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LTM4661 Arkusz danych(PDF) 6 Page - Linear Technology

Numer części LTM4661
Szczegółowy opis  15V, 4A Step-Up 關Module Regulator
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Producent  LINER [Linear Technology]
Strona internetowa  http://www.linear.com
Logo LINER - Linear Technology

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LTM4661
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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.


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