RP401x SERIES

RP401x SERIES
HIGH EFFICIENCY, SMALL PACKAGES, STEP-UP DC/DC CONVERTERS
NO.EA-260-111009
OUTLINE
RP401x Series are high efficiency, step-up DC/DC converter ICs packaged in compact 5pin SOT23-5， or 6pin
DFN(PLP)1820-6. This IC can start up from low voltage (Typ.0.6V), therefore, it is suitable for using with single or
2 serial alkaline batteries, or a nickel-metal-hydride (NiMH) battery, or one-cell Lithium-ion (Li+) battery.
This IC consists of an oscillator, a reference voltage unit with soft start, a chip enable circuit, an error amplifier,
phase compensation circuits, a slope circuit, a PWM control circuit, a start-up circuit, a PWM/VFM mode control
circuit, internal switches and a protection circuit.
A low ripple high efficiency step-up DC/DC converter can be composed of the RP401x with only an inductor, a
diode, (resisters for adjustable type), and capacitors. The output voltage of the RP401K001s is adjustable, and
others are fixed internally. The output voltage range is from 1.8V to 5.5V. RP401Kxx1A/B series have a MODE pin
to alternate between PWM fix and PWM/VFM automatic shift to improve the efficiency at light load. If MODE pin is
set "H", the mode is PWM fix, and when the MODE pin is set "L", PWM/VFM automatic shift. The RP401xxx1C
and D do not have MODE pin. The RP401xxx1C is PWM/PFM alternative type, and the RP401xxx1D is PWM
fixed type.
FEATURES
● Low Start-up Voltage guaranteed ···························· Typ. 0.6V
● Input Voltage Range ················································ 0.6V ~ 5.5V
● High Efficiency ························································· 86% (100mA / 3.3V, VIN = 1.5V, 25°C)
● Output current·························································· 500mA / 1.8V (VIN = 1.5V) / 5.0V (VIN = 3.3V)
● Built-in Lx switch ······················································ NMOS: 0.4Ω (VOUT = 3.3V, 25°C)
● PWM Oscillator Frequency ······································ 1.2MHz
● Output Voltage Range ············································· Fixed type: 1.8V to 5.5V with 0.1V Stepwise
Adjustable: 1.8V ~ 5.5V
(Recommendation range of output voltage)
● Lx peak current limit function ··································· Typ. 1.0A
● Latch protection delay time······································ 3.3ms (Only applied to A version)
● Small Packages ······················································· DFN(PLP)1820-6, SOT23-5
APPLICATIONS
● MP3 players, PDA, cellular phones
● Digital Still Cameras
● LCD Bias Supplies
● Portable blood pressure meter
● Wireless Handset
● GPS
1
RP401x Series
BLOCK DIAGRAMS
Fixed output; RP401Kxx1A/B
VIN
VFM
CONTROL
STARTUP
CIRCUIT
OSCILLATOR
VREF
CURRENT
PROTECTION
LX
SWITCHING
CONTROL
PWM
E/A
SOFT
START
CE
CURRENT
FEEDBACK
RAMP
COMPENSATION
CHIP
ENABLE
VOUT
MODE CONTROL
MODE
GND
Adjustable output type: RP401K001C/D
VIN
VFM
CONTROL*
OSCILLATOR
VREF
PWM
STARTUP
CIRCUIT
CURRENT
PROTECTION
LX
SWITCHING
CONTROL
E/A
SOFT
START
CE
RAMP
COMPENSATION
CURRENT
FEEDBACK
CHIP
ENABLE
VOUT
VFB
GND
*) Applied to PWM/VFM automatic shift, RP401K001C only.
2
RP401x Series
Fixed output type: RP401Nxx1C/D
VIN
VFM
CONTROL*
OSCILLATOR
VREF
PWM
STARTUP
CIRCUIT
CURRENT
PROTECTION
LX
SWITCHING
CONTROL
E/A
SOFT
START
CE
CURRENT
FEEDBACK
RAMP
COMPENSATION
CHIP
ENABLE
VOUT
GND
*) Applied to PWM/VFM automatic shift, RP401Nxx1C only.
SELECTION GUIDE
In the RP400 Series, output Voltage, Type of Output Voltage, and package for the ICs can be selected at the
user’s request.
Product Name
RP401Kxx1$-TR
RP401Nxx1$-TR-FE
Package
Quantity per Reel
Pb Free
Halogen Free
DFN (PLP)1820-6
5,000 pcs
Yes
Yes
SOT-23-5
3,000 pcs
Yes
Yes
xx: Designation of output voltage
00: Adjustable Version (1.8V ~ 5.5V) * recommendation range of output voltage / DFN(PLP)1820-6 only
xx: Fixed version: designation is possible in the range from 1.8V to 5.5V with a step of 0.1V
$: Designation of option.
