LT3476EUHF(RevA) Просмотр технического описания (PDF) - Linear Technology

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LT3476EUHF
(Rev.:RevA)

High Current Quad Output LED Driver

Linear Technology 

LT3476

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

temperature range, (Note 3) otherwise specifications are at TA = 25°C. SW1-4 = 5V, VIN = 3.3V, SHDN = 3.3V, RT = 21k to GND,

PWM1-4 = 3.3V, VADJ1-4 = REF, CAP1-4 = 5V, unless otherwise noted.

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Quiescent Current Idle

PWM1-4 = 0V

5.5

mA

Quiescent Current Active (Not Switching)

VC1-4 = 0V

22

30

mA

Switching Frequency

Nominal RT Pin Voltage

Maximum Duty Cycle

VADJ1-4 Input Bias Current

VC1-4 Idle Input Bias Current

RT = 8.25k

RT = 21k

RT = 140k

RT = 8.25k (2MHz)

RT = 21k (1MHz)

RT = 140k (200kHz)

Current Out of Pin

PWM1-4 = 0V

1700 2000 2300

kHz

850 1000 1150

kHz

160

200

240

kHz

1.26

V

76

%

84

90

%

98

%

–10

20

100

nA

–20

0

20

nA

EAMP GM (ΔIVC/ΔVCAP-LED)

VC Output Impedance

200

μS

3

MΩ

SW1-4 Current Limit

Static Test

1.5

2

2.5

A

SW1-4 VCESAT

SW1-4 Leakage Current

ISW = 1.3A to GND

SHDN = 0V

350

mV

0.1

5

μA

CAP1-4 Overvoltage Protect Threshold

33.5

35

V

CAP1-4/LED1-4 Idle Input Bias Current

PWM1-4 < 0.4V, CAP = LED = 5V

100

nA

CAP1-4/LED1-4 Input Bias Current

SHDN Input Low Voltage

SHDN Input High Voltage

SHDN Pin Current

CAP = LED = 5V

70

μA

0.4

V

1.5

V

16

30

μA

PWM1-4 Input Low Voltage

0.4

V

PWM1-4 Input High Voltage

1.5

V

PWM1-4 Pin Current

50

100

μA

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Note 3: The LT3476E is guaranteed to meet specifications from 0°C to

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

are assured by design, characterization and correlation with statistical

process controls.

3476fa

3

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