© 2010 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN5702 • Rev. 1.0.3

6

Electrical Specifications

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Units

Power Supplies and Thermal Protection

Quiescent Supply Current

1.5x Mode, No LEDs

4.4

mA

1x Mode, No LEDs

0.3

mA

Shutdown Supply Current

0.1

2.0

μA

Under-Voltage Lockout

Threshold

2.55

2.70

V

2.20

2.40

V

Under-Voltage Lockout

Hysteresis

150

mV

Thermal Shutdown

150

°C

Thermal Shutdown Hysteresis

20

°C

LED Current Sinks

Absolute Current Accuracy

–10%

+10%

mA

Maximum Diode Current

(3)

30

mA

(4)

0.4

3.0

%

1x to 1.5x Gain Transition

Threshold

LED Cathode Voltage Falling

100

mV

Current Sink Headroom

(5)

65

mV

PWM Dimming

PWM Switching Frequency

20

kHz

PWM Duty-Cycle

0.15

100.00

%

Charge Pump

Output Resistance

1.5x Mode

2.4

Ω

1x Mode

0.9

Ω

Switching Frequency

0.9

1.2

1.5

MHz

Startup Time

250

μs

Logic Inputs (EN, SDA, SCL)

HIGH-Level Input Voltage

1.2

V

LOW-Level Input Voltage

0.4

V

Maximum Input Voltage

1.8

5.5

V

Input Bias Current

0.01

1.00

μA

Notes:

3.

The maximum total output current for the IC should be limited to 180mA. The total output current can be split between the

two groups (IDxA = IDxB = 30mA maximum). Under maximum output current conditions, special attention must be given

to input voltage and LED forward voltage to ensure proper current regulation. See the Maximum Output Current section of

the datasheet for more information.

4.

For the two groups of current sinks on a part (group A and group B), the following are determined: the maximum sink

current in the group (MAX), the minimum sink current in the group (MIN), and the average sink current of the group (AVG).

For each group, two matching numbers are calculated: (MAX-AVG)/AVG and (AVG-MIN)/AVG. The largest number of the

two (worst case) is considered the matching value for the group. The matching value for a given part is considered to be

the highest matching value of the two groups. The typical specification provided is the most likely norm of the matching

value for all parts.

5.