A: with Mode pin, latch type over-current protection circuit
B: with Mode pin, without latch type over-current protection circuit
C: without Mode pin (PWM/VFM automatic shift)
D: without Mode pin (PWM-fix)
3
RP401x Series
Product code table
Fixed
Latch type
over-current
protection
Yes
DFN(PLP)1820-6
Yes
Fixed
No
DFN(PLP)1820-6
C
No
(PWM/VFM automatic shift)
Fixed
No
SOT-23-5
Adjustable
No
DFN(PLP)1820-6
D
No
(PWM fix)
Fixed
No
SOT-23-5
Adjustable
No
DFN(PLP)1820-6
Version
MODE pin
Output Voltage
A
Yes
B
package
PIN CONFIGURATION
DFN(PLP)1820-6
SOT-23-5
5
6
1
5
2
4
3
4
1
(Bottom View)
2
3
(Top View)
PIN DESCRIPTION
RP401Kxx1A/B: DFN(PLP)1820-6
Pin No
Symbol
Pin Description
1
VIN
Power Supply Pin
2
CE
Chip Enable Pin (Active with ”H”)
3
GND
4
Lx
5
MODE
6
VOUT
Ground Pin
Internal NMOS Switch Drain Pin
Mode pin for switch over PWM-fix or PWM/VFM alternative
Output Pin
* Tab is GND level. (They are connected to the reverse side of this IC.) Connected to the GND is the recommendation,
leaving it open is also possible.
RP401K001C/D: DFN(PLP)1820-6
4
Pin No
Symbol
Pin Description
1
VIN
Power Supply Pin
2
CE
Chip Enable Pin (Active with ”H”)
3
GND
4
Lx
Internal NMOS Switch Drain Pin
5
VFB
Feedback input voltage for setting output voltage
6
VOUT
Output Pin
Ground Pin
RP401x Series
* Tab is GND level. (They are connected to the reverse side of this IC.) Connected to the GND is the recommendation,
leaving it open is also possible.
RP401Nxx1C/D: SOT-23-5
Pin No
Symbol
1
CE
2
GND
3
VIN
4
VOUT
5
Lx
Pin Description
Chip Enable Pin (Active ”H”)
Ground Pin
Power Supply Pin
Output Pin
Internal NMOS Switch Drain Pin
ABSOLUTE MAXIMAM RATINGS
(GND=0V)
Symbol
Ratings
Unit
VIN Supply Voltage
-0.3 to 6.0
V
VOUT
VOUT Pin Voltage
-0.3 to 6.0
V
VLX
Lx Pin Input Voltage
-0.3 to 6.0
V
VCE
CE Pin Voltage
-0.3 to 6.0
V
VFB
VFB Pin Voltage
RP401K001C/D
-0.3 to 6.0
V
VMODE
MODE Pin Voltage
RP401K001A/B
-0.3 to 6.0
V
PD
Power Dissipation *
Ta
Ambient Temp Range
-40 to +85
°C
Tstg
Storage Temp Range
-55 to +125
°C
VIN
Items
SOT-23-5
420
DFN(PLP)1820-6
880
mW
*) As for Power Dissipation, 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 lifetime 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.
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.
5
RP401x Series
ELECTRICAL CHARACTERISTICS
(Ta=25°C)
Adjustable types (RP401K001C/D)
Symbol
VIN
Item
Conditions
TYP.
Input Voltage
MAX.
Unit
5.5
V
0.8
V
Vstart
Start-up Voltage
Load current =1mA
Vhold
Hold-on Voltage
Load current=1mA
IDD1
Quiescent Current 1
VIN=2V, VOUT=2.5V, VFB=0V
380
500
μA
IDD2
Quiescent Current 2
(No switching)
001C
130
190
μA
230
320
μA
Standby Current
VIN=VOUT=5.5V, VCE=0V
0.15
3.00
μA
Feedback Voltage
VIN=VOUT=3.3V
0.600
0.612
V
∆VOUT
/∆Ta
Output-Voltage
Temperature Coefficient
-40°C≤Ta≤85°C
Fosc
Switching Frequency
VIN=VOUT=3.3V, VFB=0V
∆fosc
/∆Ta
RONN
Switching Frequency
Temperature Coefficient
NMOS
On-Resistance (*1)
ICEH
CE ”H” Input Current
VIN=VOUT=VCE=5.5V
ICEL
CE ”L” Input Current
VIN=VOUT=5.5V, VCE=0V
IFBH
FB ”H” Input Current
VIN=VOUT=VFB=5.5V
IFBL
FB ”L” Input Current
VIN=VOUT=5.5V, VFB=0V
ILX
Lx Leakage Current
VIN=VOUT=VLX=5.5V, VCE=0V
ILxpeak
Lx Current limit (*2)
VIN=VSETx0.5V
VCEH
CE Input Voltage "H"
VCEL
CE Input Voltage "L"
Maxduty
Maximum Duty Cycle
VIN=VOUT=3.3V, VFB=0V
Soft start Time
VIN=1.65V, VOUT=3.3V, the time interval
from VCE changing from 0V to 1.5V edge
to VOUT being 2.97V
Istandby
VFB
tstart
001D
0.6
0.6
VIN=VOUT=5.5V, VFB=1.0V
0.588
V
ppm
/°C
±80
1020
1200
1380
kHz
-40°C≤Ta≤85°C
±0.2
kHz
/°C
VOUT=3.3V
0.4
Ω
0.2
0.2
2
80
μA
μA
-0.2
0.86
μA
μA
-0.2
1.00
μA
A
0.7
*1) Guaranteed by design. NMOS On-Resistance depends on the VOUT voltage.
