RP402N502A-TR [RICOH]
Switching Regulator,;
| 型号： | RP402N502A-TR |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Switching Regulator, |
| 文件： | 总43页 (文件大小：2116K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RP402x Series
High Efficiency Small Packaged Step-up DC/DC Converter
No. EA-317-181205
OUTLINE
The RP402x is a high efficiency step-up DC/DC converter with synchronous rectifier. The device can start up
with low voltage of typically 0.7 V which is ideal for the applications powered by either one-cell or two-cell
alkaline, nickel-metal-hydride (NiMH) or one-cell Lithium-ion (Li+) batteries.
Internally, the RP402x 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 protection circuits.
The RP402x is employing synchronous rectification for improving the efficiency or 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.
The RP402x is available in either internally fixed output voltage type or adjustable output voltage type. The
RP402xxxxx is the internally fixed output voltage type. The RP402x00xx is the adjustable output voltage type,
which allows output voltages that range from 1.8 V to 5.5 V via an external divider resistor.
The RP402x provides the forced PWM control and the PWM/VFM auto switching control. Either one of these
can be selected by inputting a signal to the MODE pin. The forced PWM control switches at fixed frequency
rate in low output current in order to reduce noise. Likewise, the PWM/VFM auto switching control automatically
switches from PWM mode to VFM mode in low output current in order to achieve high efficiency. The RP402N
is available in the PWM/VFM auto switching control. However, the RP402N is also available in the forced PWM
control as a custom-designed IC(1).
The RP402x has a soft-start time of typically 0.5 ms.
The RP402x features the complete output disconnect shutdown option and the input-to-output bypass
shutdown option. The RP402xxxxA/ B/ E/ F incorporates the complete output disconnect shutdown option,
which allows the output to be disconnected from the input. The RP402xxxxC/ D/ G/ H incorporates the input-
to-output bypass shutdown option, which allows the output to be connected to the input.
The RP402x is protected against damage by a short-current protection, an over-voltage lockout, an over
voltage protection, an anti-ringing switch and a latch-type protection. An anti-ringing switch prevents the
occurrence of noise when an inductor current reaches a discontinuous mode. The RP402x provides optional
Latch function with current limit detection which can turn off the power in case the limit values are detected for
a fixed time and current limit circuit controls peak inductor currents in every clock. The latch-type protection
can be released by switching the CE pin from high to low while the power is turned on.
The RP402x is offered in a compact 5-pin SOT23-5 package or a 8-pin DFN(PLP)2020-8 package.
(1) As for the custom-designed IC, please contact our sales representatives.
1
RP402x
No. EA-317-181205
FEATURES
Low Voltage Start-up ··································Typ. 0.7 V
Input Voltage Range···································Fixed Output Voltage Type: 0.6 V to 4.8 V
Adjustable Output Voltage Type: 0.6 V to 4.6 V
High Efficiency ··········································94% (100 mA/ 5.0 V, VIN = 3.6 V, 25°C)
90% (1 mA/ 5.0 V, VIN = 3.6 V, 25°C)
Output Current ··········································800 mA: VIN = 3.6 V, VOUT = 5.0 V
LX Driver ON Resistance ·····························NMOS/ PMOS: 0.20 Ω (VOUT = 5.0 V, 25°C)
PWM Oscillator Frequency ··························1.2 MHz (Normal PWM), 1.0 MHz (Forced PWM)
Output Voltage Range·································Fixed Output Voltage Type: 1.8 V to 5.5 V, 0.1 V step
Adjustable Output Voltage Type: 1.8 V to 5.5 V (recommended)
OVLO Detector Threshold ···························Typ. 5.1 V
OVP Detector Threshold ·····························Typ. 6.0 V
LX Peak Current Limit ·································Typ. 1.5 A
Latch Protection Delay Time·························Typ. 3.3 ms (RP402Kxx1x, RP402Nxx1x)
Typ. 4.1 ms (RP402Kxx2x)
Soft-start Time ··········································Typ. 0.5 ms
EMI Suppression (Built-in Anti-ringing Switch) (RP402Kxx1x, RP402Nxx1x)
Voltage Regulation at VIN > VOUT
Zero Input Complete Shutdown at VIN = 0 V
Input-to-Output Bypass Shutdown Option at CE = L (RP402xxxxC/ D/ G/ H)
Ceramic Capacitor Capable
Package ··················································DFN(PLP)2020-8, SOT23-5
APPLICATIONS
MP3 Players, PDA
Digital Still Cameras
LCD Bias Supplies
Portable Blood Pressure Meter
Wireless Handset
GPS
USB-OTG
HDMI
2
RP402x
No. EA-317-181205
SELECTION GUIDE
The package type, the set output voltage, the PWM control type, the shutdown option, the MODE pin option,
and the latch function are user-selectable options.
Selection Guide
Package
DFN(PLP)2020-8
SOT-23-5
Quantity per Reel
5,000 pcs
Pb Free
Yes
Halogen Free
Product Name
RP402Kxx#$-TR
Yes
Yes
RP402Nxx#$-TR-FE
3,000 pcs
Yes
xx: Specify the set output voltage (VSET).
00: Adjustable Output Voltage Type (1.8 V to 5.5 V, recommended voltage range)
xx: Fixed Output Voltage Type (1.8 V to 5.5 V, adjustable in 0.1 V step)
Please note: SOT-23-5 package is only available with fixed output voltage type.
#: Specify the PWM control type.
1: Normal PWM operation
2: Forced PWM operation
$: Specify the combination of the shutdown option, the MODE pin option and the latch function.
Version
Shutdown Options at CE = L
Complete Output Disconnect
Complete Output Disconnect
Input-to-Output Bypass
MODE Pin
Yes
Latch Function
A
B
C
D
E
F
Yes
No
Yes
Yes
Yes
No
Input-to-Output Bypass
Yes
Complete Output Disconnect
Complete Output Disconnect
Input-to-Output Bypass
No
Yes
No
No
G
H
No
Yes
No
Input-to-Output Bypass
No
Please refer to Selection Guide Table on the next page for detailed information.
3
RP402x
No. EA-317-181205
Selection Guide Table
MODE Pin Function
Output
Voltage
Type
Shutdown
Option
at CE = L
PWM
Controlling
Method
Latch
Function
Package
#$
MODE
Pin
Power Controlling Method
“H”: Normal PWM Control,
“L”: PWM/VFM Auto Switching
Control
“H”: Forced PWM Control
Note: “H” recommended
“H”: Normal PWM Control,
“L”: PWM/VFM Auto Switching
Control
“H”: Forced PWM Control
Note: “H” recommended
“H”: Normal PWM Control,
“L”: PWM/VFM Auto Switching
Control
“H”: Normal PWM Control,
“L”: PWM/VFM Auto Switching
Control
“H”: Normal PWM Control,
“L”: PWM/VFM Auto Switching
Control
“H”: Forced PWM Control
Note: “H” recommended
“H”: Normal PWM Control,
“L”: PWM/VFM Auto Switching
Control
“H”: Forced PWM Control
Note: “H” recommended
“H”: Normal PWM Control,
“L”: PWM/VFM Auto Switching
Control
“H”: Normal PWM Control,
“L”: PWM/VFM Auto Switching
Control
Normal
PWM
1A
2A
1B
2B
1C
Yes
No
Forced
PWM
Complete
Output
Disconnect
Normal
PWM
Fixed Output
Voltage Type
Forced
PWM
Normal
PWM
Yes
No
Input-to-
Output
Bypass
Normal
PWM
1D
DFN(PLP)2020-8
Yes
Normal
PWM
1A
2A
1B
2B
1C
Yes
No
Forced
PWM
Complete
Output
Disconnect
Normal
PWM
Adjustable
Output
Voltage
Type
Forced
PWM
Normal
PWM
Yes
No
Input-to-
Output
Bypass
Normal
PWM
1D
Normal
PWM
Normal
PWM
Normal
PWM
Normal
PWM
1E
1F
1G
1H
PWM/VFM Auto Switching Control
PWM/VFM Auto Switching Control
PWM/VFM Auto Switching Control
PWM/VFM Auto Switching Control
Yes
No
Complete
Output
Disconnect
Fixed Output
Voltage Type
SOT-23-5
No
Yes
No
Input-to-
Output
Bypass
4
RP402x
No. EA-317-181205
BLOCK DIAGRAMS
*1
This Bypass Switch is included in the RP402KxxxC / D only.
This Latch Timer is included in the RP402KxxxA / C only.
