LTM4677 datasheet(8/34 Pages) LINER

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LTM4647

4647fb

For more information www.linear.com/LTM4647

BLOCK DIAGRAM

PIN FUNCTIONS

VOSNS– (G5): Input to the Remote Sense Amplifier. This

pin connects to the ground remote sense point at the

output load.

VOSNS+ (G6): Input to the Remote Sense Amplifier. In-

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

precision resistor.

PGOOD (G7): Output Voltage Power Good Indicator.

Open-drain logic output that is pulled to ground when the

output voltage is not within ±7.5% of the regulation point.

COMPa (H6): Current Control Threshold and Error Am-

plifier Compensation Point. The current comparator

threshold increases with this control voltage. Small filter

capacitor (10pF) internal to LTM4647 on this pin provides

good noise rejection in the control loop. Tie to COMPb

pin to use internal compensation in the vast majority of

applications. Whereas, when more specialized applica-

tions require an optimization of control loop response,

connect an R-C compensation network from COMPa to

SGND. Tie COMPa pins together in parallel operation. See

the Applications Information section.

COMPb(H7):InternalLoopCompensationNetworks.Tieto

COMPatoprovideinternalloopcompensationformajority

of applications. Float this pin if internal loop compensation

not used. See COMPa description.

VOUT (J1-J4, K1-K4, L1-L7): Power Output Pins. Apply

outputloadbetweenthesepinsandGNDpins.Recommend

placing output decoupling capacitance directly between

these pins and GND pins. See Table 1.

TEMP+ (F1): Temperature Monitor. An internal diode con-

nected PNP transistor. See the Applications Information

section.

TEMP– (E1):LowSideoftheInternalTemperatureMonitor.

Figure 1. Simplified LTM4647 Block Diagram

0.12µH

1µF

60.4k

90.9k

4647 F01

RFREQ

47.5k

VOUT

CIN

COUT

GND

VSNS–

VSNS+

VFB

INTVCC

VIN

PGOOD

CLKOUT

HIZB

RUN

COMPa

2.2

COMPb

INTVCC

POWER

CONTROL

2.2µF

VIN

6V TO 15V

VOUT

30A

10pF

0.1µF

4.7µF

0.1µF

3300pF

PHASMD

SVIN

DIFF

AMP

FREQ

SGND

INTVCC

DVRVCC

TRACK/SS

MODE/PLLIN

47pF

1µF

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