ADP1655 Analog Devices, ADP1655 Datasheet - Page 9

• Manufacturer Part Number: ADP1655
• Description: Dual LED Flash Driver with I2C Compatible Interface
• Manufacturer: Analog Devices

Specifications of ADP1655

• Product Description: Serial 2 WLED Flash Driver
• Led #: 2
• Led Configuration: Serial
• Topology: Inductive
• Application: Flash
• I2c Support: Yes
• Max Iout (ma): 400mA
• Brightness Control: I2C
• Peak Efficiency (%): n/a
• Switching Frequency: 2MHz
• Over Volt Protection (v): 10V
• Vin Min (v): 2.5V
• Vout (v): Current Output
• Synchronous: Yes
• Package: 12-Bump WLCSP

Figu
Figure 12. Inductor Current, Two LEDs Torch Mode, I
re 11. Inductor Current, Two LEDs Flash Mode, I
1
3
2
4
1
2
3
4
–10
10
–2
–4
–6
–8
CHANNEL 1 (I
CHANNEL 2 (I
CHANNEL 1 (I
CHANNEL 2 (I
L = FDSE0312-2R2M
C
L = FDSE0312-2R2M
C
8
6
4
2
0
OUT
OUT
0
Figure 13. LED Current Accuracy vs. Output Current
= 10µF
= 10µF
V
V
V
IN
IN
IN
= 3.2V
= 3.6V
= 4.2V
100
HPLED
L
L
HPLED
) 0.2A/DIV
) 0.2A/DIV
) 0.1A/DIV
) 0.02A/DIV
OUTPUT CURRENT (mA)
200
500ns/DIV
500ns/DIV
CHANNEL 3 (LED_OUT) 5V/DIV
CHANNEL 4 (SW) 5V/DIV
CHANNEL 3 (LED_OUT) 5V/DIV
CHANNEL 4 (SW) 5V/DIV
300
LED
LED
4
= 400 mA, V
= 40 mA, V
00
500
IN
IN
= 3.6 V
= 3
.6 V
Rev. 0 | Page 9 of 24
Figure
1
2
3
4
100
100
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
CHANNEL 1 (IBAT) 1A/DIV
CHANNEL 2 (I
L = FDSE0312-2R2M
C
0
0
10
OUT
Figure 16. Tx Masking Response, TX_MASK = 0 V to 1.8 V,
10
Figure 15. Efficiency P
14. Efficiency P
= 10µF
V
V
V
V
V
V
IN
IN
IN
IN
IN
IN
= 3.2V
= 3.6V
= 4.2V
= 3.2V
= 3.6V
= 4.2V
HPLED
I
LED
= 40 mA to 400 mA, V
) 0.2A/DIV
LED
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
/P
IN
LED
20µs/DIV
, Two High Power White LEDs in
/P
Δ: 4µs
IN
100
100
, One High Power White LED
CHANNEL 3 (V
CHANNEL 4 (TX_MASK) 5V/DIV
IN
= 3.2 V
OUT
) 5V/DIV
ADP1655
Series
1000
1k