R1232D151B-TR-FE [RICOH]
Switching Regulator;
| 型号： | R1232D151B-TR-FE |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Switching Regulator 开关 |
| 文件： | 总23页 (文件大小：1332K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
R1232D SERIES
PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
NO.EA-129-130510
OUTLINE
The R1232D Series are CMOS-based PWM step-down DC/DC converters with synchronous rectifier, low
supply current. As an output capacitor, a 10μF or more ceramic capacitor can be used with the R1232D.
Each of these ICs consists of an oscillator, a PWM control circuit, a voltage reference unit, an error amplifier, a
soft-start circuit, protection circuits, a protection against miss operation under low voltage (UVLO), a chip enable
circuit, a synchronous rectifier, Nch. driver transistor, and so on. A low ripple, high efficiency step-down DC/DC
converter can be easily composed of this IC with only a few kinds of external components, or an inductor and
capacitors. (As for R1232D001x type, divider resistors are also necessary.) In terms of the output voltage, it is
fixed internally in the R1232Dxx1x types. While in the R1232D001x types, the output voltage is adjustable with
external divider resistors.
As protection circuits, current limit circuit which limits peak current of LX at each clock cycle, and latch type
protection circuit exist. The latch protection works if the term of the over-current condition keeps on a certain time.
Latch-type protection circuit works to latch an internal driver with keeping it disable. To release the condition of
protection, after disable this IC with a chip enable circuit, enable it again, or restart this IC with power-on or make
the supply voltage at UVLO detector threshold level or lower than UVLO.
FEATURES
• Two choices of Oscillator Frequency............................1MHz, 2.25MHz
(Small inductors can be used. 4.7μH for 1MHz/2.2μH for 2.25MHz)
•
Built-in Driver ON Resistance .......................................P-channel 0.2Ω (at VIN=5.0V)
• Built-in Soft-start Function.............................................Typ. 1.0ms (fosc=1MHz type)
• Output Voltage ..............................................................0.9V to 3.3V (R1232Dxx1x Type)
0.8V to VIN (R1232D001x Type)
• High Accuracy Output Voltage ......................................±2.0%
• Built-in Current Limit Circuit ..........................................Typ. 1.4A
• Package ........................................................................SON-8 (t=0.9mm)
APPLICATIONS
• Power source for portable equipment such as PDA, DSC, Notebook PC.
• Power source for HDD
1
R1232D
BLOCK DIAGRAMS
R1232Dxx1A/B
VDD
AGND
3
7
V
IN
2
8
Slope
Compensation
Current Limit
5
4
V
OUT
Phase
Compensation
Q
R
Vref
S
PWM
Comparator
Output
Contorol
Error
Amplifer
L
X
CE
Oscillator
Soft Start
UVLO
“H” Active
TEST Circuit
Chip Enable
1
6
PGND
TEST GND Fixed
R1232D001C/D
V
DD
AGND
3
7
V
IN
2
8
Slope
Compensation
Current Limit
5
4
V
FB
Phase
Compensation
Q
R
Vref
S
PWM
Comparator
Output
Error
Amplifer
L
X
Contorol
CE
Oscillator
Soft Start
UVLO
“H” Active
TEST Circuit
Chip Enable
1
6
PGND
TEST GND Fixed
2
R1232D
SELECTION GUIDE
In the R1232D Series, the output voltage, the oscillator frequency and the output voltage adjustment for the
ICs can be selected at the user’s request.
Product Name
Package
Quantity per Reel
Pb Free
Halogen Free
SON-8
3,000 pcs
Yes
Yes
R1232Dxx1∗-TR-FE
xx: The output voltage can be designated in the range from 0.9 V(09) to 3.3V(33) in 0.1V steps.
(For externally adjustable output voltage type, (00).)
∗ : The oscillator frequency and the output voltage adjustment are options as follows.
Output voltage
adjustment
Code
Oscillator frequency
A
B
C
D
1MHz
2.25MHz
1MHz
No
No
Yes
Yes
2.25MHz
3
R1232D
PIN CONFIGURATION
SON-8
Top View
Bottom View
8
7
6
5
5
6
7
8
1
2
3
4
4
3
2
1
PIN DESCRIPTIONS
Pin No
Symbol
PGND
VIN
Pin Description
1
2
3
4
5
6
7
8
Ground Pin
Voltage Supply Pin
Voltage Supply Pin
VDD
CE
Chip Enable Pin (active with "H")
Output/Feedback Pin
VOUT/VFB
TEST
AGND
LX
Test Pin (Forced to the GND level.)
