Automotive Low Dropout Linear Voltage Regulator LDO OPTIREG™ TLS835B2ELV Application Circuit

Open online SPICE simulator circuit link: atv_LDO_TLS835B2ELV_application_circuit_V2.TSC


Low Dropout Linear Voltage Regulator TLS835B2ELV
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;

Other circuits
Voltage Regulator
Product info: TLS835B2ELV



Technical Assistance
Evaluation Board: TLS835B2ELV BOARD