RT9164A-30PL datasheet(11/14 Pages) RICHTEK

Part #	RT9164A-30PL

Description	1A Fixed and Adjustable Low Dropout Positive Voltage Regulators

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Manufacturer	RICHTEK [Richtek Technology Corporation]

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11 / 14 page

RT9164A

11

DS9164A-13 August 2007

www.richtek.com

PD = (VIN - VOUT) x IOUT

TJUNCTION = TAMBIENT + (PD x

θJA)

Note: TJUNCTION must not exceed 125°C

Current Limit Protection

RT9164A is protected against overload conditions. Current

protection is triggered at typically 1.8A.

Thermal Consideration

The RT9164A 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.

VIN

VOUT

ADJ

RT9164A

R1

R2

V

IN

Connect R2 to load

(Connect R1 to VOUT

or case)

R

L

R

P Parasitic

Line Resistance

Figure 6. Best Load Regulation Using Adjustable

Output Regulator

Thermal Protection

RT9164A 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 RT9164A

are given by

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RT9164A-30PL Datasheet(PDF) 11 Page - Richtek Technology Corporation

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