R1221N47AE-TR [RICOH]
Voltage-Mode SMPS Controller ; 电压型开关电源控制器\n
| 型号： | R1221N47AE-TR |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Voltage-Mode SMPS Controller
|
| 文件： | 总21页 (文件大小：220K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
99.12.8
‘
Step-down DC/DC Converter with Voltage Detector
12345
R1221N Series
n OUTLINE
The R1221N Series are PWM step-down DC/DC Converter controllers embedded with a voltage detector, with
low supply current by CMOS process.
Each step-down DC/DC converter in these ICs consists of an oscillator, a PWM control circuit, a reference
voltage unit, an error amplifier, a soft-start circuit, a protection circuit, a PWM/VFM alternative circuit, a chip
enable circuit, and resistors for voltage detection. A low ripple, high efficiency step-down DC/DC converter can be
composed of this IC with only four external components, or a power-transistor, an inductor, a diode and a
capacitor.
The output voltage of DC/DC converter can be supervised by the built-in voltage detector.
With a PWM/VFM alternative circuit, when the load current is small, the operation turns into the VFM oscillator
from PWM oscillator automatically, therefore the efficiency at small load current is improved.
And the PWM/VFM alternative circuit is an option, in terms of C version and D version, the circuit is not included.
If the term of maximum duty cycle keeps on a certain time, the embedded protection circuit works. There are two
types of protection function. One is latch-type protection circuit, and it works to latch an external Power MOS 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. The other is Reset-type protection circuit, and it works to restart the
operation with soft-start and repeat this operation until maximum duty cycle condition is released. Either of these
protection circuits can be designated by users’ request.
n FEATURES
l Wide Range of Input Voltage · · · · · · · · · · · · · 2.3V to 13.2V
l Built-in Soft-start Function and two choices of Protection Function(Latch-type or Reset-type)
l Two choices of Oscillator Frequency · · · · · · · · · · 300kHz, 500kHz
l High Efficiency · · · · · · · · · · · · · · · · · · · · · · TYP. 90%
l Standby Current · · · · · · · · · · · · · · · · · · · · · TYP. 0µA
l Setting Output Voltage · · · · · · · · · · · · · · · · · Stepwise setting with a step of 0.1V in the range of
1.5V to 5.0V
l High Accuracy Output Voltage · · · · · · · · · · · · · · ±2.0%
l Setting Detector Threshold Voltage · · · · · · · · · · · Stepwise setting with a step of 0.1V in the range of
1.2V to 4.5V
l High Accuracy Detector Threshold Voltage· · · · · · · ±2.0%
l Low Temperature-Drift Coefficient of Output Voltage · TYP. ±100ppm/°C
n APPLICATIONS
l Power source for hand-held communication equipment, cameras, video instruments such as VCRs,
camcorders.
l Power source for battery-powered equipment.
l Power source for household electrical appliances.
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Rev. 1.11
- 1 -
n BLOCK DIAGRAM
OSC
VOUT
VIN
Vref
EXT
Protection
PWM/VFM
CONTROL
CE
Soft Start
Chip Enable
Vref
VDOUT
GND
n SELECTION GUIDE
In the R1221N Series, the output voltage, the detector threshold, the oscillator frequency, the optional
function, and the taping type for the ICs can be selected at the user’s request.
The selection can be made by designating the part number as shown below;
R1221NXXXX-TR
• • •
a b c
Code
Contents
a
Setting Output Voltage(VOUT):
Stepwise setting with a step of 0.1V in the range of 1.5V to 5.0V is possible.
Setting Detector Threshold(-VDET)
b
Stepwise setting with a step of 0.1V in the range of 1.2V to 4.5V is possible.
A:3.0V
c
Designation of Oscillator Frequency and Optional Function
A:300kHz, with a PWM/VFM alternative circuit, Latch-type protection
B:500kHz, with a PWM/VFM alternative circuit, Latch-type protection
C:300kHz, without a PWM/VFM alternative circuit, Latch-type protection
D:500kHz, without a PWM/VFM alternative circuit, Latch-type protection
E:300kHz, with a PWM/VFM alternative circuit, Reset-type protection
F:500kHz, with a PWM/VFM alternative circuit, Reset-type protection
G:300kHz, without a PWM/VFM alternative circuit, Reset-type protection
H:500kHz, without a PWM/VFM alternative circuit, Reset-type protection
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Rev. 1.11
- 2 -
n PIN CONFIGURATION
l SOT-23-6W
5
6
4
VOUT GND CE
(mark side)
OUT
EXT VD
IN
V
3
1
2
n PIN DESCRIPTION
Pin No.
