LTC1874 datasheet(4/12 Pages) LINER

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LTC1874

PIN FUNCTIONS

VIN1 (Pin 1): Main Supply Pin for Controller #1. This pin

delivers the Input DC Supply Current (listed in the Electri-

cal Characteristics table) plus a small amount of logic

switching current. Must be connected to PVIN1 (Pin 16)

and closely decoupled to GND1 (Pin 3).

SENSE1– (Pin 2): The Negative Input to the Current

Comparator of Controller #1.

GND1 (Pin 3): Signal Ground for Controller #1. Must be

connected to PGND1 (Pin 14).

VFB1 (Pin 4): Receives the feedback voltage from an

external resistive divider across the output of Controller

#1.

ITH/RUN2 (Pin 5): This pin performs two functions. It

serves as the error amplifier compensation point as well as

the run control input of Controller #2. The current com-

parator threshold increases with this control voltage.

Nominal voltage range for this pin is 0.7V to 1.9V. Forcing

this pin below 0.35V causes Controller #2 to be shut down.

In shutdown, all functions of Controller #2 are disabled

and PGATE2 (Pin 7) is held high.

PGND2 (Pin 6): Power Ground for Controller #2. Must be

connected to GND2 (Pin 11).

PGATE2 (Pin 7): Gate Drive for the External P-Channel

MOSFET of Controller #2. This pin swings from 0V to the

voltage of PVIN2.

PVIN2 (Pin 8): Power Supply Pin for Controller #2. This pin

delivers the dynamic switching current that drives the gate

of the external P-channel MOSFET of Controller #2. Must

be connected to VIN2 (Pin 9) and closely decoupled to

PGND2 (Pin 6).

VIN2 (Pin 9): Main Supply Pin for Controller #2. This pin

delivers the Input DC Supply Current (listed in the Electri-

cal Characteristics table) plus a small amount of logic

switching current. Must be connected to PVIN2 (Pin 8) and

closely decoupled to GND2 (Pin 11).

SENSE2– (Pin 10): The Negative Input to the Current

Comparator of Controller #2.

GND2 (Pin 11): Signal Ground for Controller #2. Must be

connected to PGND2 (Pin 6).

VFB2 (Pin 12): Receives the feedback voltage from an

external resistive divider across the output of Controller

#2.

ITH/RUN1 (Pin 13): This pin performs two functions. It

serves as the error amplifier compensation point as well as

the run control input of Controller #1. The current com-

parator threshold increases with this control voltage.

Nominal voltage range for this pin is 0.7V to 1.9V. Forcing

this pin below 0.35V causes Controller #1 to be shut down.

In shutdown, all functions of Controller #1 are disabled

and PGATE1 (Pin 15) is held high.

PGND1 (Pin 14): Power Ground for Controller #1. Must be

connected to GND1 (Pin 3).

PGATE1 (Pin 15): Gate Drive for the External P-Channel

MOSFET of Controller #1. This pin swings from 0V to the

voltage of PVIN1.

PVIN1 (Pin 16): Power Supply Pin for Controller #1. This

pin delivers the dynamic switching current that drives the

gate of the external P-channel MOSFET of Controller #1.

Must be connected to VIN1 (Pin 1) and closely decoupled

to PGND1 (Pin 14).

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