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Step-down DC/DC Converter Controller
with Voltage Detector
51 6(5,(6
1
NO. EA-066-0204
OUTLINE
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APPLICATIONS
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R1221N
2
BLOCK DIAGRAM
PWM/VFM
CONTROL
Soft Start
Chip Enable
OSC
Vref
Vref
Protection
V
IN
V
OUT
CE
GND
EXT
VD
OUT
SELECTION GUIDE
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Code
Contents
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R1221N
3
PIN CONFIGURATION
SOT-23-6W
5
6
4
V
OUT
GND CE
(mark side)
1
2
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OUT
V
IN
PIN DESCRIPTION
Pin No.
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Description
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R1221N
4
ELECTRICAL CHARACTERISTICS
R1221NxxxA (C,E,G) Output Voltage : Vo, Detector Threshold : V
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Item
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Typ.
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