Symbol
EXT
Description
1
2
3
4
5
6
External Transistor Drive Pin (Output Type ; CMOS)
Voltage Detector Output Pin (Output Type ; Nch Open Drain )
Power Supply Pin
VD
OUT
V
IN
CE
Chip Enable Pin
GND
Ground Pin
V
OUT
Pin for Monitoring Output Voltage
n ABSOLUTE MAXIMUM RATING
Symbol
Item
Supply Voltage
Rating
15
Unit
V
V
IN
V
IN
V
EXT Pin Output Voltage
CE Pin Input Voltage
-0.3~V +0.3
V
EXT
IN
V
-0.3~V +0.3
V
CE
IN
VD
V
VD
V
Pin Output Voltage
OUT
-0.3~15
V
OUT
Pin Input Voltage
-0.3~V +0.3
V
OUT
EXT
OUT
IN
I
EXT Pin Inductor Drive Output Current
Power Dissipation
±25
250
mA
mW
°C
°C
P
D
Topt
Tstg
Operating Temperature Range
Storage Temperature Range
-40~+85
-55~+125
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Rev. 1.11
- 3 -
n ELECTRICAL CHARACTERISTICS
lR1221N***A(C,E,G) Output Voltage : Vo, Detector Threshold : VD
(Topt=25°C)
Symbol
Item
Conditions
MIN. TYP. MAX.
Unit
V
Note*
V
IN
Operating Input Voltage
Step-down Output Voltage
2.3
Vo´
0.98
13.2
Vo´
1.02
V
OUT
V =V =Vo+1.2V, I
=-10mA
Vo
A
V
IN
CE
OUT
DV
/
Step-down Output Voltage
Temperature Coefficient
Oscillator Frequency
Frequency Temperature
Coefficient
-40°C £ Topt £ 85°C
±100
ppm/
°C
OUT
DT
fosc
V =V =Vo+1.2V, I =-100mA
OUT
240 300 360
A
kHz
%/
°C
IN
CE
Df
/
-40°C £ Topt £ 85°C
±0.3
OSC
DT
I
Supply Current1
V =13.2V,V =13.2V,V =13.2V
OUT
100 160
B
C
D
D
E
E
F
mA
mA
mA
mA
mA
mA
V
DD1
IN
CE
I
Standby Current
V =13.2V,V =0V,V =0V
OUT
0
-10
20
0
0.5
-6
stb
IN
CE
I
EXT "H" Output Current
EXT "L" Output Current
CE "H" Input Current
CE "L" Input Current
CE "H" Input Voltage
CE "L" Input Voltage
V =8V,V
=7.9V,V
=0.1V,V
=8V,V =8V
CE
EXTH
IN
EXT
OUT
I
V =8V,V
=0V,V =0V
10
EXTL
IN
EXT
OUT
CE
I
V =13.2V,V =13.2V,V
=13.2V
0.5
1.2
CEH
IN
CE
OUT
I
V =13.2V,V =0V,V =13.2V
OUT
-0.5
0
CEL
IN
CE
V
V =8V,V =0V®1.5V
0.8
0.8
CEH
IN
CE
V
V =8V,V =1.5V®0V
0.3
F
V
CEL
IN
CE
Maxdty Oscillator Maximum Duty Cycle
VFMdty VFM Duty Cycle
100
%
Applied to B and F versions only
25
10
%
T
Delay Time by Soft-Start
function
V =Vo+1.2V,V =0V®Vo+1.2V
5
1
16
F
ms
start
IN
CE
At 80% of rising
T
Delay Time for protection circuit V =Vo+1.2V,V =Vo+1.2V®0V
3
0
1
5
G
I
ms
mA
mA
V
prot
IN
CE
I
VD
VD
Output Leakage Current V =V
=V =V =8V
DOUT
0.5
VDLK
OUT
OUT
IN
OUT
CE
I
“L” Output Current
V =V
=2.3V, V =0V, V =0.1V 0.5
DOUT
I
VDL
IN
OUT
CE
-V
tV
V
Detector Threshold
V =6V, V =6V, V
=V ´1.2V®0V V ´
V
D
V ´
D
J
DET
IN
CE
OUT
OUT
OUT
D
D
0.98
2
1.02
10
Output Delay Time for Released V =6V, V =6V, V
=0V®V ´1.2V
5
J
J
ms
DET
IN
CE
D
Voltage
At 80% of rising
Detector Threshold Hysteresis V =6V, V =6V, V
=0V®V ´1.2V V ´ V ´ V ´
mV
HYS
IN
CE
D
D
D
D
0.01 0.03 0.05
D-V
/
Detector Threshold
-40°C £ Topt £ 85°C
±100
ppm/
DET
DT
Temperature Coefficient
°C
Note: Refer to Test Circuits
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Rev. 1.11
- 4 -
lR1221N***B(D,F,H) Output Voltage : Vo, Detector Threshold : VD
(Topt=25°C)
Symbol
Item
Conditions
MIN. TYP. MAX.
