RP400Xxx1C SERIES
High Efficiency and Tiny Step-Up DC/DC Converters
NO.EA-193-090130
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
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：applied to SOT-23-5 (lead free-plating)
b
c
d
e
3
PCB设计
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