LP8543

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SNVS604D – AUGUST 2009 – REVISED MARCH 2013

LED Driver Electrical Characteristics (continued)

Symbol

Parameter

Condition

Min

Typ

Max

Units

PWM_FREQ[2:0] = 000b

-4%

4%

Min LED Switching Frequency

PSPWM_FREQ[1:0] = 00b,

229

-7%

7%

PWM_MODE = 0

Hz

PWM_FREQ[2:0] = 111b,

-4%

4%

Max LED Switching Frequency

PSPWM_FREQ[1:0] = 11b,

19531

-7%

7%

PWM_MODE = 0

270

Output current set to 20 mA

200

330

mV

400

Output current set to 60 mA

300

540

(2)

Saturation voltage is defined as the voltage when the LED current has dropped 10% from the value measured at 2V.

Ambient Light Sensor Interface Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Units

ALS Frequency Range

0.2

2000

kHz

ALS Duty Cycle

40

60

%

Conversion Time

500

ms

PWM Interface Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Units

PWM Frequency Range

0.1

25

kHz

PWM input low time for turn off, stand-alone

50

Turn Off Delay

ms

mode, slope disabled

PWM Input Pulse Width

200

ns

10

PWM input resolution

bit

8

Under-Voltage Protection

Symbol

Parameter

Condition

Min

Typ

Max

Units

UVLO_THR = 1, falling

2.55

2.70

2.94

UVLO_THR = 1, rising

2.62

2.76

3.00

UVLO Threshold Voltage

V

UVLO_THR = 0, falling

5.11

5.40

5.68

UVLO_THR = 0, rising

5.38

5.70

5.98

Logic Interface Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Units

Logic Input PWM

Input Low Level

0.4

V

Input High Level

2.2

V

Input Current

-1.0

1.0

µA

Logic Input EN

Input Low Level

0.4

V

Input High Level

1.2

V

Input Current

-1.0

1.0

µA

Logic Input SCLK, SDA, ADR, ALSI, IF_SEL

Input Low Level

V

Input High Level

V

Input Current

-1.0

1.0

µA

Logic Outputs SDA, FAULT

Output Low Level

0.3

0.5

V

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