Ground Pin
LX Switching Pin (CMOS Output)
* Tab is GND level. (They are connected to the reverse side of this IC.) The tab is better to be connected to the GND, but
leaving it open is also acceptable.
4
R1232D
ABSOLUTE MAXIMUM RATINGS
（AGND=PGND=0V)
Symbol
VIN
Item
Rating
Unit
V
VIN Supply Voltage
VDD Pin Voltage
−0.3 to 6.5
VDD
V
−0.3 to 6.5
VLX
LX Pin Voltage
V
−0.3 to VIN + 0.3
−0.3 to VIN + 0.3
−0.3 to VIN + 0.3
−0.3 to VIN + 0.3
VCE
CE Pin Input Voltage
TEST Pin Input Voltage
V
VTEST
VOUT/VFB
ILX
V
VOUT/VFB Pin Input Voltage
LX Pin Output Current
V
V
±1.5
480
PD
Power Dissipation (SON-8)*
Operating Temperature Range
Storage Temperature Range
mW
°C
°C
Ta
−40 to 85
−55 to 125
Tstg
∗) For Power Dissipation, please refer to PACKAGE INFORMATION.
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the
permanent damages and may degrade the life time and safety for both device and system using the device
in the field. The functional operation at or over these absolute maximum ratings is not assured.
5
R1232D
ELECTRICAL CHARACTERISTICS
• R1232DxxxA/C
Ta=25°C
Unit
V
Symbol
Item
Conditions
Min.
Typ. Max.
VIN
Operating Input Voltage
2.6
5.5
VIN=VCE=5.0V, IOUT=10mA
Step-down Output Voltage
Feedback Voltage
V
OUT
×0.980
0.784 0.800 0.816
×1.020
V
V
VFB
ΔVOUT/ΔTa
fosc
R1232D001C
ppm/
°C
Step-down Output Voltage
Temperature Coefficient
−40°C Ta 85°C
±150
=
Oscillator Frequency
0.75
70
1.00
140
0.0
1.25
190
5.0
MHz
VIN=VCE =VSET +1.5V
VIN=VCE =5.5V,
VOUT(VFB)=5.5V
IDD
Supply Current
μA
μA
Istandby
Standby Current
LX Leakage Current
VCE=VOUT(VFB)=0V, VIN= 5.5V
VIN=5.5V,VCE=0V
VLX=5.5V or 0V
ILXleak
0.0
5.0
−5.0
μA
RONP
RONN
ON Resistance of Pch Transistor
ON Resistance of Nch Transistor
Oscillator Maximum Duty Cycle
Soft-start Time
0.20
0.20
0.35
0.35
VIN=5.0V, ILX=200mA
VIN=5.0V, ILX=200mA
Ω
Ω
Maxduty
tstart
100
0.5
%
ms
1.0
2.0
1.4
VIN=VCE =5.0V, at no load
VIN=VCE =5.0V
tprot
Protection Delay Time
0.1
10.0
ms
A
ILXlimit
VUVLO1
Lx Current Limit
1.0
1.4
VIN=VCE =5.0V
UVLO Detector Threshold
2.10
2.25
2.40
2.50
0.1
V
VIN=VCE =2.6V-> 1.5V
VUVLO1
+0.10
VUVLO2
UVLO Released Voltage
CE Input Current
2.20
−0.1
−0.1
1.5
V
VIN=VCE =1.5V-> 2.6V
μA
μA
ICE
0.0
VIN=5.5V, VCE =5.5V or 0V
IVOUT
（IVFB）
VIN=5.5V, VCE =0V,
VOUT(IVFB)=5.5V or 0V
VOUT/IVFB Leakage Current
0.0
0.1
VCEH
VCEL
CE "H" Input Voltage
CE "L" Input Voltage
V
V
VIN=5.5V
VIN=3.0V
0.3
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the
recommended operating conditions, even if when they are used over such conditions by momentary
electronic noise or surge. And the semiconductor devices may receive serious damage when they continue
to operate over the recommended operating conditions.
