ADM8845ACPZ-REEL7 Analog Devices Inc, ADM8845ACPZ-REEL7 Datasheet - Page 7

• Manufacturer Part Number: ADM8845ACPZ-REEL7
• Description: IC, WHITE LED DRIVER CHARGE PUMP LFCSP16
• Manufacturer: Analog Devices Inc
• Type: Backlight, White LEDr

Specifications of ADM8845ACPZ-REEL7

• Led Driver Application: Cellular Phones, White LED Backlighting
• No. Of Outputs: 1
• Output Current: 30mA
• Output Voltage: 4.81V
• Input Voltage: 2.6V To 5.5V
• Topology: Charge Pump
• Constant Current: Yes
• Number Of Outputs: 6
• Internal Driver: Yes
• Type - Primary: Backlight, Flash/Torch
• Type - Secondary: White LED
• Frequency: 200kHz
• Voltage - Supply: 2.6 V ~ 5.5 V
• Voltage - Output: 4.81V
• Mounting Type: Surface Mount
• Package / Case: 16-LFCSP
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 30mA
• Internal Switch(s): Yes
• Efficiency: 88%
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: ADM8845EB-EVALZ - BOARD EVALUATION FOR ADM8845
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: ADM8845ACPZ-REEL7

V
V
OUT
CC
200
300
250
150
100
20
16
12
50
8
4
0
0
Figure 9. I
2.6
1
0
2
CH1 20.0mV
Figure 11. 1.5× Mode Operating Waveforms
Figure 10. Input Current vs. Supply Voltage,
3.0
LED
Six LEDs Enabled, Frequency = 1 kHz
20
(mA) vs. PWM Dimming (Varying Duty Cycle),
3.4
B
W
CH2
SUPPLY VOLTAGE (V)
Six LEDs Enabled
DUTY CYCLE (%)
40
3.8
15mA/LED
20.0mV
20mA/LED
4.2
B
W
60
M 400ns CH1
4.6
80
5.0
220mV
5.4
100
Rev. C | Page 7 of 20
Figure 13. Soft Start Showing the Initial In-Rush Current and V
CURRENT
V
Figure 12. LED Efficiency vs. Varying Duty Cycle of 1 kHz PWM Signal,
CTRL1/2
V
OUT
CC
V
95
90
85
80
70
65
60
75
OUT
1
2
1
0
2
3
CH1 20.0mV
CH3 1.00V
CH1 2.00V
10
Figure 14 .2× Mode Operating Waveform
20
Six LEDs @ 20 mA/LED, V
B
Six LEDs Enabled, 20 mA/LED
W
B
W
30
CH2
CH2
DUTY CYCLE (%)
40
20.0mV
160mA
50
B
B
W
W
60
M 400ns CH1
CC
M 5.00µs CH2
= 3.6 V
70
80
ADM8845
90
OUT
220mV
180mV
Variation,
100