Unit
V
Note*
V
IN
Operating Input Voltage
Step-down Output Voltage
2.3
Vo´
0.98
13.2
Vo´
1.02
V
OUT
V =V =Vo+1.2V, I
=-10mA
Vo
A
V
IN
CE
OUT
DV
/
Step-down Output Voltage
Temperature Coefficient
Oscillator Frequency
Frequency Temperature
Coefficient
-40°C £ Topt £ 85°C
±100
ppm/
°C
OUT
DT
fosc
V =V =Vo+1.2V, I =-100mA
OUT
400 500 600
A
kHz
%/
°C
IN
CE
Df
/
-40°C £ Topt £ 85°C
±0.3
OSC
DT
I
Supply Current1
V =13.2V,V =13.2V,V =13.2V
OUT
140 200
B
C
D
D
E
E
F
mA
mA
mA
mA
mA
mA
V
DD1
IN
CE
I
Standby Current
V =13.2V,V =0V,V =0V
OUT
0
-10
20
0
0.5
-6
stb
IN
CE
I
EXT "H" Output Current
EXT "L" Output Current
CE "H" Input Current
CE "L" Input Current
CE "H" Input Voltage
CE "L" Input Voltage
V =8V,V
=7.9V,V
=0.1V,V
=8V,V =8V
CE
EXTH
IN
EXT
OUT
I
V =8V,V
=0V,V =0V
10
EXTL
IN
EXT
OUT
CE
I
V =13.2V,V =13.2V,V
=13.2V
0.5
1.2
CEH
IN
CE
OUT
I
V =13.2V,V =0V,V =13.2V
OUT
-0.5
0
CEL
IN
CE
V
V =8V,V =0V®1.5V
0.8
0.8
CEH
IN
CE
V
V =8V,V =1.5V®0V
0.3
F
V
CEL
IN
CE
Maxdty Oscillator Maximum Duty Cycle
VFMdty VFM Duty Cycle
100
%
Applied to B and F versions only
25
6
%
T
Delay Time by Soft-Start
function
V =Vo+1.2V,V =0V®Vo+1.2V
3
1
10
F
ms
start
IN
CE
At 80% of rising
T
Delay Time for protection circuit V =Vo+1.2V,V =Vo+1.2V®0V
2
0
1
4
G
I
ms
mA
mA
V
prot
IN
CE
I
VD
VD
Output Leakage Current V =V
=V =V =8V
DOUT
0.5
VDLK
OUT
OUT
IN
OUT
CE
I
“L” Output Current
V =V
=2.3V,V =0V, V =0.1V 0.5
DOUT
I
VDL
IN
OUT
CE
-V
tV
V
Detector Threshold
V =6V, V =6V, V
=V ´1.2V®0V V ´
V
D
V ´
D
J
DET
IN
CE
OUT
OUT
OUT
D
D
0.98
1.02
6.0
Output Delay Time for Released V =6V, V =6V, V
=0V®V ´1.2V 1.5
3.5
J
J
ms
DET
IN
CE
D
Voltage
At 80% of rising
Detector Threshold Hysteresis V =6V, V =6V, V
=0V®V ´1.2V V ´ V ´ V ´
mV
HYS
IN
CE
D
D
D
D
0.01 0.03 0.05
D-V
/
Detector Threshold
-40°C £ Topt £ 85°C
±100
ppm/
DET
DT
Temperature Coefficient
°C
Note: Refer to Test Circuits
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Rev. 1.11
- 5 -
n TEST CIRCUITS
A)
F)
L
PMOS
L
PMOS
+
-
+
3
4
1
2
6
5
V
--
SD
CL
+
+
-
3
4
6
5
1
2
VIN
V
-CIN
SD
CIN
C
L
IN
V
OSCILLOSCOPE
B)
A
3
4
1
2
6
5
OSCILLOSCOPE
G)
+
VIN
-
OSCILLOSCOPE
3
4
1
2
6
5
IN
A
C
OUT
V
VIN
C)
3
1
6
H)
VIN
3
4
1
2
6
5
A
2
4
5
OUT
V
VIN
A
D)
VEXT
I)
3
4
1
2
6
5
3
4
1
2
6
5
VIN
VIN
OUT
V
VDOUT
E)
A
J)
3
4
1
2
6
3
4
1
2
6
5
VIN
VOUT
IN
V
A
5
R
OSCILLOSCOPE
Inductor L : 27mH(Sumida Electronic, CD104)
Capacitor CL: 47mF(Tantalum type)
Power MOS PMOS : HAT1020R(Hitachi)
Diode SD : RB491D (Rohm, Schottky type)
CIN : 22mF(Tantalum type)
Resistor R : 100kW
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Rev. 1.11
- 6 -
n TYPICAL APPLICATIONS AND APPLICATION HINTS
PMOS
L
EXT
VIN
Vcc
OUT
V
R1
COUT
SD1
CIN
CE
VDOUT
Reset/
GND
CE CONTROL
CPU
PMOS: HAT1020R (Hitachi), Si3443DV (Siliconix)
SD1 : RB491D (Rohm)
L : CD105(Sumida, 27mH)
COUT : 47mF(Tantalum Type)
