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LTC3892-1 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3892-1 Datasheet(HTML) 1 Page - Linear Technology |
1 / 36 page LTC3892/LTC3892-1 1 38921f For more information www.linear.com/LTC3892 Typical applicaTion FeaTures DescripTion 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller The LTC®3892/LTC3892-1 is a high performance dual step-down DC/DC switching regulator controller that drives all N-channel synchronous power MOSFET stages. Power loss and noise are minimized by operating the two controller output stages out-of-phase. The gate drive voltage can be programmed from 5V to 10V to allow the use of logic or standard-level FETs and to maximize efficiency. Internal switches in the top gate drivers eliminate the need for external bootstrap diodes. Awide4.5Vto60Vinputsupplyrangeencompassesawide rangeofintermediatebusvoltagesandbatterychemistries. Output voltages up to 99% of VIN can be regulated. OPTI- LOOP® compensation allows the transient response and loop stability to be optimized over a wide range of output capacitance and ESR values. The 29μA no-load quiescent current extends operating run time in battery powered systems. For a comparision of the LTC3892 to the LTC3892-1, see Table 1 in the Pin Functions section of this data sheet. High Efficiency Dual 5V/12V Output Step-Down Converter n Wide VIN Range: 4.5V to 60V (65V Abs Max) n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 99% • VIN n Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE) n No External Bootstrap Diodes Required n Low Operating IQ: 29μA (One Channel On) n Selectable Gate Drive UVLO Thresholds n Out-of-Phase Operation Reduces Required Input Capacitance and Power Supply Induced Noise 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 Selectable Current Limit (LTC3892) n Very Low Dropout Operation: 99% Duty Cycle n Power Good Output Voltage Monitors (LTC3892) n Low Shutdown IQ: 3.6μA n Small 32-Lead 5mm × 5mm QFN Package (LTC3892) n Small 28-Lead TSSOP Package (LTC3892-1) L , LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258. 4.7µF 0.1µF 15µH 8m 100pF 100k 7.15k 34.8k 1nF 150µF 1nF 0.1µF 0.1µF 5.6µH 5m 7.5k 47µF 100pF 0.1µF 2.2nF 0.1µF 220µF 1nF LTC3892 VIN RUN2 INTVCC GND SW2 BG2 TG2 BOOST2 SENSE2+ VFB2 ITH2 TRACK/SS2 12V SENSE2– DRVUV DRVCC RUN1 SW1 BG1 TG1 BOOST1 SENSE1+ VFB1 ITH1 TRACK/SS1 SENSE1– DRVSET VPRG1 VOUT2 5A VIN 12.5V TO 60V 5V VOUT1 8A 3892 TA01 applicaTions n Automotive and Industrial Power Systems n Distributed DC Power Systems n High Voltage Battery Operated Systems VIN = 12V VOUT = 5V Burst Mode OPERATION GATE DRIVE DRVCC=5V DRVCC=6V DRVCC=8V DRVCC=10V LOAD CURRENT (A) 0.01 0.1 1 10 88 89 90 91 92 93 94 95 96 Efficiency vs Output Current 3892 F01b Efficiency vs Output Current |
Similar Part No. - LTC3892-1_15 |
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Similar Description - LTC3892-1_15 |
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