R1224N Datasheet, PDF (5/42 Pages) RICOH electronics devices division – PWM/VFM step-down DC/DC Converter

R1224N
ELECTRICAL CHARACTERISTICS
• R1224Nxx2X (X=E/F/G/H/L/M) except R1224N102X
Topt=25°C
Symbol
Item
VIN
Operating Input Voltage
VOUT Step-down Output Voltage
∆VOUT/ Step-down Output Voltage
∆Topt Temperature Coefficient
fosc Oscillator Frequency
∆fosc/ Oscillator Frequency
∆Topt Temperature Coefficient
IDD1
Supply Current 1
Istandby Standby Current
IEXTH EXT “H” Output Current
IEXTL EXT “L” Output Current
ICEH
ICEL
VCEH
VCEL
Maxdty
VFMdty
CE “H” Input Current
CE “L” Input Current
CE “H” Input Voltage
CE “L” Input Voltage
Oscillator Maximum
Duty Cycle
VFM Duty Cycle
Conditions
Min.
2.3
VIN=VCE=VSET+1.5V, IOUT=−100mA VSET
When VSET ^<= 1.5V, VIN=VCE=3.0V ×0.98
Typ.
VSET
Max.
18.5
VSET
×1.02
Unit
V
V
−40°C ^<= Topt ^<= 85°C
±100
ppm/°C
VIN=VCE=VSET+1.5V, IOUT=−100mA
When VSET ^<= 1.5, VIN=VCE=3.0V
L/M Version
144 180 216 kHz
E/G Version
240 300 360
F/H Version
400 500 600
−40°C ^<= Topt ^<= 85°C
VIN=VCE=VOUT=18.5V
E/F/L/M Version
G version
H version
VIN=18.5V, VCE=0V, VOUT=0V
VIN=8V, VEXT=7.9V, VOUT=8V,
VCE=8V
VIN=8V, VEXT=0.1V, VOUT=0V,
VCE=8V
VIN=VCE=VOUT=18.5V
VIN=VOUT=18.5V, VCE=0V
VIN=8V, VOUT=0V
VIN=8V, VOUT=0V
±0.2
%/°C
20
30
50
60
µA
40 80
0.0 0.5 µA
−17 −10 mA
20 30
mA
0.0 0.5 µA
−0.5 0.0
µA
1.5
V
0.3 V
100
%
E/F/L Version
35
%
VUVLO1
VUVLO2
tstart
tprot
UVLO Voltage
VIN=VCE=2.5V to 1.5V, VOUT=0V
UVLO Release Voltage
VIN=VCE=1.5V to 2.5V, VOUT=0V
Delay Time by Soft-Start function
Delay Time for protection circuit
VIN=VSET+1.5V, IOUT=−10mA
VCE=0V→VSET+1.5V
VIN=VCE=VSET+1.5V
VOUT=VSET+1.5V→0V
1.8 2.0 2.2 V
VUVLO1
+0.1
2.3
V
5
10 20 ms
5
15 30 ms
5