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EAGLE Library Object
|Uploaded by:||Juergen Messerer|
|Remarks:||This library is a part of the archive file m-pad-2.1.zip|
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|Download options:||Download whole archive|
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|Description:||Linear Tech's LTC1628 High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators|
The LTC®1628/LTC1628-PG are high performance dual step-down switching regulator controllers that drive all
N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows adjustment
of the frequency up to 300kHz. Power loss and noise due to the ESR of the input capacitors are minimized by
operating the two controller output stages out of phase.
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 future microprocessor
generations, and a wide 3.5V to 30V (36V maximum) input supply range encompasses all battery chemistries.
A RUN/SS pin for each controller provides both soft-start and optional timed, short-circuit shutdown. Current
foldback limits MOSFET dissipation during short-circuit conditions when overcurrent latchoff is disabled. Output
overvoltage protection circuitry latches on the bottom MOSFET until VOUT returns to normal. The FCB mode pin
can select among Burst Mode, constant frequency mode and continuous inductor current mode or regulate a
secondary winding. The LTC1628-PG includes a power good output pin that replaces the FLTCPL, fault coupling
control pin of the LTC1628.
Features: Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise OPTI-LOOP® Compensation Minimizes COUT ±1% Output Voltage Accuracy Dual N-Channel MOSFET Synchronous Drive Power Good Output Voltage Monitor (LTC1628-PG) DC Programmed Fixed Frequency 150kHz to 300kHz Wide VIN Range: 3.5V to 36V Operation Very Low Dropout Operation: 99% Duty Cycle Adjustable Soft-Start Current Ramping Foldback Output Current Limiting Latched Short-Circuit Shutdown with Defeat Option Output Overvoltage Protection Remote Output Voltage Sense Low Shutdown IQ: 20mA 5V and 3.3V Standby Regulators Selectable Constant Frequency or Burst Mode® Operation Available in 5mm ´ 5mm QFN and 28-Pin SSOP Packages Applications: Notebook and Palmtop Computers, PDAs Battery Chargers Portable Instruments Battery-Operated Digital Devices DC Power Distribution Systems
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