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LT3800IFE-TRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LT3800IFE-TRPBF Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LT3800 1 3800fb TYPICAL APPLICATIO APPLICATIO S FEATURES ■ Wide 4V to 60V Input Voltage Range ■ Output Voltages up to 36V ■ Adaptive Nonoverlap Circuitry Prevents Switch Shoot-Through ■ Reverse Inductor Current Inhibit for Discontinuous Operation Improves Efficiency with Light Loads ■ Output Slew Rate Controlled Soft-Start with Auto-Reset ■ 100 µA No Load Quiescent Current ■ Low 10 µA Current Shutdown ■ 1% Regulation Accuracy ■ 200kHz Operating Frequency ■ Standard Gate N-Channel Power MOSFETs ■ Current Limit Unaffected by Duty Cycle ■ Reverse Overcurrent Protection ■ 16-Lead Thermally Enhanced TSSOP Package High-Voltage Synchronous Current Mode Step-Down Controller The LT ®3800 is a 200kHz fixed frequency high voltage synchronous current mode step-down switching regula- tor controller. The IC drives standard gate N-channel power MOSFETs and can operate with input voltages from 4V to 60V. An onboard regulator provides IC power directly from VIN and provides for output-derived power to minimize VIN quiescent current. MOSFET drivers employ an internal dynamic bootstrap feature, maximizing gate-source “ON” voltages during normal operation for improved operating efficiencies. The LT3800 incorporates Burst Mode ® opera- tion, which reduces no load quiescent current to under 100 µA. Light load efficiencies are also improved through a reverse inductor current inhibit, allowing the controller to support discontinuous operation. Both Burst Mode operation and the reverse-current inhibit features can be disabled if desired. The LT3800 incorporates a program- mable soft-start that directly controls the voltage slew rate of the converter output for reduced startup surge currents and overshoot errors. The LT3800 is available in a 16-lead thermally enhanced TSSOP package. DESCRIPTIO ■ 12V and 42V Automotive and Heavy Equipment ■ 48V Telecom Power Supplies ■ Avionics and Industrial Control Systems ■ Distributed Power Converters 12V 75W DC/DC Converter with Reverse Current Inhibit and Input UVLO Efficiency and Power Loss , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 6611131, 6304066, 6498466, 6580258. VIN SHDN CSS BURST_EN VFB VC SENSE– BOOST TG SW VCC BG PGND SENSE+ LT3800 SGND 1.5nF 200k 100pF 680pF 174k 1% 20k 1% 82.5k 1M 82.5k 0.015 Ω BAS19 1N4148 1 µF 1 µF 1 µF ×3 56 µF ×2 + 10 µF 270 µF + Si7850DP Si7370DP B160 15 µH VIN 20V TO 55V VOUT 12V AT 75W 3800 TA01a ILOAD (A) 100 95 90 3800 TA01b 70 75 85 80 6 5 4 0 1 3 2 10 0.1 1 VIN = 24V LOSS (48V) VIN = 48V VIN = 60V VIN = 36V |
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