R1 : 100kW
CIN
:10mF(Tantalum Type)
When you use these ICs, consider the following issues;
l As shown in the block diagram, a parasitic diode is formed in each terminal, each of these diodes is not formed
for load current, therefore do not use it in such a way. When you control the CE pin by another power supply,
do not make its "H" level more than the voltage level of VIN pin.
l Detector threshold hysteresis is set at 3 percent of detector threshold voltage. (Min. 1 percent, Max. 5 percent)
l Setting Detector threshold voltage range depends on Output voltage of DC/DC converter.
Release Voltage from Reset condition must not be more than Output voltage of DC/DC converter.
(Detector Threshold Voltage´1.07 < Output Voltage of DC/DC converter´0.98
l When the R1221NXXXX is on stand-by mode, the output voltage of VDOUT is GND level, therefore if the pull-up
resistor for VDOUT pin is pulled up another power supply, a certain amount of current is loading through the
resistor.
l The operation of Latch-type protection circuit is as follows;
When the maximum duty cycle continues longer than the delay time for protection circuit, (Refer to the Electrical
Characteristics) the protection circuit works to shut-down the external Power MOS with its latching operation.
Therefore when an input/output voltage difference is small, the protection circuit may work even at small load
current.
To release the protection state, after disable this IC with a chip enable circuit, enable it again, or restart this IC
with power-on. However, in the case of restarting this IC with power-on, after the power supply is turned off, if
a certain amount of charge remains in C , or some voltage is forced to V from C , this IC might not be
IN
IN
IN
restarted even after power-on.
If rising transition speed of supply voltage is too slow, or the time which is required for V voltage to reach
IN
Output Voltage of DC/DC converter is longer than soft-starting time plus delay time for protection circuit,
protection circuit works before V voltage reaches Output Voltage of DC/DC converter. To avoid this condition,
IN
make this IC disable(CE=”L”) first, then force V voltage, and after V voltage becomes equal or more than
IN
IN
V
OUT
, make this IC enable(CE=“H”).
l
Set external components as close as possible to the IC and minimize the connection between the components
and the IC. In particular, a capacitor should be connected to VOUT pin with the minimum connection. And make
sufficient grounding and reinforce supplying. A large switching current flows through the connection of power
supply, an inductor and the connection of VOUT. If the impedance of power supply line is high, the voltage level of
power supply of the IC fluctuates with the switching current. This may cause unstable operation of the IC.
