ATLS3A201D datasheet(2/9 Pages) ANALOGTECHNOLOGIES

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Analog Technologies

ATLS3A201D

Constant Current Laser Driver

2.5VR

Analog Output

Reference voltage. It can source 3mA max., with 5

μVP-P noise between 0.1 to 10Hz and

25ppm/

°C (max.) stability.

LIS

Analog Input

Laser current setting voltage. There is an input resistor of 10M tied to GND. Setting it

from 0V to 2.5V will set the laser current from 0A to 3A linearly.

LIO

Analog Output

Laser current output indication. 0V to 2.5V indicates the laser current being from 0A to

3A linearly.

LIGD

Analog Output

Laser current good, control loop indication. When this pin is stabilized and the value is

between 1V and 2.4V, the output voltage to the laser, Pin 9 LDA, will be 4.5V to 0V

linearly, the laser current is stabilized, and the control loop is stable.

LDA

Analog Output Laser diode anode. Connect it to the anode of the laser diode.

LDC

Analog Output Laser diode cathode. Connect it to the cathode of the laser diode.

PGND

Power Ground

Power ground pin. Connect this pin directly to power supply return path line.

VPS

Power Input

Power supply voltage. The driver works from VVPS = 3.1V to 6V.

SPECIFICATIONS

Table 2 Characteristics (Tambient = 25

°C)

Parameter

Test Condition

Value

Unit

Laser driver efficiency

IOUT = 3A, VOUT= 2.5V, & VVPS = 5V

≥90

Maximum output current

VLDA ≤VLDAMAX

Output current noise

(VIN = 5V; VOUT = 2.5V;

IOUT = 500mA)

VIN = 5V; VOUT = 2.5V;

IOUT = 500mA

4.48

μAP-P

@0.1Hz-

10Hz

Stability @ 3A

The range of TA is 20

°C ∼ 80°C

±0.2

Laser current control signal range at LIS

VVPS = 3.1V

∼ 6V

0 ~ VVPS

− 0.2

LIS control accuracy

Relative accuracy = (accuracy current – set

point current) / set point temp.

±0.2

Laser current indication signal range at

LIO

VVPS = 3.1V

∼ 6V

0 ~ 2.5

LIO indication accuracy

VVPS = 3.1V

∼ 6V

±0.2

Reference voltage

VVPS = 3.1V

∼ 6V

2.5

Reference Voltage temperature co

efficiency

VVPS = 3.1V

∼ 6V

Output voltage range at LDA

VVPS = 3.1V

∼ 6V

Depending on VVPS

PWM frequency

500

kHz

Power supply voltage range

3.1 ~ 6

Maximum power supply voltage

−

Start-up time

Typical pull-down current at LDGD

Operating case temperature

I = 3A, VIN = 3.3V or 5V, VOUT = 2.5V

−40 ~ 85

°C

Rise times of small signal

IOUT = 3A, VOUT = 2.5V, & VVPS = 5V

µS

Fall times of small signal

IOUT = 3A, VOUT = 2.5V, & VVPS = 5V

µS

Rise times of large signal

352

µS

Fall times of large signal

184

µS

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