R1230D291G-TR [RICOH]
Switching Regulator, Current-mode, 575kHz Switching Freq-Max, CMOS, PDSO8, 0.9 MM HEIGHT, SON-8;
| 型号： | R1230D291G-TR |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Switching Regulator, Current-mode, 575kHz Switching Freq-Max, CMOS, PDSO8, 0.9 MM HEIGHT, SON-8 开关 光电二极管 |
| 文件： | 总26页 (文件大小：284K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PWM/VFM STEP-DOWN DC/DC CONVERTER
WITH SYNCHRONOUS RECTIFIER
NO. EA-085-0305
R1230D SERIES
OUTLINE
The R1230D Series are CMOS-based PWM step-down DC/DC Converters with synchronous rectifier, low supply
current.
Each of these ICs consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier, a soft-
start circuit, protection circuits, a protection against miss operation under low voltage (UVLO), PWM/VFM alternative
circuit, a chip enable circuit, and a driver transistor. 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
R1230D001G/H types, divider resistors are also necessary.) In terms of Output Voltage, it is fixed internally in the
R1230Dxx1E/F types. While in the R1230D001G/H types, Output Voltage is adjustable with external divider resistors.
PWM/VFM alternative circuit is active with Mode Pin of the R1230D Series. Thus, when the load current is small,
the operation can be switching into the VFM operation from PWM operation by the logic of MODE pin and the effi-
ciency at small load current can be improved. As protection circuits, Current Limit circuit which limits peak current of
Lx at each clock cycle, and Latch type protection circuit which works if the term of Over-current condition keeps on a
certain time in PWM mode exist. 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
• Built-in Driver ON Resistance ....................................P-channel 0.35Ω, N-channel 0.45Ω (at VIN=3V)
• Built-in Soft-start Function (Typ. 1.5ms), and Latch-type Protection Function (Delay Time; Typ. 1.5ms)
• Two choices of Oscillator Frequency...........................500kHz, 800kHz
• PWM/VFM alternative with MODE pin .....................PWM operation; MODE pin at "L",
VFM operation; MODE pin at "H"
• High Efficiency .............................................................Typ. 90%
• Output Voltage..............................................................Stepwise Setting with a step of 0.1V in the range of 1.2V ~
3.3V (xx1E/F Type) or adjustable in the range of 0.8V to VIN
(001G/H Type)
• High Accuracy Output Voltage ....................................±2.0% (xx1E/F Type)
• Package .........................................................................SON8 (Max height 0.9mm, thin type)
1
R1230D
APPLICATIONS
• Power source for portable equipment.
BLOCK DIAGRAM
• R1230Dxx1E/F
“L” PWM “H” VFM
V
DD
MODE
3
6
V
IN
5
1
8
V
OUT
OSC
PWM/VFM
CONTROL
Phase
Compensation
L
X
+
-
-
-
OUTPUT
CONTROL
Vref
+
Current Protection
UVLO
Soft Start
CE
“H” Active
CE
Chip Enable
4
2
7
PGND
AGND
• R1230D001G/H
“L” PWM “H” VFM
V
DD
MODE
3
6
VIN
5
1
8
V
FB
OSC
Phase
PWM/VFM
CONTROL
Compensation
LX
+
-
-
-
OUTPUT
CONTROL
Vref
+
Current Protection
UVLO
Soft Start
Chip Enable
“H” Active
CE
4
2
7
PGND
AGND
2
R1230D
SELECTION GUIDE
In the R1230D Series, the output voltage, the oscillator frequency, 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;
R1230Dxxxx-xx
↑↑↑ ↑
← Part Number
a bc d
Code
Contents
Setting Output Voltage(VOUT):
Stepwise setting with a step of 0.1V in the range of 1.2V to 3.3V is possible for E/F version.
"00" is for Output Voltage Adjustable G/H version (0.8V ~ )
a
1 : fixed
b
Designation of Optional Function
E : 500kHz, Fixed Output Voltage
F : 800kHz, Fixed Output Voltage
G : 500kHz, Adjustable Output Voltage
H : 800kHz, Adjustable Output Voltage
c
Designation of Taping Type; (Refer to Taping Specification)
"TR" is prescribed as a standard.
d
PIN CONFIGURATION
SON-8
7 6
8
5
1
2
3
4
3
R1230D
PIN DESCRIPTION
Pin No.
