AMC317ST datasheet(2/7 Pages) ADDTEK

2 / 7 page

AMC317

DD011_G

MARCH 2007

TYPICAL APPLICATION

Note 1: CIN is required if the regulator is far from the filter capacitor.

Note 2: COUT is recommended to improve the transient response.

Note 3: VOUT = 1.25V

( 1 +

) + I

ADJ (R2)

ABSOLUTE MAXIMUM RATINGS

(Note 1)

Input-Output Differential Voltage VD

……………..…………………………………………………………..20V

Operating Junction temperature

Plastic (T, ST Package) …………………………………………………………………………………… 150°C

Storage Temperature Range ………………………………………………………………………. -65°C to 150°C

Lead temperature (Soldering, 10 seconds) ………………………………………………………………….. 300°C

Note 1:

Exceeding these ratings could cause damage to the device.

All voltages are with respect to Ground.

Currents are positive into,

negative out of the specified terminal.

THERMAL DATA

T, ST PACKAGE:

Thermal Resistance-Junction to Tab,

3.0°C /W

Thermal Resistance-Junction to Ambient,

45°C /W

Junction Temperature Calculation:

TJ = TA + (PD × θJA).

The

JA numbers are guidelines for the thermal performance of the device/pc-board system.

All of the above assume no ambient airflow.

Maximum Power Calculation:

TJ(MAX) – TA(MAX)

PD(MAX)=

TJ(

OC): Maximum recommended junction temperature

TA(

OC): Ambient temperature of the application

JA(

OC/W): Junction-to-junction temperature thermal resistance of the package, and other heat dissipating materials.

The maximum power dissipation for a single-output regulator is :

PD(MAX) = [(VIN(MAX) - VOUT(NOM))] × IOUT(NOM) + VIN(MAX) × IQ

Where:

VOUT(NOM) = the nominal output voltage

IOUT(NOM) = the nominal output current, and

IQ = the quiescent current the regulator consumes at IOUT(MAX)

VIN(MAX) = the maximum input voltage

Then

JA = (150

OC – T

A)/PD

AMC317

VOUT

COUT

µF

CIN

0.1

µF

VIN

240

Ω

ADJ

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