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LTC7813 Datasheet(PDF) 1 Page - Linear Technology |
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LTC7813 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTC7800 1 7800f For more information www.linear.com/LTC7800 TYPICAL APPLICATION FEATURES DESCRIPTION Low IQ, 60V, High Frequency Synchronous Step-Down Controller The LTC®7800 is a high performance step-down switching regulator DC/DC controller that drives an all N-channel synchronous power MOSFET stage. A constant fre- quencycurrentmodearchitectureallowsaphase-lockable frequency of up to 2.25MHz. The50μAno-loadquiescentcurrentextendsoperatingrun timeinbattery-poweredsystems.OPTI-LOOP®compensa- tion allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC7800 features a precision 0.8V reference and power good output indicator. A wide 4V to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. The output voltage of the LTC7800 can be programmed between 0.8V to 24V. The TRACK/SS pin ramps the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The PLLIN/MODE pin se- lects among Burst Mode operation, pulse-skipping mode, or continuous conduction mode at light loads. APPLICATIONS n Wide VIN Range: 4V to 60V (65V Abs Max) n Low Operating IQ: 50μA n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V n RSENSE or DCR Current Sensing n Phase-Lockable Frequency (320kHz to 2.25MHz) n Programmable Fixed Frequency (320kHz to 2.25MHz) n Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Load n Selectable Current Limit n Very Low Dropout Operation: 98% Duty Cycle n Adjustable Output Voltage Soft-Start or Tracking n Power Good Output Voltage Monitor n Output Overvoltage Protection n Low Shutdown IQ: < 14μA n Internal LDO Powers Gate Drive from VIN or EXTVCC n No Current Foldback During Start-Up n Small 20-Pin 3mm × 4mm QFN Package n Automotive Always-On Systems n Battery Powered Digital Devices n Distributed DC Power Systems L , LT, LTC, LTM, OPTI-LOOP, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. Patents, including 5481178, 5705919, 6611131, 6498466, 6580258, 7230497. 0.33µH 4m 357k 115k 2.2µF 0.1µF 33µF 100k 100k 2.49k 820pF 80pF 0.1µF VIN PGOOD EXTVCC INTVCC PGND FREQ ITH TRACK/SS SGND TG BOOST SW BG SENSE+ SENSE– VFB LTC7800 C 2.2µF C 56µF INTVCC V 28V IN 3.3V VOUT 10A 4V TO ×2 COUT I1 I2 ×3 High Efficiency 3.3V 2.1MHz Step-Down Regulator Efficiency and Power Loss vs Output Current VIN = 12V VOUT = 3.3V OUTPUT CURRENT (A) 0.0001 0.001 0.01 0.1 1 10 0 10 20 30 40 50 60 70 80 90 100 0.0001 0.001 0.01 0.1 1 10 3874 TA01b |
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