*2
BYPASS
SW*1
OVER VOLTAGE
PROTECTION
VIN
Lx
VOUT
REVERSE
DETECTOR
VFM
CONTROLLER
OSCILLATOR
MODE
POWER
CONTROLLER
STARTUP
CIRCUIT
BACKGATE
CONTROLLER
VREF
+
-
PWM
CONTROLLER
SOFT
START
SWITCHING
CONTROLLER
CURRENT
CHIP
ENABLE
LATCH
PROTECTION
CE
TIMER*2
SHORT
PROTECTION
RAMP
COMPENSATION
CURRENT
FEEDBACK
＋
GND
RP402Kxxxx Block Diagram
*1 This Bypass Switch is included in the RP402KxxxC / D only.
*2 This Latch Timer is included in the RP402KxxxA / C only.
BYPASS
SW*1
OVER VOLTAGE
PROTECTION
VIN
Lx
VOUT
REVERSE
DETECTOR
VFM
CONTROLLER
OSCILLATOR
MODE
POWER
CONTROLLER
STARTUP
CIRCUIT
BACKGATE
CONTROLLER
VREF
+
-
PWM
CONTROLLER
SOFT
START
SWITCHING
CONTROLLER
CURRENT
PROTECTION
CHIP
LATCH
CE
ENABLE
TIMER*2
SHORT
PROTECTION
VFB
RAMP
COMPENSATION
CURRENT
FEEDBA CK
＋
GND
RP402K00xx Block Diagram
5
RP402x
No. EA-317-181205
*1 This Bypass Switch is included in the RP402NxxxG/ H only.
*2 This Latch Timer is included in the RP402NxxxE/ G only.
BYPASS
SW*1
OVER VOLTAGE
PROTECTION
VIN
Lx
VOUT
REVERSE
DETECTOR
VFM
CONTROLLER
OSCILLATOR
POWER
CONTROLLER
STARTUP
CIRCUIT
BACKGATE
CONTROLLER
VREF
+
-
PWM
CONTROLLER
SOFT
START
SWITCHING
CONTROLLER
CURRENT
CHIP
ENABLE
LATCH
TIMER
PROTECTION
CE
*2
SHORT
PROTECTIO N
RAMP
COMPENSATION
CURRENT
FEEDBACK
＋
GND
RP402Nxxxx Block Diagram
6
RP402x
No. EA-317-181205
PIN DESCRIPTION
Top View
Bottom View
5
4
8
7
6
5
5
6
7
8
1
2
3
1
2
3
4
4
3
2
1
RP402K [DFN(PLP)2020-8] Pin Configurations
RP402N (SOT-23-5) Pin Configurations
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, or otherwise be left floating.
RP402Kxxxx Pin Description
Pin No.
Symbol
MODE
NC
Description
1
2
3
4
5
6
7
8
Mode Pin(1)
No Connection
Ground Pin
GND
Lx
Internal NMOS Switch Drain Pin
Output Pin
VOUT
VIN
Power Supply Pin
NC
No Connection
CE
Chip Enable Pin, Active-high
RP402K00xx Pin Description
Pin No.
Symbol
Description
1
2
3
4
5
6
7
8
MODE
NC
MODE Pin(1)
No Connection
GND
Lx
Ground Pin
Internal NMOS Switch Drain Pin
Output Pin
VOUT
VIN
Power Supply Pin
VFB
Feedback Input Pin for Setting Output Voltage
Chip Enable Pin, Active-high
CE
RP402Nxx1x Pin Description
Pin No.
Symbol
Description
Internal NMOS Switch Drain Pin
Ground Pin
1
2
3
4
5
Lx
GND
CE
Chip Enable Pin, Active-high
Power Supply Pin
VIN
VOUT
Output Pin
(1) MODE Pin = “H” is recommended for RP402Kxx2x.
7
RP402x
No. EA-317-181205
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings
Symbol
VIN
Parameter
Rating
−0.3 to 6.5
−0.3 to 7.0
−0.3 to 6.5
−0.3 to 6.5
−0.3 to 6.5
−0.3 to 6.5
1800
Unit
V
VIN Pin Voltage
VOUT Pin Voltage
LX Pin Voltage
CE Pin Voltage
V
VOUT
VLX
V
V
VCE
V
VFB
VFB Pin Voltage (RP402K00xx only)
MODE Pin Voltage (RP402Kxxxx only)
V
VMODE
Power Dissipation (1)
DFN(PLP)2020-8
SOT-23-5
PD
mW
660
(JEDEC STD. 51-7)
°C
°C
Tj
Junction Temperature Range
−40 to 125
−55 to 125
Tstg
Storage Temperature Range
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
Recommended Operating Conditions
Symbol
VIN
Parameter
Input Voltage
Operating Temperature
Rating
0.6 to 4.8
−40 to 85
Unit
V
Ta
°C
RECOMMENDED OPERATING CONDITIONS
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.
(1) Refer to POWER DISSIPATION for detailed information.
8
RP402x
No. EA-317-181205
ELECTRICAL CHARACTERISTICS
The specifications surrounded by
are guaranteed by design engineering at −40°C ≤ Ta ≤ 85°C.
RP402xxxxx Electrical Characteristics (Not applicable to RP402K00xx)
(Ta = 25°C)
Symbol
Parameter
Condition
Min. Typ. Max. Unit
VSTART
Start-up Voltage
RL = 5.5 kΩ
0.7
0.8
V
V
VHOLD
VOVLO
VOVP
IDD1
Hold-on Voltage after start-up(1)
OVLO Voltage
RL = 5.5 kΩ
-
0.6
4.8
5.1
6.0
1.6
V
OVP Voltage
-
V
VIN = VSET −0.4 V,
Quiescent Current 1
mA
V
OUT = 0.95 x VSET
VIN = VSET −0.4 V,
OUT = VSET + 0.2 V
VIN = 4.8 V, VOUT = 0V,
CE = 0V
IDD2
Quiescent Current 2(2)
21
37
µA
V
RP402xxxxA/ B/ E/ F
RP402xxxxC/ D/ G/ H
0.2
1.2
1.0
V
Istandby
VOUT
Standby Current
µA
V
VIN = 4.8 V, VCE = 0 V
VIN = VCE = 1.5 V
2.5
Output Voltage
Output-Voltage
x0.985
x1.015
ppm
/°C
ΔVOUT
/ΔTa
−40°C ≤ Ta ≤ 85°C
50
1200
1000
Temperature Coefficient
1080
1020
1320
1380
RP402xxx1x
RP402xxx2x
Switching
Frequency
VIN = 1.5 V,
fosc
kHz
VOUT = 0.95 x VSET
900
850
1100
1150
RONN
RONP
NMOS ON Resistance(1)
PMOS ON Resistance(1)
VOUT = 5.0 V
VOUT = 5.0 V
VIN = 4.8 V,
0.20
0.20
Ω
Ω
ICEH
ICEL
CE ”H” Input Current
CE ”L” Input Current
0.5
µA
µA
VOUT = VCE = 5 V
VIN = 4.8 V,
−0.5
−0.5
VOUT = 5 V, VCE = 0 V
V
V
IN = 4.8V,
CE = 0 V,
RP402xxx1x
RP402xxx2x
0.5
72
MODE ”H” Input
Current(3)
IMODEH
µA
VMODE = 5.5 V
VIN = 4.8 V, VCE = VMODE
0 V
=
IMODEL
ILXH
MODE ”L” Input Current(3)
Lx ”H” Leakage Current
µA
µA
VIN = VOUT = VLX = 4.8V,
VCE = 0 V
0.5
0.5
VOUT = 5 V, VLX = 0 V,
VCE = 0 V
ILXL
Lx ”L”Leakage Current
Lx Limit Current(4)
µA
A
ILXPEAK
1.3
1.5
All test items listed under ELECTRICAL CHARACTERISTICS are done under the pulse load condition (Tj ≈ Ta = 25°C).
(1) Hold-on Voltage and NMOS/ PMOS ON Resistance are dependent on VOUT.
(2) Quiescent Current 2 is not applicable to RP402xxx2x.
(3) MODE “H”/ “L” Input Current/ Voltage is only applicable to RP402Kxxxx.
(4) LX Limit Current fluctuates depending on Duty.
9
RP402x
No. EA-317-181205
ELECTRICAL CHARACTERISTICS (continued)
The specifications surrounded by
are guaranteed by design engineering at −40°C ≤ Ta ≤ 85°C.
