LTM4643 datasheet(11/43 Pages) AD

11 / 43 page

Data Sheet

LTM8060F

analog.com

Rev. 0

11 of 43

NAME

DESCRIPTION

CFG 1

K8,

K9,

F4, F3

SHARE1−SHARE4

Channel 1 through Channel 4 Current Sharing Control. Connect SHAREn together

when paralleling outputs. The LTM8060F can also share current between modules.

See the Typical Applications section for current sharing between channels and

current sharing between modules.

K11,

K10,

F1, F2

FB1−FB4

The LTM8060F regulates the FBn pin to 800mV. Connect the feedback resistor to

these pins to set the output voltage.

L11,

RT12, 34

Connect a resistor between RTn and ground to set the switching frequency. Do not

drive these pins.

M10,

BIAS12, 34

The internal regulator will draw current from BIASn instead of VIN1 or VIN34 when

BIASn is connected to a voltage higher than 3.2V. For output voltages of 3.3V and

above, these pins should be connected to VOUTn. If these pins are connected to a

supply other than VOUTn, use a local bypass capacitor on these pins.

N10,

L10,

C2, E2

AUX1−AUX4

Low Current Voltage Source for BIAS. In many designs, the BIAS pin is simply

connected to VOUT via the AUX pin. The AUXn pins are internally connected to VOUTn

and placed adjacent to the BIASn pins to ease printed circuit board routing.

Although these pins are internally connected to VOUT, they are not intended to

deliver a higher current, so do NOT connect these pins to the load. If these pins are

not connected to BIAS, leave them floating.

N11,

M11

TRSS1, 2

Output Tracking and Soft Start Pins. These pins allow the user to control the output

voltage ramp rate during startup. A TRSSn voltage below 0.8V forces the LTM8060F

to regulate the FBn pin to equal the TRSSn pin voltage. When TRSSn is above 0.8V,

the tracking function is disabled, and the internal reference resumes control of the

error amplifier. An internal 2μA pull-up current on these pins allow a capacitor to

program output voltage slew rate. These pins are pulled to ground during shutdown

and fault conditions; use a series resistor if driving from a low impedance output.

These pins may be left floating if the soft start feature is not being used.

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