PT4205 datasheet(2/18 Pages) POWTECH

2 / 18 page

30V, 1.2A Step-down HB LED Driver

China Resources Powtech (Shanghai) Limited

WWW.CRPOWTECH.COM

Page 2

PT4205_DS Rev EN_1.2

PT4205

PIN ASSIGNMENT

PIN DESCRIPTIONS

PIN No.

NAMES

DESCRIPTION

Switch Output. SW is the drain of the internal N-Ch MOSFET switch.

GND

Signal and power ground. Connect directly to ground plane.

DIM

Logic level dimming input. Drive DIM low to turn off the current regulator.

Drive DIM high to enable the current regulator.

CSN

Current sense input

VIN

Input Supply Pin. Must be locally bypassed.

Exposed

PAD

Internally connected to GND. Mount on board for lower thermal resistance.

ESOP8 4,5,7

No connection

ABSOLUTE MAXIMUM RATINGS (note1)

SYMBOL

ITEMS

VALUE

UNIT

VIN

Supply Voltage

-0.3~40

Drain of the internal power switch

-0.3~40

CSN

Current sense input (Respect to VIN)

+0.3~(-6.0)

DIM

Logic level dimming input

-0.3~30

ISW

Switch output current

1.5

PDMAX

Power Dissipation (Note 2)

1.5

PTR

Thermal Resistance, SOT89-5 (θJA)

oC /W

PTR

Thermal Resistance, ESOP8 (θJA)

oC /W

Operation Junction Temperature Range

-40 to 150

TSTG

Storage Temperature

-55 to 150

ESD(note3)

HBM

CSN

VIN

GND

DIM

ESOP8

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