LTM4650-1 datasheet(7/36 Pages) LINER

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LTM4636

4636f

For more information www.linear.com/LTM4636

pin FuncTions

VOUT(A1-A12,B1-B12,C1-C12,D1-D2,D11-D12):Power

OutputPins.ApplyoutputloadbetweenthesepinsandGND

pins. Recommend placing output decoupling capacitance

between these pins and GND pins. Review Table 4.

MODE_PLLIN(H3):ForcedContinuousMode,BurstMode

Operation, or Pulse-Skipping Mode Selection Pin and

External Synchronization Input to Phase Detector Pin.

Connect this pin to INTVCC to enable pulse-skipping mode

ofoperation.Connecttogroundtoenableforcedcontinuous

modeofoperation.FloatingthispinwillenableBurstMode

operation. A clock on this pin will enable synchronization

with forced continuous operation. See the Applications

Information section.

VOUTS1– (D3): VOUT Sense Ground for the Remote Sense

Amplifier. This pin connects to the ground remote sense

point. Connect to ground when not used. See the Applica-

tions Information section.

VOUTS1+ (D4): This pin should connect to VOUT and is

connected to VFB through a 4.99k resistor. This pin is

used to connect to a remote sense point of the load for

accurate voltage sensing. Either connect to remote sense

point or directly to VOUT. See the Applications Information

section for details.

COMPB(D5):Internalcompensationnetworkprovidedthat

coincides with proper stability utilizing the values in Table

5. Just connect this pin to COMPA for internal compensa-

tion. In parallel operation with other LTM4636 devices,

connect COMPA and COMPB pins together for internal

compensation, then connect all COMPA pins together.

GND (D6-D10, E6-E10, E12, F7, F8, F10-F12, G1-G2, G6

G10, H1, H10-H12, J1-J3, J8-J12, K1-K3, K9-K10, K12,

L1-L3, L9-L10, L12, M1-M3, M9-M12): Ground Pins for

Both Input and Output Returns.

PGOOD(E1):OutputVoltagePowerGoodIndicator.Open-

drain logic output is pulled to ground when the output

voltage exceeds a ±7.5% regulation window.

RUNC (E2): Run Control Pin. A voltage above 1.35V will

turn on the control section of the module. A 10k resistor

to ground is internal to the module for setting the RUN

pin threshold with a resistor to 5V, and allowing a pull-

up resistor to PVCC for enabling the device. See Figure 1

Block Diagram.

TRACK/SS(E3):OutputVoltageTrackingPinandSoft-Start

Inputs. The pin has a 1.25µA pull-up current source. A

capacitor from this pin to ground will set a soft-start ramp

rate. In tracking, the regulator output can be tracked to a

differentvoltage.Thedifferentvoltageisappliedtoavoltage

divider then to the slave output’s track pin. This voltage

divider is equal to the slave output’s feedback divider for

coincidental tracking. Default soft-start of 750µs with

TRACK/SS pin connected to INTVCC pin. See the Applica-

tions Information section. In PolyPhase® applications tie

the TRACK/SS pins together.

VFB (E4): The Negative Input of the Error Amplifier. Inter-

nally,thispinisconnectedtoVOUTS1witha4.99kprecision

resistor. Different output voltages can be programmed

with an additional resistor between VFB and VOUTS1–. In

PolyPhaseoperation,tyingtheVFBpinstogetherallowsfor

paralleloperation.SeetheApplicationsInformationsection.

COMPA(E5):CurrentControlThresholdandErrorAmplifier

Compensation Point. The current comparator threshold

increases with this control voltage. Tie all COMPA pins

together for parallel operation. This pin allows external

compensation. See the Applications Information section.

SNSP2 (F1): Current Sense Signal Path. Connect this pin

to SNSP1 (F2).

SNSP1 (F2): Current Sense Signal Path. Connect this pin

to SNSP2 (F1). Both pins are used to calibrate current

sense matching and current limit at final test.

HIZREG (F3): When this pin is pulled low the power stage

is disabled into high impedance. Tie this pin to VIN or in

TVCC for normal operation.

PACKAGE ROW AND COLUMN LABELING MAY VARY

AMONG µModule PRODUCTS. REVIEW EACH PACKAGE

LAYOUT CAREFULLY.

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