LTM4650A datasheet(12/36 Pages) AD

12 / 36 page

LTM4671

Rev. B

For more information www.analog.com

FB1 (H9), FB2 (M9): The Negative Input of the Error

Amplifier for Each 5A Switching Mode Regulator Channel.

This pin is internally connected to VOSNS1 or VOSNS2,

respectively, with a 60.4kΩ precision resistor. Output

voltages can be programmed with an additional resistor

between FB and GND pins. In PolyPhase operation, tying

the FB pins together allows for parallel operation. See the

Applications Information section for details.

TRACK/SS1 (G7), TRACK/SS2 (N7): Output Tracking

and Soft-Start Pin of Each 5A Switching Mode Regulator

Channel. Allows the user to control the rise time of the

output voltage. Putting a voltage below 0.6V on this pin

bypasses the internal reference input to the error amplifier,

instead it servos the FB pin to the TRACK voltage. Above

0.6V,thetrackingfunctionstopsandtheinternalreference

resumes control of the error amplifier. There’s an internal

1.4µA pull-up current from INTVCC on this pin, so putting

a capacitor here provides soft-start function. See the Ap-

plications Information section for details.

FREQ12(K10):SwitchingFrequencyProgramPinforBoth

5A Switching Mode Regulator Channels. Frequency is

set internally to 1MHz. An external resistor can be placed

from this pin to GND to increase frequency, or from this

pin to INTVCC to reduce frequency. See the Applications

Information section for frequency adjustment.

VOSNS1 (J10), VOSNS2 (L10): Output Voltage Sense Pin

of Each 5A Switching Mode Regulator Channel. Internally,

this pin is connected to VFB with a 60.4k 0.5% precision

resistor. See the Applications Information section for

details. It is very important to connect these pins to the

VOUT since this is the feedback path, and cannot be left

open. See the Applications Information section for details.

MODE/CLKIN12 (L9): Mode Select and External Synchro-

nization Input Pin for Both 5A Switching Mode Regulator

Channels. Tie this pin to GND to force continuous synchro-

nous operation. Floating this pin or tying it to INTVCC12

enables high efficiency Burst Mode operation at light

loads. When driving this pin with an external clock, the

phase-locked loop will force the channel 1 turn on signal

to be synchronized with the rising edge of the CLKIN12

signal. channel 2 will also be synchronized with the rising

edge of the CLKIN12 signal with a 180° phase shift. See

Applications Information section for details.

TMON(K8):TemperatureMonitorfor5AOutputChannels.

Avoltageproportionaltothemeasuredon-dietemperature

will appear at this pin. The voltage-to-temperature scaling

factoris200°K/V.SeetheApplicationsInformationsection

for detailed information on the TMON function. Tie this pin

to INTVCC12 to disable the temperature monitor circuit.

PIN FUNCTIONS

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