SI-3010LLSL-TL Ver la hoja de datos (PDF) - Allegro MicroSystems

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SI-3010LLSL-TL

1.5 A, Ultra-Low-Dropout, 1~3.3 V Regulator

Allegro MicroSystems 

LRinegeuarlators

SI-3010LLSL

1.5 A, Ultra-Low-Dropout,

1~3.3 V Regulator

APPLICATIONS INFORMATION

Input Capacitor (CI, 0.1 µF to 10 µF). This is necessary

either when the input line includes inductance or when the

wiring is long.

Output Capacitor (CO, ≥ 47 µF). This device is de-

signed for use with a very low ESR output capacitor such

as a ceramic capacitor. Output oscillation may occur with

an ESR greater than 500 mΩ.

Output Voltage Adjustable Resistors (R1 and R2).

The output voltage can be adjusted by R1 and R2. 10 kΩ

or 11 kΩ for R2 is recommended.

R1 = (VO – Vref)/(Vref/R2)

Soft-Start Capacitor (CSS). This capacitor between VO

and ADJ will set up starting time.

Heat Radiation and Reliability. The reliability of the

device is directly related to the junction temperature (TJ) in

its operation. Accordingly, careful consideration should be

given to heat dissipation.

The inner frame on which the pass transistor is mounted is

connected to terminals 7 and 8. Therefore, it is very

effective for heat radiation to enlarge the copper area that is

connected to these terminals. The graph illustrates the

effect of the copper area on the junction-to-ambient thermal

resistance (RθJA).

ENABLE Input. The ENABLE (control) input features

an internal pull-down resistor. Leaving this input open

causes the output to turn off.

Determination of DC Input Voltage. The minimum

input voltage VI(min) should be higher than the sum of the

fixed output voltage and the maximum rated dropout

voltage.

Overcurrent Protection. The SI-3000LLSL series has

a built-in fold-back type overcurrent protection circuit,

which limits the output current at a start-up mode. It thus

cannot be used in applications that require current at the

start-up mode such as:

(1) constant-current load,

(2) power supply with positive and negative outputs to

common load (a center-tap type power supply), or

(3) raising the output voltage by putting a diode or a

resistor between the device ground and system ground.

Thermal Protection. Circuitry turns off the pass

transistor when the junction temperature rises above 135°C.

It is intended only to protect the device from failures due to

excessive junction temperatures and should not imply that

output short circuits or continuous overloads are permitted.

The junction temperature (TJ) can be determined from

either of the following equations:

TJ = (PD × RθJA) + TA

or

TJ = (PD × RθJL) + TL

where PD = IO × (VI – VO),

TL is the temperature of lead 8, and

RθJL = 36°C/W.

Parallel Operation. Parallel operation to increase load

current is not permitted.

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