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AL3644 Datasheet

DUAL 1.5A CURRENT SOURCE CAMERA FLASH LED DRIVER

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AL3644
DUAL 1.5A CURRENT SOURCE CAMERA FLASH LED DRIVER
Description
The AL3644 is a dual LED flash driver that provides a high level of
adjustability within a small solution size. The AL3644 utilizes a 2MHz
or 4MHz fixed frequency synchronous boost converter to provide
power to the dual 1.5A constant current LED sources. The dual 128
level current sources provide the flexibility to adjust the current ratios
between LED1 and LED2. An adaptive regulation method ensures the
current sources remain in regulation and maximizes efficiency.
Features of the AL3644 are controlled via an I2C-compatible
interface. These features include: hardware flash and hardware torch
pins (STROBE and TORCH/TEMP), a TX interrupt, and an NTC
thermistor monitor. The device offers independently programmable
currents in each output leg to drive the LEDs in a Flash or Movie
Mode (Torch) condition.
The 2MHz or 4MHz switching frequency options, overvoltage
protection (OVP), and adjustable current limit allow for the use of tiny,
low-profile inductors and (10µF) ceramic capacitors. The device
operates over a 40°C to +85°C ambient temperature range.
Features
Dual Independent 1.5A LED Current Source Programmability
Accurate and Programmable LED Current Range from 1.4mA to
1.5A
Torch Currents up to 360mA (AL3644TT)
Flash Timeout Values up to 1.6 seconds (AL3644TT)
Optimized Flash LED Current During Low Battery Conditions
(Input Voltage Flash Monitor)
> 85% Efficiency in Torch Mode (at 100mA) and Flash Mode (at
1A to 1.5A)
Grounded Cathode LED Operation for Improved Thermal
Management
Small Solution Size: < 16mm2
Hardware Strobe Enable (STROBE)
Synchronization Input for RF Power Amplifier Pulse Events (TX)
Hardware Torch Enable (TORCH/TEMP)
Remote NTC Monitoring (TORCH/TEMP)
400kHz I2C-Compatible Interface
AL3644 (I2C Address = 0x63)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Camera Phone White LED Flash
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Pin Assignments
Top View
A1 A2 A3
B1 B2 B3
C1 C2 C3
D1 D2 D3
Pin A1
U-WLB1713-12
AL3644
Document number: DS41558 Rev. 1 - 2
1 of 23
www.diodes.com
July 2019
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AL3644 Datasheet

DUAL 1.5A CURRENT SOURCE CAMERA FLASH LED DRIVER

No Preview Available !

Typical Applications Circuit
2.5V to 5V
10mF
AL3644
1mH
SW
IN OUT
AL3644
TORCH/
TEMP
STROBE
LED1
Flash
LED
HWEN
TX
SDA
SCL
GND
LED2
Flash
LED
10mF
Pin Descriptions
Pin Number
A1
A2
A3
Pin Name
GND
IN
SDA
Type
Function
Ground
Power
Ground.
Input voltage connection. Connect IN to the input supply and bypass to GND with a 10μF or
larger ceramic capacitor.
I/O Serial data input/output in the I2C Mode on AL3644.
B1 SW Power Drain Connection for Internal NMOS and Synchronous PMOS Switches.
B2
STROBE
I/O
Active high hardware flash to enable. Drive STROBE high to turn on Flash pulse. Internal
pulldown resistor of 300kΩ between STROBE and GND.
B3
SCL
I/O Serial clock input for AL3644.
C1
OUT
Power
Step-up DC-DC converter output. Connect a 10μF ceramic capacitor between this pin and
GND.
C2
HWEN
I/O
Active high enable pin. High = Standby, Low = Shutdown/Reset. Internal pulldown resistor of
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.
D2
TX
I/O
Configurable dual polarity power amplifier synchronization input. Internal pulldown resistor of
300kΩ between TX and GND.
D3
LED1
Power High-side current source output for flash LED.
AL3644
Document number: DS41558 Rev. 1 - 2
2 of 23
www.diodes.com
July 2019
© Diodes Incorporated


Part Number AL3644
Description DUAL 1.5A CURRENT SOURCE CAMERA FLASH LED DRIVER
Maker Diodes
Total Page 23 Pages
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