Symbol
Description
1
2
3
4
5
6
7
8
VIN
PGND
VDD
Voltage Supply Pin
Ground Pin
Voltage Supply Pin
CE
Chip Enable Pin (active with "H")
VOUT/VFB
MODE
AGND
LX
Output/Feedback Pin
Mode changer Pin (PWM mode at "L", VFM mode at "H".)
Ground Pin
LX Pin
ABSOLUTE MAXIMUM RATINGS
AGND=PGND=0V
Symbol
VIN
Item
VIN Supply Voltage
Rating
Unit
V
6.5
VDD
VDD Pin Voltage
6.5
V
VLX
LX Pin Voltage
-0.3 ~ VIN +0.3
-0.3 ~ VIN +0.3
-0.3 ~ VIN +0.3
-0.3 ~ VIN +0.3
-0.8
V
VCE
CE Pin Input Voltage
MODE Pin Input Voltage
VFB Pin Input Voltage
LX Pin Output Current
Power Dissipation
V
VMODE
VFB
V
V
ILX
A
PD
250
mW
°C
°C
Topt
Tstg
Operating Temperature Range
Storage Temperature Range
-40 ~ +85
-55 ~ +125
4
R1230D
ELECTRICAL CHARACTERISTICS
• R1230Dxx1E/F
Topt=25°C
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
VIN
Operating Input Voltage
2.4
5.5
V
Typ.×
Typ.×
VIN=VCE=VSET+1.5V,
VMODE=0V, IOUT=10mA
VOUT
Step-down Output Voltage
VSET
V
0.980
1.020
∆VOUT/
∆T
Step-down Output Voltage Tem-
perature Coefficient
ppm/
°C
-40°C ≤ Topt ≤ 85°C
±150
fosc
fosc
Oscillator Frequency (xx1E)
Oscillator Frequency (xx1F)
VIN=VCE=VSET+1.5V
VIN=VCE=VSET+1.5V
425
680
500
800
575
920
kHz
kHz
VIN=VCE=VSET+1.5V,
VOUT=VMODE=0V
IDD
Supply Current (xx1E)
Supply Current (xx1F)
230
250
300
350
µA
µA
VIN=VCE=VSET+1.5V,
VOUT=VMODE=0V
IDD
VIN=5.5V, VCE=VOUT=0V
VIN=5.0V
Istb
RONP
RONN
Standby Current
0
5
µA
Ω
0.20
0.20
0.35
0.45
0.60
0.70
ON Resistance of Pch Transistor
ON Resistance of Nch Transistor VIN=5.0V
Ω
VIN=5.5V, VCE=0V,
ILXleak
IVOUT
ICE
LX Leakage Current
VOUT Leakage Current
CE Input Current
-0.1
-0.1
0.0
0.0
0.0
0.1
0.1
0.1
µA
µA
µA
VLX=0V/5.5V
VIN=5.5V, VCE=0V,
VLX=0V/5.5V
VIN=5.5V, VMODE=0V,
VCE=5.5V/0V
-0.1
1.5
VCEH
VCEL
CE "H" Input Voltage
CE "L" Input Voltage
VIN=5.5V, VOUT=0V
VIN=2.4V, VOUT=0V
VMODE=0V
V
V
0.3
Maxdty Oscillator Maximum Duty Cycle
100
%
VMODE=VOUT=0V,
VIN=VCE=3.0V
VIN-
0.15
VIN-
0.35
VIN-
0.55
VLX LX Limit Voltage
V
5
R1230D
Topt=25°C
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
Tstart
Delay Time by Soft-Start function at no load, VIN=VCE=VSET+1.5V
0.5
1.5
2.5
2.5
ms
VIN=VCE=VSET+1.5V,
Delay Time for protection circuit
VMODE=0V
Tprot
VUVLO1
VUVLO2
IMODE
0.5
1.8
1.9
1.5
2.1
2.2
ms
V
VIN=VCE=2.5V → 1.5V,
UVLO Threshold Voltage
VOUT=0V
2.2
2.3
0.1
VIN=VCE=1. 5V → 2.5V,
UVLO Released Voltage
VOUT=0V
V
VIN=5.5V, VCE=0V,
MODE Pin Input Current
-0.1
1.5
µA
VMODE=5.5V/0V
VMODEH
VMODEL
MODE "H" Input Voltage
MODE "L" Input Voltage
VIN=VCE=5.5V, VOUT=0V
VIN=VCE=2.4V, VOUT=0V
V
V
0.3
85
VIN=VCE= VMODE=2.4V,
VOUT=0V
VFM Duty Cycle
55
65
%
VFMdty
• R1230D001G/H
Topt=25°C
Symbol
Item
Conditions
Min.
