LTM8065 datasheet(10/43 Pages) AD

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Data Sheet

LTM8060F

analog.com

Rev. 0

10 of 43

NAME

DESCRIPTION

CFG 1

Bank

VIN2

Input Power for the Channel 2 Regulator. Decouple VIN2 to ground with an external

low Equivalent series resistance (ESR) capacitor. See Table 6 for recommended

values.

Bank

VIN34

Input Power for the Channel 3 and Channel 4 Regulator. The VIN34 bank powers the

internal control circuitry for both Channel 3 and Channel 4 and is monitored by

undervoltage lockout circuitry. The VIN34 voltage must be greater than 3V for either

Channel 3 or Channel 4 of the LTM8060F to operate. Decouple VIN34 to ground with

an external low-ESR capacitor. See Table 6 for recommended values.

Bank

VIN1

Input Power for the Channel 1 Regulator. The VIN1 powers the internal control

circuitry for Channel 1 and Channel 2 and is monitored by undervoltage lockout

circuitry. The VIN1 voltage must be greater than 3V for either Channel 1 or Channel 2

of the LTM8060F to operate. Decouple VIN1 to ground with an external low-ESR

capacitor. See Table 6 for recommended values.

Banks

8, 3, 1,

VOUT1−OUT4

Power Output for Channel 1, through Channel 4, respectively. Apply the output filter

capacitor and the output load between these pins and the GND plane.

C10,

CLKOUT12, 34

Synchronization Output. When SYNC12, 34 > 2.8V, the CLKOUT12, 34 pins provide a

waveform about 90° out-of-phase with Channel 1 and Channel 3, respectively. This

allows synchronization with other regulators with up to four phases. When an

external clock is applied to the SYNC12, 34 pins, the CLKOUT12, 34 pins will output a

waveform with about the same phase, duty cycle, and frequency as the SYNC12, 34

waveform. In Burst Mode® operation, the CLKOUT12, 34 pins will be internally

grounded. Float these pins if the CLKOUT12, 34 function is not used. Do not drive

these pins.

C11,

SYNC12, 34

External Clock Synchronization Input. Ground these pins for low ripple Burst Mode

operation at low output loads; this will also disable the CLKOUT function. Apply a

DC voltage between 2.8V and 4V for forced continuous mode (FCM) operation with

spread spectrum modulation. Float the SYNCn pin for FCM operation without spread

spectrum modulation. Apply a clock source to the SYNCn pin for synchronization to

an external frequency. The LTM8060F will be in FCM when an external frequency is

applied.

E9,

D10,

L3, M2

PG1−PG4

The PGn pins are the open-drain output of an internal comparator. The PGn pin

remains low until the FBn pin is within ±7.5% of the final regulation voltage, and

until there are no fault conditions. The PGn pin is pulled low during VINn UVLO,

thermal shutdown, or when the RUNn pins are low.

E10,

DNC

Do not connect these pins.

E11,

D11,

L1, M1

RUN1−RUN4

The corresponding channel of the LTM8060F is shut down when these pins are low

and active when these pins are high. Connect to VINn if the shutdown feature is not

used. An external resistor divider from VINn can be used to program a VINn threshold

below which the corresponding channel of the LTM8060F will shut down. Do not

float these pins.

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