LT1942(RevA) 데이터 시트보기 (PDF) - Linear Technology

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LT1942
(Rev.:RevA)

Quad DC/DC Converter for Triple Output TFT Supply Plus LED Driver

Linear Technology 

LT1942

PI FU CTIO S

LED1 (Pin 18): First Input of Current Mirror for an LED

String. Connect the negative end of first string of LEDs to

this pin. If not in use, leave floating.

SW4 (Pin 19): Switch Pin for LED Switcher. This is the

collector of an internal NPN power switch. Minimize the

metal trace area connected to this pin to minimize EMI.

SW1 (Pin 20): Switch Pin for AVDD Switcher. This is the

collector of an internal NPN Power switch. Minimize the

metal trace area connected to this pin to minimize EMI.

PGND14 (Pin 21): Power Ground for LED Switcher and

AVDD Switcher. Tie directly to local ground plane.

VCC (Pin 22): Input Supply. Must be locally bypassed.

D2 (Pin 23): Anode Connection of Internal Schottky Diode

for VOFF Switcher.

SW2 (Pin 24): Switch Pin for VOFF Switcher. This is the

collector of an internal NPN Power switch. Minimize the

metal trace area connected to this pin to minimize EMI.

SGND (Pin 25): Signal Ground. This is the Exposed Pad,

which must be soldered directly to a local ground plane to

achieve optimum thermal performance.

1942fa

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