Typ.
Max.
Unit
VIN
Operating Input Voltage
Feedback Voltage
2.4
5.5
V
VIN=VCE=VSET+1.5V,
VMODE=0V, IOUT=10mA
VFB
0.776
0.800
±150
0.824
V
∆VFB/
∆T
Feedback Voltage
ppm/
°C
-40°C ≤ Topt ≤ 85°C
Temperature Coefficient
fosc
fosc
IDD
Oscillator Frequency (xx1G)
Oscillator Frequency (xx1H)
Supply Current (xx1G)
Supply Current (xx1H)
Standby Current
VIN=VCE=VSET+1.5V
425
680
500
800
230
250
0
575
920
300
350
5
kHz
kHz
µA
µA
µA
Ω
VIN=VCE=VSET+1.5V
VIN=VCE=5.5V, VFB=VMODE=0V
VIN=VCE=5.5V, VFB=VMODE=0V
VIN=5.5V, VCE=VFB=0V
IDD
Istb
RONP
RONN
ON Resistance of Pch Transistor VIN=5.0V
ON Resistance of Nch Transistor VIN=5.0V
0.20
0.20
0.35
0.45
0.60
0.70
Ω
6
R1230D
Topt=25°C
Symbol
Item
Conditions
VIN=5.5V, VCE=0V,
Min.
Typ.
Max.
Unit
ILXleak
LX Leakage Current
-0.1
0.0
0.1
0.1
0.1
µA
VLX=0V/5.5V
VIN=5.5V, VCE=0V,
VFB=0V/5.5V
IVFB
VFB Leakage Current
CE Input Current
-0.1
0.0
0.0
µA
µA
VIN=5.5V, VMODE=0V,
VCE=5.5V/0V
ICE
-0.1
1.5
VCEH
VCEL
VIN=5.5V, VFB=0V
VIN=2.4V, VFB=0V
VMODE=0V
V
V
CE "H" Input Voltage
CE "L" Input Voltage
0.3
maxdty Oscillator Maximum Duty Cycle
100
%
VIN=VCE=3.0V, VMODE=0V,
VFB=0V
VIN-
0.15
VIN-
0.35
VIN-
0.55
VLX
LX Limit Voltage
V
Tstart
Tprot
VUVLO1
VUVLO2
Delay Time by Soft-Start function at no load, VIN=VCE=VSET+1.5V
Delay Time for protection circuit VIN=VCE=3.6V, VMODE=0V
0.5
1.5
1.5
2.1
2.2
2.5
ms
ms
V
UVLO Threshold Voltage
UVLO Released Voltage
VIN=VCE=2.5V → 1.5V, VFB=0V
VIN=VCE=1.5V → 2.5V, VFB=0V
1.8
1.9
2.2
2.3
V
VIN=5.5V, VMODE=5.5V/0V,
VCE=0V
IMODE
MODE Pin Input Current
-0.1
1.5
0.1
µA
VMODEH
VMODEL
MODE "H" Input Voltage
MODE "L" Input Voltage
VIN=VCE=5.5V, VFB=0V
V
V
VIN=VCE=2.4V, VFB=0V
0.3
85
VFMdty VFM Duty Cycle
VIN=VCE=VMODE=2.4V, VFB=0V
55
65
%
7
R1230D
TEST CIRCUITS
VIN
LX
V
IN
LX
OSCILLOSCOPE
VDD
V
DD
CE
CE
VOUT
V
OUT
AGND
AGND
A
PGND MODE
PGND MODE
Test Circuit for Input Current and Leakage Current
Test Circuit for Input Voltage and UVLO voltage
OSCILLOSCOPE
VOUT
V
IN
LX
L
VDD
CE
10µF
VOUT
AGND
PGND MODE
Test Circuit for Output Voltage, Oscillator Frequency, Soft-Starting Time
OSCILLOSCOPE
V
V
IN
LX
V
V
IN
LX
DD
A
DD
CE
CE
A
VOUT
V
OUT
AGND
AGND
PGND MODE
PGND MODE
Test Circuit for Supply Current and Standby Current
Test Circuit for ON resistance of LX, Limit
Voltage, Delay Time of Protection Circuit
The bypass capacitor between power supply and GND is a ceramic capacitor 10µF.
