Datasheet AL3644 (Diodes) - 2
| Manufacturer | Diodes |
| Description | Dual 1.5A Current Source Camera Flash LED Driver |
| Pages / Page | 23 / 2 — AL3644. Typical Applications Circuit. C U. R P. W E. Pin Descriptions. … |
| File Format / Size | PDF / 805 Kb |
| Document Language | English |
AL3644. Typical Applications Circuit. C U. R P. W E. Pin Descriptions. Pin Number. Pin Name. Type. Function. www.diodes.com
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AL3644 Typical Applications Circuit
1mH 2.5V to 5V SW IN OUT 10mF 10mF
T AL3644 C U
LED1
D
TORCH/
O
TEMP
R P
Flash STROBE LED
W E
HWEN LED2
N
TX SDA Flash SCL LED GND
Pin Descriptions Pin Number Pin Name Type Function
A1 GND Ground Ground. Input voltage connection. Connect IN to the input supply and bypass to GND with a 10μF or A2 IN Power larger ceramic capacitor. A3 SDA I/O Serial data input/output in the I2C Mode on AL3644. B1 SW Power Drain Connection for Internal NMOS and Synchronous PMOS Switches. Active high hardware flash to enable. Drive STROBE high to turn on Flash pulse. Internal B2 STROBE I/O pulldown resistor of 300kΩ between STROBE and GND. B3 SCL I/O Serial clock input for AL3644. Step-up DC-DC converter output. Connect a 10μF ceramic capacitor between this pin and C1 OUT Power GND. Active high enable pin. High = Standby, Low = Shutdown/Reset. Internal pulldown resistor of C2 HWEN I/O 300kΩ between HWEN and GND. C3 TORCH/TEMP I/O Torch terminal input or threshold detector for NTC temperature sensing and current scale back. D1 LED2 Power High-side current source output for flash LED. Configurable dual polarity power amplifier synchronization input. Internal pulldown resistor of D2 TX I/O 300kΩ between TX and GND. D3 LED1 Power High-side current source output for flash LED. AL3644 2 of 23 July 2019 Document number: DS41558 Rev. 1 - 2
www.diodes.com
© Diodes Incorporated
1mH 2.5V to 5V SW IN OUT 10mF 10mF
T AL3644 C U
LED1
D
TORCH/
O
TEMP
R P
Flash STROBE LED
W E
HWEN LED2
N
TX SDA Flash SCL LED GND
Pin Descriptions Pin Number Pin Name Type Function
A1 GND Ground Ground. Input voltage connection. Connect IN to the input supply and bypass to GND with a 10μF or A2 IN Power larger ceramic capacitor. A3 SDA I/O Serial data input/output in the I2C Mode on AL3644. B1 SW Power Drain Connection for Internal NMOS and Synchronous PMOS Switches. Active high hardware flash to enable. Drive STROBE high to turn on Flash pulse. Internal B2 STROBE I/O pulldown resistor of 300kΩ between STROBE and GND. B3 SCL I/O Serial clock input for AL3644. Step-up DC-DC converter output. Connect a 10μF ceramic capacitor between this pin and C1 OUT Power GND. Active high enable pin. High = Standby, Low = Shutdown/Reset. Internal pulldown resistor of C2 HWEN I/O 300kΩ between HWEN and GND. C3 TORCH/TEMP I/O Torch terminal input or threshold detector for NTC temperature sensing and current scale back. D1 LED2 Power High-side current source output for flash LED. Configurable dual polarity power amplifier synchronization input. Internal pulldown resistor of D2 TX I/O 300kΩ between TX and GND. D3 LED1 Power High-side current source output for flash LED. AL3644 2 of 23 July 2019 Document number: DS41558 Rev. 1 - 2
www.diodes.com
© Diodes Incorporated
