AMC DOC. #: AMC8878_D (LF)
AMC8878/8879
March 2004
LOW NOISE 150mA
LOW DROPOUT REGULATOR
TYPICAL APPLICATION
CBP
0.01
µF
AMC8878
AMC8879
OFF
ON
VIN
2.5V to 6V
CIN
1
µF
COUT
1
µF
VOUT
ABSOLUTE MAXIMUM RATINGS
(Note)
Input Voltage, VIN
12V
Operating Junction Temperature, TJ
150
OC
Storage Temperature Range
-65
OC to +150 OC
Lead Temperature (soldering, 10 seconds)
+260
OC
Power Dissipation, PD @ TA = 70
OC
150 mW
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
DB PACKAGE:
Thermal Resistance from Junction to Ambient,
θ JA
220
OC /W
Junction Temperature Calculation: TJ = TA + (PD × θ JA).
The
θ
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)=
θJA
TJ(
OC): Maximum recommended junction temperature
TA(
OC): Ambient temperature of the application
θJA(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
θ
JA = (+150
OC – TA)/PD
Copyright
2002, ADD Microtech Corp.
2
www.addmtek.com