RP401x SERIES
HIGH EFFICIENCY, SMALL PACKAGES, STEP-UP DC/DC CONVERTERS
NO.EA-260-160812
OUTLINE
RP401x Series are high efficiency, step-up DC/DC converter ICs packaged in compact 5pin SOT23-5 or 6pin
DFN(PLP)1820-6. This IC can start up from low voltage (Typ.0.6V), therefore, it is suitable for using with single or
2 serial alkaline batteries, or a nickel-metal-hydride (NiMH) battery, or one-cell Lithium-ion (Li+) battery.
This IC consists of an oscillator, a reference voltage unit with soft start, a chip enable circuit, an error amplifier,
phase compensation circuits, a slope circuit, a PWM control circuit, a start-up circuit, a PWM/VFM mode control
circuit, internal switches and a protection circuit.
A low ripple high efficiency step-up DC/DC converter can be composed of the RP401x with only an inductor, a
diode, (resisters for adjustable type), and capacitors. The output voltage of the RP401K001s is adjustable, and
others are fixed internally. The output voltage range is from 1.8V to 5.5V. RP401Kxx1A/B series have a MODE pin
to alternate between PWM fix and PWM/VFM automatic shift to improve the efficiency at light load. If MODE pin is
set "H", the mode is PWM fix, and when the MODE pin is set "L", PWM/VFM automatic shift. The RP401xxx1C
and D do not have MODE pin. The RP401xxx1C is PWM/PFM alternative type, and the RP401xxx1D is PWM
fixed type.
FEATURES
●
Low Start-up Voltage guaranteed ························Typ. 0.6V
●
Input Voltage Range ········································0.6V ~ 5.5V
●
High Efficiency ···············································86% (100mA / 3.3V, V
IN
= 1.5V, 25°C)
●
Output current ················································500mA / 1.8V (V
IN
= 1.5V) / 5.0V (V
IN
= 3.3V)
●
Built-in Lx switch ·············································NMOS: 0.4Ω (V
OUT
= 3.3V, 25°C)
●
PWM Oscillator Frequency ································1.2MHz
●
Output Voltage Range ······································Fixed type: 1.8V to 5.5V with 0.1V Stepwise
Adjustable: 1.8V ~ 5.5V
(Recommendation range of output voltage)
●
Lx peak current limit function ·····························Typ. 1.0A
●
Latch protection delay time································3.3ms (Only applied to A version)
●
Small Packages ··············································DFN(PLP)1820-6, SOT23-5
APPLICATIONS
●
MP3 players, PDA, cellular phones
●
Digital Still Cameras
●
LCD Bias Supplies
●
Portable blood pressure meter
●
Wireless Handset
●
GPS
1
RP401x
BLOCK DIAGRAMS
Fixed output; RP401Kxx1A/B
V
IN
VFM
CONTROL
OSCILLATOR
STARTUP
CIRCUIT
CURRENT
PROTECTION
L
X
VREF
E/A
SOFT
START
RAMP
COMPENSATION
PWM
SWITCHING
CONTROL
CURRENT
FEEDBACK
CE
CHIP
ENABLE
V
OUT
MODE
MODE CONTROL
GND
Adjustable output type: RP401K001C/D
V
IN
VFM
CONTROL
*
OSCILLATOR
STARTUP
CIRCUIT
CURRENT
PROTECTION
L
X
VREF
E/A
SOFT
START
RAMP
COMPENSATION
PWM
SWITCHING
CONTROL
CURRENT
FEEDBACK
CE
CHIP
ENABLE
V
OUT
V
FB
GND
*) Applied to PWM/VFM automatic shift, RP401K001C only.
2
RP401x
Fixed output type: RP401Nxx1C/D
V
IN
VFM
CONTROL
*
OSCILLATOR
STARTUP
CIRCUIT
CURRENT
PROTECTION
L
X
VREF
E/A
SOFT
START
CHIP
ENABLE
RAMP
COMPENSATION
PWM
SWITCHING
CONTROL
CURRENT
FEEDBACK
CE
V
OUT
GND
*) Applied to PWM/VFM automatic shift, RP401Nxx1C only.