6
R1232D
• R1232DxxxB/D
Ta=25°C
Symbol
Item
Conditions
Min.
2.6
Typ. Max.
5.5
Unit
V
VIN
VOUT
VFB
Operating Input Voltage
Step-down Output Voltage
Feedback Voltage
V
VIN=VCE=5.0V,IOUT=10mA
×0.980
×1.020
R1232D001D
0.784 0.800 0.816
V
ppm/
°C
Step-down Output Voltage
Temperature Coefficient
ΔVOUT/ΔTa
fosc
−40°C Ta 85°C
±150
=
Oscillator Frequency
1.91
170
2.25
240
0.0
2.58
310
5.0
MHz
VIN=VCE=VSET+1.5V
VIN=VCE =5.5V,
VOUT(VFB)=5.5V
μA
IDD
Supply Current
μA
μA
Istandby
Standby Current
LX Leakage Current
VCE=VOUT(VFB)=0V, VIN= 5.5V
VIN=5.5V, VCE=0V,
VLX=5.5V or 0V
ILXleak
0.0
5.0
−5.0
RONP
RONN
ON Resistance of Pch Transistor
ON Resistance of Nch Transistor
Oscillator Maximum Duty Cycle
Soft-start Time
0.20
0.20
0.35
0.35
VIN=5.0V, ILX=200mA
VIN=5.0V, ILX=200mA
Ω
Ω
Maxduty
tstart
100
0.15
0.1
%
ms
0.4
2.0
0.7
VIN=VCE=5.0V, at no load
VIN=VCE=5.0V
tprot
Protection Delay Time
10.0
ms
A
ILXlimit
VUVLO1
LX Current Limit
1.0
1.4
VIN=VCE=5.0V
UVLO Detector Threshold
2.10
2.25
2.40
2.50
0.1
V
VIN=VCE=2.6V -> 1.5V
VUVLO1
+0.10
VUVLO2
UVLO Released Voltage
CE Input Current
2.20
−0.1
−0.1
1.5
V
VIN=VCE =1.5V -> 2.6V
VIN=5.5V, VCE =5.5V/0V
μA
μA
ICE
0.0
IVOUT
（IVFB）
VIN=5.5V, VCE =0V,
VOUT(IVFB)=5.5V or 0V
VOUT/IVFB Leakage Current
0.0
0.1
VCEH
VCEL
CE "H" Input Voltage
CE "L" Input Voltage
V
V
VIN=5.5V
VIN=3.0V
0.3
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the
recommended operating conditions, even if when they are used over such conditions by momentary
electronic noise or surge. And the semiconductor devices may receive serious damage when they continue
to operate over the recommended operating conditions.
7
R1232D
TEST CIRCUIT
VIN
Lx
VIN
Lx
CE
VDD
VDD
OSCILLOSCOPE
CE
VOUT /VFB
VOUT/VFB
AGND
PGND TEST
A
AGND
PGND TEST
Test Circuit for Input Current and Leakage Current
Test Circuit for Input Voltage and UVLO voltage
OSCILLOSCOPE
VOUT
VIN
Lx
CE
VDD
L
VOUT/VFB
AGND
PGND TEST
Test Circuit for Output Voltage, Oscillator Frequency, Soft-Starting Time
OSCILLOSCOPE
VIN
Lx
CE
VIN
Lx
CE
A
VDD
VDD
VOUT/VFB
VOUT /VFB
A
AGND
AGND
PGND TEST
PGND TEST
Test Circuit for Supply Current and Standby Current
Test Circuit for ON resistance of LX, Limit
Current, Delay Time of Protection Circuit
8
R1232D
TYPICAL APPLICATION AND TECHNICAL NOTES
• Fixed Output Voltage Type
L
VOUT
PGND
LX
C
IN
V
IN
AGND
TEST
LOAD
C
OUT
V
DD
V
OUT
CE
• Adjustable Output Type
L
VOUT
PGND
LX
C
IN
V
IN
AGND
TEST
LOAD
C
OUT
V
DD
Cb
R1
R2
V
FB
CE
CIN
10μF C2012JB0J106MT (TDK), 10μF CM21B106M06AB (Kyocera)
10μF C2012JB0J106MT (TDK), 10μF CM21B106M06AB (Kyocera)
COUT
4.7μH/2.7μH VLP5610-4R7MR90, VLP5610-2R7M1R0 (TDK)
*2.2μH is also suitable for B/D version.