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Rev. 1.11
- 7 -
l Use capacitors with a capacity of 22mF or more for VOUT Pin, and with good high frequency characteristics such
as tantalum capacitors. We recommend you to use capacitors with an allowable voltage which is at least twice as
much as setting output voltage. This is because there may be a case where a spike-shaped high voltage is
generated by an inductor when an external transistor is on and off.
l Choose an inductor that has sufficiently small D.C. resistance and large allowable current and is hard to reach
magnetic saturation. And if the value of inductance of an inductor is extremely small, the ILX may exceed the
absolute maximum rating at the maximum loading.
Use an inductor with appropriate inductance.
l Use a diode of a Schottky type with high switching speed, and also pay attention to its current capacity.
l Do not use this IC under the condition at VIN voltage less than minimum operating voltage.
P 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.
n 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 Circuit>
<Current through L>
i1
ILmax
IOUT
ILmin
topen
L
VIN
Lx Tr
SD
VOUT
i2
CL
ton
toff
T=1/fosc
Step 1 : LxTr 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 LXTr.
Step 2 : When LxTr turns off, Schottky diode(SD) turns on in order that L maintains IL at ILmax, and current IL(=i2)
flows.
Step 3 : IL decreases gradually and reaches ILmin after a time period of topen, and SD 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 is from this ILmin(>0).
In the case of PWM control system, the output voltage is maintained by controlling the on-time period(ton), sith the
oscillator frequency(fosc) being maintained constant.
l Discontinuous Conduction Mode and Continuous Conduction Mode
The maximum value(ILmax) and the minimum value(ILmin) of the current which flows through the inductor are the
same as those when LxTr is ON and when it is OFF.
The difference between ILmax and ILmin, which is represented by DI ;
DI =ILmax –ILmin =VOUT´topen/L=(VIN-VOUT)´ton/L×××Equation 1
wherein T=1/fosc=ton+toff
duty(%)=ton/T´100=ton´fosc´100
topen£toff
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Rev. 1.11
- 8 -
In Equation 1, VOUT´topen/L and (VIN-VOUT)´ton/L are respectively show the change of the current at ON, and the
change of the current at OFF.
When the output current(IOUT) is relatively small, topen<toff as illustrated in the above diagram. In this case, the
energy is charged in the inductor during the time period of ton and is discharged in its entirely during the time period
of toff, therefore ILmin becomes to zero(ILmin=0). When Iout is gradually increased, eventually, topen becomes to
toff (topen = toff), and when IOUT is further increased, ILmin becomes larger than zero(ILmin>0). The former mode
is
referred to as the discontinuous mode and the latter mode is referred to as continuous mode.
In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc,
tonc =T´VIN/VOUT××× Equation 2
When ton<tonc, the mode is the discontinuous mode, and when ton = tonc, the mode is the continuous mode.
n OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS
When LxTr is ON:
(Wherein, Ripple Current P-P value is described as IRP, ON resistance of LXTr is described as Rp the direct current
of the inductor is described as RL.)
VIN=VOUT+(Rp +RL)´IOUT+L´IRP/ton
×××Equation 3
When LxTr is OFF:
L´IRP/ toff =VF+VOUT+RL´IOUT
×××Equation 4
Put Equation 4 to Equation 3 and solve for ON duty, ton/(toff+ton)=DON,
DON=(VOUT+VF+RL´IOUT)/(VIN+VF-Rp´IOUT)×××Equation 5
Ripple Current is as follows;
IRP=(VIN-VOUT-Rp´IOUT-RL´IOUT)´DON/f/L ¼Equation 6
wherein, peak current that flows through L, LxTr, and SD is as follows;
ILmax=IOUT+IRP/2
¼Equation 7
Consider ILmax, condition of input and output and select external components.
HThe above explanation is directed to the calculation in an ideal case in continuous mode.
n 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 make transform efficiency worse.
When the load current is same, the smaller value of L, the larger the ripple current.
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. Diode
Use a diode with low VF (Schottky type is recommended.) and high switching speed.
Reverse voltage rating should be more than VIN and current rating should be equal or more than ILmax.
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Rev. 1.11
- 9 -
3. Capacitor
As for CIN, use a capacitor with low ESR(Equivalent Series Resistance) and a capacity of at least 10mF for stable
operation.
COUT can reduce ripple of Output Voltage, therefore 47mF to 100mF tantalum type is recommended.
4. Lx Transistor
Pch Power MOS FET is required for this IC.
Its breakdown voltage between gate and source should be a few volt higher than Input Voltage.
