2.4V CW LASER DIODE DRIVER
Rev C2, Page 2/7
The iC-WK/L device is a driver for laser diodes in continuous wave operation which requires only four external
components. The wide power supply range of 2.4V to 6V and the integrated reverse battery protection allow
for battery operation with a minimum of two cells. A reversed battery connection destroys neither the iC nor
the laser diode.
The iC includes integrated circuitry protecting against destruction by ESD, excessive temperature and over-
current and a soft start which regulates the power and protects the laser diode when the power supply is
switched on. The iC also filters the laser diode power supply for transients.
The power supply is regulated and adapted for the laser diode used by an external resistor at MDA. The
monitor current acts as a reference and is regulated independent of the influence of temperature and supply
voltage (range: 10µA to 2.5mA). The capacitor at CI determines the recovery time constants and start-up time.
A second monitor input, pin MDK, allows the driver to be used for other types of laser diode configuration;
alternatively, it can be used as an analog modulation input (DC to a few kHz).
In the event of failure, such as overcurrent in the laser path with a lack of feedback, for example, a quick
power lockout is activated. The shutdown continues until power is reapplied, permitting a restart. The strain
on power packs and batteries is relieved and the laser class is retained even in the event of a disturbance.
IC-WK offers additional protection by means of spike detection at pin MDA. Should spike or oscillation occur
at pin MDA the power lockout is activated.
PACKAGES SO8, MSOP8 to JEDEC Standard
PIN CONFIGURATION SO8
PIN CONFIGURATION MSOP8 (3mm)
No. Name Function
1 GND Ground
2 CI Capacitance for Power Control
3 AGND Reference Ground for CI, RM
4 MDK Monitor Input 2
(MD Cathode, modulation)
5 MDA APC Setup, Monitor Input 1
6 VCC +2.4 .. +6V Supply Voltage
7 LDA Laser Supply (LD Anode)
8 LDK Driver Output (LD Cathode)