8
R1230D
TYPICAL APPLICATION AND TECHNICAL NOTES
1) Fixed Output Voltage Type
V
OUT
V
IN
LX
L
C
IN
PGND AGND
MODE
LOAD
V
DD
C
OUT
CE
VOUT
L
: 10µH LQH3C100K54 (Murata)
COUT : 10µF ECSTOJX106R (Panasonic)
CIN : 10µF C3216JB0J106M (TDK)
VFM mode may work with a parasitic diode, but we recommend that VFM mode used with an external diode in be-
tween LX and GND. As for PWM mode, an external diode is not necessary.
2) Adjustable Output Voltage Type
L
VOUT
VIN
LX
CIN
PGND AGND
MODE
LOAD
R1
Cb
Rb
VDD
COUT
CE
VFB
R2
L
: 10µH LQH3C100K54 (Murata)
COUT : 10µF ECSTOJX106R (Panasonic)
CIN : 10µF C3216JB0J106M (TDK)
VFM mode may work with a parasitic diode, but we recommend that VFM mode used with an external diode in be-
tween LX and GND. As for PWM mode, an external diode is not necessary.
As for how to choose Cb, Rb, R1, and R2 values, refer to the technical notes.
9
R1230D
When you use these ICs, consider the following issues;
• Input same voltage into the power supply pins, VIN and VDD. Set the same level as AGND and PGND.
• When you control the CE pin and MODE pin by another power supply, do not make its "H" level more than the volt-
age 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.
• Use an external capacitor COUT with a capacity of 10µF or more, and with good high frequency characteristics such
as tantalum capacitors.
• At VFM mode, (MODE="H"), Latch protection circuit does not operate.
• If the mode is switched over into PWM mode from VFM mode during the operation, change the mode at light load
current. If the load current us large, output voltage may decline.
• Reinforce the VIN, PGND, and VOUT lines sufficiently. Large switching current may flow in these lines. If the imped-
ance of VIN and PGND lines is too large, the internal voltage level in this IC may shift caused by the switching cur-
rent, and the operation might be unstable.
✰The performance of power source circuits using these ICs extremely depends upon the peripheral circuits. Pay at-
tention 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
R1230D
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 en-
ergy 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
ILmin
topen
IOUT
L
Pch Tr
V
OUT
V
IN
i2
CL
Nch Tr
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 in-
creases 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.
• Discontinuous Conduction Mode and 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 ∆I;
∆I = 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
In Equation 1, VOUT × topen/L and (VIN - VOUT) × ton/L respectively show the change of the current at "ON", and the
change of the current at "OFF".
11
R1230D
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.
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 re-
spectively 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 = RL × IOUT + VOUT + Ronn × IOUT ...................................................................Equation 4
Put Equation 4 to Equation 3 and solve for ON duty of P-channel transistor, ton / (toff + ton) = DON,
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.
ꢀThe above explanation is directed to the calculation in an ideal case in continuous mode.
12
R1230D
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/(2π×R1×Cb)
First, choose the appropriate value of R1, R2 and Cb.