In the case of Input Voltage is low, to turn on MOS FET completely, select a MOS FET with low threshold voltage.
If a large load current is necessary for your application and important, choose a MOS FET with low ON resistance
for good efficiency.
If a small load current is mainly necessary for your application, choose a MOS FET with low gate capacity for good
efficiency.
Maximum continuous drain current of MOS FET should be larger than peak current, ILmax.
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Rev. 1.11
- 10 -
n TYPICAL CHARACTERISTCS
1) Output Voltage vs. Output Current
L=27uH
L=27uH
R1221N33AH
R1221N15XH
3.400
1.520
1.515
1.510
1.505
1.500
1.495
1.490
1.485
1.480
3.380
3.360
3.340
3.320
3.300
3.280
3.260
3.240
3.220
3.200
13.2V
12V
8V
8V
5V
4.5V
2.3V
1E-05 0.0001 0.001 0.01
0.1
1
1E-05 0.0001 0.001 0.01
0.1
IOUT(A)
1
Output Current
IOUT(A)
Output Current
2) Efficiency vs. Output Current
CD104-27uH
Si3443DV
(VIN=12V)CD104-27uH
(VIN=4.5V)
R1221N33AA
R1221N33AA
Si3443DV
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
0.1
1
10
100
(mA)
1000
0.1
1
10
100
IOUT(mA)
1000
Output Current OUT
I
Output Current
(VIN=4.5V) CD104-27uH
(VIN=12V)CD104-27uH
R1221N33AC
R1221N33AB
Si3443DV
Si3443DV
100
80
60
40
20
0
100
80
60
40
20
0
0.1
1
10
100
IOUT(mA)
1000
0.1
1
10
100
(mA)
1000
Output Current
Output Current IOUT
12345
Rev. 1.11
- 11 -
R1221N33AC
(VIN=12V)CD104-27uH
R1221N33AC
CD104-27uH
Si3443DV
(VIN=4.5V)
Si3443DV
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
0.1
1
10
100
(mA)
1000
Output Current IOUT(mA)
Output Current
OUT
I
(VIN=6.0V) CD104-27uH
CD104-27uH
Si3443DV
R1221N50XA
R1221N50XA
(VIN=12V)
Si3443DV
100
100
80
60
40
20
0
80
60
40
20
0
0.1
1
10
100
1000
0.1
1
10
100
IOUT(mA)
1000
Output Current
Output Current IOUT(mA)
CD104-27uH
Si3443DV
CD104-27uH
(VIN=12V)
Si3443DV
R1221N50XB
(VIN=6.0V)
R1221N50XB
100
80
60
40
20
0
100
80
60
40
20
0
0.1
1
10
100
1000
Output Current IOUT(mA)
0.1
1
10
100
1000
Output Current IOUT(mA)
12345
Rev. 1.11
- 12 -
(VIN=6.0V)CD104-27uH
(VIN=12V) CD104-27uH
R1221N50XC
R1221N50XC
Si3443DV
Si3443DV
100
80
60
40
20
0
100
80
60
40
20
0
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current IOUT(mA)
Output Current
OUT
I
(mA)
3) Ripple Voltage vs. Output Current
L=27uH
C=47uF(Ta)
L=27uH
C=47uF(Ta)
R1221N33AA
R1221N50XA
200
180
160
140
120
100
80
200
180
160
140
120
100
80
VIN4.5V
VIN8V
VIN6V
VIN8V
VIN12V
VIN12V
60
60
40
40
20
20
0
0
1
10
100
1000
1
10
100
1000
Output Current IOUT(mA)
Output Current IOUT(mA)
L=27uH
C=47uF(Ta)
L=27uH
C=47uF(Ta)
R1221N33AB
R1221N50XB
200
180
160
140
120
100
80
200
180
160
140
120
