LTM4650 datasheet(11/38 Pages) AD

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LTM4652

Rev. 0

For more information www.analog.com

PIN FUNCTIONS

allowing the output voltage to rise high enough (~10%

above nominal regulation) to induce an output overvolt-

age response. Transient and sustained operation in this

manner is strongly not recommended.

Thus, in applications where transient and/or sustained

negative (sinking) output current is expected, the

LTM4652 must be operated in forced continuous mode.

RUN1, RUN2 (Pins F5, F9): Run Control Pin. A voltage

above 1.22V will turn on each channel in the module. A

voltage below 1.085V (135mV hysteresis, typ.) on the

RUN pin will turn off the related channel. Each RUN pin

has a 1µA pull-up current, once the RUN pin reaches

1.22V an additional 4.5µA pull-up current is added to

this pin.

DIFFOUT (Pin F8): Internal Remote Sense Amplifier

Output. Connect this pin to VOUTS1 or VOUTS2 depend-

ing on which output is using remote sense. In parallel

operation connect one of the VOUTS pin to DIFFOUT for

remote sensing.

SW1, SW2 (Pins G2, G11): Switching node of each chan-

nel that is used for testing purposes. Also an R-C snubber

network can be applied to reduce or eliminate switch node

ringing, or otherwise leave floating. See the Applications

Information section.

PHASMD (Pin G4): Connect this pin to SGND, INTVCC,

or floating this pin to select the phase of CLKOUT to 60

degrees, 120 degrees, and 90 degrees respectively.

CLKOUT (Pin G5): Clock output with phase control using

the PHASMD pin to enable multiphase operation between

devices. See the Applications Information section.

PGOOD1, PGOOD2 (Pins G9, G8): Output Voltage Power

Good Indicator. Open drain logic output that is pulled to

ground when the output voltage is not within ±10% of

the regulation point.

VINOVP (Pin H5): VIN Overvoltage Protection (OVP)

Comparator Input. Internally, this pin connects to SGND

through a 60.4k resistor. If desired, apply resistor RVINOVP

from VIN to VINOVP to set VIN(OVP), the VIN overvoltage

inception threshold. VIN(OVP) is given by Equation 1.

60.4k

VIN(OVP) = 1.22V • 1 +

RVINOVP

(1)

See Figure 1 and the Applications Information section.

When VINOVP is detected (VVINOVP > 1.22V), all power

MOSFETs in both channels are turned off and remain off

until the module is restarted. The module can be restarted

by either cycling the RUN pins below their RUN thresholds

or cycling the TRACK pins to SGND. Leave VINOVP open

circuit or connect to SGND when this feature is not used.

TEMP– (Pin H6): Temperature Monitor, Negative Terminal.

See TEMP+.

INTVCC (Pin H8): Internal 5V Regulator Output. The con-

trol circuits and internal gate drivers are powered from

this voltage. Decouple this pin to PGND with a 4.7µF low

ESR tantalum or ceramic. INTVCC is activated when either

RUN1 or RUN2 is activated.

TEMP+ (Pin J6): Temperature Monitor, Positive Terminal.

An internal diode-configured PNP transistor connected

between TEMP+ and TEMP– pins. See the Applications

Information section.

EXTVCC (Pin J7): External power input that is enabled

through a switch to INTVCC whenever EXTVCC is greater

than 4.7V. Do not exceed 6V on this input, and connect

this pin to VIN when operating VIN on 5V. An efficiency

increase will occur, corresponding to a power loss reduc-

tion of (VIN – INTVCC) multiplied by power MOSFET driver

current. Typical current requirement is 30mA. VIN must

be applied before EXTVCC, and EXTVCC must be removed

before VIN.

VIN (Pins M2–M11, L2–L11, J2–J4, J9–J11, K2–K4,

K9–K11): Power Input Pins. Apply input voltage between

these pins and GND pins. Recommend placing input

decoupling capacitance directly between VIN pins and

GND pins.

Heat Sink (Top Exposed Metal): The top exposed metal

is electrically unconnected.

(Recommended to use test points to monitor signal pin connections.)

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