RP402xxxxx Electrical Characteristics (Not applicable to RP402K00xx)
(Ta = 25°C)
Symbol
Parameter
Condition
Min. Typ. Max. Unit
VCEH
CE ”H” Input Voltage
CE “L” Input Voltage
0.7
V
V
V
V
VCEL
0.3
VMODEH
VMODEL
MODE ”H” Input Voltage (1)
MODE ”L” Input Voltage (1)
1.0
0.4
95
VIN = 1.5 V, VOUT = 0.95
x VSET
Maxduty Oscillator Maximum Duty Cycle
80
88
%
Measures the time when
VCE = 0 V to 1.5 V,
VOUT = VSET x 0.95
tstart
tprot
Soft-start Time(2)
0.25
0.5
0.70
ms
ms
RP402xxx1x
RP402xxx2x
2.7
3.5
3.3
4.1
3.9
4.7
Protection
Time(3)
Delay
RONA
RONB
Anti-ringing Switch ON Resistance(4)
Bypass Switch ON
VIN = 2.5 V, VOUT = 3.3 V
100
Ω
Ω
VIN = 3.0 V,
VOUT = 0 V
RP402xxxxC/ D/ G/ H
160
0.1
Resistance(5)
IINZERO
VIN Zero Current
VIN = 0 V, VOUT = 5.5 V
1.0
µA
All test items listed under ELECTRICAL CHARACTERISTICS are done under the pulse load condition (Tj ≈ Ta = 25°C).
(1) MODE “H”/ “L” Input Current/ Voltage is only applicable to RP402Kxxxx.
(2)
V ≥ 1.7 V
IN
(3) Protection Delay Time is not included in RP402xxxxB/ D/ F/ H.
(4) Anti-ringing Switch ON Resistance is dependent on VOUT. Not applicable to RP402xxx2x.
(5) Bypass Switch ON Resistance is dependent on VIN.
10
RP402x
No. EA-317-181205
Electrical Characteristics by Differenct Output Voltage
VOUT (Ta = 25°C)
Typ.
Product
Name
Min.
Max.
1.827
1.929
2.030
2.132
2.233
2.335
2.436
2.538
2.639
2.741
2.842
2.944
3.045
3.147
3.248
3.350
3.451
3.553
3.654
3.756
3.857
3.959
4.060
4.162
4.263
4.365
4.466
4.568
4.669
4.771
4.872
4.974
5.075
5.177
5.278
5.380
5.481
5.582
RP402x18xx
RP402x19xx
RP402x20xx
RP402x21xx
RP402x22xx
RP402x23xx
RP402x24xx
RP402x25xx
RP402x26xx
RP402x27xx
RP402x28xx
RP402x29xx
RP402x30xx
RP402x31xx
RP402x32xx
RP402x33xx
RP402x34xx
RP402x35xx
RP402x36xx
RP402x37xx
RP402x38xx
RP402x39xx
RP402x40xx
RP402x41xx
RP402x42xx
RP402x43xx
RP402x44xx
RP402x45xx
RP402x46xx
RP402x47xx
RP402x48xx
RP402x49xx
RP402x50xx
RP402x51xx
RP402x52xx
RP402x53xx
RP402x54xx
RP402x55xx
1.773
1.872
1.970
2.069
2.167
2.266
2.364
2.463
2.561
2.660
2.758
2.857
2.955
3.054
3.152
3.251
3.349
3.448
3.546
3.645
3.743
3.842
3.940
4.039
4.137
4.236
4.334
4.433
4.531
4.630
4.728
4.827
4.925
5.024
5.122
5.221
5.319
5.417
1.800
1.900
2.000
2.100
2.200
2.300
2.400
2.500
2.600
2.700
2.800
2.900
3.000
3.100
3.200
3.300
3.400
3.500
3.600
3.700
3.800
3.900
4.000
4.100
4.200
4.300
4.400
4.500
4.600
4.700
4.800
4.900
5.000
5.100
5.200
5.300
5.400
5.500
11
RP402x
No. EA-317-181205
ELECTRICAL CHARACTERISTICS (continued)
The specifications surrounded by
are guaranteed by design engineering at −40°C ≤ Ta ≤ 85°C.
RP402K00xx Electrical Characteristics
(Ta = 25°C)
Symbol
Parameter
Condition
Min.
Typ.
Max.
Unit
VIN
Input Voltage
4.6
0.8
V
VSTART
VHOLD
VOVLO
VOVP
Start-up Voltage
RL = 5.5 kΩ
0.7
V
V
V
V
Hold-on Voltage after start-up(1)
OVLO Voltage
RL = 5.5 kΩ
0.6
4.6
5.1
6.0
1.6
OVP Voltage
VIN = 3 V, VOUT = 5 V,
IDD1
IDD2
Quiescent Current 1
Quiescent Current 2(2)
mA
µA
V
FB = 0.6 V
VIN = 4.8 V, VOUT = 5.5 V,
FB = 2.0 V, VMODE = 0 V
VIN = 4.8 V, VOUT = 0V,
CE = 0V
21
37
V
RP402KxxxA/ B
RP402KxxxC/ D
0.2
1.2
1.0
2.5
V
Istandby Standby Current
µA
V
VIN = 4.8 V, VCE = 0 V
VFB
Feedback Voltage
VIN = 3.0 V, VOUT = 5 V
0.985
1.00
1.015
ppm
/°C
ΔVFB
/ΔTa
Output Voltage Temperature
Coefficient
−40°C ≤ Ta ≤ 85°C
50
1200
1000
1080
1020
1320
1380
RP402K001x
Switching
VIN = 3.0 V, VOUT = 3.3 V,
VFB = 0.6 V
fosc
kHz
Frequency
900
850
1100
1150
RP402K002x
RONN
RONP
NMOS ON Resistance(1)
PMOS ON Resistance(1)
VOUT = 5.0 V
VOUT = 5.0 V
0.20
0.20
Ω
Ω
VIN = 4.8 V, VOUT = VCE
5.5 V
=
ICEH
ICEL
CE ”H” Input Current
CE ”L” Input Current
0.5
µA
µA
VIN = 4.8 V, VOUT = 5 V,
−0.5
−0.5
VCE = 0 V
RP402K001x
RP402K002x
0.5
72
MODE ”H” Input
Current
VIN = 4.8 V, VMODE = 5.5 V,
VCE = 0 V
IMODEH
µA
VIN = 4.8 V, VCE = VMODE
0 V
=
IMODEL
ILXH
MODE ”H” Input Current
Lx ”H” Leakage Current
µA
µA
VIN = VOUT = VLX = 4.8 V,
0.5
0.5
V
CE = 0 V
VOUT = 5.0 V, VLX = 0 V,
CE = 0 V
ILXL
Lx ”L”Leakage Current
Lx Limit Current(3)
µA
A
V
ILXPEAK
1.3
1.5
All test items listed under ELECTRICAL CHARACTERISTICS are done under the pulse load condition (Tj ≈ Ta = 25°C).
(1) Hold-on Voltage and NMOS/ PMOS ON Resistance are dependent on VOUT.
(2) Quiescent Current 2 is not applicable to RP402K002x.
(3) LX Limit Current fluctuates depending on Duty.
12
RP402x
No. EA-317-181205
ELECTRICAL CHARACTERISTICS (continued)
The specifications surrounded by
are guaranteed by design engineering −40°C ≤ Ta ≤ 85°C.
RP402K00xx Electrical Characteristics
(Ta = 25°C)
Symbol
Parameter
Condition
Min. Typ. Max. Unit
VCEH
CE ”H” Input Voltage
0.7
V
V
V
V
VCEL
CE ”L” Input Voltage
0.3
VMODEH
VMODEL
MODE ”H” Input Voltage
MODE ”L” Input Voltage
1.0
0.4
95
VIN = 3.0 V, VOUT = 3.3 V,
Maxduty Oscillator Maximum Duty Cycle
80
88
%
VFB = 0.6 V
Measures the time when
VOUT = 3.3 V,
tstart
Soft-start Time(1)
0.25
0.5
0.70
ms
VCE = 0 V to 1.5 V,
VOUT = 3.13 V
RP402K001x
RP402K002x
-
-
2.7
3.5
3.3
4.1
3.9
4.7
ms
ms
Protection Delay
Time(2)
tprot
RONA
Anti-ringing Switch ON Resistance(3)
Bypass Switch ON
VIN = 2.5 V, VOUT = 3.3 V
VIN = 3.0 V,
100
Ω
RONB
RP402KxxxC/ D
160
0.1
Ω
Resistance(4)
VOUT = 0 V
IINZERO
VIN Zero Current
VIN = 0 V, VOUT = 5.5 V
1.0
µA
All test items listed under ELECTRICAL CHARACTERISTICS are done under the pulse load condition (Tj ≈ Ta = 25°C).