*2) Lx limit current changes according to the switching duty ratio.
6
MIN.
V
0.4
V
88
95
%
0.7
3.0
ms
RP401x Series
(Ta=25°C)
Fixed output voltage types (RP401Kxx1A/B, RP401Nxx1C/D)
Symbol
VIN
Item
Conditions
Start-up Voltage
Load current =1mA
Vhold
Hold-on Voltage
Load current=1mA
IDD1
Quiescent Current 1
VIN=0.5xVSET, VOUT=0.95xVSET
IDD2
Quiescent Current 2
(No switching)
xx1A/B/C
Standby Current
VIN=VOUT=5.5V, VCE=0V
Output Voltage
VIN=VCE=1.5V
∆VOUT
/∆Ta
Output-Voltage
Temperature Coefficient
-40°C≤Ta≤85°C
Fosc
Switching Frequency
VIN=VOUT=3.3V, VFB=0V
∆fosc
/∆Ta
RONN
Switching Frequency
Temperature Coefficient
NMOS
On-Resistance (*1)
ICEH
CE ”H” Input Current
VIN=VOUT=VCE=5.5V
ICEL
CE ”L” Input Current
VIN=VOUT=5.5V, VCE=0V
IMODEH
MODE ”H” Input Current
VIN=VOUT=VMODE=5.5V
IMODEL
MODE ”L” Input Current
VIN=VOUT=5.5V, VMODE=0V
ILX
Lx Leakage Current
VIN=VOUT=VLX=5.5V, VCE=0V
ILxpeak
Lx Current limit (*2)
VIN=VSETx0.5V
VCEH
CE Input Voltage "H"
VCEL
CE Input Voltage "L"
Maxduty
Maximum Duty Cycle
VIN=VOUT=0.95 x VSET
tstart
Soft start Time
tprot
Protection Delay Time
VOUT
TYP.
Input Voltage
Vstart
Istandby
MIN.
xx1D
0.6
MAX.
Unit
5.5
V
0.8
V
0.6
VIN=VOUT=5.5V
V
VOUTx90
+130
VOUTx100
+250
μA
130
190
μA
230
320
μA
0.15
3.00
μA
x1.02
V
x0.98
ppm
/°C
±80
1020
1200
1380
kHz
-40°C≤Ta≤85°C
±0.2
kHz
/°C
VOUT=3.3V
0.4
Ω
0.2
μA
-0.2
0.2
μA
μA
-0.2
2
0.86
μA
1.00
μA
A
0.7
V
0.4
V
88
95
%
VIN=VSET x 0.5, the time interval from
VCE changing from 0V to 1.5V edge
to VOUT being VSET x 0.9
0.7
3.0
ms
VIN=VCE=3.3V
3.3
5.0
ms
80
*1) Guaranteed by design. NMOS On-Resistance depends on the VOUT voltage.
*2) Lx limit current changes according to the switching duty ratio.
*3) Applied to A/B version
*4) Applied to A version.
7
RP401x Series
APPLICATION NOTES
Fixed Output Voltage Type (RP401Kxx1A/B)
L
4.7µH
Schottky Diode
VOUT
LX
VIN
CIN
10µF
RP401Kxx1x
CE
VOUT
CE Control
MODE Control
MODE
COUT
10µF×2
GND
Adjustable output type (RP401K001C/D)
L
4.7µH
Schottky Diode
VOUT
LX
VIN
CIN
10µF
RP401K001x
CE
VOUT
CE Control
GND
COUT
10µF×2
R2
VFB
R1
8
RP401x Series
Fixed output type (RP401Nxx1C/D)
L
4.7µH
Schottky Diode
VOUT
LX
VIN
CIN
10µF
CE Control
RP401Nxx1x
VOUT
CE
COUT
10µF×2
GND
External components
Capacitor CIN: C1608JB0J106M (TDK), COUT:
VOUT[V]
ILmax<700mA
1.8≤VOUT<3.3
3.3≤VOUT≤5.5
ILmax≥700mA
C1608JB0J106M×2 (10μF×2,TDK)
C1608JB0J106M (10μF,TDK)
C1608JB0J106M×2 (10μF×2,TDK)
Diode: ILmax<700mA, CRS02 (TOSHIBA). ILmax≥700mA, CMS06(TOSHIBA)
Inductor: SLF7028T-4R7M1R5-PF (TDK), depending on the conditions, smaller L can be used with.
