RP400Xxx1C SERIES
High Efficiency and Tiny Step-Up DC/DC Converters
NO.EA-193-090123
OUTLINE
RP400Xxx1C, RP400K001C are high efficiency, step-up DC-DC converter ICs packaged in compact 5pin
SOT23 or 6pin DFN (PLP) 1820. This converter starts up from low voltage (Typ.1.2V). Two alkaline or a
single Li+ battery source is also suitable.
This IC consists of a reference voltage unit with soft start, error amplifier, PWM comparator, current limit
circuit and internal switch and PWM/VFM mode control circuit. A low ripple high efficiency step up DC/DC
converter can be composed of RP400xseries with only an inductor, a diode, divider resistors and a
capacitor. This converter is based on a fixed frequency current mode PWM control which goes to power
save mode (VFM mode) at light load automatically. RP400Xxx1C, RP400K001C has built-in Anti-ringing
Switch to prevent switching node from ringing, when the converter enters the discontinuous current mode.
Output voltage of RP400K001C can be set within 1.8~5.0V (recommended range of output voltage) by
external divider resistors.
FEATURES
●
Low Start-up Voltage guaranteed ······················· 1.2V
●
Input Voltage Range ··········································· 1.2V~5.5V
●
High Efficiency ···················································· 85% (100mA/3.3V，V
IN
=1.5V，25°C)
●
Output current····················································· 200mA/3.3V(V
IN
=1.5V) Typ. 100mA/2.0V(V
IN
=1.2V)
●
Internal Switch ···················································· NMOS=0.4Ω (V
OUT
=3.3V, 25°C)
●
Built-in Frequency Compensation, Soft Start, Protection Circuit
●
PWM Low Ripple Oscillator Frequency ·············· 700kHz
●
Output Voltage Range ········································ Fixed: 1.8V to 5.0V with 0.1V Stepwise
Adjustable: 1.8V~5.0V (RP400K001 only)
(recommended range of output voltage)
●
Stable with Ceramic Capacitors
●
Small Package···················································· DFN(PLP)1820-6, SOT23-5
●
Internal EMI suppression (Anti-ringing switch is included)
APPLICATIONS
●
MP3 players, PDA
●
Digital Still Cameras
●
LCD Bias Supplies
●
Personal Medical Equipments
●
Wireless Handset
●
GPS
1
RP400x
BLOCK DIAGRAMS
1. Fixed Output with CE function RP400Xxx1C
Lx
V
IN
S ta rtu p
C irc u it
C o n tro l
L o g ic
B u ffe r
PW M
C o n tro l
C u rre n t
Sense
E rro rA m p
CE
C h ip
E n a b le
fo s c
PFM
-
+
V re f
V
OUT
S le e p
P ow er S ave M ode
O p e ra tio n C o n tro l
GND
2. Adjustable Output with CE function RP400K001C
Lx
V
IN
S ta rtu p
C irc u it
C o n tro l
L o g ic
B u ffe r
PW M
C o n tro l
C u rre n t
S ense
E rro rA m p
V
OUT
CE
C h ip
E n a b le
fo s c
PFM
-
+
V re f
V
FB
S le e p
P ow er S ave M ode
O p e ra tio n C o n tro l
GND
2
RP400x
SELECTION GUIDE
In the RP400, Output Voltage, Type of Output Voltage, the Package, can be selected at the user’s request.
The selection can be made with designating the part number as shown below
RP400x xx1x-TR-F
↑
↑
↑
↑
↑
←Part
Number
a
Part
Number
a
b
c
d
e
Contents
Designation of the package
K：DFN(PLP)1820-6
N：SOT23-5
Designation of output voltage
00：Adjustable version (1.8V~5.0V)
*
recommended range of output voltage *DFN(PLP)1820-6 only
xx： Fixed version is possible in the range from 1.8V to 5.0V with a step of 0.1V
C：with CE pin
Designation of the taping type.(TR is standard)
F：Lead free plating (SOT-23-5,DFN(PLP)1820-6)
b
c
d
e
3
RP400x
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
•
N:SOT-23-5
【Version:C】
K: DFN(PLP)1820-6
(GND=0V)
RP400K001C
2
3
6
4
1
5
Symbol
CE
GND
V
OUT
Lx
V
IN
V
FB
Description
Chip Enable Pin (Active with ”H”)
Ground Pin
Output Pin
Internal NMOS Switch Drain Pin
Power Supply Pin
Feedback Input Pin for setting output voltage
Pin No.
RP400Nxx1C RP400Kxx1C
1
2
4
5
3
-
2
3
6
4
1
-
Tab is GND level. (They are connected to the reverse side of this IC.)
Do not connect to other wires or land patterns.
4
RP400x
ABSOLUTE MAXIMAM RATINGS
Symbol
V
IN
V
OUT
V
FB
V
LX
V
CE
ILx
P
D
Ta
Tstg
Items
V
IN
Supply Voltage
V
OUT
Pin Voltage
V
FB
Pin Voltage
Lx Pin Input Voltage
CE Pin Voltage
Lx Pin Output Current
Power Dissipation
Operating Temp Range
Storage Temp Range
SOT-23-5
DFN(PLP)1820-6
-40~+85
-55~+125
Ratings
-0.3~6.0
-0.3~6.0
-0.3~6.0
-0.3~6.0
-0.3~6.0
0.8
420
880
°C
°C
(GND=0V)
Unit
V
V
V
V
V
A
mW
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.
5
