LP5523 datasheet(8/56 Pages) TI1

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LP5523

SNVS550D – SEPTEMBER 2009 – REVISED MAY 2013

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Typical Performance Characteristics

Unless otherwise specified: VDD = 3.6V, CIN = COUT = 1.0 µF, C1 = C2 = 0.47 µF, TA = 25°C.

(1)

Charge Pump 1.5x Efficiency

Output Voltage of the Charge Pump (1.5x) as a Function of

Load Current

Load Current at Four Input Voltage Levels

Figure 3.

Figure 4.

Effect of Adaptive Hysteresis on the Widht of the

Gain Change Hysteresis Loop at Factory Settings;

Hysteresis Loop; Load = 6 x Nichia NSCW100 WLEDs on D1

6 x 1,0 mA Load (6 Nichia NSCW100 WLEDs on D1 to D6)

to D6 @ 100% PWM

Figure 5.

Figure 6.

LED Current Matching Distribution

LED Current Accuracy Distribution

@ 17.5mA Current (2)

Figure 7.

Figure 8.

(1)

CIN, COUT, C1, C2: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.

(2)

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 outputs on the part (D1 to D9), 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. Note that some manufacturers have different definitions in use.

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