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, VIN = 1.5V, 25°C)
● Output current ················································200mA / 3.3V (VIN = 1.5V) Typ.100mA / 2.0V (VIN = 1.2V)
● Internal Switch················································NMOS = 0.4Ω (VOUT = 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
1
RP400xxx1B
BLOCK DIAGRAMS
1. Adjustable Output: RP400K001B
Lx
VIN
S tartup
C irc uit
C ontrol
Logic
B uffe r
C urrent
S ens e
PW M
C ontrol
V O UT
E rro rA m p
f os c
O sc
VFB
+
V ref
VF M C on tro l
GND
2. Fixed Output: RP400xxx1B
Lx
VIN
S tartup
C ircu it
C ontrol
Logic
B uff er
C u rren t
S ens e
PW M
C ontrol
E rro rA m p
fos c
O sc
+
V F M C on trol
V ref
GND
2
V O UT
-
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
Quantity per Reel
Pb Free
Halogen Free
DFN (PLP)1820-6
5,000 pcs
Yes
Yes
SOT-23-5
3,000 pcs
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
1
5
2
4
3
4
1
(Bottom View)
2
3
(Top View)
PIN DESCRIPTION
RP400K001B: DFN(PLP)1820-6
Pin No
Symbol
Pin Description
1
VIN
Power Supply Pin
2
NC
No Connection
3
GND
4
Lx
Internal NMOS Switch Drain Pin
5
VFB
Feedback Input Pin for setting output voltage
6
VOUT
Output Pin
Ground Pin
* 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
Symbol
Pin Description
1
VIN
Power Supply Pin
2
NC
No Connection
3
GND
4
Lx
Internal NMOS Switch Drain Pin
5
NC
No Connection
6
VOUT
Output Pin
Ground Pin
* 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
4
Pin No
Symbol
1
NC
2
GND
3
VIN
4
VOUT
5
Lx
Pin Description
No Connection
Ground Pin
Power Supply Pin
Output Pin
Internal NMOS Switch Drain Pin
RP400xxx1B
ABSOLUTE MAXIMAM RATINGS
(GND=0V)
Symbol
Ratings
Unit
VIN Supply Voltage
-0.3 to 6.0
V
VOUT
VOUT Pin Voltage
-0.3 to 6.0
V
VLX
Lx Pin Input Voltage
-0.3 to 6.0
V
VFB
VFB Pin Voltage
ILX
Lx Pin Output Current
PD
Power Dissipation *
Ta
Ambient Temp Range
-40 to + 85
°C
Tstg
Storage Temp Range
-55 to + 125
°C
VIN
Items
RP400K001B
-0.3 to 6.0
0.8
V
A
SOT-23-5
420
DFN(PLP)1820-6
880
mW
* 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.
5
RP400xxx1B
ELECTRICAL CHARACTERISTICS
(Ta=25C)
Symbol
VIN
Conditions
Start-up Voltage 1
Load current =1mA
Vhold1
Hold-on Voltage 1
(Once started)
Load current=1mA
IDD2
VFB
VOUT
∆VOUT
/∆Ta
fosc
∆fosc
/∆Ta
RONN
TYP.
Feedback Voltage
(Adjustable Version)
Output-Voltage
(Fixed Version)
Output-Voltage
Temperature Coefficient
Switching Frequency
Switching Frequency
Temperature Coefficient
NMOS
On-Resistance (*1)
Unit
5.5
V
0.9
V
0.7
V
VIN=3V
VOUT=5V
VFB=0V
500
800
A
Fixed Version.
VIN=0.5VOUT
VOUT= 0.95VOUT
VOUT
100
(*3)
A
Adjustable Version
VIN=VOUT=5V
VFB=1.0V
160
300
A
Fixed Version
VIN=VOUT=5V
160
300
A
0.600
0.612
V
1.02
V
Quiescent Current 1
Quiescent Current 2
(No switching)
0.7
MAX.
Adjustable Version
VIN=VOUT=3.3V
0.588
VIN= 1.5V
0.98
-40°C≤Ta≤85°C
ppm
/°C
±100
Adjustable Version
VIN=VOUT=3.3V
595
700
805
kHz
Fixed Version.
VIN=VOUT=0.95VOUT
595
700
805
kHz
-40°C≤Ta≤85°C
±0.2
kHz
/°C
VOUT=3.3V
0.4
Ω
IFBH
FB ”H” Input Current
(Adjustable Version)
VIN=VOUT=VFB=5V
IXFBL
FB ”L” Input Current
(Adjustable Version)
VIN=VOUT=5V
VFB=0V
ILxpeak
MIN.
