LP8501 datasheet(11/51 Pages) TI1

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VDD

VOUT

TIME (10 ms/DIV)

2.7

3.1

3.5

3.8

4.2

4.6

VDD

VOUT

3.6V

4.2V

2.8V

3.6V

TIME (2 ms/DIV)

VLED = 3.6V

VLED = 3.3V

VLED = 3V

IOUT = 45 mA

(9*5 mA)

VDD

2.7

3.4

3.0

3.3

3.6

3.9

4.2

3.6

3.8

4.1

4.3

4.5

VDD decreasing

VDD increasing

VDD

2.7

2.8

3.0

3.3

3.6

3.9

4.2

3.1

3.5

3.8

4.2

4.5

100 mV

200 mV

300 mV

400 mV

VDD

2.7

2.9

3.0

3.3

3.6

3.9

4.2

3.2

3.5

3.9

4.2

4.5

Startup to 1x mode

Startup to 1.5x mode

TIME (200 2s/DIV)

0.9

1.8

2.8

3.7

4.6

0.0

LP8501

www.ti.com

SNVS548D – SEPTEMBER 2008 – REVISED AUGUST 2013

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

Charge Pump Automatic Gain Change with Different

Charge Pump Startup in 1x and 1.5x Modes

Hysteresis

Figure 9.

Figure 10.

Charge Pump Automatic Gain Change with Different LED

Charge Pump Automatic Gain Change Hysteresis with 400

Forward Voltages

mV Setting

Figure 11.

Figure 12.

Line Transient and Charge Pump Automatic Gain Change

(1.5x to 1x)

(1x to 1.5x)

with 9 LED Outputs at 1mA 100% PWM

Figure 13.

Figure 14.

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