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LTC3828 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3828 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTC3828 3828f 1 High Efficiency Dual 2.5V/3.3V Step-Down Converter with Tracking FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO Dual, 2-Phase Step-Down Controller with Tracking ■ Dual, 180 ° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise ■ Tracking for Both Outputs ■ Constant Frequency Current Mode Control ■ Wide VIN Range: 4.5V to 28V Operation ■ Power Good Output Voltage Indicator ■ Adjustable Soft-Start Current Ramping ■ Foldback Output Current Limiting– Disabled at Start-Up ■ No Reverse Current During Soft-Start Interval ■ Clock Output for 3-, 4-, 6-Phase Operation ■ Dual N-Channel MOSFET Synchronous Drive ■ ±1% Output Voltage Accuracy ■ Phase-Lockable Fixed Frequency 260kHz to 550kHz ■ OPTI-LOOP ® Compensation Minimizes COUT ■ Very Low Dropout Operation: 99% Duty Cycle ■ Output Overvoltage Protection ■ Small 28-Lead SSOP and 5mm × 5mm QFN Packages The LTC ®3828 is a dual high performance step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant fre- quency current mode architecture allows for a phase- lockable frequency of up to 550kHz. The TRCKSS pin provides both soft-start and tracking functions. Multiple LTC3828s can be daisy-chained in applications requiring more than two voltages to be tracked. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The precision 0.8V reference and power good output indicator are compatible with a wide 4.5V to 28V (30V maximum) input supply range, encompassing all bat- tery chemistries. The RUN pins control their respective channels indepen- dently. The FCB/PLLIN pin selects among Burst Mode ® operation, skip-cycle mode and continuous current mode. Current foldback limits MOSFET dissipation during short- circuit conditions. Reverse current and current foldback functions are disabled during soft-start. ■ Telecom Infrastructure ■ ASIC Power Supply ■ Industry Equipment + 4.7 µF 0.1 µF 63.4k 1% 1000pF 3.2 µH 220pF 1 µF CERAMIC 22 µF 50V CERAMIC + 47 µF 4V SP 0.01 Ω 20k 1% 20k 1% 15k 3.3V 5A 0.1 µF 0.1 µF 0.1 µF 42.5k 1% 3.2 µH 220pF 1000pF + 56 µF 4V SP 0.01 Ω 20k 1% 15k 2.5V 5A TG1 TG2 BOOST1 BOOST2 SW1 SW2 BG1 BG2 SGND PGND SENSE1+ SENSE2+ SENSE1– SENSE2– VOSENSE1 VOSENSE2 ITH1 ITH2 VIN PGOOD INTVCC RUN1 RUN2 4.5V TO 28V 3828 TA01 LTC3828 FCB/PLLIN 500kHz TRCKSS1 TRCKSS1 TRCKSS2 63.4k 1% , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode and OPTI-LOOP 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, 6304066, 6580258 |
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