(ex. VLS2012: TDK)
● Setting of Output Voltage for RP401K001C/D
Output voltage can be set with divider resistors for voltage setting, R1 and R2 as shown in the typical application.
Refer to the next formula.
Output Voltage = VFB × (R1 + R2) / R1
(VFB = 0.6V)
Recommended value of resistors: Choose R1 and R2 so as to become (R1 + R2) being lower than 100kΩ.
Make sufficient power supply and ground. The large switching current may flow through the power line and GND
line. If their impedance is high, the internal voltage of the IC may shift by the switching current and unstable
operation may result. At turning off the built-in Lx switch, an over-shoot spike on the output may be generated by
the inductor, therefore voltage rating of the output capacitor and the diode is 1.5 or more times as much as setting
output voltage.
Use a diode of a low Vf Schottky type with high switching speed, low reverse current, and the current rating.
The RP401x uses the VOUT voltage as the main power supply after start-up. Therefore the capacitor between
Vout and GND has a role of the bypass capacitor for this IC. Use capacitors with a capacity of 10μF or more for
9
RP401x Series
VOUT pin. Consider the bias shift, choose the enough capacity of the capacitor. A ceramic capacitor (10μF)
between VIN and ground should be set.
The inductor value recommendation is 4.7μH. Choose an inductor that has small D.C. resistance and large
enough permissible current and hard to reach magnetic saturation.
If the spike noise on Lx pin is large, put a snub circuit (CR serial connection etc.) in parallel with the diode and
reduce the spike noise. The time constants of CR depends on the PCB and have an impact on the efficiency,
therefore fully evaluation is necessary. (Basic value is 10ohm and 300pF)
The MODE pin is controlled with a logic voltage. To make it "H", 1.0V or more must be forced to the MODE pin.
If power supply is less than 1.0V, MODE pin must be pulled up to VOUT.
The RP401xxxxA can reset the latch protection with CE signal. If CIN is too large, and VIN does not reach 0.8V,
even if the IC starts up with CE signal, the latch operation may not be reset correctly. The sequence of VIN and CE
must be cared. In the case of CE pin pulled-up to VIN pin or VOUT pin, the operation of latch protection reset may
not work correctly.
*The performance of power circuit using those 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. (such as the voltage, current , and power)
10
RP401x Series
OUTPUT CURRENT OF STEP-UP CIRCUIT AND EXTERNAL COMPONENTS
<Basic Circuit>
Diode
Inductor
IOUT
VOUT
VIN
CL
Lx Tr
<Current
through L>
Continuous
Discontinuous
ILxmax
IL
IL
ILxmax
ILxmin
ILxmin
tf
Iconst
t
ton
T=1/fosc
t
ton
T=1/fosc
toff
toff
There are two modes, or discontinuous mode and continuous mode for the PWM step-up switching regulator
depending on the continuous characteristic of inductor current. During on time of the transistor, when the voltage
added on to the inductor is described as VIN, the current is VIN × t / L.
Therefore, the electric power, PON, which is supplied with input side, can be described as in the next formula.
PON = ∫
ton
0
VIN2 × t/L dt ····························································································· Formula 1
With the step-up circuit, electric power is supplied from power source also during off time. In this case, input
current is described as (VOUT – VIN) × t / L, therefore electric power, POFF is described as in the next formula.
POFF = ∫
tf
0
VIN × (VOUT − VIN)t/L dt ·········································································· Formula 2
In this formula, tf means the time of which the energy saved in the inductance is being emitted. Thus average
electric power, PAV is described as in the next formula.
PAV = 1/(ton + toff) × { ∫
ton
0
VIN2 × t/L dt + ∫
tf
0
VIN × (VOUT − VIN)t/L dt} ·············· Formula 3
11
RP401x Series
In PWM control, when tf = toff is true, the inductor current becomes continuous, then the operation of switching
regulator becomes continuous mode. In the continuous mode, the deviation of the current is equal between on
time and off time.
VIN × ton / L = (VOUT – VIN) × toff / L ··············································································· Formula 4
Further, the electric power, PAV is equal to the output electric power, VOUT × IOUT, thus,
IOUT = fosc × VIN2 × ton2 /｛2 × L (VOUT – VIN)｝ = VIN2 × ton / (2 × L × VOUT)····················· Formula 5
When IOUT becomes more than VIN × ton × toff / (2 × L × (ton + toff)), the current flows through the inductor and
the mode becomes continuous. The continuous current through the inductor is described as lconst, then,
IOUT = fosc × VIN2 × ton2 / (2 × L × (VOUT – VIN)) + VIN × Iconst / VOUT ······························ Formula 6
In this moment, the peak current, Ilxmax flowing through the inductor and the driver Tr. Is described as follows:
Ilxmax = Iconst + VIN × ton / L ······················································································· Formula 7
With the formula 4, 6 and Ilxmax is
Ilxmax = VOUT / VIN × IOUT + VIN × ton / (2 × L) ······························································ Formula 8
However, ton = (1 – VIN / VOUT) / fosc
Therefore, peak current is more than IOUT. Considering the value of Ilxmax, the condition of input and output,
and external components should be selected.