Set R1+R2 value 100kΩ or less.
For example, if L = 10µH, COUT = 10µF, the cut off frequency of the pole is approximately 16kHz.
To make the cut off frequency of the pole higher than 16kHz, set R1 = 42kΩ and Cb = 100pF.
If VOUT is set at 1.5V, R2 = 48kΩ is appropriate.
If a ceramic capacitor is desirable as COUT in your application, nonetheless of the usage of both the fixed output voltage
type and adjustable output type, add 0.2Ω or more resistance to compensate the ESR. Further, if a ceramic capacitor is
desirable to use as COUT without adding another resister to compensate the ESR, phase should be back drastically. To
make it, R2 value should be smaller compared to R1. As a result, the set output voltage may be large. For example, to
make VOUT = 1.5V, constants are R1 = 42kΩ, R2 = 48kΩ, and Cb = 100pF. If the ceramic capacitor is used, under the
heavy load condition, oscillation may be result. On the other hand, if R2 = 12kΩ and VOUT = 3.6V, phase back becomes
also large, and even if the device is used with a heavy load, the operation will be stable.
Rb is effective for reducing the noise on VFB, however, it is not always necessary. If it is necessary, use as much as
30kΩ as Rb.
13
R1230D
External Components
1. Inductor
Select an inductor that peak current does not exceed ILmax. If larger current than allowable current flows, mag-
netic saturation occurs and make transform efficiency 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 Output Voltage, therefore as much as 10µF tantalum type is recommended.
3. Diode
If VFM mode is chosen at light load, use a Schottky diode with small VF. A diode with small VF makes the efficiency
of the circuit improved. Small reverse direction current, IR is an important factor, however, VF has more important pri-
ority than IR.
TIMING CHART
Output
Short
Output Short
CE pin Voltage
Internal Opertional Internal Soft-start
Amplifier Output Set Voltage
Internal 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", then
after the output voltage reaches the set output voltage, they are balanced with the stable state. Herein, if the output pin
would be short circuit, the output of amplifier would become "H" again, and the condition would continue for 1.5ms (Typ.),
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 1.5ms after output shorted), the output of am-
plifier 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
R1230D
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
R1230D181E
1.9
1.85
1.8
V
V
V
V
IN=3.3V PWM
IN=3.3V VFM
IN=5.0V PWM
IN=5.0V VFM
1.75
1.7
1
1
1
10
100
1000
1000
1000
Output Current(mA)
R1230D181F
1.9
1.85
1.8
V
V
V
V
IN=3.3V PWM
IN=3.3V VFM
IN=5.0V PWM
IN=5.0V VFM
1.75
1.7
10
100
Output Current(mA)
R1230D331F
3.4
3.35
3.3
V
V
