LTM8049 datasheet(6/20 Pages) LINER

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LTM4661

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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