(1) Soft-start Time is VIN ≥ 1.7 V.
(2) Quiescent Current 2 is not applicable to RP402K002x.
(3) LX Limit Current fluctuates depending on Duty.
(4) Bypass Switch ON Resistance is dependent on VIN.
13
RP402x
No. EA-317-181205
THEORY OF OPERATION
Forced PWM Control Type (RP402xx2A/ B)
While normal PWM control type prevents the reverse inductor current at light load, forced PWM control type
makes the inductor current reverse in order to eliminate the discontinuous current period. Therefore, even at
light load or when the voltage difference between input and output is less, forced PWM control type can
provide PWM operation without bursting.
IL
Normal PWM
Lx
IL
Forced PWM
Lx
Operating Waveform of Normal PWM/ Forced PWM Control Type
There is a case that forced PWM control performs burst operation without PWM operation because of the
conditions of use. The conditions which cause burst operation are various and differ in set output voltage, input
voltage, ambient temperature and load current.
Please note that forced PWM control type decreases the efficiency at light load and does not include anti-
ringing switch. The graph below indicates the typical operational maximum input voltage of forced PWM control
type.
RP402Kxx1x: MODE = ”H” (Normal PWM), RP402Kxx2x: (Forced PWM)
RP402K33xx
RP402K18xx
( Ta = 25°C)
( Ta = 25°C)
3.5
3
1.8
1.6
1.4
1.2
1
2.5
2
0.8
0.6
0.4
0.2
0
1.5
1
RP402K331x
RP402K332x
RP402K181x
RP402K182x
0.5
0
1
10
Output Current IOUT [mA]
100
1
10
Output Current IOUT [mA]
100
14
RP402x
No. EA-317-181205
RP402K50xx
RP402K55xx
( Ta = 25°C)
( Ta = 25°C)
5
4.5
4
6
5
4
3
2
1
0
3.5
3
2.5
2
1.5
1
RP402K551x
RP402K552x
RP402K501x
RP402K502x
0.5
0
1
10
Output Current IOUT [mA]
100
1
10
Output Current IOUT [mA]
100
MODE Pin (RP402K only)
When setting the MODE pin “high” of RP402K, it is recommended to connect the MODE pin “high” with the
OUT pin to ensure stability. Please note that a current flows through the pull-down resistor to consume power
V
even in a standby state (CE=”low”) as the MODE pin is pulled down by an internal resistor when the Mode pin
“high” is connected with VIN pin. Since RP402Kxx2A/B have only Forced PWM control type, the MODE pin
“high” fixing is recommended to ensure safety, but also connecting the MODE pin to GND or using it in the
open state are other options.
Bypass Mode Application Example (RP402xxxxC/ D/ G/ H)
The RP402xxxxC/ D/ G/ H is available in bypass mode when CE = L. The shown below is the application
example of the device in bypass mode. In this application, when the main system is not in sleep, the
RP402xxxxC/ D/ G/ H is set to active state to supply power to the main system and RTC. When the main
system is in sleep, the RP 402xxxxC/ D/ G/ H is set to standby state to supply power to RTC in bypass mode.
Using the device in the bypass mode can reduce the power loss and the consumption of battery. Also, using
the device in bypass mode can eliminate external components for short-circuit protection.
L
LX
VIN
Main System
(VSET
C1
)
RP402xxxx
C/ D/ G/ H
VOUT
VOUT
CE
C2
CE Control
RTC
MODE
(A small amount of
current is required.)
GND
15
RP402x
No. EA-317-181205
Regulation Operation at VIN > VOUT
The RP402x regulates the output voltage to the set output voltage even when the input voltage is higher than
the set output voltage. Please note that this regulation operation decreases the efficiency and the maximum
output current driving ability. The maximum output current driving ability can be different due to the set output
voltage, the input voltage and the ambient temperature.
The following is the switching condition (Typ.) from step-up operation to the step-down regulation.
VIN ≤ VOUT−150 mV: Step-down regulation → Step-up operation
VIN > VOUT−100 mV: Step-up operation → Step-down regulation
Output Current vs.Input Voltage
RP402xxxxx
ILX vs.Input Voltage
RP402xxxxx
VOUT = 3.3V
VOUT = 3.3V
500
450
400
350
300
250
200
150
100
50
600
550
500
450
400
350
300
250
200
0
3
3.5
4
4.5
5
5.5
3
3.5
4
4.5
5
Input Voltage VIN [V]
Input Voltage VIN [V]
Output Voltage Setting for RP402K00xx
The RP402K00xx can set the output voltage freely by the external divider resistors using the following equation.
Output Voltage = VFB (R1 + R2) / R2
(VFB = 1.0 V)
Zero Input Complete Shutdown at VIN = 0 V
The RP402x provides a zero input complete shutdown function that allows the device to shut down the output
when VIN = 0 V or VIN = open. This function protects against reverse current flow from VOUT to VIN when a
voltage is applied to the VOUT pin while VIN = 0 V or VIN = open.
Overcurrent Protection
The RP402x incorporates a LX peak current limit circuit as the overcurrent protection circuit which controls the
duty of LX when the LX peak current (ILXPEAK) reaches typically 1.5 A.
Latch Type Protection (RP402xxxxA/ C/ E/ G)
The RP402xxxxA/ C/ E/ G provides a latch type protection circuit to latch the power MOSFET to the off state
in order to stop the DC/DC operation. To release the latch type protection, switch the CE pin from high to low
once and switch it back to high while the power is turned on. Please note that the LX peak current (ILXPEAK) and
the protection delay time (tprot) are easily affected by the self-heating or heat radiation efficiency. The large
reduction in input voltage (VIN) or the unstable input voltage caused by short-circuit may affect the protection
operation or protection delay time.
16
RP402x
No. EA-317-181205
Short-circuit Protection
The RP402x provides a short-circuit protection which stops the switching operation when a short circuit is
detected. After a consecutive fixed period of the short-circuit state, the device performs a restart with soft-start
operation. RP402xxxxA/ C/ E/ G latches the power in a stop state when the input voltage becomes lower than
typically 1.6V and it is short-circuited.
Overvoltage Protection
The RP402x provides an overvoltage lockout (OVLO) circuit for monitoring the input pin voltage and an
overvoltage protection (OVP) circuit for monitoring the output pin voltage. These circuits stops the switching
operation when an overvoltage is detected. If the output voltage is dropped below the set output voltage when
OVLO is released, the output voltage will be boosted to the set output voltage.
17
RP402x
No. EA-317-181205
OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS
Operation of Step-up DC/DC Converter and Output Current
Basic Circuit
Pch Tr.
Coil(L)
OUT
I
V
IN
OUT
V
CL
Nch Tr.
GND
The inductor current (IL) flowing through the inductor (L)
Discontinuous Mode Continuous Mode
max
IL
IL
IL
IL
max
min
IL
ILmin
tf
Iconst
t
t
on
off
on
t
t
t
off
t
t =1/fosc
t =1/fosc
A PWM control type step-up DC/DC converter has two operation modes characterized by the continuity of
inductor current: discontinuous current mode and continuous current mode.
The voltage applied to the inductor L, when transistor is ON, is described as “VIN”. So, the current is described
as “VIN x t / L”.