In the formula 7, peak current Ilxmax at discontinuous mode can be calculated. Put lconst = 0 in the formula.
The explanation above is based on the ideal calculation, and the loss caused by Lx switch and external
components is not included.
Select the inductor and the diode with considering the peak current of the (Formula 8).
12
RP401x Series
■ TIMING CHART
Soft start operation and Latch protection operation
Input
Voltage
CE
Voltage
Output
Current
1.65V (TYP.)
Output
Voltage
LX
Voltage
tprot
3.3ms (TYP.)
0.7ms (TYP.)
Standby
Low-Boost
Mode
(f osc ≒200kHz)
Soft Start Period
1
VFM Mode*
WM Mode
LX-Peak
Current
Limit
2
Latch Protect*
*1) Applied to A/B/C version. (MODE="L" for version A/B)
*2) Applied to A version only.
<Start-up> When the CE pin becomes from "L" to "H", then the DC/DC converter starts up. In the RP401 series,
low input voltage (Typ. 0.6V) operation is possible due to the low- boost mode. Until the output voltage reaches
1.65V (Typ.) the mode is low-boost mode. When the output voltage becomes 1.65V or more, to suppress the
inrush current, soft start operation starts and boosts the output voltage to set value.
*) At the low-boost mode, the oscillator frequency is reduced to 200kHz (Typ.), therefore, compared with the
normal operation frequency 1.2MHz, the boost capability is worse. Therefore, step-up ratio and load current must
be cared.
*) Soft-start time depends on the set output voltage, input voltage, temperature, and the load current. Refer to the
next graphs.
13
RP401x Series
Soft Start Period vs. Temperature RP401xxx1x
Soft Start Period vs. Input Voltage RP401xxx1x
IOUT=1mA
VIN=VSET×0.5, RL=1kΩ
3.5
3
VSET=1.8V
2.5
VSET=3.3V
Soft Start Period [ms]
Soft Start Period [ms]
3.5
VSET=5.5V
2
1.5
1
0.5
0
3
VSET=1.8V
2.5
VSET=3.3V
VSET=5.5V
2
1.5
1
0.5
0
0.5
1.5
2.5
3.5
4.5
-50
-25
Input Voltage [V]
0
25
50
75
100
Ta [°C]
<Over-current protection operation>
If the Lx peak current reaches 1.0A (Typ.), then Lx peak current limit circuit operates and control the duty ratio of
Lx switch.
<Latch Protection Operation> applied to A version only
If over current state continues for a protection delay time (tPROT), then latch protection function starts and latch the
internal driver switch being off and the operation of DC/DC converter will stop.
To release the latch protection circuit, toggled input for CE pin is necessary.
Lx current limit(ILXPEAK) and the protection delay time (tprot) are influenced by the self-heating, heat radiation
environment at mounting on board. If short circuit may happen, input voltage (VIN) drops largely or becomes
unstable, the protection operation and the delay time will be influenced.
14
RP401x Series
TYPICAL CHARACTERISTICS
1) Output voltage vs. output current (Ta=25°C)
RP401K001x
RP401x181x
RP401K001x
RP401x181x
VOUT =1.8V
MODE=L
2.00
2.00
VIN =0.7V
1.95
VIN =0.8V
1.90
VIN =1.0V
1.85
VIN =1.5V
VIN =0.8V
1.80
1.75
1.70
1.65
0.1
1
10
Output Current [mA ]
RP401K001x
RP401x331x
VIN =1.2V
1.85
VIN =1.5V
1.80
1.75
1.70
100
1.60
1000
0.1
1
10
Output Current [mA ]
RP401K001x
RP401x331x
VOUT =3.3V
MODE=L
3.50
3.50
VIN =0.7V
VIN =0.8V
VIN =1.2V
VIN =1.5V
VIN =2.0V
VIN =2.5V
VIN =3.0V
3.40
