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LTC7813 Datasheet(PDF) 1 Page - Analog Devices |
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LTC7813 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 28 page  LTC7878 1 Rev. 0 For more information www.analog.com Document Feedback TYPICAL APPLICATION FEATURES DESCRIPTION 70V Parallelable 4-Switch Buck-Boost Controller with Inductor DCR Current Sensing The LTC®7878 is a high performance buck-boost switch- ing regulator controller that operates from an input volt- age above, below or equal to the output voltage. The con- stant-frequency, peak current mode architecture allows a phase-lockable switching frequency of up to 600kHz, while a programmable input or output current loop regu- lates the average input or output current accurately sup- porting battery charging applications. With a wide 5V to 70V input and output range and seamless, low noise tran- sitions between operating regions, the LTC7878 is ideal for industrial and telecom systems. The LTC7878 features forced continuous mode (FCM)/ pulse-skipping mode operation. It supports multiphase/ multi-ICs parallel operation for high power applications. Additional features include 7V N-Channel gate drivers, smart EXTVCC auxiliary supply and programmable induc- tor peak current limit. A PGOOD pin indicates when the output is within 10% of its designed set point. The LTC7878 is available in a low profile 32-Lead QFN package. Input Voltage Line Transient 9VIN to 15VIN to 9VIN APPLICATIONS n Single Inductor Architecture Allows VIN Above, Below or Equal to the Regulated VOUT n Synchronous Rectification: Up to 98% Efficiency n Wide VIN Voltage Range: 5V to 70V n ±1% Output Voltage Accuracy: 1V ≤ VOUT ≤ 70V n DCR or RSENSE Current Sensing n Peak Current Mode Control in Buck/Boost/Buck- Boost Mode n Programmable Input or Output Current Regulation n 7V NMOS Gate Drivers n Phase-Lockable Frequency (100kHz to 600kHz) n Multiphase/Multi-ICs Parallel Operation n Selectable Continuous or Pulse-Skipping Mode Operation and Inductor Peak Current Limits n Small 32-Lead 5mm × 5mm QFN Package n Industrial and Telecom Systems n Distributed DC Power or Battery Systems All registered trademarks and trademarks are the property of their respective owners. 1ms/DIV VIN 10V/DIV SW1 10V/DIV VOUT(AC) 500mV/DIV IL 2A/DIV 7878 TA01b BOOST1 BOOST2 BOOST1 BOOST2 M4 M3 M2 M1 CIN 22µF COUT2 220µF R1 110k RC 10k 8k CBST2 0.1µF R2 10k CINTVCC 4.7µF DBST1 DBST2 L 4.7µF CSS 0.022µF 15nF 100k CDRVCC 4.7µF TG2 BG2 BG1 TG1 VOUT 12V, 6A BOOST1 BOOST2 SW1 SW2 ISNSP ISNSN ISNSD CSP CSN VIN 9V TO 36V VFB DRVCC EXTVCC SS VOUT MODE/ILIM SGND PGND ITH FREQ VIN LTC7878 INTVCC ITHB 7878 TA01a COUT1 220µF CC 47nF CBST1 0.1µF |
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