Therefore, the electric power (PON) supplied from the input side, while transistor is ON, is described as follows:
PON
tonVIN2 t/Ldt ··························································································· Equation 1
0
18
RP402x
No. EA-317-181205
In step-up circuit, power source supplies the electric power (POFF) even while transistor is OFF. The input
current supplied by power source while transistor is OFF is described as “(VOUT − VIN) x t / L”. Therefore, the
electric power POFF is described as follows:
tf
P
OFF
VIN(VOUT VIN)t/L dt
0
······································································ Equation 2
The time of which the inductance L releases the saved energy is described as “tf”. Therefore, the average
electric power (PAV) in a cycle is described as follows:
tf
PAV
tonVIN2 t/L dt
VIN(VOUTVIN)t/L dt} ···················· Equation 3
1/(tontoff){0
0
In PWM control, when “tf = toff”, the inductor current becomes continuous, so the switching regulator operation
turns into continuous current mode. The current deviation between On time and Off time is equal under steady-
state condition of continuous current mode as follows:
VIN x ton/ L = (VOUT − VIN) x toff / L ··············································································· Equation 4
The electric power (PAV) is equal to the output voltage (VOUTIOUT). Therefore, IOUT is as follows:
I
OUT = fosc x VIN2 x ton2 / {2 x L (VOUT - VIN)} = VIN2 x ton / (2 x L x VOUT)································ Equation 5
When IOUT becomes more than VIN ton toff / (2 L (ton + toff)), the inductor current becomes continuous,
so the switching regulator operation turns into continuous current mode. The continuous inductor current is
described as ICONST, so IOUT is described as follows:
IOUT = fosc x VIN2 x ton2 / (2 x L (VOUT − VIN)) + VIN x Iconst / VOUT········································ Equation 6
The peak current (ILmax) flowing through the inductor is described as follows:
ILmax = Iconst + VIN x ton / L ····················································································· Equation 7
Put Equation 4 into Equation 6 to solve ILmax. ILmax is described as follows:
ILmax = VOUT / VIN x IOUT + VIN x ton / (2 x L) ·································································· Equation 8
However, ton = (1 − VIN / VOUT) / fosc. The peak current is more than IOUT
.
Please consider ILmax when setting conditions of input and output, as well as selecting the external
components. The peak current in the discontinuous current mode in Equation 7 can be calculated by Iconst
= 0.
Please note: The above calculation formulas are based on the ideal operation of the device in continuous
mode. The loss caused by the external components and the built-in Lx switch are not included. Please use the
peak current in Equation 8 as a reference when selecting an inductor.
19
RP402x
No. EA-317-181205
TIMING CHART
Soft-start Operation and Latch-type Protection Operation
Input
Voltage
CE
Voltage
Output
Current
1.60V (Typ.)
Output
Voltage
LX
Voltage
tprot
RP402xxx1x 3.3ms (Typ.)
RP402xxx2x 4.1ms (Typ.)
0.5ms (Typ.)
Latch Protect*2
VFM Mode*1
PWM Mode
LX-Peak
Current
Limit
Low-Boost
Mode
Soft Start Period
Standby
*1
*2
Only for RP402xxx1x (MODE = ”L”)
Only for RP402xxxxA/ C/ E/ G
< Start-up >
When CE is changed from ”L” to ”H”, DC/DC converter starts up the operation. The RP402x has Low-Boost
mode which can start up with low voltage such as 0.7 V. The DC/DC boosts up with Low-Boost mode until the
output voltage reaches to typically 1.6 V. When the output voltage becomes more than or equal to typically 1.6
V, the soft-start operation starts in order to control inrush current. The DC/DC boosts up the output voltage
until it reaches to the setting output voltage.
20
RP402x
No. EA-317-181205
Please note: During Low-Boost mode, the oscillator frequency is dropped, so the step-up ability is low
compared to the normal operation mode. Please pay attention to the step-up ratio and the load current. Soft-
start time depends on “set output voltage”, “input voltage”, “ambient temperature”, and “load current”.
VOUT = 3.3V
IN = 1.8V
RL = 5.5kΩ
Soft Start Period vs.Input Voltage
RP402xxxxx
Soft Start Period vs.Ta
RP402x33xx
V
RL = 5.5kΩ
( Ta = 25°C )
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
100.0
10.0
1.0
VSET=1.8V
VSET=3.3V
VSET=5.5V
0.1
0
1
2
3
4
5
-50
-25
0
25
50
75
100
Input Voltage VIN [V]
Ta [℃]
21
RP402x
No. EA-317-181205
APPLICATION INFORMATION
L
LX
VIN
C1
RP402Kxxxx
VOUT
VOUT
CE
C2
CE Control
MODE
MODE Control
GND
RP402Kxxxx Typical Application (Fixed Output Voltage Type)
L
LX
RP402K00xx
VOUT
VIN
C1
VOUT
C2
RSPD
R1
R2
CE
CE Control
MODE Control
MODE
CSPD
VFB
GND
RP402K00xx Typical Application (Adjustable Output Voltage Type)
L
LX
VIN
C1
RP402Nxx1x
VOUT
VOUT
CE
C2
CE Control
GND
RP402Nxx1x Typical Application (Fixed Output Voltage Typ)
22
RP402x
No. EA-317-181205
Recommended Components
Symbol
Descriptions
VLF403215MT-2R2M, 2.2 µH, TDK
VLS3012HBX-2R2M, TDK
NRS5020T2R2NMGJ, TAIYO YUDEN
L
C1 (CIN)
GRM188R60J106ME47, 10 µF, Murata
GRM188R60J106ME47, 10 µF x 2, Murata
C2 (COUT
)
As for the fixed output voltage type (RP402x50xx), 10 µF x 1 can be used if the
mounting area is limited.
The speedup capacitor (CSPD) is required for the adjustable output voltage type.
Connect CSPD in parallel with the output resistor (R1).
To calculate the CSPD value, the following equation can be used:
f = 1 / (2 π × CSPD × R1)
Adjust the CSPD value to make the oscillator frequency (f) approximately 20 kHz.
For example, VOUT = 5.0 V, R1 = 2 MΩ, R2 = 500 kΩ and CSPD = 4 pF.
CSPD
The R1 and R2 values are calculated based on the operation efficiency under a light
load, therefore R1 and R2 are having high-resistance values. The feedback voltage
(VFB) can be affected by noise. To stabilize the device operation, decrease the R1 and
R2 values.
The speedup resistor (RSPD) is required for the adjustable output voltage type.
Using RSPD can prevent the deterioration of the characteristics due to noise.
RSPD
If there’s a possibility of generation of a spike noise, use an approximately 1 kΩ RSPD
.
23
RP402x
No. EA-317-181205
TECHNICAL NOTES
The performance of a power source circuit using this device is highly dependent on a peripheral circuit. A
peripheral component or the device mounted on PCB should not exceed its rated voltage, rated current or
rated power. When designing a peripheral circuit, please be fully aware of the following points. (Refer to PCB
Layout Considerations below.)
Ensure the VIN and GND lines are firmly connected. A large switching current flows through the GND lines
and the VIN line. If their impedance is too high, noise pickup or unstable operation may result. When the
built-in switch is turned off, the inductor may generate a spike-shaped high voltage. Use the high-
breakdown voltage capacitor (COUT) which output voltage is 1.5 times or more than the set output voltage.
After a boosting of the step-up converter, the converter uses VOUT as a main power source. Therefore,
the ceramic capacitor between the VOUT pin and the GND pin acts as a bypass capacitor. Considering the
bias dependence, place a 10 µF or more ceramic capacitor (COUT) between the VOUT pin - the GND pin as
close as possible. Also, place an approximately 10 µF ceramic capacitor (CIN) between the VIN pin - the
GND pin.
Use a 2.2 µH inductor (L) which is having a low equivalent series resistance, having enough tolerable
current and which is less likely to cause magnetic saturation.
The MODE pin is controlled with a logic voltage. To make it "H", 1.0 V or more must be forced to the
MODE pin. If power supply is less than 1.0 V, MODE pin must be pulled up to VOUT
When using Forced PWM Control Type, the MODE pin should be “H”.
.
The RP402x can reset the latch protection circuit by setting the CE signal ‘L’ (VCE < 0.3 V) once while the
power is switched on (VIN > 0.8 V). If setting the CE pin when VIN does not reach 0.8 V due to too large
CIN, the latch protection circuit cannot be reset correctly. Likewise, if starting the device up when the CE
pin is shorted to the VIN pin or VOUT pin, the latch protection circuit cannot be reset.
If controlling the CE pin by input voltage, the gradient of the power supply at rising must be considered.
So, the CE pin must be connected via the delay circuit or the voltage detector to become the CE pin
voltage less than 0.3 V until the VIN becomes more than 0.8V.
24
RP402x
No. EA-317-181205
PCB Layout Considerations
Current Path on PCB
Figure 1 and Figure 2 show the current pathways of application circuits when MOSFET is turned ON or when
MOSFET is turned OFF, respectively. As shown in Figure 1 and Figure 2, the currents flow in the directions of
blue or green arrows. The parasitic components (impedance, inductance or capacitance) formed in the
pathways indicated by the red arrows affect the stability of the system and become the cause of noise. Reduce
the parasitic components as much as possible. The current pathways should be made by short and thick
wirings.