3.35
100
VI N=0. 7V
VI N=0. 8V
VI N=1. 2V
VI N=1. 5V
VI N=2. 0V
VI N=2. 5V
VI N=3. 0V
3.40
3.30
3.25
3.20
3.15
1000
VOUT =3.3V
MODE=H
3.45
O utput Voltage [V]
3.45
O utput Voltage [V]
VIN =1.0V
1.65
1.60
3.35
3.30
3.25
3.20
3.15
3.10
0.1
1
10
Output Current [mA ]
RP401K001x
RP401x501x
100
3.10
1000
0.1
5.05
100
VI N=0. 7V
VI N=0. 8V
VI N=0. 9V
VI N=1. 2V
VI N=1. 5V
VI N=3. 2V
VI N=3. 7V
VI N=4. 2V
5.1
5
4.95
4.9
1000
VOUT =5.0V
MODE=H
5.15
O utput Voltage [V]
5.1
10
Output Current [mA ]
5.2
VI N=0. 7V
VI N=0. 8V
VI N=0. 9V
VI N=1. 2V
VI N=1. 5V
VI N=3. 2V
VI N=3. 7V
VI N=4. 2V
5.15
1
RP401K001x
RP401x501x
VOUT =5.0V
MODE=L
5.2
O utput Voltage [V]
VIN =0.7V
1.90
VIN =1.2V
O utput Voltage [V]
O utput Voltage [V]
1.95
VOUT =1.8V
MODE=H
5.05
5
4.95
4.9
4.85
4.85
4.8
4.8
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current [mA ]
Output Current [mA ]
15
RP401x Series
RP401K001x
RP401x551x
VOUT =5.5V
MODE=L
5.90
5.90
5.80
5.80
5.70
5.70
O utput Voltage [V]
O utput Voltage [V]
RP401K001x
RP401x551x
5.60
5.50
VIN =0.7V
VIN =0.8V
VIN =1.5V
VIN =2.0V
VIN =3.0V
VIN =4.0V
VIN =5.0V
5.40
5.30
5.20
VOUT =5.5V
MODE=H
5.60
5.50
VI N=0. 7V
VI N=0. 8V
VI N=1. 5V
VI N=2. 0V
VI N=3. 0V
VI N=4. 0V
VI N=5. 0V
5.40
5.30
5.20
5.10
5.10
0.1
1
10
Output Current [mA ]
100
0.1
1000
1
10
Output Current [mA ]
100
1000
2) Efficiency vs. Output current (Ta=25°C)
RP401K001x
RP401x181x
100
90
90
80
80
70
70
60
50
VIN=0.7V
40
VIN=0.8V
VIN=1.0V
30
0
0.1
1
10
Output Curr ent [mA]
RP401K001x
RP401x331x
100
0.1
1000
80
80
70
70
Efficiency [%]
90
60
VIN=0.7V
VIN=0.8V
VIN=1.2V
VIN=1.5V
VIN=2.0V
VIN=2.5V
VIN=3.0V
40
30
20
10
10
Output Curr ent [mA]
100
1000
VOUT =3.3V
MODE=H
100
90
50
1
RP401K001x
RP401x331x
VOUT =3.3V
MODE=L
100
Efficiency [%]
V IN=0.7V
V IN=0.8V
V IN=1.0V
V IN=1.2V
V IN=1.5V
40
10
0
60
V IN=0.7V
V IN=0.8V
V IN=1.2V
V IN=1.5V
V IN=2.0V
V IN=2.5V
V IN=3.0V
50
40
30
20
10
0
0
0.1
16
50
20
VIN=1.5V
10
60
30
VIN=1.2V
20
VOUT =1.8V
MODE=H
100
Efficiency [%]
Efficiency [%]
RP401K001x
RP401x181x
VOUT =1.8V
MODE=L
1
10
Output Curr ent [mA]
100
1000
0.1
1
10
Output Curr ent [mA]
100
1000
RP401x Series
RP401K001x
RP401x501x
RP401K001x
RP401x501x
VOUT =5.0V
MODE=L
100
100
90
90
80
80
70
60
Efficiency [%]
Efficiency [%]
70
VIN=0.7V
VIN=0.8V
VIN=0.9V
VIN=1.2V
VIN=1.5V
VIN=3.2V
VIN=3.7V
VIN=4.2V
50
40
30
20
10
60
VIN=0.7V
VIN=0.8V
VIN=0.9V
VIN=1.2V
VIN=1.5V
VIN=3.2V
VIN=3.7V
VIN=4.2V
50
40
30
20
10
0
0
0.1
1
10
100
1000
0.1
1
Output Curr ent [mA]
100
90
90
80
80
70
70
VIN=0.7V
VIN=0.8V
VIN=1.5V
VIN=2.0V
VIN=3.0V
VIN=4.0V
VIN=5.0V
50
40
30
20
10
100
RP401K001x
RP401x551x
VOUT =5.5V
MODE=L
100
60
10
1000
Output Curr ent [mA]
Efficiency [%]
Efficiency [%]
RP401K001x
RP401x551x
VOUT =5.5V
MODE=H
60
V IN=0.7V
V IN=0.8V
V IN=1.5V
V IN=2.0V
V IN=3.0V
V IN=4.0V
V IN=5.0V
50
40
30
20
10
0
0
0.1
1
10
Output Curr ent [mA]
100
1000
3) Standby Current vs. Temperature
0.1
1
10
Output Curr ent [mA]
100
1000
4) Supply Current1 vs. Temperature
RP401K001x
RP401x331x
RP401K001x
RP401x331x
V OUT =3.3V
0.6
V OUT =3.3V
700
0.5
600
0.4
IDD1 [µA]
Stanby Current [uA]
VOUT =5.0V
MODE=H
0.3
500
400
0.2
300
0.1
0
200
-50
-25
0
25
Ta [°C]
50
75
100
-50
-25
0
25
Ta [°C]
