LT7200SAVPBF datasheet(7/35 Pages) AD

7 / 35 page

Data Sheet

LT7200S

analog.com

Rev 0

7 of 35

32, 33

SW3

Channel 3 Switch Node Connection of External Inductor. Voltage swing of SW3 is from

a diode voltage drop below ground to a diode voltage above PVIN3.

30, 31

SW4

Channel 4 Switch Node Connection of External Inductor. Voltage swing of SW4 is from

a diode voltage drop below ground to a diode voltage above PVIN4.

SVIN

Signal VIN. Filtered input voltage to the on-chip 5V regulator. Bypass signal into the SVIN

pin with a 1µF ceramic capacitor.

MODE/SYNC

Mode Selection and Oscillator Synchronization Pin. Tie MODE/SYNC to GND for

Discontinuous Mode (DCM). Floating MODE/SYNC or tying it to a voltage above 1V

selects Forced Continuous Mode (FCM). Furthermore, connecting MODE/SYNC to an

external clock synchronizes the system clock to the external clock and puts the part in

Forced Continuous Mode (FCM). The synchronization is +/- 30% of the frequency set by

the external resistor RRT connected at RT pin.

TRACK1

Channel 1 Output Tracking and Soft-Start Pin. Allows to control the rise time of the

output voltage. Connecting a voltage between 0V to 0.5V on this pin relative to GND

bypasses error amplifier’s internal reference input. Instead, it servos the FB pin to that

voltage. There’s an internal 5µA pullup current from INTVCC to this pin; putting a

capacitor from this pin to GND provides soft-start function.

TRACK2

Channel 2 Output Tracking and Soft-Start Pin. Allows to control the rise time of the

output voltage. Connecting a voltage between 0V to 0.5V on this pin relative to GND

bypasses error amplifier’s internal reference input. Instead, it servos the FB pin to that

voltage. There’s an internal 5µA pullup current from INTVCC to this pin; putting a

capacitor from this pin to GND provides soft-start function.

TRACK3

Channel 3 Output Tracking and Soft-Start Pin. Allows to control the rise time of the

output voltage. Connecting a voltage between 0V to 0.5V on this pin relative to GND

bypasses error amplifier’s internal reference input. Instead, it servos the FB pin to that

voltage. There’s an internal 5µA pullup current from INTVCC to this pin; putting a

capacitor from this pin to GND provides soft-start function.

TRACK4

Channel 4 Output Tracking and Soft-Start Pin. Allows to control the rise time of the

output voltage. Connecting a voltage between 0V to 0.5V on this pin relative to GND

bypasses error amplifier’s internal reference input. Instead, it servos the FB pin to that

voltage. There’s an internal 5µA pullup current from INTVCC to this pin; putting a

capacitor from this pin to GND provides soft-start function.

FB1

Channel 1 Feedback Input to the Error Amplifier of the Step-Down Regulator. LT7200S

regulates this pin to a 0.5V accurate internal reference voltage. Connect resistor

divider tap to this pin. The output voltage, VOUT, can be adjusted from 0.5V to 0.9 x VIN

by: VOUT = 0.5V x [1+(R2/R1)].

FB2

Channel 2 Feedback Input to the Error Amplifier of the Step-Down Regulator. LT7200S

regulates this pin to a 0.5V accurate internal reference voltage. Connect resistor

divider tap to this pin. The output voltage, VOUT, can be adjusted from 0.5V to 0.9 x VIN

by: VOUT = 0.5V x [1+(R2/R1)].

FB3

Channel 3 Feedback Input to the Error Amplifier of the Step-Down Regulator. LT7200S

regulates this pin to a 0.5V accurate internal reference voltage. Connect resistor

divider tap to this pin. The output voltage, VOUT, can be adjusted from 0.5V to 0.9 x VIN

by: VOUT = 0.5V x [1+(R2/R1)].

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