LM3464, LM3464A

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SNVS652F – APRIL 2010 – REVISED MAY 2013

Electrical Characteristics (LM3464/LM3464A) (continued)

Specification with standard type are for TA = TJ = +25°C only; limits in boldface type apply over the full Operating Junction

Temperature (TJ) range. Minimum and Maximum are specified through test, design or statistical correlation. Typical values

represent the most likely parametric norm at TJ = +25°C, and are provided for reference purposes only. Unless otherwise

stated the following conditions apply: VIN = 48V.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

IEN-MAX

EN pin internal pull current

VEN = 0V

7.2

11

14.7

uA

Analog Dimming Control Interface

VCTHM-MAX

Sawtooth max. voltage threshold at

2.95

3.25

3.3

V

Thermal_Cap pin

100% output duty cycle

VCTHM-MIN

Sawtooth min. voltage threshold at

0.325

0.4

0.493

V

Thermal_Cap pin

0% output duty cycle

ICTHM

Thermal_Cap pin output current

38.9

50

61

uA

PWM Dimming Control Interface

VDIM-LED-ON

DIM pin voltage threshold at LED ON

VDMIN = 0V

1.19

V

VTHERMAL = VCC

VDIM-LED-OFF

DIM pin voltage threshold at LED OFF

VDMIN = 0V

1.3

V

VTHERMAL = VCC

Dynamic Headroom Control Output

VOutP-MAX

OutP pin max. output voltage

VCC-0.5

V

VOutP-MIN

OutP pin min. output voltage

IoutP = 1 mA current sink

0.3

V

VLEDFB-LED-ON

VLedFB pin voltage threshold at LED ON

2.4

2.5

2.58

V

VLEDFB-SYS-RST

System restart VLedFB pin voltage threshold for

Measure at VLedFB pin

1.2

V

system restart

LED Current Regulator

VGDx-MAX

GDx gate driver max. output voltage

4.73

VCC–1

V

VGDx-MIN

GDx gate driver min. output voltage

0.115

0.127

V

IGDx-MAX

GDx gate driver short circuit current

GDx short to GND

8

mA

IDRx

DRx pin input current

VDRx = 10V

25

29

μA

VDRx = 100V

55

70

μA

Fault Detection and Handling

VOVP-TH

DRx Pin over-voltage protection threshold

Measure at DRx pin

18

19

21

V

VSHORTFAULT

DRx short fault threshold

Any VDRx < 2.5V

8.35

8.4

9.75

V

VOPENFAULT

SEx open fault threshold

Measure at SEx pin

30

mV

IFAULT-CAP

FAULT_CAP pin output current

All VDRx < VOVP-TH

25

uA

IFAULT-CAP-OVP

FAULT_CAP pin output current at DRx over-

Any VDRx ≥ VOVP-TH

105

uA

voltage

VFAULT-CAP

FAULT-CAP pin voltage threshold at fault timer

VFAULT-CAP rising

3.6

V

expire

RFaultb

Faultb pin to GND resistance

LED fault = TRUE

110

Ω

Thermal Protection

TOTM-TH

Over Temperature Monitor Threshold

125

°C

TOTM-HYS

Over Temperature Monitor Hysteresis

20

°C

TSD

Thermal shutdown temperature

TJ rising

165

°C

TSD-HYS

Thermal shutdown temperature hysteresis

TJ falling

20

°C

Thermal Resistance

θJA

Junction to Ambient (2)

TSSOP-28 Package

33.5

°C/W

θJC

Junction to Case (2)

6

°C/W

(2)

Measurements are performed on a 4 layer JEDEC board with 10 vias provided under the exposed pad. See JESD51-1 to JESD51-11.

The value of

θJA is specifically dependent on the PCB trace area, trace material and the number of layers and thermal vias.

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