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LT3965/LT3965-1

39651fa

For more information www.linear.com/LT3965

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 40V, VDD = EN/UVLO = 5V, LEDREF = 3V, SRC = 0V, ADDR[4:1] not

connected, unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VDD Input Supply Voltage

2.7

5.5

VDD Operating IQ

SCL = SDA =5V (I2C Bus Idle), RTCLK = 28k

1.3

1.8

VDD Shutdown IQ

EN/UVLO < 0.4V

EN/UVLO = 1.15V

0.1

µA

VIN Operating Voltage

All Channels VOTH[1:0] = VSTH[1:0] = “00” (Note 3)

VIN Operating IQ (Channel Not Switching)

All Channels VOTH[1:0] = VSTH[1:0] = “00”, LED ON

1.4

All Channels VOTH[1:0] = VSTH[1:0] = “11”, LED OFF

2.5

3.3

All Channels VOTH[1:0] = “11”, VSTH[1:0] = “00”,

LED ON

1.5

VIN Shutdown IQ

EN/UVLO < 1.15V

0.1

µA

DRN[8:1] Operating Voltage

VIN – 3V

SRC[8:1] Operating Voltage

VIN – 7.1V

Current Out of SRC[8:1] Pins (Each Channel)

Channel LED Is On (Channel Switch Is Off)

Channel LED Is Off (Channel Switch Is On)

µA

Switch On-Resistance

330

mΩ

Switch Leakage Current

DRN = 16V, VOTH[1:0] = 11

µA

Switch Transition Time (tr/tf)

DRN to 10V through 50Ω Resistor

0.35

0.5

0.65

µs

DRN[8:1] to SRC[8:1] Crowbar Protection

Clamp Voltage

LED or Switch Bypass Current is 500mA

Response Time from SW Crowbar Protection

to SW Secure Protection

LED or Switch Bypass Current is 500mA

1.6

µs

Programmable Open LED Threshold (VOTH)

VOTH[1:0] = “00” (Note 3)

VOTH[1:0] = “01” (LT3965-1 POR State)

VOTH[1:0] = “10”

VOTH[1:0] = “11” (LT3965 POR State)

4.25

8.5

12.75

4.5

13.5

4.75

9.5

14.25

Programmable Shorted LED Threshold (VSTH)

for LEDREF = 0V

VSTH[1:0] = “00” (Note 3)

VSTH[1:0] = “01”

VSTH[1:0] = “10”

VSTH[1:0] = “11”

0.85

1.15

1.2

1.25

1.3

Programmable Shorted LED Threshold (VSTH)

for LEDREF = 3V

VSTH[1:0] = “00” (Note 3)

VSTH[1:0] = “01”

VSTH[1:0] = “10”

VSTH[1:0] = “11”

0.85

3.8

6.7

9.6

1.15

4.2

7.3

10.4

Programmable Shorted LED Threshold (VSTH)

for LEDREF ≥ 4V

VSTH[1:0] = “00” (Note 3)

VSTH[1:0] = “01”

VSTH[1:0] = “10”

VSTH[1:0] = “11”

0.85

4.7

8.5

12.3

1.15

5.3

9.5

13.7

EN/UVLO Threshold Voltage Falling

1.15

1.24

1.35

EN/UVLO Threshold Voltage Rising Hyst.

EN/UVLO Input Bias Current Low

EN/UVLO = 1.15V

2.2

2.7

3.2

µA

EN/UVLO Input Bias Current High

EN/UVLO = 1.33V

100

RTCLK Programmable Internal Oscillator or External Clock Source

LED PWM Dimming Frequency

(=RTCLK Programmed Oscillator

Frequency/2048 or External Clock

Frequency/2048)

RTCLK = 80.6kΩ

RTCLK = 28kΩ

RTCLK = 10kΩ

170

450

950

195

500

1090

220

550

1250

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