RP504L121A2-TR [RICOH]
Switching Controller;
| 型号： | RP504L121A2-TR |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Switching Controller 开关 |
| 文件： | 总39页 (文件大小：794K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RP504x Series
600 mA PWM/VFM Step-Down DC/DC Converter with Synchronous Rectifier
NO.EA-259-150130
OUTLINE
The RP504x is a low supply current CMOS-based PWM/VFM step-down DC/DC converter with synchronous
rectifier featuring 600 mA*1 output current. Internally, a single converter consists of an oscillator, a reference
voltage unit, an error amplifier, a switching control circuit, a mode control circuit (RP504xxx1A/D), a soft-start
circuit, a Latch-type protection circuit, an under voltage lockout (UVLO) circuit a.nd switching transistors.
The RP504x is employing synchronous rectification for improving the efficiency of rectification by replacing
diodes with built-in switching transistors. Using synchronous rectification not only increases circuit performance
but also allows a design to reduce parts count.
Power controlling method can be selected from forced PWM control type or PWM/VFM auto switching control
type by inputting a signal to the MODE pin. In low output current, forced PWM control switches at fixed frequency
rate in order to reduce noise. Likewise, in low output current, PWM/VFM auto switching control automatically
switches from PWM mode to VFM mode in order to achieve high efficiency.
Output voltage is internally fixed type which allows output voltages that range from 0.8 V to 3.3 V in 0.1 V step.
The output voltage accuracy is as high as ±1.5% or ±18 mV.
Protection circuits included in the RP504x are overcurrent protection circuit and latch type protection circuit.
Overcurrent protection circuit supervises the inductor peak current in each switching cycle, and if the current
exceeds the LX current limit (ILXLIM), it turns off P-channel Tr. Latch type protection circuit latches the built-in driver
to the OFF state and stops the operation of the step-down DC/DC converter if the overcurrent status continues or
VOUT continues being the half of the setting voltage for equal or longer than protection delay time (tprot). To cancel
the latch type protection circuit, select the standby mode or the active mode with the CE pin, or drop the power
supply voltage below the UVLO detector threshold.
The RP504x is offered in 6-pin DFN(PLP)1216-6F, 6-pin DFN1616-6B and 5-pin SOT-23-5 packages which
achieve the smallest possible footprint solution on boards where area is limited.
*1 This is an approximate value. The output current is dependent on conditions and external components.
1
RP504x
NO.EA-259-150130
FEATURES
Supply Current...................................................... Typ. 25 µA in VFM mode without any load
Standby Current.................................................... Max. 5 µA
Input Voltage Range ............................................. 2.3 V to 5.5 V (VOUT ≥ 1.0 V)
Output Voltage Range........................................... 0.8 V to 3.3 V in 0.1 V step
Output Voltage Accuracy....................................... ±1.5% (VOUT 1.2 V), ±18 mV (VOUT < 1.2 V)
Temperature-Drift Coefficient of Output Voltage... Typ. ±40 ppm/°C
Oscillator Frequency............................................. Typ. 2.25 MHz
Oscillator Maximum Duty Cycle............................ Min. 100%
Built-in Driver ON Resistance ............................... Typ. Pch. 0.34 Ω, Nch. 0.43 Ω (VIN = 3.6 V)
UVLO Detector Threshold..................................... Typ. 2.0 V
Soft Start Time ...................................................... Typ. 0.15 ms
LX Current Limit..................................................... Typ. 900 mA
Latch-type Protection Circuit................................. Typ. 1.5 ms
Auto-discharge Function....................................... Only for RP504xxxxD
Power Controlling Method..................................... forced PWM control or PWM/VFM auto switching control
MODE Pin*1 ........................................................... “H”: forced PWM control,
“L”: PWM/VFM auto switching control
Package*1 .............................................................. DFN1616-6B, DFN(PLP)1216-6F, SOT-23-5
*1 DFN(PLP)1216-6F, DFN1616-6B: forced PWM control by pulling MODE pin “H” or PWM/VFM auto switching control by
pulling MODE pin “L”
SOT-23-5: forced PWM control for RP504xxxxC and PWM/VFM auto switching control for RP504xxxxB
APPLICATIONS
Power source for battery-powered equipment.
Power source for hand-held communication equipment, cameras, VCRs, camcorders.
Power source for HDD, portable equipment.
2
RP504x
NO.EA-259-150130
BLOCK DIAGRAMS
VIN
CURRENT
CHIP
ENABLE
RAMP
COMPENSATION
CE
FEEDBACK
OSCILLATOR
CURRENT
PROTECTION
Lx
VREF
SWITCHING
CONTROL
PWM
VOUT
SOFT
START
UVLO
MODE
GND
RP504xxxxA Block Diagram
VIN
CE
CURRENT
CHIP
ENABLE
RAMP
COMPENSATION
FEEDBACK
OSCILLATOR
CURRENT
PROTECTION
Lx
VREF
SWITCHING
CONTROL
PWM
VOUT
SOFT
START
UVLO
MODE
GND
RP504xxxxB Block Diagram
3
RP504x
NO.EA-259-150130
VIN
CE
CURRENT
RAMP
COMPENSATION
CHIP
ENABLE
FEEDBACK
OSCILLATOR
CURRENT
PROTECTION
Lx
VREF
SWITCHING
CONTROL
PWM
SOFT
START
VOUT
UVLO
MODE
GND
RP504xxxxC Block Diagram
VIN
CHIP
ENABLE
RAMP
COMPENSATION
CURRENT
FEEDBACK
CE
OSCILLATOR
CURRENT
PROTECTION
LX
VREF
SWITCHING
CONTROL
PWM
VOUT
SOFT
START
UVLO
MODE
GND
RP504xxxxD Block Diagram
4
RP504x
NO.EA-259-150130
SELECTION GUIDE
The set output voltage, the package type, the MODE control pin function and the auto-discharge*1 function
are user-selectable options.
Product Name
RP504Kxx1$-E2
RP504Lxx1$-TR
Package
DFN(PLP)1216-6F
DFN1616-6B
Quantity per Reel
5,000 pcs
Pb Free
Yes
Halogen Free
Yes
Yes
Yes
5,000 pcs
Yes
RP504Nxx1$-TR-FE SOT-23-5
3,000 pcs
Yes
xx: Specify the set output voltage (VSET) within the range of 0.8 V(08) to 3.3 V(33) in 0.1 V steps.
Refer to the section of PACKAGE INFORMATION for detailed information.
$: Specify the package type, the MODE control pin function and the auto-discharge function.
MODE Control Pin Function
Power Controlling Method
Auto-discharge
Function
Package
$
A
MODE Pin
DFN1616-6B
DFN(PLP)1216-6F
SOT-23-5
“H”: forced PWM
“L”: PWM/VFM auto switching control
Yes
No
B
C
No
No
PWM/VFM auto switching control
forced PWM control
No
No
SOT-23-5
DFN1616-6B
DFN(PLP)1216-6F
“H”: forced PWM control
“L”: PWM/VFM auto switching control
D
Yes
Yes
*1 Auto-discharge function quickly lowers the output voltage to 0 V, when the chip enable signal is switched from the
active mode to the standby mode, by releasing the electrical charge accumulated in the external capacitor.
*2 0.05 V step is also available as a custom code.
