 2013-2023 Microchip Technology Inc. and its subsidiaries

DS20005208B-page 5

MCP1643

2.0

TYPICAL PERFORMANCE CURVES

Note: Unless otherwise indicated, VIN = EN = 1.2V, COUT =20µF, CIN =10µF, L = 4.7µH, ILED =25mA, TA = +25°C,

MSOP-8 package.

FIGURE 2-1:

One White LED ILED vs. VIN.

FIGURE 2-2:

One Red LED ILED vs. VIN.

FIGURE 2-3:

Two Series Connection Red

LEDs ILED vs. VIN.

FIGURE 2-4:

One White LED Efficiency

vs. ILED.

FIGURE 2-5:

One Red LED Efficiency vs.

ILED.

FIGURE 2-6:

Two Red LEDs Efficiency (in

Series Connection) vs. ILED.

Note:

The graphs and tables provided following this note are a statistical summary based on a limited number of

samples and are provided for informational purposes only. The performance characteristics listed herein

are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified

operating range (e.g., outside specified power supply range) and, therefore, outside the warranted range.

0

50

100

150

200

250

300

350

400

450

500

0.6

0.9

1.2

1.5

1.8

2.1

2.4

Input Voltage (V)

R

SET = 5

R

SET = 1.2

R

SET = 0.82

R

SET = 0.41

R

SET = 0.25

LED V

F = 3.5V @ IF = 700 mA

0

25

50

75

100

125

150

175

200

225

250

0.6

0.7

0.8

0.9

1

1.1

1.2

1.3

1.4

1.5

Input Voltage (V)

R

SET = 5

LED V

F = 2.5V @ IF = 350 mA

R

SET = 1.2

R

SET = 0.82

0

50

100

150

200

250

300

350

0.6

0.9

1.2

1.5

1.8

2.1

2.4

Input Voltage (V)

R

SET = 5

R

SET = 1.2

R

SET = 0.82

R

SET = 0.41

LED V

F = 2.5V @ IF = 350 mA

60

65

70

75

80

85

90

95

100

10

100

1000

I

LED (mA)

V

IN = 1.2V

V

IN = 1.8V

V

IN = 2.4V

70

75

80

85

90

95

100

10

100

1000

I

LED (mA)

V

IN = 1.2V

V

IN = 1.8V

V

IN = 2.4V

50

55

60

65

70

75

80

85

90

95

100

10

100

1000

I

LED (mA)

V

IN = 3.0V

V

IN = 2.4V

V

IN = 3.6V