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RP401 Series
1A PWM/VFM Step-up DCDC Converter

Product Specifications

The RP401 Series are CMOS-based PWM/VFM step-up DC/DC converters which can start-up from Typ. 0.6V. RP401 can be switched from two control types by inputting signal to the MODE pin - fixed PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. (RP401N Series can be selected from fixed PWM control or PWM/VFM auto switching control.)

RP401 includes a soft start circuit. By simply using an inductor, a capacitor, (resisters for adjustable type), and a diode as external components, a high-efficiency step-up DC/DC converter can be easily configured. The output voltage can be selected from the internally fixed or the externally adjustment. In addition to SOT-23-5 package, a 1.8mm × 2.0mm square DFN(PLP)1820-6 package is also available.

FEATURES

Input Voltage Range (Maximum Rating) 0.6 V to 5.5 V (6.0 V)
Start-up Voltage Typ. 0.6 V
Supply Current 1 Typ. 400 μA (VSET=3.0 V, Switching)
Supply Current 2 Typ. 130 μA (No switching, VFM)
Typ. 230 μA (No switching, PWM)
Standby Current Typ. 0.15 μA (CE="L")
Hold-on Voltage Min. 0.6 V
Output Voltage Range 1.8 V to 5.5 V (Internally fixed) (xx1)
Externally adjustable (Feedback voltage : 0.6 V) (001C/D)
Output Voltage Accuracy ±2%
Oscillator Frequency 1.2 MHz
Oscillator Maximum Duty Cycle Min. 80%, Typ. 88%
Coil-current Limit Circuit Current Limit Typ.1 A*
Soft Start Time Typ. 0.7 ms
Latch Protection Circuit Delay time for protection Typ. 3.3 ms (A Version only)
MODE pin "H" : fixed PWM control,
"L" : PWM/VFM auto switching control (A/B Version)
Packages DFN(PLP)1820-6, SOT-23-5

*) This is an approximate value, because ON duty depends on conditions

APPLICATION INFORMATION

RP401Kxx1A/B
(Internally fixed output Voltage type)

RP401K001C/D
(Externally adjustable output voltage type)

TYPICAL CHARACTERISTICS

RP401x331x / RP401K001x (VOUT=3.3V) Efficiency vs. Output Current

PWM/VFM auto switching control

Fixed PWM control

PIN DESCRIPTION

DFN(PLP)1820-6

DFN(PLP)1820-61.8 mm × 2.0 mm
  xx1A/B 001C/D
1 VIN VIN
2 CE CE
3 GND GND
4 Lx Lx
5 MODE VFB
6 VOUT VOUT

*) The tab is substrate level (GND).

SOT-23-5

SOT-23-52.9 mm × 2.8 mm
  001C/D
1 CE
2 GND
3 VIN
4 VOUT
5 Lx

RP401 Series for Consumer

APPLICATIONS

  • MP3 players, PDA, cellular phones
  • Digital Still Cameras
  • LCD Bias Supplies
  • Portable Blood Pressure Meter
  • Wireless Handset
  • GPS

SELECTION GUIDE

In the RP401 Series, Output Voltage, Type of Output Voltage, and package for the ICs can be selected at the user’s request.

Product Name   Package Quantity per Reel
RP401Kxx1# -TR Consumter DFN(PLP)1820-6 5,000
RP401K001$-TR
RP401Nxx1$-TR-FE Consumter SOT-23-5 3,000
  • xx … Specify the output voltage within the range of 1.8V (18) to 5.5V (55) in 0.1V steps
  • 00 … Specify the output voltage external adjustable within the recommendation range of 1.8V to 5.5V.
  • # … A: with MODE pin, with Latch protection circuit
    B: with MODE pin, without Latch protection circuit
  • $ … C: PWM/VFM auto switching, without Latch protection circuit
    D: fixed PWM, without Latch protection circuit

DOCUMENT/CONTACT

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Technical Support

Package *1 Marking Reliability *2
DFN(PLP)1820-6 RP401K RP401K
SOT-23-5 RP401N RP401N (-FE)

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.

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