5
RP504x
NO.EA-259-150130
PIN DESCRIPTION
6
5
4
5
4
6
5
4
1
2
3
1
2
3
1
2
3
DFN(PLP)1216-6F Pin Configurations DFN1616-6B Pin Configurations
RP504Kxx1A, RP504Kxx1D: DFN(PLP)1216-6F Pin Description
SOT-23-5 Pin Configurations
Pin No.
Symbol
Description
1
VIN
Input Pin
Mode Control Pin
2
MODE
(“H”: forced PWM control, “L”: PWM/VFM auto switching
control)
3
4
5
6
CE
VOUT
GND
LX
Chip Enable Pin (Active-high)
Output Pin
Ground Pin
LX Switching Pin
RP504Lxx1A, RP504Lxx1D: DFN1616-6B Pin Description
Pin No.
Symbol
Description
Chip Enable Pin (Active-high)
1
CE
Mode Control Pin
2
MODE
(“H”: forced PWM control, “L”: PWM/VFM auto switching
control)
3
4
5
6
VIN
LX
Input Pin
LX Switching Pin
Ground Pin
Output Pin
GND
VOUT
The tab on the bottom of the package enhances thermal performance and is electrically connected to GND (substrate
level). It is recommended that the tab be connected to the ground plane on the board. If not, the tab can be left open.
RP504Nxx1B, RP504Nxx1C: SOT-23-5 Pin Description
Pin No.
Symbol
VOUT
GND
LX
Description
1
2
3
4
5
Output Pin
Ground Pin
LX Switching Pin
Input Pin
VIN
CE
Chip Enable Pin (Active-high)
6
RP504x
NO.EA-259-150130
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings
(GND = 0 V)
Symbol
VIN
Item
VIN Input Voltage
Rating
−0.3 to 6.5
−0.3 to VIN +0.3
−0.3 to 6.5
−0.3 to 6.5
−0.3 to 6.5
900
Unit
V
V
VLX
LX Pin Voltage
VCE
CE Pin Input Voltage
Mode Control Pin Voltage
VOUT Pin Voltage
V
VMODE
VOUT
ILX
V
V
LX Pin Output Current
mA
DFN(PLP)1216-6F
385
640
420
Power Dissipation
PD
DFN1616-6B
SOT-23-5
mW
(Standard Land Pattern)*1
Ta
Operating Temperature Range
Storage Temperature Range
−40 to 85
°C
°C
Tstg
−55 to 125
*1 Refer to PACKAGE INFORMATION for detailed information.
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent
damages and may degrade the life time and safety for both device and system using the device in the field. The
functional operation at or over these absolute maximum ratings is not assured.
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the recommended
operating conditions, even if when they are used over such conditions by momentary electronic noise or surge.
And the semiconductor devices may receive serious damage when they continue to operate over the
recommended operating conditions.
7
RP504x
NO.EA-259-150130
ELECTRICAL CHARACTERISTICS
RP504xxx1A, RP504xxx1D Electrical Characteristics
(Ta = 25°C)
Symbol
Item
Conditions
Min.
2.3
Typ.
Max.
5.5
Unit
V
OUT ≥ 1.0
VIN
Operating Input Voltage
V
VOUT < 1.0
2.3
4.5
VOUT ≥ 1.2 V
x0.985
−0.018
x1.015
+0.018
VIN = VCE = 3.6 V
or VSET +1 V
VOUT
Output Voltage
V
VOUT < 1.2 V
Output Voltage Temperature
Coefficient
−40°C ≤ Ta ≤ 85°C
±40
2.25
400
ppm/°C
MHz
VOUT/Ta
fosc
Oscillator Frequency
Supply Current 1
VIN = VCE = 3.6 V or VSET +1 V
1.95
2.55
800
VIN = VCE = 5.5 V, VOUT = VSET
0.8
IDD1
IDD2
A
A
VMODE = 0 V
25
400
0
40
800
5
VIN = VCE = VOUT
= 5.5 V
Supply Current 2
VMODE = 5.5 V
Istandby
ICEH
Standby Current
VIN = 5.5 V, VCE = 0 V
VIN = VCE = 5.5 V
A
A
A
A
A
A
A
A
A
V
CE "H" Input Voltage
CE "L" Input Voltage
Mode "H" Input Current
Mode "L" Input Current
VOUT "H" Input Current*1
VOUT "L" Input Current
LX Leakage Current "H"
LX Leakage Current "L"
CE "H" Input Voltage
CE "L" Input Voltage
Mode ”H” Input Voltage
Mode ”L” Input Voltage
Nch On Resistance*2
On Resistance of Pch Tr.
On Resistance of Nch Tr.
−1
−1
−1
−1
−1
−1
−1
−5
1.0
0
1
ICEL
VIN = 5.5 V, VCE = 0 V
VIN = VMODE = 5.5 V
VIN = 5.5 V, VMODE = 0 V
VIN = VOUT = 5.5 V, VCE = 0 V
VIN = 5.5 V, VCE = VOUT = 0 V
VIN = VLX = 5.5 V, VCE = 0 V
VIN = 5.5 V, VCE = VLX = 0 V
VIN = 5.5 V
0
1
IMODEH
IMODEL
IVOUTH
IVOUTL
ILXLEAKH
ILXLEAKL
VCEH
0
1
0
1
0
1
0
1
0
5
0
1
VCEL
VIN = 2.3 V
0.4
0.4
V
VMODEH
VMODEL
RLOW
VIN = 5.5 V
1.0
V
VIN = 2.3 V
V
VIN = 3.6 V, VCE = 0 V
VIN = 3.6 V, ILX = −100 mA
VIN = 3.6 V, ILX = −100 mA
30
ꢀ
RONP
0.34
0.43
ꢀ
RONN
ꢀ
Oscillator Maximum Duty
Cycle
Maxduty
100
%
tstart
ILXLIM
Soft-start Time
VIN = VCE = 3.6 V or VSET +1 V
VIN = VCE = 3.6 V or VSET +1 V
VIN = VCE = 3.6 V or VSET +1 V
150
900
1.5
2.0
2.1
310
s
mA
ms
V
Lx Current Limit
700
0.5
1.9
2.0
tprot
Protection Delay Time
5
VUVLO1
VUVLO2
UVLO Detector Threshold VIN = VCE
UVLO Released Voltage VIN = VCE
2.1
2.2
V
All test items listed under ELECTRICAL CHARACTERISTICS are done under the pulse load condition (Tj ≈ Ta = 25°C) except
Output Voltage Temperature Coefficient.
Test circuit is "OPEN LOOP" and AGND = PGND = 0 V unless otherwise specified.
*1 Only for RP504xxx1A/B/C with no auto-discharge
*2 Only for RP504xxx1D with auto-discharge
8
RP504x
NO.EA-259-150130
RP504xxxxB, RP504xxxxC Electrical Characteristics
(Ta = 25°C)
Symbol
Item
Conditions
Min.
2.3
Typ.
Max.