L
In terms of setting R1, R2, Cb, refer to the technical notes.
9
R1232D
When you use these ICs, consider the following issues;
• Input the same voltage into power supply pins, VIN and VDD. Set the same level as AGND and PGND.
• When you control the CE pin by another power supply, do not make its "H" level more than the voltage level
of VIN / VDD pin.
• Set external components such as an inductor, CIN, COUT as close as possible to the IC, in particular,
minimize the wiring to VIN pin and PGND pin.
• At stand by mode, (CE="L"), the LX output is Hi-Z, or both P-channel transistor and N-channel transistor of
LX pin turn off.
• Set the "Test pin" to the GND. Do not make the test pin voltage as floating or other voltage.
• Reinforce the VIN, PGND, and VOUT lines sufficiently. Large switching current may flow in these lines. If the
impedance of VIN and PGND lines is too large, the internal voltage level in this IC may shift caused by the
switching current, and the operation might be unstable.
• Over current protection circuit supervises the inductor peak current (the current flowing Pch transistor) at all
each switching cycle, and if the current beyond the Lx current limit, Pch transistor is turned off. Further, if the
over current status continues equal or longer than protection delay time, or when the Lx limit current is
exceeded even once when the driver operates by duty 100%, Pch transistor is latched in the OFF state and
the operation of DC/DC converter stops.
The performance of power source circuits using these ICs extremely depends upon the peripheral circuits.
Pay attention in the selection of the peripheral circuits. In particular, design the peripheral circuits in a way that
the values such as voltage, current, and power of each component, PCB patterns and the IC do not exceed their
respected rated values.
10
R1232D
OPERATION of step-down DC/DC converter and Output Current
The step-down DC/DC converter charges energy in the inductor when LX transistor is ON, and discharges the
energy from the inductor when LX transistor is OFF and controls with less energy loss, so that a lower output
voltage than the input voltage is obtained. The operation will be explained with reference to the following
diagrams:
<Basic Circuits>
<Current through L>
IL
ILmax
i1
I
OUT
ILmin
topen
L
Lx Tr
SD
V
OUT
V
IN
i2
CL
ton
toff
T=1/fosc
Step 1:P-channel Tr. turns on and current IL (=i1) flows, and energy is charged into CL. At this moment,
IL increases from Ilmin (=0) to reach ILmax in proportion to the on-time period (ton) of P-channel Tr.
Step 2:When P-channel Tr. turns off, Synchronous rectifier N-channel Tr. turns on in order that L maintains IL at
ILmax, and current IL (=i2) flows.
Step 3:IL (=i2) decreases gradually and reaches IL=ILmin=0 after a time period of topen, and N-channel Tr.
Turns off. Provided that in the continuous mode, next cycle starts before IL becomes to 0 because toff
time is not enough. In this case, IL value increases from this Ilmin (>0).
In the case of PWM control system, the output voltage is maintained by controlling the on-time period (ton),
with the oscillator frequency (fosc) being maintained constant.
• Continuous Conduction Mode
The maximum value (ILmax) and the minimum value (ILmin) of the current flowing through the inductor are the
same as those when P-channel Tr. turns on and off.
The difference between ILmax and ILmin, which is represented by ΔI;
ΔI=ILmax−ILmin=VOUT×topen/L=(VIN−VOUT)×ton/L........................................................ Equation 1
Where,t=1/fosc=ton+toff
duty (%)=ton/t×100=ton×fosc×100
<
topen toff
=
In Equation 1, VOUT×topen/L and (VIN−VOUT) ×ton/L are respectively shown the change of the current at ON,
and the change of the current at OFF.
Even if the output current (IOUT) is, topen < toff as illustrated in the above diagram is not realized with this IC. At
least, topen is equal toff (topen=toff), and when IOUT is further increased, ILmin becomes larger than zero
(ILmin>0). The mode is referred to as the continuous mode.