50
75
100
17
RP401x Series
5) Supply Current 2 vs. Temperature
RP401K001C
RP401x331A/B/C
V OUT =3.3V
250
200
300
150
250
100
50
-50
-25
0
25
Ta [°C]
50
75
100
100
6) Start-up voltage 1 vs. Temperature
-50
0
25
Ta [°C]
50
75
100
7) Start-up Voltage 2 vs. Temperature
0.9
V OUT =5.5V
CE=VOUT
RL=5.5kO
RP401K001x
RP401x551x
0.9
0.8
0.8
0.7
0.7
0.6
0.6
0.5
VIN [V]
VIN [V]
-25
V OUT =5.5V
CE=VIN
RL=5.5kO
RP401K001x
RP401x551x
0.4
0.3
0.5
0.4
0.3
0.2
0.2
0.1
0.1
0
-50
-25
0
25
Ta [°C]
50
75
0
100
-50
8) Soft start time vs. Temperature
-25
0
25
Ta [°C]
50
75
100
9) Soft start time vs. Input voltage (Ta=25°C)
RP401K001x
RP401xxx1x
RP401K001x
RP401xxx1x
RL=1kO
3.5
IOUT =1mA
3.5
3
3
VOUT=1.8V
VOUT=3.3V
2.5
VOUT=5.5V
2
1.5
1
0.5
Soft Start Period [ms]
Soft Start Period [ms]
200
150
0
VOUT=1.8V
VOUT=3.3V
2.5
VOUT=5.5V
2
1.5
1
0.5
0
0
-50
18
V OUT =3.3V
350
IDD2 [µA]
IDD2 [µA]
RP401K001D
RP401N331D
-25
0
25
Ta [°C]
50
75
100
0.5
1.5
2.5
Input V oltage [V]
3.5
4.5
RP401x Series
10) Frequency vs. Temperature
11) Maximum duty cycle vs. Temperature
RP401K001x
RP401x331x
RP401K001x
RP401x331x
V OUT =3.3V
1300
98
1275
96
1250
94
1225
maxdty [%]
fosc [kHz]
V OUT =3.3V
100
1200
1175
92
90
88
86
1150
84
1125
82
1100
- 50
80
-25
0
25
Ta [°C]
50
75
100
-50
-25
0
25
Ta [°C]
50
75
100
12) Lx current limit vs. duty cycle
RP401K001x
RP401x181x
V OUT =3.3V
2000
1800
-40°C
1800
-40°C
1600
25°C
1600
25°C
85°C
1400
ILxpeak [mA]
ILxpeak [mA]
2000
1200
1000
85°C
1400
1200
1000
800
800
600
600
400
400
0
25
50
75
100
Duty [%]
0
25
50
75
100
Duty [%]
RP401K001x
RP401x551x
V OUT =5.5V
2000
ILxpeak [mA]
RP401K001x
RP401x331x
V OUT =1.8V
1800
-40°C
1600
25°C
85°C
1400
1200
1000
800
600
400
0
25
50
75
100
Duty [%]
19
RP401x Series
13) Lx Current limit vs. Temperature
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
VIN=0.7V
VIN=1.0V
VIN=1.5V
-50
-25
0
25
Ta [°C]
50
ILxpeak [mA]
RP401K001x
RP401x551x
75
V IN=0.7V
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
V IN=1.0V
V IN=1.5V
V IN=2.0V
V IN=2.5V
V IN=3.0V
-50
100
-25
0
25
Ta [°C]
50
75
100
V OUT =5.5V
V IN=1.5V
V IN=2.0V
V IN=3.0V
V IN=4.0V
V IN=5.0V
-25
0
25
Ta [°C]
50
75
100
14) CE input voltage "H" vs. Temperature
RP401K001x
RP401x331x
15) MODE input voltage "H" vs. Temperature
RP401K331A/B
V OUT =3.3V
0.8
1
0.7
0.9
0.6
0.8
VMODEH [V]
VCEH [V]
V OUT =3.3V
V IN=0.7V
2800
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
-50
0.5
0.4
0.3
0.7
0.6
0.5
0.2
-50
20
RP401K001x
RP401x331x
V OUT =1.8V
ILxpeak [mA]
ILxpeak [mA]
RP401K001x
RP401x181x
-25
0
25
Ta [°C]
50
75
100
0.4
-50
-25
0
25
Ta [°C]
50
75
100
RP401x Series
16) Output voltage vs. Temperature
17) Feedback voltage vs. Temperature
RP401K001x
RP401x331x
0.63
3.5
3.45
0.62
0.61
3.35
VFB [V]
Output Voltage [V]
3.4
3.3
3.25
0.6
0.59
3.2
0.58
3.15
0.57
-50
3.1
-50
-25
0
25
Ta [°C]
50
75
100
-25
0
25
Ta [°C]
50
75
100
18) Start-up waveform (Ta=25°C)
RP401K001x
RP401x331x
VOUT =3.3V
VIN=2.0V IOUT =1mA
1.0
0.9
4.0
3.5
0.8
0.7
Output Voltage
0.6
Voltage [V]
2.0
1.5
1.0
0.5
0.4
CE Input Voltage
0.5
0.0
0.3
0.2
Input Curr ent
Intput Current [A]
3.0
2.5
0.1
0.0
0.0
0.5
1.0
1.5
Time [ms]
2.0
2.5
3.0
19) Load transient response (Ta=25°C)
VOUT =3.3V
