LP8545

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SNVS635D – APRIL 2010 – REVISED DECEMBER 2013

LED DRIVER ELECTRICAL CHARACTERISTICS

Symbol

Parameter

Condition

Min

Typ

Max

Units

Leakage Current

0.1

1

µA

EN_I_RES = 0, CURRENT[7:0] = FFh

30

Maximum Source Current

mA

OUT1...OUT6

EN_I_RES = 1

50

Output Current Accuracy

-3

+3

Output current set to 23 mA, EN_I_RES = 1

%

(1)

-4

+4

Output current set to 23 mA, EN_I_RES = 1

0.5

%

10

9

8

PWM Output Resolution

bits

(2)

13

12

11

PWM_FREQ[4:0] = 00000b

600

PLL clock 5 MHz

Hz

PWM_FREQ[4:0] = 11111b

19.2k

PLL clock 5 MHz

Output current set to 20 mA

55

120

175

mV

Output current set to 30 mA

80

180

270

(1)

Output Current Accuracy is the difference between the actual value of the output current and programmed value of this current.

Matching is the maximum difference from the average. For the constant current sinks on the part (OUT1 to OUT6), the following are

determined: the maximum output current (MAX), the minimum output current (MIN), and the average output current of all outputs (AVG).

Two matching numbers are calculated: (MAX-AVG)/AVG and (AVG-MIN/AVG). The largest number of the two (worst case) is

considered the matching figure. The typical specification provided is the most likely norm of the matching figure for all parts. Note that

some manufacturers have different definitions in use.

(2)

PWM output resolution and frequency depend on the PLL settings. Please see section “PWM Frequency Setting” for full description

(3)

Saturation voltage is defined as the voltage when the LED current has dropped 10% from the value measured at 1V.

PWM INTERFACE CHARACTERISTICS

Symbol

Parameter

Condition

Min

Typ

Max

Units

PWM Frequency Range

0.1

25

kHz

Minimum Pulse ON time

1

µs

Minimum Pulse OFF time

1

Turn on delay from standby to

PWM input active, EN pin rise from low to

6

ms

backlight on

high

PWM input low time for turn off, slope

Turn Off Delay

50

ms

disabled

10

11

PWM Input Resolution

bits

12

13

UNDER-VOLTAGE PROTECTION

Symbol

Parameter

Condition

Min

Typ

Max

Units

UVLO[1:0] = 00

Disabled

UVLO[1:0] = 01, falling

2.55

2.70

2.94

UVLO[1:0] = 01, rising

2.62

2.76

3.00

UVLO[1:0] = 10, falling

5.11

5.40

5.68

V

UVLO[1:0] = 10, rising

5.38

5.70

5.98

UVLO[1:0] = 11, falling

7.75

8.10

8.45

UVLO[1:0] = 11, rising

8.36

8.73

9.20

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