FAN5640S7X datasheet(4/11 Pages) FAIRCHILD

Il numero della parte	FAN5640S7X

Spiegazioni elettronici	FAN5640 Dual High-Side Constant Current Source for High-Voltage Keypad LED Illumination

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Produttore elettronici	FAIRCHILD [Fairchild Semiconductor]

Homepage	http://www.fairchildsemi.com

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FAN5640 • Rev. 1.0.2

4

Electrical Characteristics

VIN = 6V to 20V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C, VIN = 14V, ILED = 15mA.

Symbol

Parameter

Condition

Min.

Typ.

Max.

Unit

Power Supplies

VIN

Input Voltage Range

6

20

V

IQ

Quiescent Current

Measured at GND pin, VIN = 20V

48

65

µA

Measured at GND pin, VIN = 6V

44

55

ISD

Shutdown Supply Current

VIN = 20V, EN = GND

8

13

µA

VIN = 6V, EN = GND

5

8

VEN

Enable High-Level Input Voltage

1.2

V

Enable Low-Level Input Voltage

0.4

IEN

Enable Input Current

EN = 5V

9

15

µA

EN=GND

0.1

1.0

Regulation

ILIM1

Channel 1 Current Limit

(2)

30

mA

ILIM2

Channel 2 Current Limit

(2)

30

mA

∆IOUT

Output Current Accuracy

2.5mA < IOUT ≤ 5mA

(3)

-15

+15

%

5mA < IOUT ≤ 25mA

(3)

-10

+10

IMATCH

Channel-to-Channel Current Matching

(4)

-3

+3

%

VDO

Output Dropout Voltage

VIN – VOUT at 90% IOUT

Programmed IOUT = 25mA

1.80

2.50

V

VIN – VOUT at 90% IOUT

Programmed IOUT = 2.5mA

0.43

0.60

VREF

Reference Voltage

475

mV

IMIRROR

Current Mirror Ratio

IOUT / IRSET

275

∆IOUT/∆VIN Power Supply Current Dependency VOUT = VIN – 2V

(5)

0.5

2.0

%/V

TON

Turn-On Time

VIN=14V , IOUT=12.5mA

(6)

5

8

µs

TSD

Thermal Shutdown Protection

Rising Temperature

150

°C

Hysteresis

20

Notes:

2.

If only one channel is needed, IOUT1 can be tied to IOUT2 to boost maximum current to 50mA.

3.

REXT resistor tolerance adds to the specification limit of the pin RSET to determine overall current accuracy.

4.

Matching defined as [(IOUT1-IOUT2)/(IOUT1+IOUT2)]×100.

5.

VOUT is the total voltage drop across the LED string.

6.

Measured from EN crossing 1.8V to output current reaching 90% of target IOUT.

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