V IN=1.5V MODE=L
RP401K001x
RP401x331x
RP401K001x
RP401x331x
VOUT =3.3V
V IN=1.5V MODE=L
150
150
3.40
3.35
3.30
3.25
Output V oltage
3.15
3.10
- 100
100
50
0
3.40
Output Current [mA]
0
O utput Voltage [V]
50
Output Current
10mA => 100mA
3.20
Output Current
100mA => 10mA
Output Current [mA]
O utput Voltage [V]
100
3.35
3.30
3.25
Output V oltage
3.20
3.15
0
100
200 300 400 500
Time [us]
600
700
800
900
3.10
- 100
0
100
200
300 400 500
Time [us]
600
700
800
900
21
RP401x Series
20) Output voltage waveform (Ta=25°C)
5
VOUT
4
Lx
3
2
0
-1
3.31
1
0
3.32
3.30
3.29
3.29
3.28
0.5
1
VOUT=3.3V VIN=1.5V
IOUT=100mA MODE=L
RP401K001C
RP401x331x
VOUT
Lx
Output Voltage [V]
-2
VOUT
4
Lx
1
2
VOUT =3.3V VIN=1.5V
IOUT =100mA MODE=H
5
4
3
3
2
2
0
-1
3.31
0
Time [us]
RP401K001D
RP401x331x
5
1
3.32
-1
1
0
3.32
3.30
3.30
3.29
3.29
3.28
-1
3.31
3.28
-2
-1
0
Time [us]
1
2
-2
21) Hold-on voltage vs. Temperature
RP401K001x
RP401xxx1x
IOUT =1mA
0.9
V OUT=1.8V
0.8
V OUT=3.3V
0.7
V OUT=5.5V
0.6
0.5
0.4
0.3
0.2
0.1
0
-50
-25
0
25
Duty [%]
50
75
100
-1
0
Time [us]
1
2
Lx waveform [V]
0
Time [ms]
Output Voltage [V]
-0.5
Lx waveform [V]
-1
ILxpeak [mA]
-1
3.31
3.30
3.28
22
4
2
1
3.32
5
3
Output Voltage [V]
Output Voltage [V]
Lx
Lx waveform [V]
VOUT
VOUT =3.3V VIN=1.5V
IOUT =1mA MODE=H
RP401K001D
RP401x331x
Lx waveform [V]
VOUT =3.3V VIN=1.5V
IOUT =1mA MODE=L
RP401K001C
RP401x331x
RP401x Series
22) Mode alternative waveform (Ta=25°C)
RP401K331A /B
RP401K331A /B
VIN=1.5V IOUT =0.1mA
3.40
VIN=1.5V IOUT =0.1mA
2
3.40
2
Output Voltage
3.20
-5
-4
-3
-2
-1
0
1
Time [ms]
2
3
4
5
MODE Input Voltage
1.5V => 0V
3.35
0
MODE Input Voltage[V]
3.30
3.25
1
0
O utput Voltage [V]
MODE Input Voltage
0V => 1.5V
3.35
MODE Input Voltage[V]
O utput Voltage [V]
1
3.30
3.25
Output Voltage
3.20
-5
-4
-3
-2
-1
0
1
Time [ms]
2
3
4
5
23
1. The products and the product specifications described in this document are subject to change or
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
information thereon.
2. The materials in this document may not be copied or otherwise reproduced in whole or in part
without prior written consent of Ricoh.
3. Please be sure to take any necessary formalities under relevant laws or regulations before
exporting or otherwise taking out of your country the products or the technical information
described herein.
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.
6. We are making our continuous effort to improve the quality and reliability of our products, but
semiconductor products are likely to fail with certain probability. In order to prevent any injury to
persons or damages to property resulting from such failure, customers should be careful enough
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feature and fail-safe feature. We do not assume any liability or responsibility for any loss or
damage arising from misuse or inappropriate use of the products.
7. Anti-radiation design is not implemented in the products described in this document.
8. Please contact Ricoh sales representatives should you have any questions or comments
concerning the products or the technical information.
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