11
R1232D
In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc
tonc=t×VOUT/VIN .............................................................................................................Equation 2
When the ton=tonc, the mode is the continuous mode.
OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS
When P-channel Tr. of LX is ON:
(Wherein, Ripple Current P-P value is described as IRP, ON resistance of P-channel Tr. and N-channel Tr. of LX
are respectively described as RONP and RONN, and the DC resistor of the inductor is described as RL.)
VIN=VOUT+(RONP+RL)×IOUT+L×IRP/ton...............................................................................Equation 3
When P-channel Tr. of LX is "OFF"(N-channel Tr. is "ON"):
L×IRP/toff=VF+VOUT+RONN×IOUT........................................................................................Equation 4
Put Equation 4 to Equation 3 and solve for ON duty of P-channel transistor, Don=ton/(toff+ton),
DON=(VOUT−RONN×IOUT+RL×IOUT)/(VIN+RONN×IOUT−RONP×IOUT)............................................Equation 5
Ripple Current is as follows;
IRP=(VIN−VOUT−RONP×IOUT−RL×IOUT)×DON/fosc/L...............................................................Equation 6
wherein, peak current that flows through L, and LX Tr. is as follows;
ILmax=IOUT+IRP/2...........................................................................................................Equation 7
Consider ILmax, condition of input and output and select external components.
ÌThe above explanation is directed to the calculation in an ideal case in continuous mode.
12
R1232D
How to Adjust Output Voltage and about Phase Compensation
As for Adjustable Output type, feedback pin (VFB) voltage is controlled to maintain 0.8V.
Output Voltage, VOUT is as following equation;
VOUT R1+R2=VFB:R2
VOUT=VFB×(R1+R2)/R2
Thus, with changing the value of R1 and R2, output voltage can be set in the specified range.
In the DC/DC converter, with the load current and external components such as L and C, phase might be
behind 180 degree. In this case, the phase margin of the system will be less and stability will be worse. To
prevent this, phase margin should be secured with proceeding the phase. A pole is formed with external
components L and COUT.
fpole ~1/2π LCOUT
A zero (signal back to zero) is formed with R1 and Cb.
≅fzero ~ 1/(2p×R1×Cb)
First, choose the appropriate value of R1, R2 and Cb.
Set R1+R2 value 100kΩ or less.
For example, if L=4.7μH, COUT =10μF, the cut off frequency of the pole is approximately 23kHz.
To make the cut off frequency of the zero by R1, R2, and Cb be higher than 23kHz,
set R1=33kΩ and Cb=100pF.If VOUT is set at 2.0V, R2=22kΩ is appropriate.
13
R1232D
External Components
1.Inductor
Select an inductor that peak current does not exceed ILmax. If larger current than allowable current flows,
magnetic saturation occurs and makes transform efficiency be worse.
Supposed that the load current is at the same, the smaller value of L is used, the larger the ripple current is.
Provided that the allowable current is large in that case and DC current is small, therefore, for large output
current, efficiency is better than using an inductor with a large value of L and vice versa.
2.Capacitor
As for CIN, use a capacitor with low ESR (Equivalent Series Resistance) Ceramic type of a capacity at least
10μF for stable operation.
COUT can reduce ripple of the output voltage, therefore as much as 10μF ceramic type is recommended.
TIMING CHART
Output
Short
Output Short
CE pin Voltage
Intemal Opertional Intemal Soft-start
Amplifier Output Set Voltage
Intemal Oscillator Waveform
Lx Pin Output
Latched
Delay Time of Protection
Soft-start Time
Stable
The timing chart as shown above describes the waveforms starting from the IC is enabled with CE and latched
with protection. During the soft-start time, until the level is rising up to the internal soft-start set voltage, the duty
cycle of LX is gradually wider and wider to prevent the over-shoot of the voltage. During the term, the output of
amplifier is "H". After the output voltage reaches the set output voltage, they are balanced well. Herein, if the
output pin would be short circuit, the output of amplifier would become "H" again, and the condition would
continue for 2.0ms (Typ.), or the Lx limit current is exceeded even once when the driver operates by duty 100%,
latch circuit would work and the output of LX would be latched with "OFF". (Output ="High-Z")
If the output short is released before the latch circuit works (within 2ms after output shorted), the output of
amplifier is balanced in the stable state again.
