LTM4650A datasheet(10/36 Pages) AD

10 / 36 page

LTM4671

Rev. B

For more information www.analog.com

PIN FUNCTIONS

VIN (D7-D11, E8, H6, J5-J6, L5-L6, M6, R10, T7-T11):

Power Input. Pins connect to the drain of the internal top

MOSFET and Signal VIN to the internal 3.3V regulator for

the control circuitry for each switching mode regulator

channel.ApplyinputvoltagesbetweenthesepinsandGND

pins. Recommend placing input decoupling capacitance

directly between each of VIN pins and GND pins.

GND (A4-A5, A8-A11, B4-B11, C4-C11, D4-D6, E3-E5,

F1-F7, G1-G6, G10, H5, H7, J7, J9, K1-K7, K11, L7,

L11, M5, M7, M10, N1-N6, P1-P5, P11, R3-R5, T4-T6,

U4-U11, V4-V11, W4-W5, W8-W11): Power Ground Pins

for Both Input and Output Returns. Use large PCB copper

areas to connect all GND together.

PINS FOR DUAL 12A CHANNELS:

VOUT0 (A1-A3, B1-B3, C1-C3, D1-D3, E1-E2), VOUT3

(R1-R2, T1-T3, U1-U3, V1-V3, W1-W3): Power Output

Pins of Each 12A Switching Mode Regulator Channel.

Apply output load between these pins and GND pins. Rec-

ommend placing output decoupling capacitance directly

between these pins and GND pins. See the Applications

Information section for paralleling outputs.

PGOOD0 (E11), PGOOD3 (R7): Output Power Good with

Open-Drain Logic of Each 12A Switching Mode Regulator

Channel. PGOOD is pulled to ground when the voltage on

theFBpinisnotwithin±10%oftheinternal0.6Vreference.

INTVCC0 (E7), INTVCC3 (R11): Internal 3.3V Regulator

Output of Each 12A Switching Mode Regulator Channel.

The internal power drivers and control circuits are pow-

ered from this voltage. Decouple each pin to GND with a

minimum of 2.2µF local low ESR ceramic capacitor.

RUN0 (F11), RUN3 (P7): Run Control Input of Each 12A

Switching Mode Regulator Channel. Enable regulator

operation by tying the specific RUN pin above 1.2V. Tying

it below 1.1V shuts down the specific regulator channel.

COMP0a (H10), COMP3a (N9): Current Control Thresh-

old and Error Amplifier Compensation Point of Each 12A

Switching Mode Regulator Channel. The internal current

comparatorthresholdislinearlyproportionaltothisvoltage.

Tie the COMPa pins from different channels together for

parallel operation. The device is internally compensated.

Connect to COMP0b or COMP3b, respectively, to use the

internal compensation. Or connect to a Type-II C-R-C

network to use customized compensation.

COMP0b (H11), COMP3b (N8): Internal Loop Compen-

sation Network for Each 12A Switching Mode Regulator

Channel. Connect to COMP0a or COMP3a, respectively, to

use the internal compensation in majority of applications.

FB0 (G9), FB3 (N10): The Negative Input of the Error

AmplifierforEach12ASwitchingModeRegulatorChannel.

This pin is internally connected to VOSNS0+ or VOSNS3+,

respectively, with a 60.4kΩ precision resistor. Output

voltages can be programmed with an additional resistor

between FB and VOSNS– pins. In PolyPhase® operation,

tying the FB pins together allows for parallel operation.

See the Applications Information section for details.

TRACK/SS0 (F9), TRACK/SS3 (P9): Output Tracking and

Soft-Start Pin of Each 12A 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 ampli-

fier, instead it servos the FB pin to the TRACK voltage.

Above 0.6V, the tracking function stops and the internal

reference resumes control of the error amplifier. There’s

an internal 6µA pull-up current from INTVCC on this pin,

so putting a capacitor here provides soft-start function.

See the Applications Information section for details.

PACKAGE ROW AND COLUMN LABELING MAY VARY

AMONG µModule PRODUCTS. REVIEW EACH PACKAGE

LAYOUT CAREFULLY.

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