RP401x Series
PWM/VFM Step-up DC/DC Converter
The RP401x Series are CMOS-based PWM/VFM step-up DC/DC converters which can start-up from Typ. 0.6V. RP401K can be switched from
two control types by inputting signal to the MODE pin - fixed PWM control or PWM/VFM auto switching control in which mode automatically
switches to high-efficiency VFM mode in low output current. (RP401N Series can be selected from fixed PWM control or PWM/VFM auto
switching control.) RP401x includes a soft start circuit. By simply using an inductor, a capacitor, a diode, and (resistors) as external
components, a high-efficiency step-up DC/DC converter can be easily configured. The output voltage can be selected from the internally
fixed or the externally adjustment. In addition to SOT-23-5 package, a 1.8mm
×
2.0mm square DFN(PLP)1820-6 package is also available.
FEATURES
•
Supply Current (I
DD1
) ····················· Typ. 400μA (V
SET
=3.0V, Switching)
•
Supply Current (I
DD2
)······················· Typ. 130μA (No switching, VFM)
•
Supply Current (I
DD2
)······················· Typ. 230μA (No switching, PWM)
•
Standby Current (I
standby
)·················· Max. 3μA (CE="L")
•
Input Voltage Range (V
IN
) ··············· 0.6V to 5.5V
•
Hold-on Voltage (V
H
OLD
)·················· Min. 0.6V
•
Output Voltage Range (V
OUT
)·········· 1.8V to 5.5V (Internally fixed) (xx1)
•
Output Voltage Accuracy ················± 2%
•
Oscillator Frequency (f
osc
)··············· 1.2MHz
Externally adjustable (Feedback voltage : 0.6V) (001C/D)
•
Oscillator Maximum Duty Cycle (Maxduty) ···Min. 80%, Typ. 88%
•
Coil-current Limit Circuit ················Current Limit Typ.1A
∗
•
Soft Start Time (t
start
)························Typ. 0.7ms
•
Latch Protection Circuit···················Delay time for protection
•
•
Typ. 3.3ms (A Version only)
MODE pin ·······································"H" : fixed PWM control,
"L" : PWM/VFM auto switching
control (A/B Version)
Packages ········································DFN(PLP)1820-6, SOT-23-5
∗)
This is an approximate value, because ON duty depends on conditions
BLOCK DIAGRAMS
RP401Kxx1A/B
(Internally fixed output voltage type)
V
IN
VFM Control
OSC
Startup
Circuit
Current
Protection
RP401N001C/D
(Ext. adjustable output voltage type)
V
IN
V
IN
VFM Control
∗
OSC
Startup
Circuit
Current
Protection
RP401Nxx1C/D
(Internally fixed output voltage type)
VFM Control
∗
OSC
Startup
Circuit
Current
Protection
L
X
L
X
L
X
Vref
Error Amp.
Soft
Start
Ramp
Compensation
PWM
Switching
Control
Current
Feedback
Vref
Error Amp.
Soft
Start
Ramp
Compensation
PWM
Switching
Control
Current
Feedback
Vref
Error Amp.
Soft
Start
Ramp
Compensation
PWM
Switching
Control
Current
Feedback
CE
Chip
Enable
CE
V
OUT
Chip
Enable
CE
V
OUT
V
FB
Chip
Enable
V
OUT
MODE
Mode Control
GND
GND
GND
∗
) only RP401N001C (PWM/VFM auto switching control)
∗
) only RP401Nxx1C (PWM/VFM auto switching control)
SELECTION GUIDES
Halogen Free
Part No.
RP401K.xx.1.
∗
-TR
DFN(PLP)1820-6 5,000 pcs
RP401K.00.1.$.-TR
SOT-23-5
3,000 pcs RP401N.xx.1.$.-TR-FE
Package
Q'ty per Reel
TYPICAL APPLICATIONS
RP401Kxx1A/B
(Internally fixed output Voltage type)
L4.7μH
SD
V
IN
C
IN
10μF
CE
Control
MODE
Control
L
X
V
OUT
1.8V to 5.0V
RP401K001C/D
(Externally adjustable output voltage type)
L4.7μH
SD
V
IN
C
IN
10μF
CE
Control
L
X
RP401K001x
V
OUT
C
OUT
CE
V
FB
GND
R1
10μF×2
.xx.