IN=5.0V PWM
IN=5.0V VFM
3.25
3.2
10
100
Output Current(mA)
15
R1230D
2) Efficiency vs. Output Current
R1230D181E
100
80
60
40
V
V
V
V
IN=3.3V PWM
IN=3.3V VFM
IN=5.0V PWM
IN=5.0V VFM
20
0
1
10
10
10
100
1000
1000
1000
Output Current(mA)
R1230D181F
100
90
80
70
60
50
40
30
20
10
V
V
V
V
IN=3.3V PWM
IN=3.3V VFM
IN=5.0V PWM
IN=5.0V VFM
0
1
100
Output Current(mA)
R1230D331F
100
80
60
40
V
V
IN=5.0V PWM
IN=5.0V VFM
20
0
1
100
Output Current(mA)
16
R1230D
3) Ripple Voltage vs. Output Current
R1230D181E
COUT=10µF Tantalum Capacitor ESR=400mΩ
PWM Mode VIN=5.0V, IOUT=200mA
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-1.00E-06 0.00E+00 1.00E-06 2.00E-06 3.00E-06 4.00E-06 5.00E-06 6.00E-06 7.00E-06 8.00E-06
Time(sec)
R1230D181F
COUT=10µF, Tantalum Capacitor, ESR=400mΩ
80
70
60
50
40
30
20
VIN=5.0V
VIN=3.3V
10
0
0
50
100
150
200
250
300
350
400
450
500
Output Current IOUT(mA)
R1230D181F
C
OUT=10µF Ceramic Capacitor ESR=220mΩ
PWM Mode VIN=5.0V, IOUT=200mA
0.04
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
-1.00E-06 0.00E+00 1.00E-06 2.00E-06 3.00E-06 4.00E-06 5.00E-06 6.00E-06 7.00E-06 8.00E-06
Time(sec)
17
R1230D
4) Output Waveform
R1230D181F
C
OUT=10µF Tantalum Capacitor ESR=400mΩ
PWM Mode VIN=5.0V, IOUT=10mA
0.05
0.04
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
-4.00E-06 -3.00E-06 -2.00E-06 -1.00E-06 0.00E+00 1.00E-06 2.00E-06 3.00E-06 4.00E-06
Time(sec)
R1230D181F
COUT=10µF Tantalum Capacitor ESR=400mΩ
PWM Mode VIN=5.0V, IOUT=100mA
0.04
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
-0.05
-0.06
-4.00E-06 -3.00E-06 -2.00E-06
-1.00E-06 0.00E+00
Time(sec)
1.00E-06
2.00E-06
3.00E-06
4.00E-06
5) Output Voltage vs. Input Voltage
R1230D181F
IOUT=20mA
1.90
1.85
1.80
VFM
PWM
1.75
1.70
2
2.5
3
3.5
4
4.5
5
5.5
6
Input Voltage VIN(V)
18
R1230D
6) Output Voltage vs. Temperature
R1230D181F
I
OUT=100mA
1.9
1.88
1.86
1.84
1.82
1.8
1.78
1.76
1.74
1.72
1.7
-60
-40
-20
0
20
40
60
60
60
80
100
Temperature Topt(°C)
R1230D001G/H
I
OUT=100mA
0.90
0.85
0.80
0.75
0.70
-60
-40
-20
0
20
40
80
100
Temperature Topt(°C)
7) Oscillator Frequency vs. Temperature
V
IN=VOUT+1.5V
1000
900
800
700
600
500
400
300
-60
-40
-20
0
20
40
80
100
Temperature Topt(°C)
19
R1230D
8) Supply Current vs. Temperature
V
IN=5.5V
450
380
310
240
800kHz
500kHz
170
100
-60
-40
-20
0
20
40
60
80
100
Temperature Topt(°C)
9) Soft-start time vs. Temperature
R1230D181F
V
IN=3.3V
3.0
2.4
1.8
1.2
800kHz
500kHz
0.6
0
-60
-40
-20
0
20
40
60
80
100
Temperature Topt(°C)
10) Delay Time for protection vs. Temperature
R1230D181F
3.0
2.4
1.8
1.2
0.6
0
-60
-40
-20
0
20
40
60
80
100
Temperature Topt(°C)
20
R1230D
11) UVLO Threshold/Released Voltage vs. Temperature
2.3
UVLO Released Voltage
2.25
2.2
2.15
2.1
UVLO Detector Threshold
2.05
2
1.95