5.5
Unit
V
OUT ≥ 1.0
VIN
Operating Input Voltage
V
VOUT < 1.0
2.3
4.5
VOUT ≥ 1.2 V
x0.985
x1.015
+0.018
VIN = VCE = 3.6 V
or VSET +1 V
VOUT
Output Voltage
V
VOUT < 1.2 V −0.018
Output Voltage Temperature
Coefficient
−40°C ≤ Ta ≤ 85°C
ppm/°C
MHz
VOUT/Ta
40
fosc
Oscillator Frequency
Supply Current 1
VIN = VCE = 3.6 V or VSET +1 V
VIN = VCE = 5.5 V,
1.95
2.25
2.55
800
IDD1
IDD2
400
A
A
VOUT = VSET 0.8
RP504xxx1B
RP504xxx1C
25
400
0
40
800
5
VIN = VCE = VOUT
= 5.5 V
Supply Current 2
Istandby
ICEH
Standby Current
VIN = 5.5 V, VCE = 0 V
VIN = VCE = 5.5 V
A
A
A
A
A
A
A
V
CE "H" Input Voltage
CE "L" Input Voltage
VOUT "H" Input Current
VOUT "L" Input Current
LX Leakage Current "H"
LX Leakage Current "L"
CE "H" Input Voltage
CE "L" Input Voltage
On Resistance of Pch Tr.
On Resistance of Nch Tr.
−1
−1
−1
−1
−1
−5
1.0
0
1
ICEL
VIN = 5.5 V, VCE = 0 V
VIN = VOUT = 5.5 V, VCE = 0 V
VIN = 5.5 V, VCE = VOUT = 0 V
VIN = VLX = 5.5 V, VCE = 0 V
VIN = 5.5 V, VCE = VLX = 0 V
VIN = 5.5 V
0
1
IVOUTH
IVOUTL
ILXLEAKH
ILXLEAKL
VCEH
0
1
0
1
0
5
0
1
VCEL
VIN =2.3 V
0.4
V
RONP
VIN =3.6 V, ILX = −100 mA
VIN =3.6 V, ILX = −100 mA
0.34
0.43
ꢀ
RONN
ꢀ
Oscillator Maximum Duty
Cycle
Maxduty
100
%
tstart
ILXLIM
Soft-start Time
VIN = VCE = 3.6 V or VSET +1 V
VIN = VCE = 3.6 V or VSET +1 V
VIN = VCE = 3.6 V or VSET +1 V
150
900
1.5
2.0
2.1
310
s
mA
ms
V
LX Current Limit
700
0.5
1.9
2.0
tprot
Protection Delay Time
5
VUVLO1
VUVLO2
UVLO Detector Threshold VIN = VCE
UVLO Released Voltage VIN = VCE
2.1
2.2
V
All test items listed under ELECTRICAL CHARACTERISTICS are done under the pulse load condition (Tj ≈ Ta = 25°C) except
Output Voltage Temperature Coefficient.
Test circuit is "OPEN LOOP" and AGND = PGND = 0 V unless otherwise specified.
9
RP504x
NO.EA-259-150130
TYPICAL APPLICATION
VOUT
GND
LX
CE
Control
RP504N
Load
VIN
VIN
COUT 4.7F
L 2.2H
CIN 2.2F
RP504N Typical Application: MODE Pin not included
VOUT
CE
Control
Control
RP504L/K
*1
GND
LX
MODE
Load
VIN
VIN
COUT 4.7F
L 2.2H
CIN 2.2F
RP504K/L Typical Application: MODE Pin included
*1 MODE = “H”: forced PWM control, MODE = “L”: PWM/VFM auto switching control
Recommended Components
Symbol
Capacitance
Type
Manufacturer
2.2 µF
C1608JB0J225K(TDK)
C1005JB0J225K (TDK)
JMK105BJ225MV (Taiyo Yuden)
2.2 µF x 2
4.7 µF
CIN
Ceramic Capacitor
C1005X5R0J475M (TDK)
JMK105BJ475MV (Taiyo Yuden)
C1608JB0J475K (TDK)
GRM188B30J475KE18 (Murata)
COUT
4.7 µF
Ceramic Capacitor
Inductor
MIPSZ2520D2R2 (FDK)
MIPS2520D2R2 (FDK)
MLP2520S2R2M (TDK)
VLS252010T-2R2M (TDK)
L
2.2 µH
10
RP504x
NO.EA-259-150130
TECHNICAL NOTES
The performance of power supply circuits using this IC largely depends on the peripheral circuits. Please be very
careful when setting the peripheral parts. When designing the peripheral circuits of each part, PCB patterns, and
this IC, please do not exceed the rated values (Voltage, Current, Power).
Ensure the VIN and GND lines are sufficiently robust. A large switching current flows through the GND lines,
the VDD line, the VOUT line, an inductor, and LX. If their impedance is too high, noise pickup or unstable
operation may result. Set the external components as close as possible to the IC and minimize the wiring
between the components and the IC, especially between a capacitor (CIN) and the VIN pin. The wiring between
VOUT and load and between L and VOUT should be separated.
Choose a low ESR ceramic capacitor. The capacitance of CIN should be more than or equal to 2.2 µF. The
capacitance of a capacitor (COUT) should be between 4.7 µF to 10 µF.
The Inductance value should be set within the range of 2.2 µH to 4.7 µH. However, the inductance value is
limited by output voltage. Refer to the table below. The phase compensation of this IC is designed according
to the COUT and L values. Choose an inductor that has small DC resistance, has enough allowable current
and is hard to cause magnetic saturation. If the inductance value of an inductor is extremely small, the peak
current of LX may increase. The increased LX peak current reaches “LX limit current” to trigger overcurrent
protection circuit even if the load current is less than 600 mA.
Overcurrent protection circuit, Latch-type protection circuit may be affected by self-heating and heat radiation
environment.
11
RP504x
NO.EA-259-150130
OPERATION OF STEP-DOWN CONVERTER AND OUTPUT CURENT
The step-down DC/DC converter charges energy in the inductor when LX Tr. turns “ON”, and discharges the
energy from the inductor when LX Tr. turns “OFF” and operates with less energy loss, so that a lower output
voltage (VOUT) than the input voltage (VIN) can be obtained. The operation of the step-down DC/DC converter is
explained in the following figures.
IL
ILmax
i1
V
IN
VOUT
ILmin
L
topen
Pch Tr
Nch Tr
i1
i2
i2
CL
GND
ton
toff
T＝1/fosc
Figure 1. Basic Circuit
Figure 2. Inductor Current (IL) flowing through Inductor
Step1. P-channel Tr. turns “ON” and IL (i1) flows, L is charged with energy. At this moment, i1 increases from
the minimum inductor current (ILmin), which is 0 A, and reaches the maximum inductor current (ILmax)
in proportion to the on-time period (ton) of P-channel Tr.
Step2. When P-channel Tr. turns “OFF”, L tries to maintain IL at ILmax, so L turns N-channel Tr. “ON” and IL
(i2) flows into L.
Step3. i2 decreases gradually and reaches ILmin after the open-time period (topen) of N-channel Tr., and then
N-channel Tr. turns “OFF”. This is called discontinuous current mode.
As the output current (IOUT) increases, the off-time period (toff) of P-channel Tr. runs out before IL reaches
ILmin. The next cycle starts, and P-channel Tr. turns “ON” and N-channel Tr. turns “OFF”, which means
IL starts increasing from ILmin. This is called continuous current mode.
In the case of PWM mode, VOUT is maintained by controlling ton. During the PWM mode, the oscillator frequency
(fosc) is constantly maintained.
As shown in Figure 2, when the step-down DC/DC operation is constant, ILmin and ILmax during ton of P-channel
Tr. would be the same as ILmin and ILmax during toff of the P-channel Tr.
The current differential between ILmax and ILmin is described as I.
I = ILmax − ILMIN = VOUT topen / L = (VIN − VOUT) ton / L....................................... Equation 1
However,
T = 1 / fosc = ton + toff
Duty (%) = ton / T 100 = ton fosc 100
topen ≤ toff
In Equation 1, “VOUT topen / L” shows the amount of current change in “OFF” state. Also, “(VIN − VOUT) ton /
L” shows the amount of current change at “ON” state.
