LTC3548-2 datasheet(2/16 Pages) LINER

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LTC3548-2

35482fa

VIN Voltages.................................................– 0.3V to 6V

VOUT1, VFB2 Voltages ...................... – 0.3V to VIN + 0.3V

RUN1, RUN2 Voltages ................................ – 0.3V to VIN

MODE/SYNC Voltage ...................... – 0.3V to VIN + 0.3V

SW1, SW2 Voltage ......................... – 0.3V to VIN + 0.3V

POR Voltage ................................................– 0.3V to 6V

Ambient Operating Temperature Range

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

°C to 85°C

Junction Temperature (Note 5) ............................. 125

°C

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

°C to 125°C

ABSOLUTE

AXI U

RATI GS

(Note 1)

ORDER PART NUMBER

DD PART MARKING

TJMAX = 125°C, θJA = 40°C/W, θJC = 3°C/W (4-LAYER BOARD)

EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB GND

LCDK

LTC3548EDD-2

PACKAGE/ORDER I FOR ATIO

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

TOP VIEW

DD PACKAGE

10-LEAD (3mm

× 3mm) PLASTIC DFN

VFB2

RUN2

POR

SW2

MODE/

SYNC

VOUT1

RUN1

VIN

SW1

GND

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

temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, unless otherwise specified. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN

Operating Voltage Range

●

2.5

5.5

IFB2

Feedback Pin Input Current

●

VFB2

Feedback Voltage of Channel 2 (Note 3)

°C ≤ TA ≤ 85°C

0.588

0.6

0.612

–40

°C ≤ TA ≤ 85°C

●

0.585

0.6

0.612

VOUT1

Output Voltage of Channel 1 (Note 3)

°C ≤ TA ≤ 85°C

1.764

1.8

1.836

–40

°C ≤ TA ≤ 85°C

●

1.755

1.8

1.836

∆VLINE REG

Reference Voltage Line Regulation

VIN = 2.5V to 5.5V (Note 3)

0.3

0.5

%/V

∆VLOAD REG

Output Voltage Load Regulation

(Note 3)

0.5

Input DC Supply Current (Note 4)

Active Mode

VOUT1 = 1.5V, VFB2 = 0.5V

700

950

µA

Sleep Mode

VOUT1 = 1.9V, VFB2 = 0.63V, MODE/SYNC = 3.6V

µA

Shutdown

RUN = 0V, VIN = 5.5V, MODE/SYNC = 0V

0.1

µA

fOSC

Oscillator Frequency

VOUT1 = 1.8V, VFB2 = 0.6V

●

1.8

2.25

2.7

MHz

fSYNC

Synchronization Frequency

2.25

MHz

ILIM

Peak Switch Current Limit Channel 1

VIN = 3V, Duty Cycle <35%

0.95

1.2

1.6

Peak Switch Current Limit Channel 2

VIN = 3V, VFB2 = 0.5V, Duty Cycle <35%

0.6

0.7

0.9

RDS(ON)

Top Switch On-Resistance

(Note 6)

0.35

0.45

Ω

Bottom Switch On-Resistance

(Note 6)

0.30

0.45

Ω

ISW(LKG)

Switch Leakage Current

VIN = 5V, VRUN = 0V, VFB2 = 0V, VOUT1 = 0V

0.01

µA

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/

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