R1230D Datasheet, PDF (5/20 Pages) RICOH electronics devices division – PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier

s ELECTRICAL CHARACTERISTICS
qR1230D**1A/B
Symbol
Item
VIN Operating Input Voltage
VOUT Step-down Output Voltage
∆VOUT/
∆T
fosc
fosc
IDD
Step-down Output Voltage
Temperature Coefficient
Oscillator Frequency(xx1A)
Oscillator Frequency(xx1B)
Supply Current(xx1A)
IDD Supply Current(xx1B)
Istb Standby Current
RONP ON Resistance of
Pch Transistor
RONN ON Resistance of
Nch Transistor
ILXleak Lx Leakage Current
IVOUT VOUT Leakage Current
ICE CE Input Current
VCEH CE "H" Input Voltage
VCEL CE "L" Input Voltage
Maxdty Oscillator Maximum Duty Cycle
VLX Lx Limit Voltage
Conditions
VIN=VCE=VSET+1.5V, VMODE=0V,
IOUT=10mA
-40°C ≤ Topt ≤ 85°C
VIN=VCE=VSET+1.5V
VIN=VCE=VSET+1.5V
VIN=VCE=VSET+1.5V,
VOUT=VMODE=0V
VIN=VCE=VSET+1.5V,
VOUT=VMODE=0V
VIN=5.5V, VCE=VOUT=0V
VIN=5.0V
VIN=5.0V
VIN=5.5V, VCE=0V, VLX=0V/5.5V
VIN=5.5V, VCE=0V, VLX=0V/5.5V
VIN=5.5V, VMODE=0V, VCE=5.5V/0V
VIN=5.5V, VOUT=0V
VIN=2.4V, VOUT=0V
VMODE=0V
VMODE= VOUT=0V, VIN=VCE=3.0V
Tstart Delay Time by Soft-Start function at no load, VIN=VCE=VSET+1.5V
Tprot Delay Time for protection circuit VIN=VCE=VSET+1.5V, VMODE=0V
VUVLO1 UVLO Threshold Voltage
VIN=VCE=2.5V->1.5V, VOUT=0V
VUVLO2 UVLO Released Voltage
VIN=VCE=1.5V->2.5V, VOUT=0V
IMODE MODE Pin Input Current
VIN=5.5V, VCE=0V, VMODE=5.5V/0V
VMODEH MODE ”H” Input Voltage
VIN=VCE=5.5V, VOUT=0V
VMODEL MODE ”L” Input Voltage
VIN=VCE=2.4V, VOUT=0V
VFMdty VFM Duty Cycle
VIN=VCE= VMODE=2.4V, VOUT=0V
MIN.
2.4
TYP.×
0.980
425
680
(Topt=25°C)
TYP. MAX. Unit
5.5 V
VSET TYP.× V
1.020
±150
ppm
/°C
500 575 kHz
800 920 kHz
230 300 µA
250 350 µA
0
5 µA
0.20 0.35 0.60 Ω
0.20 0.45 0.70 Ω
-0.1
0.0
0.1 µA
-0.1
0.0
0.1 µA
-0.1
0.0
0.1 µA
1.5
V
0.3 V
100
%
VIN-0.15 VIN-0.35 VIN- V
0.55
0.5
1.5 2.5 ms
0.5
1.5 2.5 ms
1.8
2.1 2.2 V
1.9
2.2 2.3 V
-0.1
0.1 µA
1.5
V
0.3 V
55
65
85 %
Rev. 1.12
-5-