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LTC7899 Datasheet(PDF) 1 Page - Analog Devices |
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LTC7899 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 50 page  Data Sheet LTC7899 140V, Low IQ, Negative to Positive Synchronous Boost Controller with 10V Gate Drive Rev. 0 DOCUMENT FEEDBACK One Analog Wa y, Wilmington, MA 01887 -2356, U.S.A. Tel: 781.329.47 00 TECHNICAL SUPPORT ©2025 Analog Devices, Inc. Al l rights re serve d. FEATURES Converts Negative Input to Positive Output Regulated with Respect to Ground Wide |VIN-|+VOUT Range: 4V to 135V (140V ABS MAX) Internal Feedback Level Shifter for Easy Output Voltage Programming with Two Resistors Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE, 14V ABS MAX) Adjustable Driver Voltage UVLO Adaptive or Resistor-Adjustable Dead Times Split-Output Gate Drivers for Adjustable Turn-On and Turn-Off Driver Strengths Supports Positive Input to Positive Output Boost Up to 135V with Pass-Through Operation Down to 1V after Start-Up CLK Output for High Power PolyPhase Operation Spread Spectrum Frequency Modulation Programmable Frequency (100kHz to 2.5MHz) Phase-Lockable Frequency (100kHz to 2.5MHz) 28-Pin (4mm x 5mm) QFN Package APPLICATIONS Industrial Power Systems Military/Avionics Telecommunications Power Systems GENERAL DESCRIPTION The LTC®7899 is a high performance DC/DC negative to positive switching regulator controller that drives all N- channel synchronous MOSFET stages and can operate from input voltages up to 135V. The positive output voltage can easily be programmed with only two resistors by using the integrated feedback level shifter. The LTC7899 can alternatively be configured as a step- up (Boost) operation with pass-through. The gate drive voltage for the LTC7899 can be pro- grammed from 5V to 10V to allow the use of logic or standard-level MOSFETs to maximize efficiency. The low no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The user can adjust the dead times of the LTC7899 with external resistors for margin or to tailor the application for higher efficiency and allow for high frequency operation. The LTC7899 additionally features spread spectrum operation, which significantly reduces the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards. TYPICAL APPLICATION Figure 1. High Power -48V Input to 48V Output Converter Figure 2. VOUT Efficiency for Figure 1 56µF ×4 68µF ×3 15µH 2mΩ 0.1µF 402kΩ 10kΩ 0.1µF 4.7µF 0.1µF 15nF 470pF 10kΩ 249kΩ 0.22µF ×4 10µF ×4 10µF ×4 20kΩ 21kΩ RUN VBIAS SENSE+ SENSE– INTVCC DRVCC VIN– VIN– VIN– SS ITH VFBB VFBA TGDN TGUP BGDN BGUP SW BOOST LTC7899 VOUT 48V UP TO 8.8A DTCB DTCA DRVSET DRVUV MODE EXTVCC FREQ ILIM DRVCC PLLIN/SPREAD PHASMD PGOOD CLKOUT VIN– –32V TO –54V BURST MODE fSW = 150kHz VOUT = +48V VIN– = –48V LOAD CURRENT (A) 0.01 0.1 1 9 90 91 92 93 94 95 96 97 98 99 100 |
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