: Specify the output voltage within the range of
1.8V (.18.) to 5.5V (.55.) in 0.1V steps.
.00.
: Specify the output voltage external adjustable within
the recommendation range of 1.8V to 5.5V.
.∗
: Select from (.A.) with MODE pin, with Latch protection circuit,
(.B.) with MODE pin, without Latch protection circuit.
.$.
: Select from (.C.) PWM/VFM auto switching, without Latch
protection circuit, (.D.) fixed PWM, without Latch protection circuit.
RP401K
xx1A/B
CE
V
OUT
MODE
GND
C
OUT
10μF×2
V
OUT
1.8V to 5.0V
R2
C
IN
: C1608JB0J106M, (10μF, TDK)
C
OUT
: C1608JB0J106M x 2, (10μF x 2, TDK)
PACKAGES
DFN(PLP)1820-6
Top View
6
5
4
TYPICAL CHARACTERISTICS
SOT-23-5
5
4
RP401x331x / RP401K001x (V
OUT
=3.3V)
PWM/VFM auto switching control
100
90
80
70
60
50
40
30
20
10
0
1
Efficiency vs. Output Current
Fixed PWM control
Bottom View
4
5
6
∗
1
1
2
3
3
2
1
2
3
1
2
3
4
5
6
xx1A/B
V
IN
CE
GND
L
X
MODE
V
OUT
001C/D
V
IN
CE
GND
L
X
V
FB
V
OUT
1
2
3
4
5
xx1C/D
CE
GND
V
IN
V
OUT
L
X
V
IN
=3.0V
V
IN
=2.5V
V
IN
=2.0V
V
IN
=1.5V
V
IN
=1.2V
V
IN
=0.8V
V
IN
=0.7V
100
90
80
70
60
50
40
30
20
10
0
1
Efficiency
η
(%)
Efficiency
η
(%)
V
IN
=3.0V
V
IN
=2.5V
V
IN
=2.0V
V
IN
=1.5V
V
IN
=1.2V
V
IN
=0.8V
V
IN
=0.7V
∗
)
The tab is substrate level (GND).
10
100
Output Current I
OUT
(mA)
1000
10
100
Output Current I
OUT
(mA)
1000
APPLICATIONS
•
MP3 players and PDA
•
Digital cameras
No.EK-260-121001
•
LCD bias power supply
•
Personal medical equipment
•
Wireless Handset
•
GPS
Step-up DC/DC Converter
RP401x Series
PWM/VFM Step-up DC/DC Converter
Step-up DC/DC Converter
RP401x Series / RP400x Series
Step-up DC/DC Converter Comparison
RP401x Series
A/B Version
Control
C Version
D Version
PWM/VFM auto switching
Fixed PWM
RP400x Series
Fixed PWM⇔
PWM/VFM
PWM/VFM auto switching
auto switching
(It can be switched by MODE pin)
1A
0.6V to 5.5V
1.8V to 5.5V
or
Externally adjustable (only DFN)
±2%
(±12mV)
1.2MHz
80%
0.7ms
3.3ms (only A Version)
DFN(PLP)1820-6
Lx Current limit *
Input Voltage Range
Output Voltage Range
Output Voltage Accuracy
Oscillator Frequency (Typ.)
Oscillator Maximum
Duty Cycle (Min.)
Soft-start Time (Typ.)
Latch Protection Circuit
(Protection Delay Time)(Typ.)
Package
Others
*) Will change according to the duty cycle.
600mA
Max. 5.5V
1.8V to 5.0V
or
Externally adjustable (only DFN)
±2%
(±12mV)
700kHz
80%
0.7ms
－
DFN(PLP)1820-6 (Ext. adjustable type)
DFN(PLP)1820-6
SOT-23-5 (Fixed output Voltage type) SOT-23-5 (Fixed output Voltage type only)
Built- in Anti-Ringing Switch
The currently available information as of October 2012 is provided in this New Product News.
EK-260-121001
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