RP400xxx1C SERIES
HIGH EFFICIENCY, SMALL PACKAGES, STEP-UP DC/DC CONVERTERS
NO.EA-193-100317
OUTLINE
RP400xxx1C Series 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.1.2V) operation from two alkaline 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 RP400xxx1C Series 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 Series has built-in Anti-ringing Switch to prevent switching node from
ringing, when the converter enters the discontinuous current mode.
The 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
●
Portable blood pressure meter
●
Wireless Handset
●
GPS
1
RP400xxx1C Series
BLOCK DIAGRAMS
1. 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. 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
RP400xxx1C Series
SELECTION GUIDE
Output Voltage, Type of Output Voltage, and package for the ICs can be selected at the user’s request.
Product Name
RP400Kxx1C-TR
RP400Nxx1C-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 ~ 5.0V)
*
recommended range of output voltage / DFN(PLP)1820-6 only
Fixed version is possible in the range from 1.8V to 5.0V with a step of 0.1V
3
RP400xxx1C Series
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
RP400K001C: 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 Pin for setting output voltage
Output Pin
Pin Description
* Tab is GND level. (They are connected to the reverse side of this IC.) The tab is better to be connected to the GND, but
leaving it open is also acceptable.
RP400Kxx1C: DFN(PLP)1820-6
Pin No
1
2
3
4
5
6
Symbol
V
IN
CE
GND
Lx
NC
V
OUT
Power Supply Pin
Chip Enable Pin (Active with ”H”)
Ground Pin
Internal NMOS Switch Drain Pin
No Connection
Output Pin
Pin Description
* Tab is GND level. (They are connected to the reverse side of this IC.) The tab is better to be connected to the GND, but
leaving it open is also acceptable.
RP400Nxx1C: 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 with ”H”)
4
RP400xxx1C Series
ABSOLUTE MAXIMAM RATINGS
Symbol
V
IN
V
OUT
V
FB
V
LX
V
CE
I
LX
P
D
Ta
Tstg
Items
V
IN
Supply Voltage
V
OUT
Pin Voltage
V
FB
Pin Voltage
Pin Input Voltage
CE Pin Voltage
Lx Pin Output Current
Power Dissipation
Operating Temp Range
Storage Temp Range
Ratings
-0.3 ~ 6.0
-0.3 ~ 6.0
-0.3 ~ 6.0
-0.3 ~ 6.0
RP400K001A
-0.3 ~ 6.0
0.8
SOT-23-5
420
DFN(PLP)1820-6
880
-40 ~ + 85
-55 ~ + 125
(GND=0V)
Unit
V
V
V
V
V
A
mW
°C
°C
*) For Power Dissipation, please refer to PACKAGE INFORMATION to be described.
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.
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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