1.9
1.85
1.8
-60
-40
-20
0
20
40
60
80
100
Temperature Topt(°C)
12) CE Pin Input Voltage vs. Temperature
1.6
1.4
1.2
1.0
13) Mode Pin
CEH
0.8
Input
CEL
-20
0.6
0.4
Voltage
vs. Tem-
perature
1.6
0.2
0
-60
-40
0
20
40
60
80
100
1.4
1.2
1.0
0.8
0.6
0.4
0.2
Temperature Topt(°C)
MODEH
MODEL
0
-60
-40
-20
0
20
40
60
80
100
Temperature Topt(°C)
21
R1230D
14) Duty Cycle at VFM Mode vs. Temperature
80
75
70
65
60
55
50
-60
-40
-20
0
20
40
60
80
100
Temperature Topt(°C)
15) Lx Transistor on Resistance vs. Temperature
VIN=3.0V
1.00
0.75
0.50
NchTr. On Resistance
0.25
PchTr. On Resistance
0
-60
-40
-20
0
20
40
60
80
100
Temperature Topt(°C)
16) Limit Voltage vs. Temperature
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
-60
-40
-20
0
20
40
60
80
100
Temperature Topt(°C)
22
R1230D
17) Load Transient Response
R1230D181F
VIN=5.0V PWM
0.6
IOUT=100mA
0.5
0.4
0.3
0.2
0.1
0
IOUT=0A
-0.1
-0.2
-0.3
-4.00E-05 -2.00E-05 0.00E+00 2.00E-05 4.00E-05 6.00E-05 8.00E-05 1.00E-04 1.20E-04 1.40E-04
Time(sec)
R1230D181F
VIN=5.0V PWM
0.6
0.5
IOUT=200mA
0.4
0.3
0.2
0.1
0
IOUT=0A
-0.1
-0.2
-0.3
-4.00E-05 -2.00E-05 0.00E+00 2.00E-05 4.00E-05 6.00E-05 8.00E-05 1.00E-04 1.20E-04 1.40E-04
Time(sec)
R1230D181F
VIN=5.0V PWM
0.6
0.5
0.4
0.3
0.2
0.1
0
IOUT=100mA
IOUT=0A
-0.1
-0.2
-0.3
-4.00E-06 -1.00E-06 6.00E-06 1.10E-05 1.60E-05 2.10E-05 2.60E-05 3.10E-05 3.60E-05
Time(sec)
23
R1230D
R1230D181F
VIN=5.0V PWM
0.6
IOUT=100mA
0.5
0.4
0.3
0.2
0.1
0
IOUT=2mA
-0.1
-0.2
-0.3
-0.0002 -0.0001
0
0.0001 0.0002 0.0003 0.0004 0.0005 0.0006 0.0007 0.0008
Time(sec)
R1230D181F
VIN=5.0V PWM
0.6
0.5
0.4
0.3
0.2
0.1
0
IOUT=200mA
IOUT=0A
-0.1
-0.2
-0.3
-4.00E-06 -1.00E-06 6.00E-06 1.10E-05 1.60E-05 2.10E-05 2.60E-05 3.10E-05 3.60E-05
Time(sec)
R1230D181F
VIN=5.0V PWM
0.6
0.5
0.4
0.3
0.2
0.1
0
IOUT=200mA
IOUT=2mA
-0.1
-0.2
-0.3
-0.0002 -0.0001
0
0.0001 0.0002 0.0003 0.0004 0.0005 0.0006 0.0007 0.0008
Time(sec)
24
R1230D
18) Turn-on Waveform
R1230D181F
PWM Mode IOUT=0A VIN=5.0V
5
4
3
2
1
0
4
2
CE
0
-2
-4
VOUT
-6
-8
-1
-10
-0.0004
0
0
0
0.0004 0.0008 0.0012 0.0016
Time(sec)
0.002
0.0024 0.0028
R1230D181F
PWM Mode IOUT=50mA VIN=5.0V
5
4
3
2
1
0
4
2
CE
0
-2
-4
VOUT
-6
-8
-1
-0.0004
-10
0.0004 0.0008 0.0012 0.0016
Time(sec)
0.002
0.0024 0.0028
R1230D181F
PWM Mode IOUT=200mA VIN=5.0V
5
4
3
2
1
0
4
2
CE
0
-2
-4
VOUT
-6
-8
-1
-0.0004
-10
0.0004 0.0008 0.0012 0.0016
Time(sec)
0.002
0.0024 0.0028
25
R1230D
R1230D181F
VFM Mode IOUT=0A VIN=5.0V
5
4
3
2
1
0
4
2
CE
0
-2
-4
VOUT
-6
-8
-1
-10
-0.0004
0
0.0004 0.0008 0.0012 0.0016
Time(sec)
0.002
0.0024 0.0028
R1230D181F
VFM Mode IOUT=50mA VIN=5.0V
5
4
3
2
1
0
4
2
CE
0
-2
-4
VOUT
-6
-8
-1
-10
-0.0004
0
0.0004 0.0008 0.0012 0.0016
Time(sec)
0.002
0.0024 0.0028
26
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