Input Voltage
Vstart1
IDD1
6
Item
0.5
A
A
-0.5
Adjustable Version
VOUT=3.3V
Detective at
Duty=MaxDuty-5%
0.4
0.6
A
Fixed Version.
VOUT= 0.95VOUT
Detective at
Duty=MaxDuty-5%
0.4
0.6
A
Lx Leak Current limit (*2)
RP400xxx1B
ELECTRICAL CHARACTERISTICS (cont.)
(Ta=25C)
Symbol
Maxduty
tstart
RONA
Item
Max Duty
Conditions
TYP.
MAX.
Unit
Adjustable Version
VIN=VOUT=3.3V
VFB=0V
80
88
95
%
Fixed Version.
VIN=VOUT=0.95VOUT
80
88
95
%
Adjustable Version
VIN=0V to 1.65V
VOUT=3.3V
At VOUT=2.97V
0.08
0.7
3.0
ms
Fixed Version.
VIN= 0V to VOUT 0.5
At VOUT=VOUT0.9
0.08
0.7
3.0
ms
Adjustable Version
VIN=VOUT=3.3V
110
Ω
Fixed Version.
VIN=VOUT=1.05VOUT
110
Ω
Soft Start period
Anti-ringing switch
On Resistance
MIN.
*1) Guaranteed by design engineering. NMOS On-Resistance according to the VOUT voltage.
*2) Lx limit current changes by Duty.
*3) The maximum value of Operating Current 1(Fixed Version) is shown on the table below.
VOUT (V)
1.8 V
1.9 V
2.0 V
2.1 V
2.2 V
2.3 V
2.4 V
2.5 V
2.6 V
2.7 V
2.8 V
2.9 V
3.0 V
3.1 V
3.2 V
3.3 V
3.4 V
MAX (A)
290
310
320
340
360
370
390
400
420
440
450
470
480
500
520
530
550
VOUT (V)
3.5 V
3.6 V
3.7 V
3.8 V
3.9 V
4.0 V
4.1 V
4.2 V
4.3 V
4.4 V
4.5 V
4.6 V
4.7 V
4.8 V
4.9 V
5.0 V
MAX (A)
560
580
600
610
630
640
660
680
690
710
720
740
760
770
790
800
7
RP400xxx1B
APPLICATION NOTES
Adjustable Output Voltage Type (Version:B)
Schottky Diode
VOUT
1.8V to 5V
L
10H(6.8H)
V IN
CIN
10F
Lx
RP400K001B
V OUT
COUT
10F
GND
R2
V FB
R1
Fixed Output Voltage Type (Version:B)
Schottky Diode
VOUT
1.8V to 5V
L
10H(6.8H)
V IN
CIN
10F
Lx
RP400xxx1B
V OUT
COUT
10F
GND
External components
Capacitor
Diode
Inductor
8
: C2012JB1C106M (TDK)
: CRS10I30A (TOSHIBA)
: TDK SLF7045T-100M1R3-PF(TDK)
RP400xxx1B
● Setting of Output Voltage
Output voltage (1.8V to 5.0V recommended range of voltage) can be set with divider resistors for voltage setting,
R1 and R2 as shown in the typical application. Refer to the next formula.
Output Voltage = VFB (R1 + R2) / R1
(VFB = 0.6V)
Recommended value of resistors (R1 + R2) is lower than 100kΩ.
Make sufficient power supply and ground and reinforce supplying. The large switching current could flow
through the connection of power supply, inductor, ground, diode and the connection of VOUT. If the impedance of
the connection of power supply and ground is high, the voltage level of power supply of the IC fluctuates with the
switching current. We recommend you to use output capacitor and diode with an allowable voltage at least 1.5
times as much as setting output voltage. This is because there may be case where a spike-shaped high voltage is
generated by an inductor when built-in transistor is on and off.
Use a diode of a Schottky type with high switching speed, low reverse current and also pay attention to its
current capacity.
Set external components as close as possible to the IC and minimize the connection between the components
and the IC. In particular, output capacitor should be connected to VOUT pin with IC ground by the minimum
connection, because this IC uses the VOUT voltage as the main power supply, after start-up. Use capacitors with a
capacity of 10F or more for VOUT pin. We recommend you to set a ceramic capacitor (10F) between VIN and
ground.
The divider resistors should be placed as close as possible to the IC ground pin. VFB line is recommended to
use short line as well to avoid the influence of noise.
Please select the inductor value 10H in the case of VOUT≧2.5V and 6.8H in the case of VOUT
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