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RS7212-33VFP Datasheet(PDF) 5 Page - Orister Corporation

Part # RS7212-33VFP
Description  300mA CMOS LDO Linear Regulator with Enable and Fast Discharge Function
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Manufacturer  ORISTER [Orister Corporation]
Direct Link  http://www.orister.com
Logo ORISTER - Orister Corporation

RS7212-33VFP Datasheet(HTML) 5 Page - Orister Corporation

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DS‐RS7212‐02    September, 2009 
www.Orister.com
 
Where  (TJ‐TA)  is  the  temperature  difference  between  the  RS7212  die  junction  and  the  surrounding  air, θJC  is  the  thermal 
resistance  of  the  package  chosen,  and θCA  is  the  thermal  resistance  through  the  printed  circuit  board,  copper  traces  and 
other materials to the surrounding air. For better heat‐sinking, the copper area should be equally shared between the VIN, 
VOUT, and GND pins. 
 
The thermal resistance θJA of SOT‐25 package of RS7212 is 250°C/W. Based on a maximum operating junction temperature 
125°C with an ambient of 25°C, the maximum power dissipation will be: 
 
W
40
0
250
25
125
T
T
P
CA
JC
A
J
MAX
.
)
(
)
(
=
−
=
+
−
=
θ
θ
 
 
Thermal characteristics were measured using a double sided board with 1”x2” square inches of copper area connected to the 
GND pin for “heat spreading”. 
 
Dropout Voltage 
A regulator’s minimum input‐output voltage differential, or dropout voltage, determines the lowest usable supply voltage. In 
battery‐powered  systems,  this  will  determine  the useful end‐of‐life  battery  voltage.  The  RS7212  use  a  P‐  channel MOSFET 
pass transistor, its dropout voltage is a function of drain‐to‐source on‐resistance RDS(ON) multiplied by the load current. 
 
OUT
ON
DS
OUT
IN
DROPOUT
I
R
V
V
V
×
=
−
=
)
(
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 


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