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RP504x
NO.EA-259-150130
DISCONTINUOUS MODE AND CONTINUOUS MODE
As illustrated in Figure 3., when IOUT is relatively small, topen < toff. In this case, the energy charged into L during
ton will be completely discharged during toff, as a result, ILMIN = 0. This is called discontinuous mode.
When IOUT is gradually increased, eventually topen = toff and when IOUT is increased further, eventually ILMIN > 0.
This is called continuous mode.
ILMAX
IL
IL
ILMAX
ILMIN
ILMIN
topen
ICONST
t
t
ton
toff
ton
T = 1 / fosc
toff
T = 1 / fosc
Figure 3. Discontinuous Mode
Figure 4. Continuous Mode
In the continuous mode, the solution of Equation 1 is described as tonc.
tonc = T VOUT / VIN ............................................................................................................... Equation 2
When ton < tonc, it indicates discontinuous mode, and when ton = tonc, it indicates continuous mode.
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RP504x
NO.EA-259-150130
OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS
The following equations explain the relationship between output current and peripheral components used in the
diagrams in TYPICAL APPLICATIONS.
Ripple Current P-P value is described as IRP, ON resistance of P-channel Tr. is described as RONP, ON
resistance of N-channel Tr. is described as RONN, and DC resistor of the inductor is described as RL.
VIN = VOUT + (RONP + RL) IOUT + L IRP / ton.............................................................. Equation 3
Second, when P-channel Tr. is “OFF” (N-channel Tr. Is “ON”), the following equation is satisfied.
L IRP / toff = RONN IOUT + VOUT + RL IOUT ............................................................... Equation 4
Put Equation 4 into Equation 3 to solve ON duty of P-channel Tr. (DON = ton / (toff + ton)):
D
ON = (VOUT + RONN IOUT + RL IOUT) / (VIN + RONN IOUT − RONP IOUT)................... Equation 5
Ripple Current is described as follows:
IRP = (VIN − VOUT − RONP IOUT − RL IOUT) DON / fosc / L ......................................... Equation 6
Peak current that flows through L, and LX Tr. is described as follows:
ILXMAX = IOUT + IRP / 2 .................................................................................................... Equation 7
Consider ILXMAX when setting conditions of input and output, as well as selecting the external components.
The above calculation formulas are based on the ideal operation of the ICS in continuous mode.
14
RP504x
NO.EA-259-150130
TIMING CHART
SOFT-START TIME
Starting-up with CE Pin
The IC starts to operate when the CE pin voltage (VCE) exceeds the threshold voltage. The threshold voltage is
preset between CE “H” input voltage (VCEH) and CE “L” input voltage (VCEL).
After the start-up of the IC, soft-start circuit starts to operate. Then, after a certain period of time, the reference
voltage (VREF) in the IC gradually increases up to the specified value.
VCEH
Threshold Level
VCEL
CE Pin Input Voltage
Soft-start Time
(VCE
IC Internal Reference Voltage
(VREF
)
)
Soft-start Circuit
operation starts.
Lx Voltage
(VLX)
IC operates with PWM mode
during Soft-start time.
Output Voltage
(VOUT
)
Depending on Power Supply,
Load Current, External Components
Soft-start time starts when soft-start circuit is activated, and ends when the reference voltage reaches the
specified voltage.
Soft start time is not always equal to the turn-on speed of the step-down DC/DC converter. Please note that the
turn-on speed could be affected by the power supply capacity, the output current, the inductance value and the
C
OUT value.
Starting-up with Power Supply
After the power-on, when VIN exceeds the UVLO released voltage (VUVLO2), the IC starts to operate. Then, soft-
start circuit starts to operate and after a certain period of time, VREF gradually increases up to the specified value.
Soft-start time starts when soft-start circuit is activated, and ends when VREF reaches the specified voltage.
VSET
VUVLO2
Input Voltage
(VIN)
VUVLO1
Soft-start Time
IC Internal Reference Voltage
(VREF
)
Lx Voltage
(VLX
)
IC operates with PWM mode during Soft-start time.
VSET
Output Voltage
Depending on Power Supply, Load Current,
External Components
(VOUT
)
Please note that the turn-on speed of VOUT could be affected by the power supply capacity, the output current,
the inductance value, the COUT value and the turn-on speed of VIN determined by CIN.
15
RP504x
NO.EA-259-150130
Under Voltage Lockout (UVLO) Circuit
If VIN becomes lower than VSET, the step-down DC/DC converter stops the switching operation and ON duty
becomes 100%, and then VOUT gradually drops according to VIN.
If the VIN becomes lower than the UVLO detector threshold (VUVLO1), the UVLO circuit starts to operate, VREF
stops, and P-channel and N-channel built-in switch transistors turn “OFF”. As a result, VOUT drops according to
the COUT capacitance value and the load.
To restart the operation, VIN needs to be higher than VUVLO2. The timing chart below shows the voltage shifts of
VREF, VLX and VOUT when VIN value is varied.
VSET
Input Voltage
VUVLO2
VUVLO1
(VIN)
Soft-start Time
IC Internal Reference Voltage
(VREF
)
Lx Voltage
(VLX)
Output Voltage
VSET
(VOUT
)
Depending on Power Supply, Load Current,
External Components
Falling edge (operating) and rising edge (releasing) waveforms of VOUT could be affected by the initial voltage
of COUT and the output current of VOUT
.
16
RP504x
NO.EA-259-150130
Overcurrent Protection Circuit, Latch Type Protection Circuit
Overcurrent protection circuit supervises the inductor peak current (the peak current flowing through Pch Tr.) in
each switching cycle, and if the current exceeds the LX current limit (ILXLIM), it turns off Pch Tr. ILXLIM of the RP504x
is set to Typ.900 mA.
Latch type protection circuit latches the built-in driver to the OFF state and stops the operation of the step-down
DC/DC converter if the overcurrent status continues or VOUT continues being the half of the setting voltage for
equal or longer than protection delay time (tprot).
Please note that ILXLIM and tprot could be easily affected by self-heating or ambient environment. If the VIN drops
dramatically or becomes unstable due to short-circuit, protection operation and tprot could be affected.
Protection Delay Time (tprot)
Lx Current
Lx Current Limit (ILXlim)
Pch Tr. Current
Lx Voltage
(VLX)
To release the latch type protection circuit, restart the IC by inputting "L" signal to the CE pin, or restart the IC
with power-on or make the supply voltage lower than VUVLO1
.
The timing chart below shows the voltage shift of VCE, VLX and VOUT when the IC status is changed by the
following orders: VIN rising → stable operation → high load → CE reset → stable operation → VIN falling → VIN
recovering (UVLO reset) → stable operation.
(1)(2) If the large current flows through the circuit or if the IC goes into low VOUT condition due to short-circuit or
other reasons, the latch type protection circuit latches the built-in driver to “OFF” state after tprot. Then, VLX
becomes "L" and VOUT turns “OFF”.
(3) The latch type protection circuit is released by CE reset, which puts the IC into "L" once with the CE pin and
back into "H".
(4) The latch type protection circuit is released by UVLO reset, which makes VIN lower than VUVLO1
.
