RT9009 データシートの表示（PDF） - Richtek Technology
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RT9009 Datasheet PDF : 9 Pages
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RT9009
Typical Application Circuit
VIN
CIN
2.2uF
Chip Enable
1 VIN
VOUT 3
2 EN
RT9009
ADJ 4
GND
5
VOUT
COUT
R1
4.7uF
R2
VOUT = 1.25 x (1+ R1 ) Volts
R2
Note: The value of R2 should be less than 80k to
maintain regulation.
Figure 1. Adjustable Operation
Function Pin Description
Pin No. Pin Name
Pin Function
1
VIN
2
EN
3
VOUT
4
ADJ
5
GND
Power Supply Input.
Chip Enable (Active High). When the EN goes to a logic low, the device will be
shutdown.
Regulator Output.
Output Voltage Feedback Input. If external feedback resistors are applied, the output
voltage will be :
VOUT
=
1.25
×
(1+
R1
R2
)
Volts
Ground.
Function Block Diagram
EN
GND
VREF
Logic Control
POR/OCP/OTP
-
Driver
+
ADJ
VIN
VOUT
www.richtek.com
2
DS9009-01 April 2011
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