5

FN6434.2

December 22, 2008

Eff_peak

Peak Efficiency

each, L = 8.2µH with DCR

106m

Ω, T

91

%

VIN = 12V, 54 LEDs, 20mA

each, L = 8.2µH with DCR

106m

Ω, T

88

%

VIN = 6V, 54 LEDs, 20mA

each, L = 8.2µH with DCR

106m

Ω, T

86

%

ΔI

Line Regulation

0.1

%

Boost Maximum Duty Cycle

82

%

Boost Minimum Duty Cycle

7%

Lx Frequency

1.0

1.2

1.3

MHz

Lx Frequency

550

600

650

kHz

ILX_leakage

Lx Leakage Current

VLX = 36V, EN = 0

10

µA

REFERENCE

Channel-to-Channel Current Matching

-3.5

±1

+3.5

%

Current Accuracy

±3

%

FAULT DETECTION

Short Circuit Threshold Accuracy

Reg0x08 = 0x0F or 0x0B

Reg0x00 = 0xFF

7.8

8

8.8

V

Reg0x08 = 0x0E or 0x0A

Reg0x00 = 0xFF

2.8

3.1

3.8

V

Over-Temperature Threshold Accuracy

5

°C

Overvoltage Limit on OVP Pin

1.17

1.2

1.23

V

OVP Hysteresis

20

mV

OVP Short Detection Fault Level

300

mV

SMBus INTERFACE

VIL

Guaranteed Range for Data, Clock Input Low Voltage

0.8

V

VIH

Guaranteed Range for Data, Clock Input High Voltage

2.1

VDD

V

VOL

SMBus Data Line Logic Low Voltage with 1.1k

Ω series

resistor from data bus to SMBDAT pin

0.4

V

SMBus Data Line Logic Low Voltage without series resistor

from data bus to SMBDAT pin

0.17

V

Input Leakage On SMBData/SMBClk

-1

1

µA

Nominal Bus Voltage

3V to 5V ±10%

2.7

5.5

V

SMBus TIMING SPECIFICATIONS (Note 4)

SMBus Clock Frequency

10

100

kHz

Bus Free Time Between Stop and Start Condition

4.7

µs

Hold Time After (Repeated) START Condition. After this

Period, the First Clock is Generated

4.0

µs

Repeated Start Condition Setup Time

4.7

µs

Stop Condition Setup Time

4.0

µs

Electrical Specifications

unless otherwise noted. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise

specified. Temperature limits established by characterization and are not production tested. (Continued)

PARAMETER

DESCRIPTION

CONDITION

MIN

TYP

MAX

UNIT

ISL97635