(1) (3) (2)
(4)
VSET
Input Voltage
UVLOReleased Voltage (VUVLO2)
UVLODetector Threshold (VUVLO1)
IN
(V )
UVLO Reset
CE Pin
Input Voltage
VSET
CE Reset
Protection Delay Time Protection Delay Time
Threshold Level
CE
(V )
VSET
Lx Voltage
LX
(V )
Latch-type Protection
Latch-type Protection
VSET
Output Voltage
(VOUT
Stable
Operation
Stable
Operation
Stable
Operation
)
Soft-start Time Soft-start Time
Soft-start Time
17
RP504x
NO.EA-259-150130
PACKAGE INFORMATION
POWER DISSIPATION (DFN(PLP)1216-6F)
Power Dissipation (PD) of the package is dependent on PCB material, layout, and environmental conditions.
The following conditions are used in this measurement.
Measurement Conditions
Standard Land Pattern
Environment
Board Material
Board Dimensions
Copper Ratio
Mounting on Board (Wind Velocity = 0 m/s)
Glass Cloth Epoxy Plastic (Double-sided)
40 mm x 40 mm x 1.6 mm
Topside: Approx. 50%, Backside: Approx. 50%
0.3 mm x 26 pcs
Through-holes
Measurement Result
(Ta = 25C, Tjmax = 125C)
Standard Land Pattern
Power Dissipation
385 mW
ja = (125 − 25 °C) / 0.385W = 260 °C/W
jc = 30°C/W
Thermal Resistance
700
600
40
On Board
500
400
300
200
100
0
385
0
25
50
75 85 100
125
IC Mount Area (Unit: mm)
Ambient Temperature (C)
Power Dissipation vs. Ambient Temperature
Measurement Board Pattern
18
RP504x
NO.EA-259-150130
PACKAGE DIMENSIONS (DFN(PLP)1216-6F)
0.340.05
0.300.05
0.05 M AB
0.300.05
1.60
B
0.150.025
A
4
5
2
6
1
x4
0.05
INDEX
3
0.020.05
0.50 0.50
C0.10
Bottom View
0.05 S
S
(Unit : mm)
DFN(PLP)1216-6F Package Dimensions
MARK SPECIFICATION (DFN(PLP)1216-6F)
: Product Code … Refer to MARK SPECIFICATION TABLE (DFN(PLP)1216-6F).
: Lot Number … Alphanumeric Serial Number
DFN(PLP)1216-6F Mark Specification
19
RP504x
NO.EA-259-150130
MARK SPECIFICATION TABLE (DFN(PLP)1216-6F)
RP504K
Product Name
RP504K081A
RP504K091A
RP504K101A
RP504K111A
RP504K121A
RP504K131A
RP504K141A
RP504K151A
RP504K161A
RP504K171A
RP504K181A
RP504K191A
RP504K201A
RP504K211A
RP504K221A
RP504K231A
RP504K241A
RP504K251A
RP504K261A
RP504K271A
RP504K281A
RP504K291A
RP504K301A
RP504K311A
RP504K321A
RP504K331A
RP504K121A5
RP504K131A5
RP504K121A2
RP504K101A5
D A 0 8
D A 0 9
D A 1 0
D A 1 1
D A 1 2
D A 1 3
D A 1 4
D A 1 5
D A 1 6
D A 1 7
D A 1 8
D A 1 9
D A 2 0
D A 2 1
D A 2 2
D A 2 3
D A 2 4
D A 2 5
D A 2 6
D A 2 7
D A 2 8
D A 2 9
D A 3 0
D A 3 1
D A 3 2
D A 3 3
D A 0 1
D A 0 2
D A 0 3
D A 0 4
Product Name
RP504K081D
RP504K091D
RP504K101D
RP504K111D
RP504K121D
RP504K131D
RP504K141D
RP504K151D
RP504K161D
RP504K171D
RP504K181D
RP504K191D
RP504K201D
RP504K211D
RP504K221D
RP504K231D
RP504K241D
RP504K251D
RP504K261D
RP504K271D
RP504K281D
RP504K291D
RP504K301D
RP504K311D
RP504K321D
RP504K331D
RP504K121D5
RP504K131D5
RP504K121D2
RP504K101D5
D B 0 8
D B 0 9
D B 1 0
D B 1 1
D B 1 2
D B 1 3
D B 1 4
D B 1 5
D B 1 6
D B 1 7
D B 1 8
D B 1 9
D B 2 0
D B 2 1
D B 2 2
D B 2 3
D B 2 4
D B 2 5
D B 2 6
D B 2 7
D B 2 8
D B 2 9
D B 3 0
D B 3 1
D B 3 2
D B 3 3
D B 0 1
D B 0 2
D B 0 3
D B 0 4
20
RP504x
NO.EA-259-150130
POWER DISSIPATION (DFN1616-6B)
Power Dissipation (PD) of the package is dependent on PCB material, layout, and environmental conditions.
The following conditions are used in this measurement.
Measurement Conditions
Standard Land Pattern
Environment
Board Material
Board Dimensions
Copper Ratio
Mounting on Board (Wind Velocity = 0 m/s)
Glass Cloth Epoxy Plastic (Double-sided)
40 mm x 40 mm x 1.6 mm
Topside: Approx. 50%, Backside: Approx. 50%
0.5 mm x 32 pcs
Through-holes
Measurement Result
(Ta = 25C, Tjmax = 125C)
Standard Land Pattern
Power Dissipation
640 mW
ja = (125 − 25C) / 0.64 W = 156C/W
jc = 23 C/W
Thermal Resistance
700
40
640
600
On Board
500
400
300
200
100
0
40
IC Mount Area (Unit: mm)
85
100 125 150
0
25
50
75
Ambient Temperature (C)
Power Dissipation vs. Ambient Temperature
Measurement Board Pattern
21
RP504x
NO.EA-259-150130
PACKAGE DIMENSIONS (DFN1616-6B)
1.60
1.300.05
B
A
4
6
X4
0.05
INDEX
3
1
0.5
0.200.05
(Unit: mm)
S
*1 The tab on the bottom of the package enhances thermal
performance and is electrically connected to GND
(substrate level). It is recommended that the tab be
connected to the ground plane on the board. If not, the
tab can be left open.
DFN1616-6B Package Dimensions
MARK SPECIFICATION (DFN1616-6B)
: Product Code … Refer to MARK SPECIFICATION TABLE (DFN1616-6B).
