ADP8866 Analog Devices, ADP8866 Datasheet - Page 10

• Manufacturer Part Number: ADP8866
• Description: Charge Pump Driven 9-Channel LED Driver with Automated LED Lighting Effects
• Manufacturer: Analog Devices

Specifications of ADP8866

• Vin Range: 2.5 to 5.5V
• Vout (v): 4.3 to 5.5
• Synchronous: No
• Package: 20-Lead LFCSP
• Led Configuration: Parallel
• Topology: Capacitive
• I2c Support: Yes
• Max Iout (ma): 25mA
• Brightness Control: I2C
• Peak Efficiency (%): 92%
• Switching Frequency: 1MHz

ADP8866
100
1
2
3
1
2
3
90
80
70
60
50
40
30
20
10
0
2.5
C
V
I
Figure 22. Typical Efficiency (Each LED Set to 25 mA)
C
V
I
OUT
OUT
Figure 24. Typical Operating Waveforms, G = 1.5×
IN
IN
IN
IN
Figure 23. Typical Operating Waveforms, G = 1×
= 1µF, C
= 3.6V
= 3.0V
= 1µF, C
= 120mA
= 120mA
3.0
OUT
OUT
V
V
V
I
V
I
IN
OUT
IN
IN
OUT
= 1µF, C1 = 1µF, C2 = 1µF
IN
= 1µF, C1 = 1µF, C2 = 1µF
(AC-COUPLED) 10mA/DIV
(AC-COUPLED) 10mA/DIV
(AC-COUPLED) 50mV/DIV
(AC-COUPLED) 50mV/DIV
3.5
(AC-COUPLED) 50mV/DIV
(AC-COUPLED) 50mV/DIV
1µs/DIV
1µs/DIV
V
T
T
IN
4.0
(V)
4.5
V
V
5.0
F
F
= 3.4V
= 4.0V
5.5
Rev. 0 | Page 10 of 52
1
2
3
2
3
4
C
V
C
V
I
OUT
IN
IN
IN
IN
Figure 25. Typical Operating Waveforms, G = 2×
= 10µF, C
= 3.6V
= 2.5V
= 1µF, C
= 120mA
Figure 26. Typical Startup Waveforms
OUT
I
OUT
IN
V
V
I
IN
(10mA/DIV)
IN
OUT
= 1µF, C1 = 1µF, C2 = 1µF
= 1µF, C1 = 1µF, C2 = 1µF
(AC-COUPLED) 10mA/DIV
(AC-COUPLED) 50mV/DIV
(AC-COUPLED) 50mV/DIV
100µs/DIV
1µs/DIV
T
T
I
OUT
V
OUT
(10mA/DIV)
(1V/DIV)