RP400x SERIES
High Efficiency , Small Packages, Step-Up DC_DC Converters
NO.EA-193-080324
OUTLINE
RP400xseries are high efficiency, step-up DC-DC converter ICs packaged in compact 5pin SOT23 or 6pin
DFN(PLP). This converter starts up of low voltage(typ. 0.8V) operation from one to two alkaline or
nickel-metal-hydride (NiMH) battery, or a single Li+ battery.
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. RP400xseries has built-in Anti-ringing Switch to prevent
switching node from ringing, when the converter enters the discontinuous current mode.
Output voltage can be set within 1.8~5.0V (recommended range of output voltage) by external divider
resistors.
FEATURES
●
Low Start-up Voltage guaranteed ······················· 0.9V
●
Input Voltage Range ··········································· 0.9V~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
=0.9V)
●
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
(under
Adjustable: 1.8V~5.0V (RP400K001 only)
(recommended range of output voltage)
●
Stable with Ceramic Capacitors
●
Small Package···················································· DFN(PLP)1820-6, SOT23-5
(SOT23-5 is under development)
●
Internal EMI suppression (Anti-ringing switch is included)
½evelopment
)
APPLICATIONS
●
MP3 players, PDA
●
Digital Still Cameras
●
LCD Bias Supplies
●
Personal Medical Equipments
●
Wireless Handset
●
GPS
1
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
b
Designation of the package
K：DFN(PLP)1820-6
N：SOT23-5
(under development)
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
(under development)
c
d
e
A：with CE pin
B：without CE pin
(under development)
Designation of the taping type.(TR is standard)
F: Lead free plating(DFN(PLP)1820-6)
4
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)
(under development)
PIN DESCRIPTION
•
N:SOT-23-5
(under development)
K: DFN(PLP)1820-6
【Version:
A】
Pin No.
RP400Nxx1A RP400Kxx1A RP400K001A Symbol
(under
development)
(under
development)
(GND=0V)
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
1
2
4
5
3
-
2
3
6
4
1
-
2
3
6
4
1
5
CE
GND
V
OUT
Lx
V
IN
V
FB
【Version:
B】
(under development)
Pin No.
RP400Nxx1B RP400Kxx1B
1
2
2
3
4
6
5
4
3
1
-
-
(GND=0V)
RP400K001B
2
3
6
4
1
5
Symbol
NC
GND
V
OUT
Lx
V
IN
V
FB
Description
No connect
Ground pin
Output pin
Internal NMOS Switch Drain Pin
Power Supply Pin
Feedback Input Pin for setting output voltage
Tab is GND level. (They are connected to the reverse side of this IC.)
Do not connect to other wires or land patterns.
5
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