Once the IC is latched, to release the protection, input "L" with CE pin, or make the supply voltage at UVLO
level or less.
14
R1232D
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current (CIN = 10μF, COUT = 10μF)
R1232D121A
R1232D331A
V
IN=5.0V
VIN=5.0V
1.300
1.250
1.200
1.150
1.100
3.400
3.350
3.300
3.250
3.200
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
R1232D121B
R1232D331B
V
IN=5.0V
V
IN=5.0V
1.300
1.250
1.200
1.150
1.100
3.400
3.350
3.300
3.250
3.200
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
2) Efficiency vs. Output Current (CIN = 10μF, COUT = 10μF)
R1232D121A
R1232D331A
V
IN=3.3V, 5.0V
VIN=5.0V
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
(VIN=5.0V)
(VIN=3.3V)
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
15
R1232D
R1232D121B
R1232D331B
V
IN=3.3V, 5.0V
VIN=5.0V
100
100
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
(VIN=5.0V)
(VIN=3.3V)
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
3) Output Waveform
R1232D121A
R1232D331A
V
IN=5.0V, IOUT=600mA
VIN=5.0V, IOUT=600mA
0.04
0.03
0.02
0.01
0
0.04
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
-0.01
-0.02
-0.03
-0.04
-3
-2
-1
0
1
2
3
-3
-2
-1
0
1
2
3
Time t(ns)
Time t(ns)
R1232D121B
R1232D331B
V
IN=5.0V, IOUT=600mA
VIN=5.0V, IOUT=600mA
0.06
0.04
0.02
0
0.04
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
-0.02
-0.04
-0.06
-1.5 -1.0 -0.5
0
0.5
1.0
1.5
-1.5 -1.0 -0.5
0
0.5
1.0
1.5
Time t(ns)
Time t(ns)
16
R1232D
4) Load Transient Response
R1232D121A
R1232D121A
V
IN=5.0V
VIN=5.0V
0.8
0.6
0.4
0.5
0.4
0.3
0.2
0.1
0
0.8
0.6
0.4
0.2
0
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Output Current 10mA→600mA
Output Current 600mA→10mA
0.2
0
Output Voltage
-0.1
-0.2
-0.3
Output Voltage
-0.1
-50
0
50
100
150
200
-50
0
50
100
150
200
Time t (μs)
Time t (μs)
R1232D121B
R1232D121B
V
IN=5.0V
VIN=5.0V
0.8
0.6
0.4
0.2
0
0.5
0.4
0.3
0.2
0.1
0
0.8
0.6
0.4
0.2
0
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Output Current 10mA→600mA
Output Current 600mA→10mA
Output Voltage
-0.1
-0.2
-0.3
Output Voltage
-0.1
-50
0
50
100
150
200
-50
0
50
100
150
200
Time t (μs)
Time t (μs)
5) Output Voltage vs. Input Voltage
R1232D121A
R1232D331A
I
OUT=600mA
I
OUT=600mA
1.22
1.21
1.20
1.19
1.18
3.32
3.31
3.30
3.29
3.28
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage VIN(V)
Input Voltage VIN(V)
17
R1232D
6) Oscillator Frequency vs. Input Voltage
R1232D121A
R1232D121B
I
OUT=600mA
IOUT=600mA
1.10
1.05
1.00
0.95
0.90
2.4
2.3
2.2
2.1
2.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage VIN(V)
Input Voltage VIN(V)
7) Lx Transistor On Resistance vs. Input Voltage
Switching Tr. Pch on Resistance
Synchronous Rectifier Tr. Nch on Resistance
I
OUT=200mA
IOUT=200mA
0.14
0.13
0.12
0.11
0.10
0.09
0.14
0.13
0.12
0.11
0.10
0.09
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage VIN(V)
Input Voltage VIN(V)
8) Turn-on speed by CE pin
R1232D121A
R1232D121A
VIN=5.0V, L=4.7μH Rload=0Ω
VIN=5.0V, L=4.7μH Rload=12Ω
CE
CE
5V/div
5V/div
V
OUT
V
OUT
1V/div
1V/div
IL
IL
200mA/div
200mA/div
200μs/div
200μs/div
18
R1232D
R1232D331B
R1232D331B
VIN=5.0V, L=2.7μH Rload=0Ω
VIN=5.0V, L=2.7μH Rload=33Ω
CE
CE
5V/div
5V/div
VOUT
V
OUT
1V/div
1V/div
IL
IL
200mA/div
200mA/div
100μs/div
100μs/div
9) Output Voltage vs. Temperature
R1232D121A
R1232D331A
V
IN=5.0V
VIN=5.0V
1.24
1.22
1.20
1.18
1.16
1.14
3.40
3.35
3.30
3.25
3.20
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
10) Oscillator Frequency vs. Temperature
R1232D121A
R1232D331B
V
IN=5.0V
VIN=5.0V
1.30
1.20
1.10
1.00
0.90
0.80
0.70
2.50
2.40
2.30
2.20
2.10
2.00
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
19
R1232D
11) Supply Current vs. Temperature
R1232D121A
R1232D331B
V
IN=5.0V
VIN=5.0V
130
125
120
115
110
230
225
220
215
210