100
80
VIN6V
VIN4.5V
VIN8V
VIN8V
VIN12V
VIN12V
60
60
40
40
20
20
0
0
1
10
Output Current
100
1000
1
10
Output Current
100
IOUT(mA)
1000
OUT
I
(mA)
12345
Rev. 1.11
- 13 -
L=27uH
C=47uF(Ta)
L=27uH
C=47uF(Ta)
R1221N33AC
R1221N50XC
200
180
160
140
120
100
80
200
180
160
140
120
100
80
VIN6V
VIN4.5V
VIN8V
VIN8V
VIN12V
VIN12V
60
60
40
40
20
20
0
0
1
10
Output Current
100
IOUT(mA)
1000
1
10
Output Current
100
IOUT(mA)
1000
4) Oscillator Frequency vs. Input Voltage
L=27uH
L=27uH
R1221N15XB
R1221N15XA
600
500
400
300
200
100
0
600
500
400
300
200
100
0
0
5
10
VIN(V)
15
0
5
10
15
Input Voltage
Input Voltage VIN(V)
5) Output Voltage vs. Input Voltage
L=27uH
L=27uH
R1221N15XB
R1221N15XA
1.53
1.53
1.52
1.51
1.50
1.49
1.48
1.47
1.52
1.51
1.50
1.49
1.48
1.47
0
5
10
15
0
5
10
15
Input Voltage VIN(V)
Input Voltage VIN(V)
12345
Rev. 1.11
- 14 -
L=27uH
L=27uH
R1221N33AA
R1221N33AB
3.36
3.34
3.32
3.30
3.28
3.26
3.24
3.36
3.34
3.32
3.30
3.28
3.26
3.24
0
5
10
IN
V (V)
15
0
5
10
15
Input Voltage VIN(V)
Input Voltage
6) Output Voltage vs. Temperature
L=27uH
L=27uH
R1221N15XB
R1221N33AH
3.31
1.51
3.30
3.29
3.28
3.27
1.50
1.49
1.48
1.47
-50
0
50
100
-50
0
50
100
Temperature Topt
(°C)
(°C)
Temperature Topt
7) Detector Threshold vs. Temperature
VIN=6V
VIN=6V
(VD=2.0V)
R1221N25XA
(VD=1.2V)
R1221N15XB
1.22
2.01
2.00
1.99
1.98
1.97
1.21
1.20
1.19
1.18
-50
0
50
100
-50
0
50
100
Temperature Topt
(°C)
Temperature Topt(°C)
12345
Rev. 1.11
- 15 -
VIN=6V
(VD=3.0V)
R1221N33AB
3.06
3.04
3.02
3.00
2.98
2.96
2.94
-50
0
50
100
Temperature Topt
(°C)
8) Oscillator Frequency vs. Temperature
L=27uH
VIN=4.5V
L=27uH
VIN=3.7V
R1221N33AB
R1221N25XA
600
550
500
450
400
360
340
320
300
280
260
240
-50
0
50
100
-50
0
50
100
Temperature Topt
(°C)
°C)
Temperature Topt(
9) Supply Current vs. Temperature
R1221N33AH
R1221N33AG
100
90
80
70
60
50
135
130
125
120
115
110
105
100
95
VIN15V
VIN13.2V
VIN8V
VIN15V
VIN13.2V
VIN8V
90
-50
0
50
100
-50
0
50
100
(°C)
Temperature Topt
(°C)
Temperature Topt
12345
Rev. 1.11
- 16 -
10) Soft-start Time vs. Temperature
R1221N33AB
L=27uH
VIN=4.5V
L=27uH
VIN=3.7V
R1221N25XA
12
10
8
10
8
6
4
6
2
4
0
2
-50
0
50
100
-50
0
50
100
°C)
Temperature Topt(
Temperature Topt
(°C)
11) Delay Time for Latch-type Protection vs. Temperature
VIN=4.5V
R1221N33AB
R1221N25XA
VIN=3.7V
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-50
0
50
100
-50
0
50
100
(°C)
Temperature Topt
Temperature Topt
(°C)
12) Delay Time for Reset-type Protection vs. Temperature
VIN=4.5V
VIN=4.5V
R1221N33AH
R1221N33AG
5
5
4
3
2
1
0
4
3
2
1
0
-50
0
50
100
-50
0
50
100
(°C)
Temperature Topt
(°C)
Temperature Topt
12345
Rev. 1.11