: Lot Number … Alphanumeric Serial Number
DFN1616-6B Mark Specification
22
RP504x
NO.EA-259-150130
MARK SPECIFICATION TABLE (DFN1616-6B)
RP504L
Product Name
RP504L081A
RP504L091A
RP504L101A
RP504L111A
RP504L121A
RP504L131A
RP504L141A
RP504L151A
RP504L161A
RP504L171A
RP504L181A
RP504L191A
RP504L201A
RP504L211A
RP504L221A
RP504L231A
RP504L241A
RP504L251A
RP504L261A
RP504L271A
RP504L281A
RP504L291A
RP504L301A
RP504L311A
RP504L321A
RP504L331A
RP504L121A5
RP504L131A5
RP504L121A2
RP504L101A5
A Z 0 8
A Z 0 9
A Z 1 0
A Z 1 1
A Z 1 2
A Z 1 3
A Z 1 4
A Z 1 5
A Z 1 6
A Z 1 7
A Z 1 8
A Z 1 9
A Z 2 0
A Z 2 1
A Z 2 2
A Z 2 3
A Z 2 4
A Z 2 5
A Z 2 6
A Z 2 7
A Z 2 8
A Z 2 9
A Z 3 0
A Z 3 1
A Z 3 2
A Z 3 3
A Z 0 1
A Z 0 2
A Z 0 3
A Z 0 4
Product Name
RP504L081D
RP504L091D
RP504L101D
RP504L111D
RP504L121D
RP504L131D
RP504L141D
RP504L151D
RP504L161D
RP504L171D
RP504L181D
RP504L191D
RP504L201D
RP504L211D
RP504L221D
RP504L231D
RP504L241D
RP504L251D
RP504L261D
RP504L271D
RP504L281D
RP504L291D
RP504L301D
RP504L311D
RP504L321D
RP504L331D
RP504L121D5
RP504L131D5
RP504L121D2
RP504L101D5
C Z 0 8
C Z 0 9
C Z 1 0
C Z 1 1
C Z 1 2
C Z 1 3
C Z 1 4
C Z 1 5
C Z 1 6
C Z 1 7
C Z 1 8
C Z 1 9
C Z 2 0
C Z 2 1
C Z 2 2
C Z 2 3
C Z 2 4
C Z 2 5
C Z 2 6
C Z 2 7
C Z 2 8
C Z 2 9
C Z 3 0
C Z 3 1
C Z 3 2
C Z 3 3
C Z 0 1
C Z 0 2
C Z 0 3
C Z 0 4
23
RP504x
NO.EA-259-150130
POWER DISSIPATION (SOT-23-5)
Power Dissipation (PD) of the package is dependent on PCB material, layout, and environmental conditions.
The following conditions are used in this measurement. This data is taken from SOT-23-6.
Measurement Conditions
Standard Land Pattern
Environment
Board Material
Board Dimensions
Copper Ratio
Mounting on Board (Wind Velocity = 0 m/s)
Glass Cloth Epoxy Plastic (Double-sided)
40 mm x 40 mm x 1.6 mm
Top side: Approx. 50%, Back side: Approx. 50%
0.5 mm x 44 pcs
Through-holes
Measurement Result
(Ta = 25C, Tjmax = 125C)
Standard Land Pattern
Free Air
Power Dissipation
420 mW
250 mW
Thermal Resistance ja = (125 − 25C) / 0.42 W = 238C/W
400C/W
600
40
500
400
300
200
100
On Board
420
250
Free Air
0
0
25
50
75
100
125
150
85
IC Mount Area (Unit: mm)
Ambient Temperature (C)
Power Dissipation vs. Ambient Temperature
Measurement Board Pattern
24
RP504x
NO.EA-259-150130
PACKAGE DIMENSIONS (SOT-23-5)
2.9±0.2
1.9±0.2
1.1±0.1
0.8±0.1
(0.95) (0.95)
5
1
4
3
0～0.1
2
+0.1
0.15 0.05
0.4±0.1
(Unit: mm)
SOT-23-5 Package Dimensions
MARK SPECIFICATION (SOT-23-5)
: Product Code … Refer to MARK SPECIFICATION TABLE (SOT-23-5).
: Lot Number … Alphanumeric Serial Number
5
4
2
1
3
SOT-23-5 Mark Specification
25
RP504x
NO.EA-259-150130
MARK SPECIFICATION TABLE (SOT-23-5)
RP504N
Product Name
RP504N081B
RP504N091B
RP504N101B
RP504N111B
RP504N121B
RP504N131B
RP504N141B
RP504N151B
RP504N161B
RP504N171B
RP504N181B
RP504N191B
RP504N201B
RP504N211B
RP504N221B
RP504N231B
RP504N241B
RP504N251B
RP504N261B
RP504N271B
RP504N281B
RP504N291B
RP504N301B
RP504N311B
RP504N321B
RP504N331B
RP504N121B5
RP504N131B5
Product Name
RP504N081C
RP504N091C
RP504N101C
RP504N111C
RP504N121C
RP504N131C
RP504N141C
RP504N151C
RP504N161C
RP504N171C
RP504N181C
RP504N191C
RP504N201C
RP504N211C
RP504N221C
RP504N231C
RP504N241C
RP504N251C
RP504N261C
RP504N271C
RP504N281C
RP504N291C
RP504N301C
RP504N311C
RP504N321C
RP504N331C
RP504N121C5
RP504N131C5
M 0 8
M 0 9
M 1 0
M 1 1
M 1 2
M 1 3
M 1 4
M 1 5
M 1 6
M 1 7
M 1 8
M 1 9
M 2 0
M 2 1
M 2 2
M 2 3
M 2 4
M 2 5
M 2 6
M 2 7
M 2 8
M 2 9
M 3 0
M 3 1
M 3 2
M 3 3
M 0 1
M 0 2
N 0 8
N 0 9
N 1 0
N 1 1
N 1 2
N 1 3
N 1 4
N 1 5
N 1 6
N 1 7
N 1 8
N 1 9
N 2 0
N 2 1
N 2 2
N 2 3
N 2 4
N 2 5
N 2 6
N 2 7
N 2 8
N 2 9
N 3 0
N 3 1
N 3 2
N 3 3
N 0 1
N 0 2
26
RP504x
NO.EA-259-150130
TYPICAL CHARACTERISTICS
Note: Typical Characteristics are intended to be used as reference data; they are not guaranteed.
1) Output Voltage vs. Output Current
RP504x VOUT = 0.8 V
RP504x VOUT = 0.8 V
MODE = “L”PWM/VFM Auto Switching Control
MODE = “H” Forced PWM Control
0.820
0.820
VIN=3.6V
0.815
VIN=4.5V
0.810
VIN=3.6V
VIN=4.5V
0.815
0.810
0.805
0.800
0.795
0.790
0.785
0.780
0.805
0.800
0.795
0.790
0.785
0.780
0.01
0.1
1
10
100
0
100 200
300 400 500 600
Output Current IOUT (mA)
Output Current IOUT (mA)
RP504x VOUT = 1.2 V
RP504x VOUT = 1.2 V
MODE = “H” Forced PWM Control
MODE = “L”PWM/VFM Auto Switching Control
1.220
1.220
VIN=3.6V
1.215
VIN=5.0V
1.210
VIN=3.6V
VIN=5.0V
1.215
1.210
1.205
1.200
1.195
1.190
1.185
1.180
1.205
1.200
1.195
1.190
1.185
1.180
0.01
0.1
1
10
100
0
100 200
300
400 500
600
Output Current IOUT (mA)
Output Current IOUT (mA)
RP504x VOUT = 1.8 V
RP504x VOUT = 1.8 V
MODE = “L”PWM/VFM Auto Switching Control
MODE = “H” Forced PWM Control
1.830
1.830
VIN=3.6V
VIN=3.6V
1.820
1.810
1.800
1.790
1.780
1.820
1.810
1.800
1.790
1.780
VIN=5.0V
VIN=5.0V
0
100 200 300 400 500 600
Output Current IOUT (mA)
0.01
0.1
1
10
100
Output Current IOUT (mA)
27
RP504x
NO.EA-259-150130
RP504x VOUT = 3.3 V
RP504x VOUT = 3.3 V
MODE = “L”PWM/VFM Auto Switching Control
MODE = “H” Forced PWM Control
3.320
3.320
3.310
3.300
3.290
3.280
3.270
VIN=4.3V
VIN=5.0V
VIN=4.3V
3.310
VIN=5.0V
3.300
3.290
3.280
