1161 Ringwood Ct, #110, San Jose, CA 95131, U. S. A. Tel.: (408) 748-9100, Fax: (408) 770-9187

www.analogtechnologies.com

Copyrights 2000-2022, Analog Technologies, Inc. All Rights Reserved. Updated on 7/4/2022

Email: staff@analogti.com/sales@analogti.com

2

Analog Technologies

ATLS3A212

High Voltage Constant Current 3A Laser Driver

Warning:

1. The output voltage must be within 20% to 80% of

VPS.

2. Both the surface mount and the through hole types of

packages can only be soldered manually on the board by

a solder iron of < 310

°C (590°F), do not use a reflow

oven to solder this laser driver.

For noise sensitive applications, please be aware that this

laser driver has very low noise between DC to 10kHz, but a

switching frequency, 500kHz.

Figure 2 is the top view of the ATLS3A212, which also

shows the pin names and locations. Its thickness is 4.5mm.

The pin functions and specifications are described in Table 1

below.

Figure 2. Pin Names and Locations

Table 1. Pin Function Descriptions

Pin

#

Name

Type

Description

1

LPGD

Digital Output

Loop Good indication. When the laser driver's output current equals to the set-point current

value, and there is no short nor open circuit at the output, this pin is pulled up high by an

internal 3k

Ω resistor to an internal 4V power supply as shown in Figure 3; when the output

current is not equal to the set-point current, such as there is an open circuit at the output, or

the load has too high a resistance that even the output voltage reaches the power supply

voltage, the output current is still lower than the set-point value, this pin is pulled low by an

open drain MOSFET of which Rdson <500

Ω. When outputting the low value, the sinking

capability is <0.5V at 1mA.

2

SBDN

Analog/Digital

Input

Standby and Shutdown Control. This pin has 3 states: between 0V

∼0.4V, it shuts down the

entire laser driver; between 2.1V

∼ 2.4V, it sets the laser driver to standby mode; between

2.6V

∼ 15V, it sets the laser driver to operation mode. The input current on this pin is

<2µA.

3

PCN

Digital Input

Pulse Control input. This pin toggles the laser output current to change between two pre-set

values: a low value set by the LISL pin @ PCN = 0V

∼ 0.4V and a high value set by the

LISH pin @ PCN = 1.4V

∼ 4V. This PCN pin is pulled high to an internal 4V rail by a

1M

Ω resistor and there is a serial 20kΩ resistor between PCN and the electronic switch, see

Figure 3. Between 0V

∼ 4V, the pull up resistor causes most of the current on this pin, the

electronic switch input current is < ±1µA. The maximum voltage on this pin is 16V, at

which the pull down current will be caused by the serial 20k

Ω clamped by an over voltage

protector of 5V, the current will be (16V

−5V)/20kΩ = 110µA.

The rise and fall time of the output is 28µs when PCN pin is switched.

4

GND

Signal Ground

Signal Ground pin. Connect ADC and DAC grounds here. When using POTs

(potentiometer) to set the output currents, connect the ground terminal of the POTs here.

See Figure 7.

5

2.5VR

Analog Output

Voltage Reference, 2.5V, output. It can source and sink up to 10mA output current, with a

very low 5

Mode, this pin is still working.