Application Circuit

Model performance :

- dynamic behavior not modeled (CQ/ESR stability, line/load transient response,

start-up, PSRR)

- static behavior is modelled by approximation to the real behavior of the device

over temperature

- the thermal simulations represent an approximation of the actual thermal

behavior of the device according to the JEDEC standards at Power = 2 Watt

and Ambient Temperature = 85°C

The OPTIREG™ Linear TLS835B2ELV is a linear voltage regulator with high performance,

very low dropout linear voltage and very low quiescent current. With an input voltage range of

3 V to 40 V and very low quiescent current of only 20 µA, this regulator is perfectly suitable for

automotive or other supply systems permanently connected to the battery. The new loop concept

combines fast regulation and very high stability while requiring only one small ceramic capacitor

of 1 µF at the output. At output currents below 100 mA the device has a very low dropout voltage

of only 100 mV for an output voltage of 5 V. This makes the TLS835B2ELV suitable for

automotive systems that need to operate during cranking condition.

The output voltage of the TLS835B2ELV is adjustable between 1.5 and 6 V.

The Device has internal protection features such as output current limitation and overtemperature

shutdown, protect the device from immediate damage caused by failures such as output shorted to

GND, overcurrent or overtemperature conditions.

Thermal model description:

THERMAL_MODEL = 1: JEDEC 1s0p, 600mm2 cooling area

THERMAL_MODEL = 2: JEDEC 1s0p, 300mm2 cooling area

THERMAL_MODEL = 3: JEDEC 1s0p, footprint

THERMAL_MODEL = 4: JEDEC 2s2p

THERMAL_MODEL = 10: No self heating, only TEMP value used as temperature

The resistor divider for a specific output voltage can

be calculated as follows:

R1 = ((VQ/Vadj) - 1)*R2

Vadj = Vref ≈ 1.5V (should be tweaked to

actual simulated value in the design parameters

for accurate results),

and R2 <= 250 kΩ

For VQ_max = 6 V, R1 <= 3*R2

and R1_max = 750 kΩ

{ Please double click here to enter design criteria }

{ Select required Voltage }

V_VQ := 5;

{ Select known Resistor: 1 for R1, 2 for R2 }

R1orR2 := 1;

{ Select Value for known Resistor (R1 or R2) }

R := 450k;

{ Vref defined as a typical value of 1.5 V in the datasheet }

Vref := 1.5;

{ Load Resistance }

R_Load := 100;

{ Number of Thermal Model }

THERMAL_MODEL := 1;

{ Ambient Temperature }

T_AMB := 25;

Voltage Regulator

Product info: TLS835B2ELV

Technical Assistance

Evaluation Board: TLS835B2ELV BOARD