Synchronizable Switching Frequency from 150 Out of phase operation reduces the input RMS ripple current, thereby significantly reducing the required kHz to 250 kHz for the LM5642 and 200 kHz to input capacitance. The switching frequency can be 500 kHz for the LM5642X synchronized to an external clock between 150 kHz • 4.5V to 36V Input Range and 250 kHz for the LM5642 and between 200 kHz • 50µA Shutdown Current and 500 kHz for the LM5642X. The two switching regulator outputs can also be paralleled to operate as • Adjustable Output from 1.3V to 90% of Vin a dual-phase, single output regulator. • 0.04% (Typical) Line and Load Regulation Accuracy The output of each channel can be independently adjusted from 1.3V to 90% of Vin. An internal 5V rail • Current Mode Control with or without a Sense is also available externally for driving bootstrap Resistor circuitry. • Independent Enable/Soft-start Pins Allow Current-mode feedback control assures excellent line Simple Sequential Startup Configuration. and load regulation and wide loop bandwidth for • Configurable for Single Output Parallel excellent response to fast load transients. Current is Operation. (See Figure 4) sensed across either the Vds of the top FET or • Adjustable Cycle-by-cycle Current Limit across an external current-sense resistor connected in series with the drain of the top FET. • Input Under-voltage Lockout • Output Over-voltage Latch Protection The LM5642 features analog soft-start circuitry that is independent of the output load and output • Output Under-voltage Protection with Delay capacitance making the soft-start behavior more • Thermal Shutdown predictable and controllable than traditional soft-start • Self Discharge of Output Capacitors when the circuits. Regulator is OFF Over-voltage protection is available for both outputs. • TSSOP and HTSSOP (Exposed PAD) Packages A UV-Delay pin is also available to allow delayed shut off time for the IC during an output under-voltage APPLICATIONS event. • Embedded Computer Systems Typical Application Circuit • Navigation Systems • Telecom Systems V IN 4.5V - 36V • Set-Top Boxes UV_Delay Vout1 • WebPAD 1.3V-0.9VIN SYNC • Point Of Load Power Architectures LM5642/LM5642X SS/ON1 SS/ON2 Vout2 1.3V-0.9VIN 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. 2All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2003–2013, Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