3.270
0
100 200 300 400 500 600
Output Current IOUT (mA)
0.01
0.1
1
10
100
Output Current IOUT (mA)
2) Output Voltage vs. Input Voltage
RP504x VOUT = 0.8 V
RP504x VOUT = 1.2 V
MODE = “H” Forced PWM Control
MODE = “H” Forced PWM Control
0.820
0.815
0.810
0.805
0.800
1.220
1.215
1.210
1.205
1.200
1.195
1.190
1.185
1.180
IOUT=1mA
0.795
IOUT=1mA
IOUT=50mA
0.790
IOUT=50mA
IOUT=250mA
IOUT=250mA
0.785
0.780
2
2.5
3
3.5
4
4.5
2
2.5
3
3.5
4
4.5
5
5.5
Input Voltage VIN(V)
Input Voltage VIN(V)
RP504x VOUT = 1.8 V
RP504x VOUT = 3.3 V
MODE = “H” Forced PWM Control
MODE = “H” Forced PWM Control
3.35
3.34
3.33
3.32
3.31
3.3
1.83
1.82
1.81
1.8
3.29
3.28
3.27
3.26
3.25
IOUT=1mA
IOUT=1mA
1.79
1.78
1.77
IOUT=50mA
IOUT=250mA
IOUT=50mA
IOUT=250mA
3.5
4
4.5
5
5.5
2
2.5
3
3.5
4
4.5
5
5.5
Input Voltage VIN(V)
Input Voltage VIN(V)
28
RP504x
NO.EA-259-150130
3) Output Voltage vs. Temperature
1.830
1.820
VIN=3.6V
1.810
1.800
1.790
1.780
1.770
-50
-25
0
25
50
75
100
Temperature Ta(°C)
4) Efficiency vs. Output Current
RP504x VOUT = 0.8 V
RP504x VOUT = 1.2 V
IN
MODE
V =5.0V, V
=0V
100
90
80
70
60
50
40
30
20
10
0
100
IN
MODE
V =4.5V, V
=0V
90
IN
MODE
V =3.6V, V
=0V
IN
MODE
V =3.6V, V
=0V
80
70
60
50
40
30
20
10
0
IN
MODE
V =V
=4.5V
IN
V =V
MODE
=5.0V
IN
V =V
MODE
=3.6V
IN
V =V
MODE
=3.6V
0.01
0.1
1
10
OUT
100
(mA)
1000
0.01
0.1
1
10
100
1000
Output Current IOUT (mA)
Output Current I
RP504x VOUT = 1.8 V
RP504x VOUT = 3.3 V
IN
MODE
V =5.0V, V
=0V
=0V
IN
MODE
V =5.0V, V
=0V
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
IN
MODE
V =4.3V, V
IN
MODE
V =3.6V, V
=0V
IN
V =V
MODE
=4.3V
IN
V =V
MODE
=5.0V
IN MODE
V =V
=3.6V
IN
V =V
MODE
=3.6V
0.01
0.1
1
10
100
1000
0.01
0.1
1
10
100
(mA)
1000
OUT
OUT
Output Current I
Output Current I
(mA)
29
RP504x
NO.EA-259-150130
5) Supply Current vs. Temperature
RP504x VOUT = 1.8 V (VIN = 5.5 V)
6) Supply Current vs. Input Voltage
RP504x VOUT = 1.8 V
MODE = “L”PWM/VFM Auto Switching Control
MODE = “L”PWM/VFM Auto Switching Control
40
40
Closed Loop
35
Closed Loop
35
Open Loop
30
Open Loop
30
25
20
15
10
25
20
15
10
-50
-25
0
25
50
75
100
2
2.5
3
3.5
4
4.5
5
5.5
Input Voltage VIN (V)
Temperature Ta(°C)
7) Output Voltage Waveform
RP504x VOUT = 0.8 V (VIN = 3.6 V)
RP504x VOUT = 0.8 V (VIN = 3.6 V)
MODE = “H” Forced PWM Control
OUT
MODE = “L”PWM/VFM Auto Switching Control
OUT
I
=10mA
I
=10mA
0.04
0.03
0.02
0.01
0.00
-0.01
0.04
0.03
0.02
0.01
0.00
-0.01
Output Voltage
IL
Output Voltage
IL
100
50
0
300
200
100
0
-50
-100
10
-100
0
5
10
15
20
0
1
2
3
4
5
6
7
8
9
Time t (µs)
Time t (µs)
RP504x VOUT = 1.2V (VIN = 3.6 V)
MODE = “L”PWM/VFM Auto Switching Control
RP504x VOUT = 1.2 V (VIN = 3.6 V)
MODE = “H” Forced PWM Control
I
OUT=10mA
OUT
I
=10mA
0.04
0.03
0.02
0.01
0.00
-0.01
0.04
0.03
0.02
0.01
0.00
-0.01
Output Voltage
IL
Output Voltage
IL
100
50
0
-50
-100
300
200
100
0
-100
0
1
2
3
4
5
6
7
8
9 10
0
5
10
15
20
Time t (µs)
Time t (µs)
30
RP504x
NO.EA-259-150130
RP504x VOUT = 1.8 V (VIN = 3.6 V)
RP504x VOUT = 1.8 V (VIN = 3.6 V)
MODE = “H” Forced PWM Control
MODE = “L”PWM/VFM Auto Switching Control
I
OUT=10mA
OUT
I
=10mA
0.04
0.03
0.02
0.01
0.00
-0.01
0.04
0.03
0.02
0.01
0.00
-0.01
Output Voltage
IL
Output Voltage
IL
100
50
300
200
100
0
0
-50
-100
-100
0
1
2
3
4
5
6
7
8
9 10
0
5
10
15
20
Time t (µs)
Time t (µs)
RP504x
V
OUT = 3.3 V (VIN = 5.0 V)
RP504x VOUT = 3.3 V (VIN = 5.0 V)
MODE = “H” Forced PWM Control
OUT
MODE = “L”PWM/VFM Auto Switching Control
OUT
I
=10mA
I
=10mA
0.04
0.03
0.02
0.01
0.00
-0.01
0.04
0.03
0.02
0.01
0.00
-0.01
Output Voltage
IL
Output Voltage
IL
200
150
100
50
0
-50
-100
300
200
100
0
-100
0
1
2
3
4
5
6
7
8
9 10
0
5
10
15
20
Time t (µs)
Time t (µs)
8) Frequency vs. Temperature
9) Frequency vs. Input Voltage
2.5
2.4
2.3
2.2
2.1
2
2.5
-40°C
VIN=3.6V
2.4
2.3
2.2
2.1
2
25°C
85°C
-50
-25
0
25
50
75
100
2
2.5
3
3.5
4
4.5
5
5.5
Temperature Ta (°C)
Input Voltage VIN (V)
31
RP504x
NO.EA-259-150130
10) Soft Start Time vs. Temperature
220
210
200
190
180
170
-50
-25
0
25
50
75
100
Temperature Ta(°C)
11) UVLO Detector Threshold / Released Voltage vs. Temperature
UVLO Detector Threshold Voltage UVLO Released Voltage
2.3
2.2
2.1
2.0
1.9
2.3
2.2
2.1
2.0
1.9
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Temperature Ta(°C)
Temperature Ta(°C)
12) CE Input Voltage vs. Temperature
CE “H” Input Voltage (VIN = 5.5 V)
CE “H” Input Voltage (VIN = 2.3 V)
1
0.9
0.8
0.7
0.6
0.5
0.4
1
0.9
0.8
0.7
0.6
0.5
0.4
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Temperature Ta(°C)
Temperature Ta(°C)
32
RP504x
NO.EA-259-150130
13) LX Current Limit vs. Temperature
1000
950
900
850
800
-50
-25
0
25
50
75
100
Temperature Ta(°C)
14) Nch Tr. ON Resistance vs. Temperature
15) Pch Tr. ON Resistance vs. Temperature
0.60
0.50
0.40
0.30
0.20
0.10
0
0.60
0.50
0.40
0.30
0.20
0.10
0
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Temperature Ta(°C)
Temperature Ta(°C)
16) Load Transient Response
RP504x081x (VIN = 3.6 V)
RP504x081x (VIN = 3.6 V)
MODE = “L”PWM/VFM Auto Switching Control
MODE = “L”PWM/VFM Auto Switching Control
400
200
400
200
0
Output Current
1mA-->300mA
0
Output Current
