RT9176 Ver la hoja de datos (PDF) - Richtek Technology

Número de pieza

componentes Descripción

Fabricante

RT9176

1.5A Fixed and Adjustable Low Dropout Positive Voltage Regulators

Richtek Technology 

RT9176

RT9176

RP Parasitic

Line Resistance

VIN

VIN

VOUT

GND

R1

(Connect R1 to VOUT or case)

R2

RL

Connect R2 to load

Figure 6. Best Load Regulation Using Adjustable Output

Regulator

Thermal Protection

RT9176 has thermal protection which limits junction

temperature to 150°C. However, device functionality is only

guaranteed to a maximum junction temperature of +125°C.

The power dissipation and junction temperature for RT9176

are given by

PD = (VIN - VOUT) x IOUT

TJUNCTION = TAMBIENT + (PD x θJA)

Note: TJUNCTION must not exceed 125°C

Current Limit Protection

RT9176 is protected against overload conditions. Current

protection is triggered at typically 1.75A.

Thermal Consideration

The RT9176 series contain thermal limiting circuitry

designed to protect itself from over-temperature conditions.

Even for normal load conditions, maximum junction

temperature ratings must not be exceeded. As mention

in thermal protection section, we need to consider all

sources of thermal resistance between junction and

ambient. It includes junction-to-case, case-to-heat-sink

interface, and heat sink thermal resistance itself.

Junction-to-case thermal resistance is specified from the

IC junction to the bottom of the case directly below the

die. Proper mounting is required to ensure the best

possible thermal flow from this area of the package to the

heat sink. The case of all devices in this series is

electrically connected to the output. Therefore, if the case

of the device must be electrically isolated, a thermally

conductive spacer is recommended.

www.richtek.com

10

DS9176-11 March 2007

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