Datenblatt-Suchmaschine für elektronische Bauteile |
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LM25088Q Datenblatt(PDF) 1 Page - Texas Instruments |
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LM25088Q Datenblatt(HTML) 1 Page - Texas Instruments |
1 / 33 page BOOT SW COMP FB RAMP DITH/RES VCC VIN OUT CS CSG VOUT EN HG GND L D Rs Q CDITHER/RESTART CIN CVCC CSS CRAMP RRAMP RRT RCOMP CCOMP CHF COUT1 COUT2 RFB2 RFB1 CBOOT RUV2 RUV1 VIN (4.5V-42V) SS RT/SYNC LM25088 LM25088 www.ti.com SNVS609G – DECEMBER 2008 – REVISED MARCH 2011 LM25088/LM25088Q Wide Input Range Non-Synchronous Buck Controller Check for Samples: LM25088 1 FEATURES DESCRIPTION The LM25088 high voltage non-synchronous buck 2 • LM25088Q is an Automotive Grade Product controller features all the necessary functions to that is AEC-Q100 Grade 1 Qualified (-40°C to implement an efficient high voltage buck converter +125°C Operating Junction Temperature) using a minimum number of external components. • Emulated Current Mode Control The LM25088 can be configured to operate over an ultra-wide input voltage range of 4.5V to 42V. This • Drives External High-Side N-Channel MOSFET easy to use controller includes a level shifted gate • Ultra-Wide Input Voltage Range from 4.5V to driver capable of controlling an external N-channel 42V buck switch. The control method is based upon peak • Low IQ Shutdown and Standby Modes current mode control utilizing an emulated current ramp. The use of an emulated control ramp reduces • High Duty Cycle Ratio Feature for Reduced noise sensitivity of the pulse-width modulation circuit, Dropout Voltage allowing reliable control of very small duty cycles • Spread Spectrum EMI Reduction (LM25088-1) necessary in high input voltage/low output voltage • Hiccup Timer for Overload Protection applications. The LM25088 switching frequency is (LM25088-2) programmable from 50 kHz to 1 MHz. • Adjustable Output Voltage from 1.205V with The LM25088 is available in two versions: The 1.5% Feedback Reference Accuracy LM25088-1 provides a +/-5% frequency dithering function to reduce the conducted and radiated EMI, • Wide Bandwidth Error Amplifier while the LM25088-2 provides a versatile restart timer • Single Resistor Oscillator Frequency Setting for overload protection. Additional features include a • Oscillator Synchronization Capability low dropout bias regulator, tri-level enable input to • Programmable Soft-Start control shutdown and standby modes, soft-start and oscillator synchronization capability. The device is • High Voltage, Low Dropout Bias Regulator available in a thermally enhanced HTSSOP-16 pin • Thermal Shutdown Protection package. PACKAGE • HTSSOP-16 Simplified Application Schematic 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 © 2008–2011, 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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