LT1937 datasheet(2/24 Pages) LINER

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LT3498

3498f

PACKAGE/ORDER INFORMATION

ELECTRICAL CHARACTERISTICS

ABSOLUTE MAXIMUM RATINGS

Input Voltage (VIN)....................................................12V

CTRL1 and CTRL2 Voltage........................................12V

FB2 Voltage..............................................................2.5V

VOUT2 Voltage ...........................................................32V

SW1 and SW2 Voltage ..............................................32V

CAP1 and CAP2 Voltage............................................32V

LED1 Voltage ............................................................32V

Operating Junction Temperature Range ...– 40°C to 85°C

Maximum Junction Temperature .......................... 125°C

Storage Temperature Range...................– 65°C to 150°C

(Notes 1, 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Operating Voltage

2.5

Maximum Operating Voltage

Supply Current (LED Off, OLED Off)

VIN = 3V, VCTRL1 = 0V, VCTRL2 = 0V

810

µA

Supply Current (LED On, OLED Off)

VIN = 3V, VCTRL1 = 3V, VCTRL2 = 0V, VCAP1 = 24V,

VLED1 = 23V

1.6

Supply Current (LED Off, OLED On)

VIN = 3V, VCTRL1 = 0V, VCTRL2 = 3V, VFB2 = 3V

230

280

µA

Supply Current (LED On, OLED On)

VIN = 3V, VCTRL1 = 3V, VCTRL2 = 3V, VCAP1 = 24V,

VLED1 = 23V

1.65

2.05

VCTRL1 for Full LED Current

VCTRL2 for Full OLED Brightness

●

1.5

VCTRL1 or VCTRL2 to Turn On IC

●

125

VCTRL1 and VCTRL2 to Shut Down IC

●

CTRL1, CTRL2 Pin Bias Current

100

LED Driver

LED Current Sense Voltage (VCAP – VLED)VCAP1 = 24V, ISW = 200mA

●

190

200

210

CAP1, LED1 Pin Bias Current

VCAP1 = 16V, VLED1 = 16V

µA

VCAP1, VLED1 Common Mode Minimum Voltage

2.5

Switching Frequency

●

1.8

2.3

2.8

MHz

Maximum Duty Cycle

Switch Current Limit

●

300

425

Switch VCESAT

ISW = 200mA

250

TOP VIEW

DDB PACKAGE

12-LEAD (3mm

× 2mm) PLASTIC DFN

LED1

CTRL1

GND1

GND2

CTRL2

FB2

CAP1

SW1

VIN

SW2

CAP2

VOUT2

TJMAX = 125°C, θJA = 160°C/W

EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB

ORDER PART NUMBER

DDB PART MARKING

LT3498EDDB

LCQF

Order Options Tape and Reel: Add #TR

Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF

Lead Free Part Marking: http://www.linear.com/leadfree/

Consult LTC Marketing for parts speciﬁed with wider operating temperature ranges.

The ● denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C, VIN = 3V, VCTRL1 = VCTRL2 = 3V.

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