Figure 1. MOSFET-ON
Figure 2. MOSFET-OFF
25
RP402x
No. EA-317-181205
RP402Kxxxx (PKG: DFN(PLP)2020-8pin) Typical Board Layout
Top Layer
Bottom Layer
Bottom Layer
Bottom Layer
RP402K00xx (PKG: DFN(PLP)2020-8pin) Typical Board Layout
Top Layer
RP402Nxxxx (PKG: SOT-23-5pin) Typical Board Layout
Top Layer
26
RP402x
No. EA-317-181205
TYPICAL CHARACTERISTICS
Note: Typical Characteristics are intended to be used as reference data; they are not guaranteed.
1) Output Voltage vs. Output Current
RP402x181x
MODE = "L" ( VFM / PWM )
RP402K181x
MODE = "H" ( Normal PWM )
(Ta = 25°C)
Input Voltage
1.9
1.88
1.86
1.84
1.82
1.8
(Ta = 25°C)
Input Voltage
1.9
1.88
1.86
1.84
1.82
1.8
0.7V
0.8V
1.0V
1.2V
1.5V
0.7V
0.8V
1.0V
1.2V
1.5V
1.78
1.76
1.74
1.72
1.7
1.78
1.76
1.74
1.72
1.7
0.1
1
10
100
1000
10000
0.1
1
10
100
OUT(mA)
1000
10000
Output Current IOUT(mA)
Output Current
I
RP402K182x
( Forced PWM )
(Ta = 25°C)
1.9
Input Voltage
1.88
1.86
1.84
1.82
1.8
0.7V
0.8V
1.0V
1.2V
1.5V
1.78
1.76
1.74
1.72
1.7
0.1
1
10
100
OUT(mA)
1000
10000
Output Current
I
RP402x331x
MODE = "L" ( VFM / PWM )
RP402K331x
MODE = "H" ( Normal PWM )
(Ta = 25°C)
Input Voltage
(Ta = 25°C)
3.5
3.5
Input Voltage
3.45
3.4
3.45
0.7V
0.8V
1.2V
1.5V
1.8V
2.0V
2.5V
3.0V
0.7V
0.8V
1.2V
1.5V
1.8V
2.0V
2.5V
3.0V
3.4
3.35
3.3
3.35
3.3
3.25
3.2
3.25
3.2
3.15
3.1
3.15
3.1
0.1
1
10
Output Current
100
OUT(mA)
1000
10000
0.1
1
10
100
1000
10000
I
Output Current IOUT(mA)
RP402K332x
( Forced PWM )
(Ta = 25°C)
3.5
Input Voltage
3.45
3.4
0.7V
0.8V
1.2V
3.35
3.3
1.5V
1.8V
3.25
3.2
2.0V
2.5V
3.15
3.1
3.0V
0.1
1
10
Output Current
100
OUT(mA)
1000
10000
I
27
RP402x
No. EA-317-181205
RP402x501x
MODE = "L" ( VFM / PWM )
RP402K501x
MODE = "H" ( Normal PWM )
(Ta = 25°C)
Input Voltage
(Ta = 25°C)
Input Voltage
5.2
5.15
5.1
5.2
5.15
5.1
0.8V
1.2V
1.8V
2.4V
2.7V
3.2V
3.7V
4.2V
0.8V
1.2V
1.8V
2.4V
2.7V
3.2V
3.7V
4.2V
5.05
5
5.05
5
4.95
4.9
4.95
4.9
4.85
4.8
4.85
4.8
0.1
1
10
100
1000
10000
0.1
1
10
100
OUT(mA)
1000
10000
Output Current IOUT(mA)
Output Current
I
RP402K502x
( Forced PWM )
(Ta = 25°C)
5.2
5.15
5.1
Input Voltage
0.8V
1.2V
1.8V
5.05
5
2.4V
2.7V
4.95
4.9
3.2V
3.7V
4.85
4.8
4.2V
0.1
1
10
100
1000
10000
Output Current IOUT(mA)
RP402K551x
MODE = "H" ( Nomal PWM )
RP402x551x
MODE = "L" ( VFM / PWM )
(Ta = 25°C)
Input Voltage
(Ta = 25°C)
5.8
5.7
5.6
5.5
5.4
5.3
5.2
5.8
5.7
5.6
5.5
5.4
5.3
5.2
Input Voltage
0.8V
0.8V
1.2V
1.8V
2.4V
2.7V
3.2V
3.7V
4.2V
4.8V
1.2V
1.8V
2.4V
2.7V
3.2V
3.7V
4.2V
4.8V
0.1
1
10
100
1000
10000
0.1
1
10
100
1000
10000
Output Current IOUT(mA)
Output Current IOUT(mA)
RP402K552x
( Forced PWM
)
(Ta = 25°C)
5.8
5.7
5.6
5.5
5.4
5.3
5.2
Input Voltage
0.8V
1.2V
1.8V
2.4V
2.7V
3.2V
3.7V
4.2V
4.8V
0.1
1
10
100
1000
10000
Output Current IOUT(mA)
28
RP402x
No. EA-317-181205
2) Efficiency vs. Output Current
RP402K181x
MODE = "H" ( Normal PWM )
RP402x181x
MODE = "L" ( VFM / PWM )
(Ta = 25°C)
Input Voltage
(Ta = 25°C)
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
Input Voltage
0.7V
0.8V
1.0V
1.2V
1.5V
0.7V
0.8V
1.0V
1.2V
1.5V
0.01
0.1
1
10
IOUT(mA)
100
1000
0.01
0.1
1
10
IOUT(mA)
100
1000
Output Current
Output Current
RP402K182x
( Forced PWM )
(Ta = 25°C)
Input Voltage
100
90
80
70
60
50
40
30
20
10
0
0.7V
0.8V
1.0V
1.2V
0.01
0.1
1
10
100
1000
Output Current IOUT(mA)
RP402K331x
MODE = "H" ( Normal PWM )
RP402x331x
MODE = "L" ( VFM / PWM )
(Ta = 25°C)
(Ta = 25°C)
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
Input Voltage
Input Voltage
0.7V
0.7V
0.8V
1.2V
1.5V
1.8V
2.0V
2.5V
3.0V
0.8V
1.2V
1.5V
1.8V
2.0V
2.5V
3.0V
0.01
0.1
1
10
100
1000
0.01
0.1
1
10
IOUT(mA)
100
1000
Output Current IOUT(mA)
Output Current
RP402K332x
( Forced PWM )
(Ta = 25°C)
Input Voltage
100
90
80
70
60
50
40
30
20
10
0
0.7V
0.8V
1.2V
1.5V
1.8V
2.0V
2.5V
0.01
0.1
1
10
100
1000
Output Current IOUT(mA)
29
RP402x
No. EA-317-181205
RP402x501x
RP402K501x
MODE = "L" ( VFM / PWM )
MODE = "H" ( Normal PWM )
(Ta = 25°C)
Input Voltage
(Ta = 25°C)
Input Voltage
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
0.8V
1.2V
1.8V
2.4V
2.7V
3.2V
3.7V
4.2V
0.8V
1.2V
1.8V
2.4V
2.7V
3.2V
3.7V
4.2V
0.01
0.1
1
10
OUT(mA)
100
1000
0.01
0.1
1
10
OUT(mA)
100
1000
Output Current
I
Output Current
I
RP402K502x
( Forced PWM )
(Ta = 25°C)
100
90
80
70
60
50
40
30
20
10
0
Input Voltage
0.8V
1.2V
1.8V
2.4V
2.7V
3.2V
3.7V
4.2V
0.01
0.1
1
10
IOUT(mA)
100
1000
Output Current
RP402K551x
MODE = "H" ( Normal PWM )
RP402x551x
MODE = "L" ( VFM / PWM )
(Ta = 25°C)
(Ta = 25°C)
Input Voltage
100
90
80
70
60
50
40
30
20
10
0
100
Input Voltage
0.8V
90
80
70
60
50
40
30
20
10
0
0.8V
1.2V
1.8V
2.4V
2.7V
3.2V
3.7V
4.2V
4.8V
1.2V
1.8V
2.4V
2.7V
3.2V
3.7V
4.2V
4.8V
0.01
0.1
1
10
IOUT(mA)
100
1000
0.01
0.1
1
10
100
1000
Output Current
Output Current IOUT(mA)
RP402K552x
( Forced PWM )
(Ta = 25°C)
100
90
80
70
60
50
40
30
20
10
0
Input Voltage
0.8V
1.2V
1.8V
2.4V
2.7V
3.2V
3.7V
4.2V
0.01
0.1
1
10
IOUT(mA)
100
1000
Output Current
30
RP402x
No. EA-317-181205
3) Standby Current vs. Ambient Temperature
RP402x33xA/B/E/F
RP402x33xC/D/G/H
VIN = 4.8V / VOUT = OPEN
VIN = 4.8V / VOUT = GND
5.0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Ta [°C]
Ta [°C]
4) Supply Current 1 vs. Ambient Temperature
RP402x33xx
VIN = VSET - 0.4V / VOUT = 0.95 × VSET
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-50
-25
0
25
50
75
100
Ta [°C]
5) Supply Current 2 vs. Ambient Temperature
RP402x331x
VIN = VSET - 0.4V / VOUT = VSET + 0.2V
30
25
20
15
10
5
0
-50
-25
0
25
50
75
100
Ta [°C]
6) Start-up vs. Ambient Temperature
RP402x33xx
( RL = 5.5kΩ )
0.8
0.75
0.7
0.65
0.6
-50
-25
0
25
50
75
