RP400xxx1B SERIES
HIGH EFFICIENCY, SMALL PACKAGES, STEP-UP DC/DC CONVERTERS
NO.EA-193-150909
OUTLINE
RP400xxx1B 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.0.7V) operation from one to two alkaline or a
nickel-metal-hydride (NiMH) or one-cell Lithium-ion (Li+) battery.
This IC consists of a reference voltage unit with soft start, 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. As a protection circuit, RP400xxx1B has a current limit circuit which limits the peak current of the
inductor at each clock cycle.
A low ripple high efficiency step up DC/DC converter can be composed of RP400xxx1B Series with only an
inductor, a diode and capacitors. This converter is based on a fixed frequency current mode PWM control which
goes to power save mode (VFM mode) at light load automatically. RP400xxx1B 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 RP400K001B can be set within 1.8~5.0V (recommended range of output voltage) by
external divider resistors.
FEATURES
●
Low Start-up Voltage guaranteed ························0.7V
●
Input Voltage Range ········································0.7V ~ 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 Phase Compensation, Soft Start, Peak Current Limit Protection
●
PWM Oscillator Frequency ································700kHz
●
Output Voltage Range ······································Fixed: 1.8V to 5.0V with 0.1V Stepwise
Adjustable: 1.8V ~ 5.0V (RP400K001B only)
(Recommended range of output voltage)
●
Stable with Ceramic Capacitors
●
Small Package ···············································DFN(PLP)1820-6, SOT-23-5
●
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
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RP400xxx1B
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
RP400Kxx1B-TR
RP400Nxx1B-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
RP400xxx1B
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
RP400K001B: DFN(PLP)1820-6
Pin No
1
2
3
4
5
6
Symbol
V
IN
NC
GND
Lx
V
FB
V
OUT
Power Supply Pin
No Connection
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.
RP400Kxx1B: DFN(PLP)1820-6
Pin No
1
2
3
4
5
6
Symbol
V
IN
NC
GND
Lx
NC
V
OUT
Power Supply Pin
No Connection
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.
RP400Nxx1B: SOT-23-5
Pin No
1
2
3
4
5
Symbol
NC
GND
V
IN
V
OUT
Lx
No Connection
Ground Pin
Power Supply Pin
Output Pin
Internal NMOS Switch Drain Pin
Pin Description
4
RP400xxx1B
ABSOLUTE MAXIMAM RATINGS
(GND=0V)
Symbol
V
IN
V
OUT
V
LX
V
FB
I
LX
P
D
Ta
Tstg
Items
V
IN
Supply Voltage
V
OUT
Pin Voltage
Lx Pin Input Voltage
V
FB
Pin Voltage
Lx Pin Output Current
Power Dissipation *
Ambient Temp Range
Storage Temp Range
SOT-23-5
DFN(PLP)1820-6
RP400K001B
Ratings
-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0
0.8
420
880
-40 to + 85
-55 to + 125
Unit
V
V
V
V
A
mW
°C
°C
* For Power Dissipation, please 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 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.
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