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LTC3890 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3890 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 34 page  LTC3807 1 3807fa For more information www.linear.com/LTC3807 IOUT (A) FIGURE 13 CIRCUIT Burst Mode OPERATION 0 70 100 1 0.1 0.01 0.001 0.0001 10 3807 TA01b 50 40 30 20 0.01 0.1 1 10 0.001 10 60 80 90 VIN = 24V VOUT = 12V POWER LOSS EFFICIENCY TYPICAL APPLICATION FEATURES DESCRIPTION Low IQ, Synchronous Step-Down Controller with 24V Output Voltage Capability The LTC®3807 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 750kHz. 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 LTC3807 features a precision 0.8V reference and power good output indicator. A wide 4V to 38V input supply range encompasses a wide range of intermediate bus voltages andbatterychemistries. TheoutputvoltageoftheLTC3807 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. Efficiency and Power Loss vs Output Current APPLICATIONS n Wide VIN Range: 4V to 38V (40V 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 (75kHz to 750kHz) n Programmable Fixed Frequency (50kHz to 900kHz) n Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Load n Selectable Current Limit n Very Low Dropout Operation: 99% 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 and TSSOP Packages 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 Linear Technology Corporation. All other trademarks are the property of their respective owners. Patents, including 5481178, 5705919, 6611131, 6498466, 6580258, 7230497. 0.1µF 22µF VIN 12.5V TO 38V 60.4k 15.4k 4.7nF 100k 6.98k 3807 TA01a 2.2µF 47pF 0.1µF FREQ ITH SGND EXTVCC VOUT LTC3807 VIN INTVCC 10µH 4m INTVCC BOOST SW BG PGND SENSE– SENSE+ TG 100k 150µF VOUT 12V 10A TRACK/SS VFB PGOOD High Efficiency 12V/10A Step-Down Converter |
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