100
Ta [°C]
31
RP402x
No. EA-317-181205
7) Hold-on Voltage vs. Ambient Temperature
RP402x33xx
( RL = 5.5kΩ )
0.41
0.39
0.37
0.35
0.33
0.31
0.29
0.27
0.25
-50
-25
0
25
50
75
100
Ta [°C]
8) Oscillator Frequency vs. Ambient Temperature
RP402K331x
MODE = "H" ( Normal PWM )
RP402K332x
( Forced PWM
VIN = 1.5V
)
VIN = 1.5V
1400
1350
1300
1250
1200
1150
1100
1050
1000
1200
1150
1100
1050
1000
950
900
850
800
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Ta [°C]
Ta [°C]
9) Maxduty vs. Ambient Temperature
RP402x33xx
100
90
80
70
60
50
40
30
20
10
0
-50
-25
0
25
50
75
100
Ta [°C]
10) Lx Current Limit vs. Duty
RP402xxxxx
(Ta = 25°C)
2500
2300
2100
1900
1700
1500
1300
1100
900
RP402K001x (5.0V)
RP402K001x (3.3V)
RP402K001x (2.9V)
RP402K001x (2.5V)
RP402K001x (2.3V)
RP402K001x (2.0V)
RP402K001x (1.8V)
700
500
20
30
40
50
60
70
80
90
Duty [%]
32
RP402x
No. EA-317-181205
11) Lx Current Limit vs. Ambient Temperature
RP402x33xx
VIN = 1.65V
2500
2300
2100
1900
1700
1500
1300
1100
900
700
500
-50
-25
0
25
50
75
100
Ta [°C]
12) CE ”H” Input Voltage vs. Ambient Temperature
RP402xxxxx
0.8
0.7
0.6
0.5
0.4
0.3
0.2
-50
-25
0
25
50
75
100
Ta [°C]
13) MODE ”H” Input Voltage vs. Ambient Temperature
RP402Kxxxx
1.0
0.8
0.6
0.4
0.2
0.0
-50
-25
0
25
50
75
100
Ta [°C]
14) Output Voltage vs. Ambient Temperature
RP402x33xx
VIN = 1.5V
3.40
3.38
3.36
3.34
3.32
3.30
3.28
3.26
3.24
3.22
3.20
-50
-25
0
25
50
75
100
Ta [°C]
33
RP402x
No. EA-317-181205
15) Feedback Voltage vs. Ambient Temperature
RP402K00xx (VSET = 5.0V)
VIN = 3.0V
1.03
1.02
1.01
1.00
0.99
0.98
0.97
-50
-25
0
25
50
75
100
Ta [°C]
16) Start-up Waveform (COUT = 20 μF)
RP402K331A
RP402K331A
(Ta = 25°C)
VIN = 1.2V / IOUT = 1mA)
(Ta = 25°C)
Output Voltage
VIN = 1.8V / IOUT = 1mA)
4
3
2
1
0
Output Voltage
4
3
2
1
0
CE Input Voltage
CE Input Voltage
1.5
1
1.5
1
Inductor Current
Inductor Current
0.5
0
0.5
0
-0.5
-0.5
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
-0.5
0
0.5
1
1.5
2
Time t [ms]
Time t [ms]
17) Load Transient Response (COUT = 20 μF)
RP402x181x
MODE = "L" (VFM / PWM)
RP402x181x
MODE = "L" (VFM / PWM)
(Ta = 25°C)
V
IN = 0.9V
(Ta = 25°C)
VIN = 0.9V
1.9
1.85
1.8
1.9
1.85
1.8
Output Voltage
Output Voltage
1.75
1.7
1.75
1.7
Output Current
1mA <-> 50mA
Output Current
50mA <-> 1mA
50
0
50
0
-40 -20
0
20 40 60 80 100 120 140 160
Time t [μs]
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Time t [ms]
RP402K181x
MODE = "H" (Normal PWM)
RP402K181x
MODE = "H" (Normal PWM)
(Ta = 25°C)
VIN = 0.9V
(Ta = 25°C)
VIN = 0.9V
1.9
1.85
1.8
1.9
1.85
1.8
Output Voltage
Output Voltage
1.75
1.7
1.75
1.7
Output Current
1mA <-> 50mA
Output Current
50mA <-> 1mA
50
0
50
0
-40 -20
0
20 40 60 80 100 120 140 160
Time t [μs]
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Time t [ms]
34
RP402x
No. EA-317-181205
RP402K182x
RP402K182x
(Forced PWM)
(Forced PWM)
(Ta = 25°C)
(Ta = 25°C)
VIN = 0.9V
VIN = 0.9V
1.9
1.85
1.8
1.9
1.85
1.8
Output Voltage
Output Voltage
1.75
1.7
1.75
1.7
Output Current
1mA <-> 50mA
Output Current
50mA <-> 1mA
50
0
50
0
-40 -20
0
20 40 60 80 100 120 140 160
Time t [μs]
-40 -20
0
20 40 60 80 100 120 140 160
Time t [ms]
RP402x331x
RP402x331x
MODE = "L" (VFM / PWM)
MODE = "L" (VFM / PWM)
(Ta = 25°C)
VIN = 1.8V
(Ta = 25°C)
VIN = 1.8V
3.6
3.5
3.4
3.3
3.2
3.1
3.6
3.5
3.4
3.3
3.2
3.1
Output Voltage
Output Voltage
Output Current
1mA <-> 200mA
Output Current
200mA <-> 1mA
200
0
200
0
-40 -20
0
20 40 60 80 100 120 140 160
Time t [μs]
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Time t [ms]
RP402K331x
MODE = "H" (Normal PWM)
RP402K331x
MODE = "H" (Normal PWM)
(Ta = 25°C)
VIN = 1.8V
(Ta = 25°C)
VIN = 1.8V
3.6
3.5
3.4
3.3
3.2
3.1
3.6
3.5
3.4
3.3
3.2
3.1
Output Voltage
Output Voltage
Output Current
1mA <-> 200mA
Output Current
200mA <-> 1mA
200
0
200
0
-40 -20
0
20 40 60 80 100 120 140 160
Time t [μs]
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Time t [ms]
RP402K332x
RP402K332x
(Forced PWM)
(Forced PWM)
(Ta = 25°C)
(Ta = 25°C)
VIN = 1.8V
VIN = 1.8V
3.6
3.5
3.4
3.3
3.2
3.1
3.6
3.5
3.4
3.3
3.2
3.1
Output Voltage
Output Voltage
Output Current
1mA <-> 200mA
Output Current
200mA <-> 1mA
200
0
200
0
-40 -20
0
20 40 60 80 100 120 140 160
Time t [μs]
-40 -20
0
20 40 60 80 100 120 140 160
Time t [ms]
35
RP402x
No. EA-317-181205
RP402K501x
MODE = "L" (VFM / PWM)
RP402K501x
MODE = "L" (VFM / PWM)
(Ta = 25°C)
VIN = 3.7V
(Ta = 25°C)
VIN = 3.7V
5.1
5.2
5.15
5.1
Output Voltage
5.05
5
Output Voltage
5.05
5
4.95
4.9
4.95
4.9
4.85
Output Current
1mA <-> 250mA
Output Current
250mA <-> 1mA
4.85
250
0
250
0
-40 -20
0
20 40 60 80 100 120 140 160
Time t [μs]
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Time t [ms]
RP402K501x
MODE = "H" (Normal PWM)
RP402K501x
MODE = "H" (Normal PWM)
(Ta = 25°C)
VIN = 3.7V
(Ta = 25°C)
V
IN = 3.7V
5.2
5.15
5.1
5.1
5.05
5
Output Voltage
Output Voltage
5.05
5
4.95
4.9
4.95
4.9
4.85
Output Current
1mA <-> 250mA
Output Current
250mA <-> 1mA
4.85
250
0
250
0
-40 -20
0
20 40 60 80 100 120 140 160
Time t [μs]
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Time t [ms]
RP402K502x
(Forced PWM)
RP402K502x
(Forced PWM)
(Ta = 25°C)
VIN = 3.7V
(Ta = 25°C)
VIN = 3.7V
5.2
5.15
5.1
5.1
5.05
5
Output Voltage
Output Voltage
5.05
5
4.95
4.9
4.95
4.9
4.85
Output Current
250mA <-> 1mA
Output Current
1mA <-> 250mA
4.85
250
0
250
0
-40 -20
0
20 40 60 80 100 120 140 160
-40 -20
0
20 40 60 80 100 120 140 160
Time t [μs]
Time t [μs]
18) Output Voltage Waveform (COUT = 20 μF)
RP402x331x
MODE = "L" (VFM / PWM )
RP402x331x
MODE = "L" (VFM / PWM )
(Ta = 25°C)
(Ta = 25°C)
3.34
3.32
3.3
3.4
