LT3471EDD datasheet(2/16 Pages) LINER

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LT3471

3471f

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Operating Voltage

2.1

2.4

Reference Voltage

0.991

1.000

1.009

●

0.987

1.013

Reference Voltage Current Limit

(Note 3)

1.4

Reference Voltage Load Regulation

0mA ≤ IREF ≤ 100µA (Note 3)

0.1

0.2

%/100µA

Reference Voltage Line Regulation

2.6V ≤ VIN ≤ 16V

0.03

0.08

%/V

Error Amplifier Offset

Transition from Not Switching to Switching, VFBP = VFBN = 1V

±2

±3mV

FB Pin Bias Current

(Note 3)

●

100

Quiescent Current

VSHDN = 1.8V, Not Switching

2.5

Quiescent Current in Shutdown

VSHDN = 0.3V, VIN = 3V

0.01

µA

Switching Frequency

1.2

1.4

MHz

Maximum Duty Cycle

●

Minimum Duty Cycle

Switch Current Limit

At Minimum Duty Cycle

1.5

2.05

2.6

At Maximum Duty Cycle (Note 4)

0.9

1.45

2.0

Switch VCESAT

ISW = 1.3A (Note 5)

330

440

Switch Leakage Current

VSW = 5V

0.01

µA

SHDN/SS Input Voltage High

1.8

SHDN Input Voltage Low

Quiescent Current ≤ 1µA

0.3

SHDN Pin Bias Current

VSHDN = 3V, VIN = 4V

µA

VSHDN = 0V

0.1

µA

(Note 1)

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

SW1, SW2 Voltage ....................................– 0.4V to 42V

FB1N, FB1P, FB2N, FB2P Voltage ....... 12V or VIN – 1.5V

SHDN/SS1, SHDN/SS2 Voltage .............................. 16V

VREF Voltage ........................................................... 1.5V

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

Operating Temperature Range (Note 2) .. – 40°C to 85°C

Storage Temperature Range ................. – 65°C to 125°C

The

● denotes specifications which apply over the full operating

temperature range, otherwise specifications are TA = 25°C. VIN = VSHDN = 3V unless otherwise noted.

ORDER PART

NUMBER

LT3471EDD

DD PART MARKING

LBHM

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

EXPOSED PAD (PIN 11) IS GND

MUST BE SOLDERED TO PCB

ELECTRICAL CHARACTERISTICS

PACKAGE/ORDER I FOR ATIO

ABSOLUTE

AXI U

RATI GS

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

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

a device may be impaired.

Note 2: The LT3471E is guaranteed to meet performance specifications from

0°C to 70°C. Specifications over the –40°C to 85°C operating temperature

range are assured by design, characterization and correlation with statistical

process controls.

TOP VIEW

DD PACKAGE

10-LEAD (3mm × 3mm) PLASTIC DFN

SW1

SHDN/SS1

VIN

SHDN/SS2

SW2

FB1N

FB1P

VREF

FB2P

FB2N

Note 3: Current flows out of the pin.

Note 4: See Typical Performance Characteristics for guaranteed current

limit vs duty cycle.

Note 5: VCESAT is 100% tested at wafer level.

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