AMC7637 datasheet(2/7 Pages) ADDTEK

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AMC7637

DD053_C

JUNE 2007

ABSOLUTE MAXIMUM RATINGS

(Note)

Input Voltage, VIN

Maximum Operating Junction Temperature, TJ

150

Storage Temperature Range

-65

C to 150

Lead Temperature (soldering, 10 seconds)

260

Note: 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

Thermal Resistance from Junction to Ambient,

250

OC /W

Junction Temperature Calculation:

TJ = TA+ (PD × θ JA).

The

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

Connect the ground pin to ground using a large pad or ground plane for better heat dissipation.

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-Ambient 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 = (125

OC – TA)/PD

BLOCK DIAGRAM

GND

VIN

VOUT

Current

Limiter

VREF

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