LT1946_15 datasheet(2/12 Pages) LINER

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LT1946

1946fb

PACKAGE/ORDER I FOR ATIO

TJMAX = 125°C, θJA = 40°C/W,

θJC = 10°C/W

ORDER PART

NUMBER

MS8 PART MARKING

TJMAX = 125°C, θJA = 125°C/W

(4-LAYER BOARD)

LTUG

LT1946EMS8

SHDN

GND

COMP

VIN

TOP VIEW

MS8 PACKAGE

8-LEAD PLASTIC MSOP

ORDER PART

NUMBER

MS8 PART MARKING

LTBNW

LT1946EMS8E

TOP VIEW

MS8E PACKAGE

8-LEAD PLASTIC MSOP

EXPOSED PAD (PIN 9) IS GROUND

(MUST BE SOLDERED TO PCB)

SHDN

GND

COMP

VIN

VIN Voltage ............................................................. 16V

SW Voltage ............................................... – 0.4V to 36V

FB Voltage ............................................................. 2.5V

SHDN Voltage ......................................................... 16V

Current Into FB Pin ..............................................

±1mA

(Note 1)

The

● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 3V, VSHDN = VIN unless otherwise specified. (Note 2)

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Operating Voltage

2.45

2.6

Maximum Operating Voltage

Feedback Voltage

1.230

1.250

1.270

●

1.220

1.270

FB Pin Bias Current

VFB = 1.250V (Note 3)

●

120

Error Amp Transconductance

∆I = 2µA40

µmhos

Error Amp Voltage Gain

300

V/V

Quiescent Current

VSHDN = 2.5V, Not Switching

3.2

Quiescent Current in Shutdown

VSHDN = 0V, VIN = 3V

µA

Reference Line Regulation

2.6V

≤ VIN ≤ 16V

0.01

0.05

%/V

Switching Frequency

0.9

1.2

1.4

MHz

●

0.8

1.5

MHz

Switching Frequency in Foldback

VFB = 0V

0.4

MHz

Maximum Duty Cycle

●

Switch Current Limit

(Note 4)

●

1.5

2.1

3.1

Switch VCESAT

ISW = 1A

240

340

Switch Leakage Current

VSW = 5V

0.01

µA

Soft-Start Charging Current

VSS = 0.5V

2.5

µA

ABSOLUTE

AXI U

RATI GS

ELECTRICAL CHARACTERISTICS

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

°C

Operating Temperature Range (Note 2) .. – 40

°C to 85°C

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

°C to 150°C

Lead Temperature (Soldering, 10 sec)................. 300

°C

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

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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