R1232D Datasheet, PDF (5/24 Pages) RICOH electronics devices division – PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER

R1232D
ELECTRICAL CHARACTERISTICS
• R1232DxxxA/C
Symbol
Item
Conditions
VIN
Operating Input Voltage
VOUT
Step-down Output Voltage
VIN=VCE=5.0V, IOUT=10mA
VFB
Feedback Voltage
∆VOUT/∆Topt
Step-down Output Voltage
Temperature Coefficient
VIN=VCE=5.0V, IOUT=10mA
−40°C ^<= Topt ^<= 85°C
fosc Oscillator Frequency
IDD
Supply Current
VIN=VCE =VSET +1.5V
VIN=VCE =5.5V, VOUT=5.5V
Istandby Standby Current
VCE=VOUT=0V, VIN= 5.5V
ILXleak
LX Leakage Current
VIN=5.5V,VCE=0V
VLX=0V/5.5V
RONP
ON Resistance of Pch Transistor VIN=5.0V, ILX=200mA
RONN
ON Resistance of Nch Transistor VIN=5.0V, ILX=200mA
Maxduty Oscillator Maximum Duty Cycle
tstart Soft-start Time
VIN=VCE =5.0V, at no load
tprot Protection Delay Time
VIN=VCE =5.0V
ILXlimit Lx Current Limit
VIN=VCE =5.0V
VUVLO1 UVLO Detector Threshold
VIN=VCE =2.6V-> 1.5V
VUVLO2 UVLO Released Voltage
VIN=VCE =1.5V-> 2.6V
ICE
IVOUT
VCEH
VCEL
VTESTL
CE Input Current
VOUT Leakage Current
CE "H" Input Voltage
CE "L" Input Voltage
TEST pin "L" Input Voltage
VIN=5.5V, VCE =5.5V/0V
VIN=5.5V, VCE =0V,
VOUT=5.5V/0V
VIN=5.5V
VIN=3.0V
VIN=3.0V
Topt=25°C
Min. Typ. Max. Unit
2.6
5.5
V
×0.980
×1.020 V
0.784
0.75
0.800
±150
1.00
0.816
1.25
V
ppm/
°C
MHz
70 140 190 µA
0.0 5.0 µA
−5.0 0.0 5.0 µA
0.20 0.35 Ω
0.20 0.35 Ω
100
%
0.5 1.0 1.4 ^ms
0.1 2.0 10.0 ms
1.0 1.4
A
2.10 2.25 2.40 V
2.20
VUVLO1
+0.10
2.50
V
−0.1 0.0 0.1 µA
−0.1 0.0
0.1
µA
1.5
V
0.3
V
0.3
V
5