LTC1143CS datasheet(6/20 Pages) LINER

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LTC1143/LTC1143L

LTC1143L-ADJ

PIN FUNCTIONS

VIN3 (Pin 13): Supply Pin, 3.3V Section. Must be closely

decoupled to 3.3V power ground Pin 3.

CT3 (Pin 14): External capacitor CT3 from Pin 14 to ground

sets the operating frequency for the 3.3V section. (The

actual frequency is also dependent upon the input voltage.)

ITH3 (Pin 15): Gain Amplifier Decoupling Point, 3.3V

Section. The 3.3V section current comparator threshold

increases with the Pin 15 voltage.

SENSE– 3 (Pin 16): Connects to internal resistive

divider which sets the output voltage for the 3.3V

section. Pin 16 is also the (–) input for the current

comparator on the 3.3V section.

LTC1143L-ADJ

SENSE+ 1 (Pin 1): The (+) Input to the Section 1 Current

Comparator. A built-in offset between Pins 1 and 16 in

conjunction with RSENSE 1 sets the current trip threshold

for section 1.

VFB1 (Pin 2): This pin serves as the feedback pin from an

external resistive divider used to set the output voltage for

section 1.

GND1 (Pin 3): Section 1 Ground. Two independent ground

lines must be routed separately from other grounds to: 1)

the (–) terminal of the section 1 output capacitor and 2) the

cathode of the Schottky diode D1 and (–) terminal of CIN1

(see Figure 1).

P-DRIVE 1 (Pin 4): High Current Drive for Top P-Channel

MOSFET, Section 1. Voltage swing at this pin is from VIN1

to ground.

VIN2 (Pin 5): Supply Pin, Section 2. Must be closely

decoupled to power ground Pin 11.

CT2 (Pin 6): External capacitor CT2 from Pin 6 to ground sets

the operating frequency for section 2. (The actual frequency

is also dependent upon the input voltage.)

ITH2 (Pin 7): Gain Amplifier Decoupling Point, Section 2.

The section 2 current comparator threshold increases

with the Pin 7 voltage.

SENSE– 2 (Pin 8): Pin 8 is the (–) input for the current

comparator on section 2.

SENSE+ 2 (Pin 9): The (+) Input to the Section 2 Current

Comparator. A built-in offset between Pins 9 and 8 in

conjunction with RSENSE 2 sets the current trip threshold

for section 2.

VFB2 (Pin 10): This pin serves as the feedback pin from an

external resistive divider used to set the output voltage for

section 2.

GND2 (Pin 11): Section 2 Ground. Two independent

ground lines must be routed separately from other grounds

to: 1) the (–) terminal of section 2 output capacitor and 2)

the cathode of the Schottky diode D2 and (–) terminal of

CIN2 (see Figure 1).

P-DRIVE 2 (Pin 12): High Current Drive for Top P-Channel

MOSFET, Section 2. Voltage swing at this pin is from VIN2

to ground.

VIN1 (Pin 13): Supply Pin, Section 1. Must be closely

decoupled to power ground Pin 3.

CT1 (Pin 14): External capacitor CT1 from Pin 14 to ground

sets the operating frequency for section 1. (The actual

frequency is also dependent upon the input voltage.)

ITH1 (Pin 15): Gain Amplifier Decoupling Point, Section 1.

The section 1 current comparator threshold increases

with the Pin 15 voltage.

SENSE– 1 (Pin 16): Pin 16 is the (–) input for the

current comparator on section 1.

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