AMC317
TYPICAL APPLICATION
VIN
VOUT
AMC317
R1
ADJ
240Ω
CIN
0.1µF
COUT
1µF
R2
5K
Note 1: CIN is required if the regulator is far from the filter capacitor.
Note 2: COUT is recommended to improve the transient response.
R2
R1
Note 3: VOUT = 1.25V
1 +
+ IADJ (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:
3.0°C /W
45°C /W
Thermal Resistance-Junction to Tab, θJT
Thermal Resistance-Junction to Ambient, θJA
Junction Temperature Calculation: TJ = TA + (PD × θJA).
The θJA 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)
=
θJA
TJ(OC): Maximum recommended junction temperature
TA(OC): Ambient temperature of the application
O
Junction-to-junction temperature thermal resistance of the package, and other heat dissipating materials.
θJA( C/W):
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
O
Then
θJA = (150 C – TA)/PD
Copyright © 2006 ADDtek Corp.
2
DD011_G -- MARCH 2007
ADDTEK [ ADDTEK CORP ]
