Transcript
RP4 0 1 x SERI ES 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: 0.4
(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 Adjustable types (RP401K001C/D) Symbol VIN
(Ta=25°C)
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
001D
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
0.6 0.6
VIN=VOUT=5.5V, VFB=1.0V
0.588
V
ppm /°C
±80 1020
1200
-40°C≤Ta≤85°C
±0.2
VOUT=3.3V
0.4
1380
0.2
0.2
μA μA
-0.2 2
80
μA μA
-0.2
0.86
kHz kHz /°C
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 Fixed output voltage types (RP401Kxx1A/B, RP401Nxx1C/D) Symbol VIN
Item
Conditions
(Ta=25°C)
MIN.
TYP.
Input Voltage
Vstart
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
Switching Frequency Temperature Coefficient
-40°C≤Ta≤85°C
±0.2
RONN
NMOS On-Resistance (*1)
VOUT=3.3V
0.4
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
Istandby VOUT
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 /°C
0.2
μA μA
-0.2 0.2
μA μA
-0.2 2 0.86
kHz
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
COUT 10µF×2
MODE MODE Control 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 (10 F×2,TDK) C1608JB0J106M (10 F,TDK)
C1608JB0J106M×2 (10 F×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 100k . 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 Diode
Inductor
IOUT VOUT
VIN CL
Lx Tr
Discontinuous
Continuous 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
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. 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=1k 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]
If the Lx peak current reaches 1.0A (Typ.), then Lx peak current limit circuit operates and control the duty ratio of Lx switch. 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
1.90
VIN =1.0V
1.85
VIN =1.5V
VIN =0.8V
1.90
VIN =1.2V
1.80 1.75 1.70
VIN =1.0V VIN =1.2V
1.85
VIN =1.5V
1.80 1.75 1.70
1.65
1.65
1.60 0.1
1
10 Output Current [mA ]
RP401K001x RP401x331x
100
1.60
1000
0.1
1
10 Output Current [mA ]
RP401K001x RP401x331x
VOUT =3.3V MODE=L
3.50
100
1000
VOUT =3.3V MODE=H
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
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
3.45 3.40 O utput Voltage [V]
3.45
O utput Voltage [V]
VIN =0.7V
1.95
VIN =0.8V
O utput Voltage [V]
O utput Voltage [V]
1.95
3.30 3.25 3.20
3.35 3.30 3.25 3.20
3.15
3.15
3.10 0.1
1
10 Output Current [mA ]
RP401K001x RP401x501x
100
3.10
1000
0.1
5.05
100
1000
VOUT =5.0V MODE=H 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 5.1 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]
VOUT =1.8V MODE=H
5 4.95
5.05 5 4.95 4.9
4.9
4.85
4.85
4.8
4.8
0.1
0.1
1
10
100
1000
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
VOUT =1.8V MODE=L
100
100
90
90
80
80
70
70 Efficiency [%]
Efficiency [%]
RP401K001x RP401x181x
60 50
VIN=0.7V
40
VIN=0.8V VIN=1.0V
30 20
0
0.1
1
10 Output Curr ent [mA]
RP401K001x RP401x331x
100
0.1
1000
100
100
90
90
80
80
70
70
60 VIN=0.7V VIN=0.8V VIN=1.2V VIN=1.5V VIN=2.0V VIN=2.5V VIN=3.0V
50 40 30 20
1
10 Output Curr ent [mA]
RP401K001x RP401x331x
VOUT =3.3V MODE=L
Efficiency [%]
Efficiency [%]
V IN=0.7V V IN=0.8V V IN=1.0V V IN=1.2V V IN=1.5V
40
10
0
100
1000
VOUT =3.3V MODE=H
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
10
0
0 0.1
16
50
20
VIN=1.5V
10
60
30
VIN=1.2V
VOUT =1.8V MODE=H
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
60 VIN=0.7V VIN=0.8V VIN=1.5V VIN=2.0V VIN=3.0V VIN=4.0V VIN=5.0V
40 30 20 10
100
RP401K001x RP401x551x
VOUT =5.5V MODE=L
100
50
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
200
150
0
100 -50
-25
0
25 Ta [°C]
50
75
100
6) Start-up voltage 1 vs. Temperature
-50
-25
0
25 Ta [°C]
50
75
100
7) Start-up Voltage 2 vs. Temperature V OUT =5.5V CE=VIN RL=5.5kO
RP401K001x RP401x551x
V OUT =5.5V CE=VOUT RL=5.5kO
RP401K001x RP401x551x
0.9
0.9
0.8
0.8
0.7
0.7
0.6
0.6
0.5
VIN [V]
VIN [V]
V OUT =3.3V
350
IDD2 [µA]
IDD2 [µA]
RP401K001D RP401N331D
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 Ta [°C]
50
75
RP401K001x RP401xxx1x
RL=1kO
3.5
100
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]
0
9) Soft start time vs. Input voltage (Ta=25°C)
RP401K001x RP401xxx1x
VOUT=1.8V VOUT=3.3V
2.5
VOUT=5.5V 2 1.5 1 0.5
0
0 -50
18
-25
-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
VOUT =3.3V V IN=1.5V MODE=L
RP401K001x RP401x331x
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) VOUT =3.3V VIN=1.5V IOUT =1mA MODE=L 5
VOUT
4
Lx
2
0 -1
3.31
1 0 3.32
3.30
3.30
3.29
3.29 3.28 0 Time [ms]
0.5
1
-1
VOUT=3.3V VIN=1.5V IOUT=100mA MODE=L
RP401K001C RP401x331x VOUT Lx
Output Voltage [V]
-2
5
VOUT
4
Lx
2
VOUT =3.3V VIN=1.5V IOUT =100mA MODE=H 5 4 3
2
2
0 -1
3.31
1
3
1
3.32
0 Time [us]
RP401K001D RP401x331x
Output Voltage [V]
-0.5
Lx waveform [V]
-1
1 0 3.32
-1
3.31
3.30
3.30
3.29
3.29
3.28
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 ILxpeak [mA]
-1
3.31
Lx waveform [V]
3
2
3.28
0.6 0.5 0.4 0.3 0.2 0.1 0 -50
-25
0
25 Duty [%]
22
4
3
1
3.32
5
50
75
100
-1
0 Time [us]
1
2
Lx waveform [V]
Output Voltage [V]
Lx
VOUT =3.3V VIN=1.5V IOUT =1mA MODE=H
RP401K001D RP401x331x
Output Voltage [V]
VOUT
Lx waveform [V]
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 could result in human injury or death (aircraft, spacevehicle, nuclear reactor control system, traffic control system, automotive and transportation equipment, combustion equipment, safety 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 to incorporate safety measures in their design, such as redundancy feature, firecontainment 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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