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LTC3871 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3871 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 38 page  LTC7801 1 7801f For more information www.linear.com/LTC7801 Typical applicaTion FeaTures DescripTion 150V Low IQ, Synchronous Step-Down DC/DC Controller The LTC®7801 is a high performance step-down switching regulator DC/DC controller that drives an all N-channel synchronous power MOSFET stage that can operate from input voltages up to 140V. A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz. The gate drive voltage can be programmed from 5V to 10V to allow the use of logic or standard-level FETs to maxi- mize efficiency. An integrated switch in the top gate driver eliminates the need for an external bootstrap diode. An internalchargepumpallowsfor100%dutycycleoperation. Thelow40μAno-loadquiescentcurrentextendsoperating run time in battery-powered systems. OPTI-LOOP® com- pensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC7801 features a precision 0.8V reference and power good output indicator. The output voltage can be programmedbetween0.8Vto60Vusingexternalresistors. High Efficiency High Voltage 12V Output Step-Down Regulator Efficiency and Power Loss vs Load Current applicaTions n Wide VIN Range: 4V to 140V (150V Abs Max) n Wide Output Voltage Range: 0.8V to 60V n Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE) n Low Operating IQ: 40μA (Shutdown = 10μA) n 100% Duty Cycle Operation n No External Bootstrap Diode Required n Selectable Gate Drive UVLO Thresholds n Onboard LDO or External NMOS LDO for DRVCC n EXTVCC LDO Powers Drivers from VOUT n Phase-Lockable Frequency (75kHz to 850kHz) n Programmable Fixed Frequency (50kHz to 900kHz) n Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Loads n Adjustable Burst Clamp n Power Good Output Voltage Monitor n Programmable Input Overvoltage Lockout n Small 24-Lead 4mm × 5mm QFN or TSSOP Packages n Automotive and Industrial Power Systems n High Voltage Battery Operated Systems n Telecommunications Power Systems L , LT, LTC, LTM, Burst Mode, OPTI-LOOP, PolyPhase, Linear Technology and the Linear logo are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258. 0.1µF 4.7µF 7801 TA01a 6m 511k 150µF 36.5k 1nF 0.1µF 0.1µF 10k 4.7nF 100pF 100µF 33µH 30.1k VIN INTVCC CPUMP_EN ITH SS FREQ GND LTC7801 TG SW BG SENSE+ SENSE– EXTVCC VFB BOOST RUN NDRV DRVCC VIN 7V to 140V VOUT 12V* 5A x3 *VOUT FOLLOWS VIN WHEN VIN < 12V POWER LOSS VIN = 48V EFFICIENCY VIN = 24V LOAD CURRENT (A) 0.0001 0.001 0.01 0.1 1 10 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1k 10k 7801 TA01b |
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