- 17 -
13) VD Output Delay Time vs. Temperature
VIN=8.0V
VIN=8.0V
R1221N33AB
R1221N25XA
6
5
4
3
2
1
0
6
5
4
3
2
1
0
-50
0
50
100
-50
0
50
100
Temperature Topt
(°C)
(°C)
Temperature Topt
14) EXT”H” Output Current vs. Temperature
R1221N33AB
16
14
12
10
8
6
4
2
0
-50
0
50
100
Temperature Topt
(°C)
15) EXT ”L” Output Current vs. Temperature
R1221N33AB
30
25
20
15
10
5
0
-50
0
50
(°C)
100
Temperature Topt
12345
Rev. 1.11
- 18 -
16) VDOUT “L” Output Current vs. Temperature
R1221N33AD
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-50
0
50
100
Temperature Top(t°C)
17) Load Transient Response
R1221N33AA
VIN=5V
L=27uH
VIN=5V
L=27uH
R1221N33AA
3.6
3.5
3.4
3.3
3.2
3.1
3
3.4
3.3
3.2
3.1
3
2.9
2.8
2.7
2.6
2.5
2.4
500
500
2.9
2.8
2.7
2.6
0.1
0.1
0.1
0.001
0
0.05
0
0.0005
Time (sec)
Time (sec)
VIN=5V
L=27uH
VIN=5V
L=27uH
R1221N33AB
R1221N33AB
3.4
3.3
3.2
3.1
3
3.6
3.5
3.4
3.3
3.2
3.1
3
2.9
2.8
2.7
2.6
2.5
2.4
500
500
2.9
2.8
2.7
2.6
0.1
0.001
0.1
0.1
0
0.05
0
0.0005
Time (sec)
Time (sec)
12345
Rev. 1.11
- 19 -
VIN=5V
L=27uH
VIN=5V
L=27uH
R1221N33AC
R1221N33AC
3.6
3.5
3.4
3.3
3.2
3.1
3
3.4
3.3
3.2
3.1
3
2.9
2.8
2.7
2.6
2.5
2.4
500
0.1
500
2.9
2.8
2.7
2.6
0.1
0.001
0
0.0005
0
0.05
0.1
Time (sec)
Time (sec)
VIN=5V
L=27uH
VIN=5V
L=27uH
R1221N33AD
R1221N33AD
3.4
3.6
3.5
3.4
3.3
3.2
3.1
3
2.9
2.8
2.7
2.6
3.3
3.2
3.1
3
2.9
2.8
2.7
2.6
2.5
2.4
500
500
0.1
0.001
0.1
0.1
0
0.05
0
0.0005
Time (sec)
Time (sec)
18) Turn-on Waveform
L=27uH
L=27uH
R1221N33AA IN
(V =10V,I
OUT
R1221N33AA IN
(V =5V,IOUT=0mA)
=0mA)
3.5
3
2.5
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
-2.5
-3
-3.5
3.5
3
2.5
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
-2.5
-3
-3.5
10
0
5
0
-0.01
0
0.01
Time (sec)
0.02
-0.01
0
0.01
Time (sec)
0.02
12345
Rev. 1.11
- 20 -
L=27uH
L=27uH
R1221N33AB IN
(V =5V,I
OUT=0mA)
R1221N33AB(VIN=10V,IOUT=0mA)
3.5
3
3.5
3
2.5
2
2.5
2
1.5
1
0.5
0
1.5
1
0.5
0
5
-0.5
-1
-0.5
-1
10
-1.5
-2
-1.5
-2
-2.5
-3
-3.5
-2.5
-3
-3.5
0
0
-0.01
0
0.01
Time (sec)
0.02
-0.01
0
0.01
0.02
Time (sec)
R1221N33AA IN
(V =10V,IOUT=100mA)
R1221N33AA(VIN=5V,IOUT=100mA)
L=27uH
L=27uH
3.5
3.5
3
2.5
2
3
2.5
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
1.5
1
0.5
0
10
-0.5
-1
5
0
-1.5
-2
-2.5
-3
-2.5
-3
-3.5
0
-3.5
-0.01
0
0.01
0.02
-0.01
0
0.01
Time (sec)
0.02
Time (sec)
R1221N33AB(VIN=10V,IOUT=100mA)
L=27uH
R1221N33AB(VIN=5V,IOUT=100mA)
L=27uH
3.5
3
3.5
3
2.5
2
2.5
2
1.5
1
1.5
1
0.5
0
0.5
0
-0.5
-1
10
-0.5
-1
5
-1.5
-2
-1.5
-2
-2.5
-3
0
-2.5
-3
-3.5
0
-3.5
-0.01
0
0.01
Time (sec)
0.02
-0.01
0
0.01
Time (sec)
0.02
12345
Rev. 1.11
- 21 -
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