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
12) Soft-start time vs. Temperature
R1232D121A
R1232D331B
V
IN=5.0V, Rload=0Ω
VIN=5.0V, Rload=0Ω
1.3
1.1
0.9
0.7
0.5
0.60
0.55
0.50
0.45
0.40
0.35
0.30
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
13) UVLO Voltage vs. Temperature
R1232D121A
R1232D121A
2.40
2.50
2.40
2.30
2.20
2.30
2.20
2.10
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
20
R1232D
14) CE Input Voltage vs. Temperature
R1232D121A
R1232D121A
V
IN=5.0V, CE=H Threshold
VIN=5.0V, CE=L Threshold
1.5
1.3
1.0
0.8
0.5
1.5
1.3
1.0
0.8
0.5
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
15) TEST Input Voltage vs. Temperature
R1232D121A
VIN=5.0V
1.5
1.3
1.0
0.8
0.5
-40
-15
10
35
60
85
Temperature Topt(°C)
16) Lx Transistor On Resistance vs. Temperature
Driver Tr. Pch ON Resistance
Rectifier Tr.Nch ON Resistance
V
IN=5.0V
V
IN=5.0V
0.30
0.20
0.10
0.00
0.30
0.20
0.10
0.00
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
21
R1232D
17) Current Limit vs. Temperature
R1232D121A
R1232D331B
V
IN=5.0V
VIN=5.0V
-0.80
-1.05
-1.30
-1.55
-1.80
-0.80
-1.05
-1.30
-1.55
-1.80
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
18) Protection Delay Time vs. Temperatures
R1232D121A
R1232D331B
V
IN=5.0V
VIN=5.0V
10.0
7.5
5.0
2.5
0.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature Topt(°C)
Temperature Topt(°C)
22
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discontinuation of production without notice for reasons such as improvement. Therefore, before
deciding to use the products, please refer to Ricoh sales representatives for the latest
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without prior written consent of Ricoh.
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exporting or otherwise taking out of your country the products or the technical information
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4.The technical information described in this document shows typical characteristics of and
example application circuits for the products. The release of such information is not to be
construed as a warranty of or a grant of license under Ricoh's or any third party's intellectual
property rights or any other rights.
5.The products listed in this document are intended and designed for use as general electronic
components in standard applications (office equipment, telecommunication equipment,
measuring instruments, consumer electronic products, amusement equipment etc.). Those
customers intending to use a product in an application requiring extreme quality and reliability,
for example, in a highly specific application where the failure or misoperation of the product
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devices, life support system etc.) should first contact us.
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persons or damages to property resulting from such failure, customers should be careful enough
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damage arising from misuse or inappropriate use of the products.
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concerning the products or the technical information.
For the conservation of the global environment, Ricoh is advancing the decrease of the negative environmental impact material.
After Apr. 1, 2006, we will ship out the lead free products only. Thus, all products that will be shipped from now on comply with RoHS Directive.
Basically after Apr. 1, 2012, we will ship out the Power Management ICs of the Halogen Free products only. (Ricoh Halogen Free products are
also Antimony Free.)
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Electronic Devices Company
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RICOH COMPANY, LTD.
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