ADP1655 Analog Devices, ADP1655 Datasheet - Page 8

• 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

ADP1655
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 7. Startup, Two LEDs Flash Mode, I
1
2
3
4
600
500
400
300
200
100
450
400
350
300
250
200
150
100
50
CHANNEL 1 (I
CHANNEL 2 (I
L = FDSE0312-2R2M
C
0
0
Figure 6. Maximum Current vs. Input Voltage, Two LEDs;
2.7
OUT
Figure 5. Maximum Current vs. Input Voltage, One LED
2.7
= 10µF
LED Forward Voltage (Vf) = 4.3 V for each LED
3.2
3.2
L
HPLED
) 0.5A/DIV
) 0.2A/DIV
3.7
3.7
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
50µs/DIV
Δ: 335µs
CHANNEL 3 (V
CHANNEL 4 (STROBE) 5V/DIV
4.2
4.2
LED
= 400 mA, V
4.7
4.7
OUT
I
I
I
I
LIMIT
LIMIT
LIMIT
LIMIT
I
I
I
I
LIMIT
LIMIT
LIMIT
LIMIT
) 5V/DIV
– 2.00A
– 1.75A
– 1.50A
– 1.25A
– 2.00A
– 1.75A
– 1.50A
– 1.25A
5.2
5.2
IN
= 3.2 V
Rev. 0 | Page 8 of 24
Figure 9. Startup, Two LEDs Assist Light Mode, I
Figure 10. Startup, Two LEDs Torch Mode, I
Figure 8. Startup, Two LEDs Flash Mode, I
1
2
3
4
1
2
3
4
1
2
3
4
CHANNEL 1 (I
CHANNEL 2 (I
L = FDSE0312-2R2M
C
CHANNEL 1 (I
CHANNEL 2 (I
CHANNEL 1 (I
CHANNEL 2 (I
L = FDSE0312-2R2M
C
L = FDSE0312-2R2M
C
OUT
OUT
OUT
= 10µF
= 10µF
= 10µF
HPLED
L
HPLED
L
HPLED
) 0.5A/DIV
L
) 0.5A/DIV
) 0.5A/DIV
) 0.2A/DIV
) 0.2A/DIV
) 0.2A/DIV
Δ: 180µs
Δ: 180µs
50µs/DIV
50µs/DIV
50µs/DIV
Δ: 335µs
CHANNEL 3 (V
CHANNEL 4 (STROBE) 5V/DIV
CHANNEL 3 (V
CHANNEL 4 (SCL) 5V/DIV
CHANNEL 3 (V
CHANNEL 4 (SCL) 5V/DIV
LED
LED
= 400 mA, V
LED
= 40 mA, V
= 40 mA, V
OUT
OUT
OUT
) 5V/DIV
) 5V/DIV
) 5V/DIV
IN
IN
= 3.6 V
= 3.6 V
IN
= 3.2 V