300mA-->1mA
1.00
0.90
0.80
0.70
0.60
1.00
0.90
0.80
0.70
0.60
Output Voltage
Output Voltage
-10
0
10 20 30 40 50 60 70 80 90
Time t (µs)
-100
0
100 200 300 400 500 600 700 800 900
Time t (µs)
33
RP504x
NO.EA-259-150130
RP504x081x (VIN = 3.6 V)
RP504x081x (VIN = 3.6 V)
MODE = “H” Forced PWM Control
MODE = “H” Forced PWM Control
400
200
0
400
200
0
Output Current
1mA-->300mA
Output Current
300mA-->1mA
1.00
0.90
0.80
0.70
0.60
1.00
0.90
0.80
0.70
0.60
Output Voltage
Output Voltage
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
RP504x081x (VIN = 3.6 V)
RP504x081x (VIN = 3.6 V)
600
400
200
0
600
400
200
0
Output Current
200mA-->500mA
Output Current
500mA-->200mA
1.00
0.90
0.80
0.70
0.60
1.00
0.90
0.80
0.70
0.60
Output Voltage
Output Voltage
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
RP504x121x (VIN = 3.6 V)
RP504x121x (VIN = 3.6 V)
MODE = “L”PWM/VFM Auto Switching Control
MODE = “L”PWM/VFM Auto Switching Control
400
200
400
200
0
Output Current
1mA-->300mA
0
Output Current
300mA-->1mA
1.30
1.25
1.20
1.15
1.10
1.30
1.25
1.20
1.15
1.10
Output Voltage
Output Voltage
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
-100
0
100 200 300 400 500 600 700 800 900
Time t (µs)
34
RP504x
NO.EA-259-150130
RP504x121x (VIN = 3.6 V)
RP504x121x (VIN = 3.6 V)
MODE = “H” Forced PWM Control
MODE = “H” Forced PWM Control
400
400
200
0
200
0
Output Current
1mA-->300mA
Output Current
300mA-->1mA
1.30
1.25
1.20
1.15
1.10
1.30
1.25
1.20
1.15
1.10
Output Voltage
Output Voltage
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
RP504x121x (VIN = 3.6 V)
RP504x121x (VIN = 3.6 V)
600
600
400
200
0
400
200
0
Output Current
200mA-->500mA
Output Current
500mA-->200mA
1.30
1.25
1.20
1.15
1.10
1.30
1.25
1.20
1.15
1.10
Output Voltage
Output Voltage
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
RP504x181x (VIN = 3.6 V)
RP504x181x (VIN = 3.6 V)
MODE = “L”PWM/VFM Auto Switching Control
MODE = “L”PWM/VFM Auto Switching Control
400
200
400
200
Output Current
1mA-->300mA
0
Output Current
0
300mA-->1mA
1.90
1.90
1.85
1.80
1.85
1.80
1.75
1.70
Output Voltage
1.75
Output Voltage
1.70
-100
0
100 200 300 400 500 600 700 800 900
Time t (µs)
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
35
RP504x
NO.EA-259-150130
RP504x181x (VIN = 3.6 V)
RP504x181x (VIN = 3.6 V)
MODE = “H” Forced PWM Control
MODE = “H” Forced PWM Control
400
200
0
400
200
0
Output Current
1mA-->300mA
Output Current
300mA-->1mA
1.90
1.85
1.80
1.75
1.70
1.65
1.90
1.85
1.80
1.75
1.70
1.65
Output Voltage
Output Voltage
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
RP504x181x (VIN = 3.6 V)
RP504x181x (VIN = 3.6 V)
600
400
200
0
600
400
200
0
Output Current
500mA-->200mA
Output Current
200mA-->500mA
1.90
1.85
1.80
1.75
1.70
1.65
1.90
1.85
1.80
1.75
1.70
1.65
Output Voltage
Output Voltage
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
RP504x331x (VIN = 5.0 V)
RP504x331x (VIN = 5.0 V)
MODE = “L”PWM/VFM Auto Switching Control
MODE = “L”PWM/VFM Auto Switching Control
400
200
400
200
0
Output Current
1mA-->300mA
0
Output Current
300mA-->1mA
3.50
3.40
3.30
3.20
3.10
3.50
3.40
3.30
Output Voltage
3.20
Output Voltage
3.10
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
-100
0
100 200 300 400 500 600 700 800 900
Time t (µs)
36
RP504x
NO.EA-259-150130
RP504x331x (VIN = 5.0 V)
RP504x331x (VIN = 5.0 V)
MODE = “H” Forced PWM Control
MODE = “H” Forced PWM Control
400
200
0
400
200
0
Output Current
1mA-->300mA
Output Current
300mA-->1mA
3.50
3.40
3.30
3.20
3.10
3.50
3.40
3.30
3.20
3.10
Output Voltage
Output Voltage
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
RP504x331x (VIN = 5.0 V)
RP504x331x (VIN = 5.0 V)
600
400
200
0
600
400
200
0
Output Current
200mA-->500mA
Output Current
500mA-->200mA
3.50
3.40
3.30
3.20
3.10
3.50
3.40
3.30
3.20
3.10
Output Voltage
Output Voltage
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
-10 0 10 20 30 40 50 60 70 80 90
Time t (µs)
17) Mode Switching Waveform
RP504x (VOUT = 1.2 V, IOUT = 1 mA)
RP504x (VOUT = 1.2 V, IOUT = 1 mA)
MODE = “H" --> MODE = “L”
MODE = “L” --> MODE = “H”
5
5
0
Mode Input Voltage
0
Mode Input Voltage
1.30
1.25
1.20
1.15
1.30
1.25
1.20
1.15
Output Voltage
Output Voltage
-100
0
100
200
300
400
-200
0
200
400
600
800
Time t (µs)
Time t (µs)
37
RP504x
NO.EA-259-150130
RP504x (VOUT = 1.8 V, IOUT = 1 mA)
MODE = "L" --> MODE = "H"
RP504x (VOUT = 1.8 V, IOUT = 1 mA)
MODE = "H" --> MODE = "L"
5
5
0
Mode Input Voltage
0
Mode Input Voltage
1.90
1.85
1.80
1.75
1.90
1.85
1.80
1.75
Output Voltage
Output Voltage
-200
0
200
400
600
800
-100
0
100
200
300
400
Time t (µs)
Time t (µs)
38
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, fire containment 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.
Ricoh is committed to reducing the environmental loading materials in electrical devices
with a view to contributing to the protection of human health and the environment.
Ricoh has been providing RoHS compliant products since April 1, 2006 and Halogen-free products since
Halogen Free
April 1, 2012.
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