LT3463_15 datasheet(2/8 Pages) LINER

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LT3463/LT3463A

3463f

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

VIN, SHDN1, SHDN2 Voltage ................................... 15V

SW1, SW2, VOUT1 Voltage ....................................... 42V

D2 Voltage ............................................................. –42V

FB1, FB2 Voltage Range .............................. –0.3V to 2V

Junction Temperature ........................................... 125

°C

Operating Ambient Temperature Range

(Note 2) .............................................. – 40

°C to 85°C

Storage Temperature Range ................. – 65

°C to 125°C

ORDER PART

NUMBER

LT3463EDD

LT3463AEDD

DD PART MARKING

ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 2.5V, VSHDN = 2.5V unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Input Voltage

2.2

2.4

Total Quiescent Current

For Both Switchers, Not Switching

µA

Shutdown Current

VSHDN1 = VSHDN2 = 0V

0.1

µA

VREF Pin Voltage

With 124k

Ω to GND

1.23

1.25

1.27

VREF Pin Voltage Line Regulation

With 124k

Ω to GND

0.05

0.10

%/V

FB1 Comparator Trip Voltage

High to Low Transition

1.225

1.25

1.275

FB1 Comparator Hysteresis

8mV

FB1 Line Regulation

2.5V < VIN < 15V

0.05

0.10

%/V

FB1 Pin Bias Current (Note 3)

VFB1 = 1.3V

FB2 Comparator Trip Voltage

Low to High Transition

FB2 Comparator Hysteresis

8mV

FB2 Line Regulation (VREF – VFB2)

2.5V < VIN < 15V

0.05

0.10

%/V

FB2 Pin Bias Current (Note 4)

VFB2 = –0.1V

SW1 Switch Off Time

VOUT1 – VIN = 4V

300

VOUT1 – VIN = 0V

1.5

µs

SW2 Switch Off Time

VFB2 < 0.1V

300

VFB2 = 1V

1.5

µs

Switch VCESAT (SW1, SW2)

ISW = 150mA

180

Switch Current Limit (SW1)

180

250

320

Switch Current Limit (SW2)

LT3463

180

250

320

LT3463A

320

400

460

Swith Leakage Current (SW1, SW2)

Switch Off, VSW = 42V

0.01

µA

Schottky Forward Voltage (VOUT1, D2)

ID = 150mA

750

Schottky Reverse Leakage Current

VOUT1 – VSW = 42V

µA

VD2 = –42V

µA

SHDN1 Pin Current

VSHDN1 = 2.5V

µA

SHDN2 Pin Current

VSHDN2 = 2.5V

µA

SHDN1/SHDN2 Start-Up Threshold

0.3

1.5

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: The LT3463/LT3463A are guaranteed to meet performance

specifications from 0

°C to 70°C. Specifications over the –40°C to 85°C

TJMAX = 125°C, θJA = 43°C/W, θJC = 3°C/W

EXPOSED PAD (PIN 11) IS GND

AND MUST BE SOLDERED TO PCB

LAFC

LBJK

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

TOP VIEW

DD PACKAGE

10-LEAD (3mm

× 3mm) PLASTIC DFN

FB1

SHDN1

SHDN2

VREF

FB2

VOUT1

SW1

VIN

SW2

operating ambient temperature range are assured by design,

characterization and correlation with statistical process controls.

Note 3: Bias current flows into the FB1 pin.

Note 4: Bias current flows out of the FB2 pin.

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