SELECTION GUIDE
In the RP400 Series, output Voltage, Type of Output Voltage, and package for the ICs can be selected at the
user’s request.
Product Name
RP401Kxx1$-TR
RP401Nxx1$-TR-FE
Package
DFN (PLP)1820-6
SOT-23-5
Quantity per Reel
5,000 pcs
3,000 pcs
Pb Free
Yes
Yes
Halogen Free
Yes
Yes
xx: Designation of output voltage
00: Adjustable Version (1.8V ~ 5.5V)
*
recommendation range of output voltage / DFN(PLP)1820-6 only
xx: Fixed version: designation is possible in the range from 1.8V to 5.5V with a step of 0.1V
$: Designation of option.
A: with Mode pin, latch type over-current protection circuit
B: with Mode pin, without latch type over-current protection circuit
C: without Mode pin (PWM/VFM automatic shift)
D: without Mode pin (PWM-fix)
3
RP401x
Product code table
Version
A
B
C
D
MODE pin
Yes
Yes
No
(PWM/VFM automatic shift)
No
(PWM fix)
Output Voltage
Fixed
Fixed
Fixed
Adjustable
Fixed
Adjustable
Latch type
over-current
protection
Yes
No
No
No
No
No
package
DFN(PLP)1820-6
DFN(PLP)1820-6
SOT-23-5
DFN(PLP)1820-6
SOT-23-5
DFN(PLP)1820-6
PIN CONFIGURATION
DFN(PLP)1820-6
SOT-23-5
5
6
5
4
(Bottom View)
4
1
2
3
1
2
3
(Top View)
PIN DESCRIPTION
RP401Kxx1A/B: DFN(PLP)1820-6
Pin No
1
2
3
4
5
6
Symbol
V
IN
CE
GND
Lx
MODE
V
OUT
Power Supply Pin
Chip Enable Pin (Active with ”H”)
Ground Pin
Internal NMOS Switch Drain Pin
Mode pin for switch over PWM-fix or PWM/VFM alternative
Output Pin
Pin Description
* Tab is GND level. (They are connected to the reverse side of this IC.) Connected to the GND is the recommendation,
leaving it open is also possible.
RP401K001C/D: DFN(PLP)1820-6
Pin No
1
2
3
4
5
6
Symbol
V
IN
CE
GND
Lx
V
FB
V
OUT
Power Supply Pin
Chip Enable Pin (Active with ”H”)
Ground Pin
Internal NMOS Switch Drain Pin
Feedback input voltage for setting output voltage
Output Pin
Pin Description
4
RP401x
* Tab is GND level. (They are connected to the reverse side of this IC.) Connected to the GND is the recommendation,
leaving it open is also possible.
RP401Nxx1C/D: SOT-23-5
Pin No
1
2
3
4
5
Symbol
CE
GND
V
IN
V
OUT
Lx
Ground Pin
Power Supply Pin
Output Pin
Internal NMOS Switch Drain Pin
Pin Description
Chip Enable Pin (Active ”H”)
ABSOLUTE MAXIMAM RATINGS
(GND=0V)
Symbol
V
IN
V
OUT
V
LX
V
CE
V
FB
V
MODE
P
D
Ta
Tstg
Items
V
IN
Supply Voltage
V
OUT
Pin Voltage
Lx Pin Input Voltage
CE Pin Voltage
V
FB
Pin Voltage
MODE Pin Voltage
Power Dissipation *
Ambient Temp Range
Storage Temp Range
RP401K001C/D
RP401K001A/B
SOT-23-5
DFN(PLP)1820-6
Ratings
-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0
420
880
-40 to +85
-55 to +125
Unit
V
V
V
V
V
V
mW
°C
°C
* As for Power Dissipation, refer to PACKAGE INFORMATION.
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent damages
and may degrade the lifetime and safety for both device and system using the device in the field. The functional operation
at or over these absolute maximum ratings is not assured.
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the recommended operating
conditions, even if when they are used over such conditions by momentary electronic noise or surge. And the
semiconductor devices may receive serious damage when they continue to operate over the recommended operating
conditions.
5
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