R1230D Datasheet, PDF (6/20 Pages) RICOH electronics devices division – PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier

qR1230D001C/D
Symbol
Item
Conditions
VIN Operating Input Voltage
VFB Feedback Voltage
VIN=VCE=VSET+1.5V, VMODE=0V,
IOUT=10mA
∆VFB/ Feedback Voltage
∆T ^{Temperature Coefficient}
-40°C ≤ Topt ≤ 85°C
fosc Oscillator Frequency(xx1C) VIN=VCE=VSET+1.5V
fosc Oscillator Frequency(xx1D) VIN=VCE=VSET+1.5V
IDD Supply Current(xx1C)
VIN=VCE=5.5V, VFB=VMODE=0V
IDD Supply Current(xx1D)
VIN=VCE=5.5V, VFB=VMODE=0V
Istb Standby Current
VIN=5.5V, VCE=VFB=0V
RONP ON Resistance of
VIN=5.0V
Pch Transistor
RONN ON Resistance of
VIN=5.0V
Nch Transistor
ILXleak Lx Leakage Current
VIN=5.5V, VCE=0V, VLX=0V/5.5V
IVFB VFB Leakage Current
VIN=5.5V, VCE=0V, VFB=0V/5.5V
ICE CE Input Current
VIN=5.5V, VMODE=0V, VCE=5.5V/0V
VCEH CE "H" Input Voltage
VIN=5.5V, VFB=0V
VCEL CE "L" Input Voltage
VIN=2.4V, VFB=0V
Maxdty Oscillator Maximum Duty Cycle VMODE=0V
VLX Lx Limit Voltage
VIN=VCE=3.0V, VMODE=0V, VFB=0V
Tstart Delay Time by Soft-Start function at no load, VIN=VCE=VSET+1.5V
Tprot Delay Time for protection circuit VIN=VCE=3.6V, VMODE=0V
VUVLO1 UVLO Threshold Voltage
VIN=VCE=2.5V->1.5V, VFB=0V
VUVLO2 UVLO Released Voltage
VIN=VCE=1.5V->2.5V, VFB=0V
IMODE MODE Pin Input Current
VIN=5.5V, VMODE=5.5V/0V, VCE=0V
VMODE MODE ”H” Input Voltage
VIN=VCE=5.5V, VFB=0V
VMODEL MODE ”L” Input Voltage
VIN=VCE=2.4V, VFB=0V
VFMdty VFM Duty Cycle
VIN=VCE=VMODE=2.4V, VFB=0V
MIN.
2.4
0.776
TYP.
0.800
(Topt=25°C)
MAX. Unit
5.5 V
0.824 V
±150
ppm
/°C
425 500 575 kHz
680 800 920 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
0.0
-0.1
0.0
1.5
100
VIN-0.15
0.5
1.8
1.9
-0.1
1.5
VIN-
0.35
1.5
1.5
2.1
2.2
55
65
0.1 µA
0.1 µA
0.1 µA
V
0.3 V
%
VIN- V
0.55
2.5 ms
ms
2.2 V
2.3 V
0.1 µA
V
0.3 V
85 %
Rev. 1.12
-6-