R1224N Datasheet, PDF (7/42 Pages) RICOH electronics devices division – PWM/VFM step-down DC/DC Converter

TYPICAL APPLICATION AND APPLICATION HINTS
(1) Fixed Output Voltage Type (R1224Nxx2E/F/G/H/L/M except xx=10)
L
PMOS
C1
R1
5 VIN
4
EXT
VOUT 3
R1224N
1 _CE
C2
GND
2
SD
C3
LOAD
R1224N
CE CONTROL
PMOS: HAT1044M (Hitachi)
SD1 : RB063L-30 (Rohm)
C1 : 10µF (Ceramic Type)
R1 : 10Ω
L : CR105-270MC (Sumida, 27µH)
C3 : 47µF (Tantalum Type)
C2 : 0.1µF (Ceramic Type)
(2) Adjustable Output Type (R1224N102G/H/M) Example: Output Voltage=3.2V
L
C1
R1
5 VIN
PMOS
4
EXT
VFB 3
C4
R4
R3
R1224N
1 _CE
C2
GND
2
SD _R2
C3
LOAD
CE CONTROL
PMOS: HAT1044M (Hitachi) L : CR105-270MC (Sumida, 27µH)
SD1 : RB063L-30 (Rohm)
C3 : 47µF (Tantalum Type)
C1 : 10µF (Ceramic Type) C2 : 0.1µF (Ceramic Type) C4: 1000pF (Ceramic Type)
R1 : 10Ω, R2=22kΩ, R3=2.7kΩ, R4=33kΩ
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