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LTM4661 Arkusz danych(PDF) 6 Page - Linear Technology |
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LTM4661 Arkusz danych(HTML) 6 Page - Linear Technology |
6 / 20 page LTM4661 6 4661f For more information www.linear.com/LTM4661 PIN FUNCTIONS VIN (A1, B1, C1, D1, E1): Power Input Pins. Apply input voltage between these pins and GND pins. Recommend placing input decoupling capacitance directly between VIN pins and GND pins. VOUT (A4, A5, B5, C5): Power Output Pins of the Switch- ing Mode Regulator. Apply output load between these pins and GND pins. Recommend placing output decoupling capacitance directly between these pins and GND pins. GND (A2, A3, B2 to B4, C2 to C4, D4, E2): Power Ground Pins for Both Input and Output Returns. SYNC/MODE (D2): Burst Mode Operation Selection Pin and External Synchronization Input to Phase Detector Pin. Connect this pin to INTVCC to operate the module in forced continuous mode. Connect this pin to GND to enable Burst Mode operation. A clock more than 100ns on the pin will force the module operating in continuous mode and synchronized to the external clock applied to this pin. The external clock frequency must be higher than the self-running frequency programmed by FREQ pin. See frequency programming in the Applications Information section. INTVCC(D3):InternalRegulatorOutput.Theinternalpower drivers and control circuits are powered from this volt- age. Decouple this pin to power ground with a minimum of 2.2µF low ESR ceramic capacitor. The INTVCC voltage is regulated at the lower of VIN and 4.25V. When VIN falls below 3V and VOUT is higher than VIN, INTVCC will regulate to the lower of approximately VOUT and 4.25V. A UVLO event occurs if INTVCC drops below 1.5V, typical. FREQ (E3): Frequency Set Internally to 1MHz. An external resistor can be placed from this pin to ground to increase frequency or from this pin to INTVCC to reduce frequency. See the Applications Information section for frequency adjustment. SDB (D5): Shutdown Control Input of the µModule Regulator. Pulling this pin above 1.6V enables normal, free-running operation. Forcing this pin below 0.25V shuts the regulator off, with quiescent current below 1µA. Do not leave this pin floating. COMP(E4):CurrentControlThresholdandErrorAmplifier Compensation Point of the Switching Mode Regulator. Tie the COMP pins together for parallel operation. The device is internal compensated. FB (E5): The Negative Input of the Error Amplifier for the SwitchingModeRegulator.Internally,thispinisconnected to VOUT with a 100kΩ 0.5% precision resistor. Different output voltages can be programmed with an additional resistorbetweenFBandGNDpins.InPolyPhaseoperation, tyingtheFBpinstogetherallowsforparalleloperation.See the Applications Information section for details. |
Podobny numer części - LTM4661 |
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Podobny opis - LTM4661 |
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