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LTM4628 Datasheet(PDF) 8 Page - Linear Technology |
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LTM4628 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 36 page  LTM4628 8 4628fe For more information www.linear.com/LTM4628 PIN FUNCTIONS TRACK1, TRACK2 (E5, D8): Output Voltage Tracking Pin and Soft-Start Inputs. Each channel has a 1.3µA pull-up current source. When one channel is configured to be master of the two channels, then a capacitor from this pin to ground will set a soft-start ramp rate. The remaining channel can be set up as the slave, and have the master’s output applied through a voltage divider to the slave out- put’s track pin. This voltage divider is equal to the slave output’s feedback divider for coincidental tracking. See the Applications Information section. COMP1, COMP2 (E6, E7): Current control threshold and error amplifier compensation point for each channel. The current comparator threshold increases with this control voltage. Tie the COMP pins together for parallel operation. The device is internal compensated. DIFFP (E8): Positive input of the remote sense amplifier. Thispinisconnectedtotheremotesensepointoftheoutput voltage. Use of the remote sense amplifier is limited to an outputvoltagebetween0.6Vand3.3Vinclusive.Connectto GND if not used. See the Applications Information section. DIFFN (E9): Negative input of the remote sense amplifier. This pin is connected to the remote sense point of the output GND. See the Applications Information section. MODE_PLLIN (F4): Force Continuous Mode, Burst Mode Operation, or Pulse-Skipping Mode Selection Pin and External Synchronization Input to Phase Detector Pin. Connect this pin to SGND to force both channels into force continuous mode of operation. Connect to INTVCC to enable pulse-skipping mode of operation. Leaving the pin floating will enable Burst Mode operation. A clock on the pin will force both channels into continuous mode of operation and synchronized to the external clock applied to this pin. RUN1, RUN2 (F5, F9): Run Control Pin. A voltage above 1.25V will turn on each channel in the module. A voltage below 1.25V on the RUN pin will turn off the related chan- nel. Each RUN pin has a 1µA pull-up current, once the RUN pin reaches 1.2V an additional 4.5µA pull-up current is added to this pin. DIFFOUT (F8): Internal Remote Sense Amplifier Output. Connect this pin to VOUTS1 or VOUTS2 depending on which output is using remote sense. In parallel operation con- nect one of the VOUTS pin to DIFFOUT for remote sensing. Leave floating if the remote sense amplifier is not used. SW1, SW2 (G2, G11): Switching node of each channel that is used for testing purposes. Also an R-C snubber network can be applied to reduce or eliminate switch node ringing, otherwise leave floating. See the Applications Information section. PHASMD(G4):ConnectthispintoSGND,INTVCC,orfloat- ing this pin to select the phase of CLKOUT to 60 degrees, 120 degrees, and 90 degrees respectively. CLKOUT (G5): Clock output with phase control using the PHASMD pin to enable multiphase operation between devices. See the Applications Information section. PGOOD1, PGOOD2 (G9, G8): 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. INTVCC (H8): Internal 5V Regulator Output. The control circuits and internal gate drivers are powered from this voltage. INTVCC is controlled and enabled when RUN1 or RUN2 is activated high. Decouple this pin to PGND with a 4.7µF low ESR tantalum or ceramic. TEMP (J6): Onboard Temperature Diode for Monitoring the VBE Junction Voltage Change with Temperature. See the Applications Information section. EXTVCC (J7): External power input that is enabled through a switch to INTVCCwhenever 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 that is a function of the (VIN – INTVCC) multiplied by powerMOSFETdrivercurrent.Typicalcurrentrequirement is 30mA. VIN must be applied before EXTVCC, and EXTVCC must be removed before VIN. VIN (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. (Recommended to Use Test Points to Monitor Signal Pin Connections.) |
Similar Part No. - LTM4628_15 |
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Similar Description - LTM4628_15 |
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