R1224N Datasheet, PDF (6/42 Pages) RICOH electronics devices division – PWM/VFM step-down DC/DC Converter

R1224N
• R1224N102X (X=G/H/M)
Symbol
VIN
VFB
∆VFB/
∆Topt
Item
Operating Input Voltage
Feedback Voltage
Feedback Voltage
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
VUVLO1
CE “H” Input Current
CE “L” Input Current
CE “H” Input Voltage
CE “L” Input Voltage
Oscillator Maximum Duty Cycle
UVLO Voltage
Conditions
VIN=VCE=3.5V, IFB=−100mA
−40°C ^<= Topt ^<= 85°C
VIN=VCE=3.5V, IFB=−100mA
M Version
G Version
H Version
−40°C ^<= Topt ^<= 85°C
VIN=VCE=VFB=18.5V
M Version
G Version
H Version
VIN=18.5V, VCE=0V, VFB=0V
VIN=8V, VEXT=7.9V, VFB=8V,
VCE=8V
VIN=8V, VEXT=0.1V, VFB=0V,
VCE=8V
VIN=VCE=VFB=18.5V
VIN=VFB=18.5V, VCE=0V
VIN=8V, VFB=0V
VIN=8V, VFB=0V
VIN=VCE=2.5V to 1.5V, VFB=0V
VUVLO2 UVLO Release Voltage
VIN=VCE=1.5V to 2.5V, VFB=0V
tstart
tprot
Delay Time by Soft-Start function
Delay Time for protection circuit
VIN=2.5V, IFB=−10mA
VCE=0V→2.5V
VIN=VCE=2.5V
VFB=2.5V→0V
Min.
2.3
0.98
Typ.
1.00
Topt=25°C
Max. Unit
18.5 V
1.02 V
±100
ppm/°C
144
240
180
300
216
360
kHz
400 500 600
±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
%
1.8 2.0 2.2 V
VUVLO1
+0.1
2.3
V
5
10 20 ms
5
15 30 ms
6