Part Name
         Description
R5212D

 Step-down DC/DC Converter with VR and Reset ( 26 Page)


RICOH
100% 
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 6 page
background image
R5212D
6
• R5212DxxxB
Topt
=25°C
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
VIN
Operating Input Voltage
3.0
5.5
V
IDD
Supply Current
VIN
=5.0V, VOUT1=0V
400
800
µA
VUVLO2
UVLO Release Voltage
2.35
2.50
2.65
V
VUVLOHYS
UVLO Detector Threshold
Voltage Hysteresis
0.05
0.15
0.25
V
• DC/DC Part
Topt
=25°C
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
VOUT1
DC/DC Output Voltage
VIN
=5.0V, at no load
OPEN LOOP
VOUT1
×0.98
VOUT1
×1.02
V
∆VOUT1/
∆Topt
DC/DC Output Voltage
Temperature Coefficient
40
°C <
= Topt <
= 85°C
±100
ppm
/
°C
fosc
Oscillator Frequency
VIN
=5.0V
960
1200
1440
kHz
RLX
Lx on Resistance
VIN
=5.0V, ILX=100mA
0.4
0.8
Ω
ILXleak
Lx Leakage Current
VIN
=VOUT1=5.5V, VLX=0V
0.01
5.00
µA
ILXLIM
Lx Current Limit
VIN
=5.0V
600
850
mA
Maxduty
Maximum duty cycle
100
%
tstart
Soft-start Time
VIN
=5.0V
0.35
1.00
3.00
ms
• VR Part
Topt
=25°C
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
VOUT2
VR Output Voltage
VIN
=5.0V, IOUT2=10mA
VOUT2
×0.98
VOUT2
×1.02
V
IOUT2
Maximum Output Current of VR VIN
=5.0V
200
mA
VREG2
VR Load Regulation
VIN
−VOUT2=0V
1mA <
= IOUT2 <
= 80mA
20
60
mV
VDIF2
Dropout Voltage
IOUT2
=100mA
0.2
0.3
V
ILIM2
Short Current Limit
VOUT2
=0V
50
mA
∆VOUT2/
∆Topt
VR Output Voltage
Temperature Coefficient
40
°C <
= Topt <
= 85°C
±100
ppm
/
°C
• VD Part
Topt
=25°C
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
−VDET
VD Detector Threshold
−VDET
×0.975
−VDET
×1.025
V
∆−VDET/
∆Topt
VD Detector Threshold
Temperature Coefficient
40
°C <
= Topt <
= 85°C
±100
ppm
/
°C
VHYS
Hysteresis Range
−VDET
×0.05
V
tPLH
VD Output Delay Time for
Release
VIN
=VDOUT=−VDET×0.9 to 5.0
3
12
30
ms
IDOUTL
VDOUT “L” Output Current
VIN
=2.0V, VDOUT=0.1V
2
7
20
mA
1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26 



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