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LTC1876 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1876 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 36 page  LTC1876 1 1876fa APPLICATIO S FEATURES DESCRIPTIO TYPICAL APPLICATIO High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator The LTC ®1876 is a high performance triple output switching regulator. It incorporates a dual step-down switching con- trollerthatdrivesallN-channelsynchronous power MOSFET stages. A step-up regulator with an internal 1A, 36V switch provides the third output. The step-down controllers minimize power loss and noise by operating the output stage of each controller out of phase. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. A RUN/SS pin for each controller provides both soft-start and an optional timed, short-circuit shutdown that can be configured to latch off one or both controllers. Current foldback provides additional short-circuit protection. In an overvoltage condition, the bottom MOSFET is latched on until VOUT returns to normal. The FCB pin can be used to inhibit Burst Mode operation or to enable regulation of a secondary output voltage. The step-up regulator operates at 1.2MHz, allowing the use of tiny low cost capacitors and inductors. In addition, its internal 1A switch allows high current outputs to be generated. Its current mode control scheme provides excellent line and load regulation. Step-Down Controller s Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise s Power Good Output Voltage Indicator s OPTI-LOOP TM Compensation Minimizes COUT s DC Programmed Fixed Frequency 150kHz to 300kHz s Wide VIN Range: 3.5V to 36V Operation s Very Low Dropout Operation: 99% Duty Cycle s Adjustable Soft-Start Current Ramping s Latched Short-Circuit Shutdown with Defeat Option s Remote Output Voltage Sense and OV Protection s 5V and 3.3V Standby Regulators s Selectable Const. Freq. or Burst ModeTM Operation Step-Up Regulator s High Operating Switching Frequency of 1.2MHz s Low Internal VCESAT Switch: 400mV @ 1A, VIN = 3V s Wide VIN Range: 2.6V to 16V Operation s High Output Voltage: Up to 34V s 3.3V Input Step-Down Converter s Notebook and Palmtop Computers, PDAs s Battery-Operated Digital Devices , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation. Figure 1. High Efficiency Triple 5V/3.3V/12V Power Supply 4.7 µF 10V M4 M3 0.1 µF 63.4k 1% 1000pF 6.3 µH 220pF 1 µF CER 33 µF 35V ALUM 10 µF 35V CER + 56 µF 4V SP 0.01 Ω 20k 1% 15k VOUT2 3.3V 5A M2 M1 0.1 µF 105k 1% 6.8 µH 220pF 1000pF + + + + 47 µF 6.3V SP 0.01 Ω 20k 1% 10.2k 1% 15k VOUT1 5V 4A VOUT3 12V 200mA TG2 TG1 BOOST2 BOOST1 SW2 SW1 BG2 BG1 PGND PGOOD AUXSW AUXVFB AUXSD SENSE2+ SENSE1+ SENSE2– SENSE1– VOSENSE2 VOSENSE1 ITH2 ITH1 AUXVIN VIN INTVCC RUN/SS2 RUN/SS1 VIN 5.2V TO 28V M1, M2, M3, M4: FDS6680A 1876 TA01 0.1 µF 0.1 µF LTC1876 SGND 86.6k, 1% 10 µH 10 µF 20V |
Similar Part No. - LTC1876_15 |
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Similar Description - LTC1876_15 |
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