LTC7130 datasheet(9/36 Pages) LINER

9 / 36 page

LTC7130

7130fb

For more information www.linear.com/LTC7130

PIN FUNCTIONS

SVIN (D5): Main Input Supply. Decouple this pin to PGND

with a capacitor (0.1μF to 1μF). For applications where

the main input power is 5V, tie the SVIN and INTVCC pins

together.

VIN (E4, E5, E6, E7, F4, F5, F6, F7, G7): Main Input

Supply. These pins connect to the drain of the internal

power MOSFETs. Decouple this pin to GND with the input

capacitance CIN.

EXTVCC (D7): External Supply Voltage Input. Whenever

an external voltage supply greater than 4.7V is connected

to this pin, an internal switch will close and bypass the

internal low dropout regulator, and the external supply will

power the IC. Do not exceed 6V on this pin and ensure

VIN > VEXTVCC at all times.

ITEMP (D6): Temperature DCR Compensation Input. Con-

nect to a NTC (negative tempco) resistor placed near the

output inductor to compensate for its DCR change over

temperature. Floating this pin or tying it to INTVCCdisables

the DCR temperature compensation function.

PGOOD (C7): Power Good Indicator Output. Open-drain

logic out that is pulled to ground when the output exceeds

the 10% regulation window, after the internal 20μs power

bad mask timer expires.

MODE/PLLIN (C6): Mode Operation or External Clock

Synchronization. Connect this pin to SGND to set the

continuous mode of operation. Connect to INTVCC to en-

able pulse-skipping mode of operation. Leaving the pin

floating will enable Burst Mode operation. A clock signal

applied to the pin will force the controller into continuous

modeofoperationandsynchronizestheinternaloscillator.

SGND (B3, B4, C4, C5): Signal Ground. This is the ground

of the controller. Connect compensation components and

output setting resistors to this ground.

NC(A1,A7):Donotconnect.Thesepinsarenotconnected

to anything internally.

LTC7130 Datasheet(PDF) 9 Page - Linear Technology