VIN = 1.5V / IOUT = 100mA
VIN = 1.5V / IOUT = 1mA
Output Voltage
Output Voltage
3.35
3.3
LX Voltage
LX Voltage
3.28
4
3.25
4
2
2
0
0
-2
-2
0
1
2
3
4
5
0
1
2
3
4
5
Time t [μs]
Time t [ms]
36
RP402x
No. EA-317-181205
RP402K331x
MODE = "H" (Normal PWM )
RP402K331x
MODE = "H" (Normal PWM )
(Ta = 25°C)
(Ta = 25°C)
3.34
3.32
3.3
3.4
3.35
3.3
VIN = 1.5V / IOUT = 100mA
Output Voltage
VIN = 1.5V / IOUT = 1mA
Output Voltage
LX Voltage
3.28
4
LX Voltage
3.25
4
2
2
0
0
-2
-2
0
1
2
3
4
5
0
1
2
3
4
5
Time t [μs]
Time t [μs]
RP402K332x
(Forced PWM )
RP402K332x
(Forced PWM )
(Ta = 25°C)
(Ta = 25°C)
3.4
3.34
VIN = 1.5V / IOUT = 1mA
VIN = 1.5V / IOUT = 100mA
Output Voltage
Output Voltage
3.35
3.32
3.3
3.3
LX Voltage
LX Voltage
3.25
4
3.28
4
2
2
0
0
-2
-2
0
1
2
3
4
5
0
1
2
3
4
5
Time t [μs]
Time t [μs]
19) Mode Switching Waveform
RP402K331x
( Ta = 25°C )
4
VIN = 1.5V / IOUT = 1mA
2
0
MODE Input Voltage
3.4
3.35
3.3
Output Voltage
3.25
3.2
-2
-1
0
1
2
3
4
5
6
7
8
Time t [ms]
20) Bypass Switch ON Resistance
RP402xxxxC/D/G/H
300.0
(Ta= 25°C)
Vin=2
V
250.0
200.0
150.0
100.0
50.0
Vin=3.
2V
0.0
0
2
4
6
VOUT [V]
37
RP402x
No. EA-317-181205
21) PWM Operable Maximum Input Voltage vs. Ambient Temperature
RP402Kxx2x: (Forced PWM)
RP402Kxx1x: MODE = "H" (Normal PWM)
RP402K50xx
( IOUT = 1mA)
RP402K50xx
( IOUT = 10mA)
5
4.5
4
5
4.5
4
3.5
3
3.5
3
2.5
2
2.5
2
1.5
1
1.5
1
RP402K502x
RP402K501x
RP402K502x
RP402K501x
0.5
0
0.5
0
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Ta [°C]
Ta [°C]
RP402K50xx
( IOUT = 100mA)
5
4.5
4
3.5
3
2.5
2
1.5
1
RP402K502x
RP402K501x
0.5
0
-50
-25
0
25
50
75
100
Ta [°C]
22) Reverse Current at VIN = 0 vs. Ambient Temperature
RP402xxxxx
VIN = 0V / VOUT = 5.5V
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-50
-25
0
25
50
75
100
Ta [°C]
23) Latch Protection Delay Time vs. Ambient Temperature
RP402xxx2A/C/E/G
RP402xxx1A/C/E/G
VIN = 4.5V
VIN = 4.5V
4.0
4.8
4.6
4.4
4.2
4.0
3.8
3.6
3.8
3.6
3.4
3.2
3.0
2.8
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Ta [°C]
Ta [°C]
38
POWER DISSIPATION
DFN(PLP)2020-8
Ver. A
The power dissipation of the package is dependent on PCB material, layout, and environmental conditions.
The following measurement conditions are based on JEDEC STD. 51-7.
Measurement Conditions
Item
Measurement Conditions
Mounting on Board (Wind Velocity = 0 m/s)
Environment
Board Material
Board Dimensions
Glass Cloth Epoxy Plastic (Four-Layer Board)
76.2 mm × 114.3 mm × 0.8 mm
Outer Layer (First Layer): Less than 95% of 50 mm Square
Inner Layers (Second and Third Layers): Approx. 100% of 50 mm Square
Outer Layer (Fourth Layer): Approx. 100% of 50 mm Square
Copper Ratio
Through-holes
0.3 mm × 23 pcs
Measurement Result
(Ta = 25°C, Tjmax = 125°C)
Item
Measurement Result
Power Dissipation
1800 mW
Thermal Resistance (ja)
ja = 53°C/W
Thermal Characterization Parameter (ψjt)
ψjt = 27°C/W
ja: Junction-to-Ambient Thermal Resistance
ψjt: Junction-to-Top Thermal Characterization Parameter
2000
1800
1800
1600
1400
1200
1000
800
600
400
200
0
85
0
25
50
75
100
125
Ambient Temperature (°C)
Power Dissipation vs. Ambient Temperature
Measurement Board Pattern
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PACKAGE DIMENSIONS
DFN (PLP) 2020-8
Ver. B
*
*
DFN (PLP) 2020-8 Package Dimensions
∗ The tab on the bottom of the package shown by blue circle is a substrate potential (GND). It is recommended that this
tab be connected to the ground plane on the board but it is possible to leave the tab floating.
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POWER DISSIPATION
SOT-23-5
Ver. A
The power dissipation of the package is dependent on PCB material, layout, and environmental conditions.
The following measurement conditions are based on JEDEC STD. 51-7.
Measurement Conditions
Item
Measurement Conditions
Mounting on Board (Wind Velocity = 0 m/s)
Environment
Board Material
Board Dimensions
Glass Cloth Epoxy Plastic (Four-Layer Board)
76.2 mm × 114.3 mm × 0.8 mm
Outer Layer (First Layer): Less than 95% of 50 mm Square
Inner Layers (Second and Third Layers): Approx. 100% of 50 mm Square
Outer Layer (Fourth Layer): Approx. 100% of 50 mm Square
0.3 mm × 7 pcs
Copper Ratio
Through-holes
Measurement Result
(Ta = 25°C, Tjmax = 125°C)
Item
Measurement Result
Power Dissipation
660 mW
Thermal Resistance (ja)
ja = 150°C/W
Thermal Characterization Parameter (ψjt)
ψjt = 51°C/W
ja: Junction-to-Ambient Thermal Resistance
ψjt: Junction-to-Top Thermal Characterization Parameter
Power Dissipation vs. Ambient Temperature
Measurement Board Pattern
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PACKAGE DIMENSIONS
SOT-23-5
Ver. A
2.9±0.2
1.9±0.2
1.1±0.1
0.8±0.1
(0.95)
(0.95)
5
4
3
0～0.1
1
2
+0.1
0.15-0.05
0.4±0.1
SOT-23-5 Package Dimensions
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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. The X-ray exposure can influence functions and characteristics of the products. Confirm the product functions and
characteristics in the evaluation stage.
9. WLCSP products should be used in light shielded environments. The light exposure can influence functions and
characteristics of the products under operation or storage.
10. There can be variation in the marking when different AOI (Automated Optical Inspection) equipment is used. In the
case of recognizing the marking characteristic with AOI, please contact Ricoh sales or our distributor before attempting
to use AOI.
11. 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.
https://www.e-devices.ricoh.co.jp/en/
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