AMC7637
ABSOLUTE MAXIMUM RATINGS (Note)
8V
Input Voltage, VIN
Maximum Operating Junction Temperature, TJ
Storage Temperature Range
150°C
-65°C to 150°C
260°C
Lead Temperature (soldering, 10 seconds)
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, θJA
250OC /W
Junction Temperature Calculation: TJ = TA+ (PD × θJA).
The θJA 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)
=
θJA
TJ(OC):
Maximum recommended junction temperature
TA(OC):
Ambient temperature of the application
θJA(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:
D(MAX) = [(VIN(MAX) - VOUT(NOM))] × IOUT(NOM) + VIN(MAX) × IQ
P
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
θJA = (125OC – TA)/PD
Then
BLOCK DIAGRAM
VIN
Current
Limiter
VOUT
VREF
GND
Copyright © 2007 ADDtek Corp.
2
DD053_C -- JUNE 2007
ADDTEK [ ADDTEK CORP ]
