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RP501 Series
1A PWM/VFM Step-down DCDC Converter with Synchronous Rectifier

Product Specifications

The RP501 Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP501 can be selected from two control types by input 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. RP501 includes a soft start circuit, an under-voltage lockout circuit (UVLO), and a latch protection circuit. By simply using an inductor and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (2.2µH) can be used by the switching of 2.25MHz. The frequency accuracy improved to ±10%.

FEATURES

Input Voltage Range (Maximum Rating) 2.5 V to 5.5 V (6.5V)
Supply Current Typ. 450 µA (No switching, PWM)
Typ. 140 µA (No switching, VFM)
Standby Current Typ. 0 µA (CE="L")
Output Voltage Range 1.0 V to 3.3 V (Internally fixed)
Output Voltage Accuracy ±1.5%
Output Current 1 A*
Oscillator Frequency 2.25 MHz
Oscillator Maximum Duty Cycle Min. 100%
UVLO Detector Threshold Typ. 2.2 V
Soft Start Time Typ. 0.14 ms
Coil-current Limit Circuit Current limit Typ. 1.5 A
Latch Protection Circuit Delay time for protection Typ. 2 ms
Auto-discharge Function B Version
MODE Pin "H": PWM/VFM auto switching control, "L": fixed PWM control
Package DFN(PLP)2527−10

*) This is an approximate value, because output current depending on conditions and external parts.

APPLICATION INFORMATION

RP501K

TYPICAL CHARACTERISTICS

RP501K331x (PWM/VFM auto switching control)
Efficiency vs. Output Current

PIN DESCRIPTION

DFN(PLP)2527-102.5 mm × 2.7 mm

DFN(PLP)2527-10

1 CE
2 TEST1**
3 AGND
4 PGND
5 Lx
6 PVIN
7 TEST2**
8 MODE
9 AVIN
10 VOUT

*) The tab is substrate level (GND).
**) TEST pins must be connected to GND.


RP501 Series for Consumer

APPLICATIONS

  • Power source for portable equipment such as cellular, PDA, DSC, Notebook PC
  • Power source for HDD, WLAN, Car accessories
  • Power source for Li-ion battery-used equipment

SELECTION GUIDE

In the RP501 Series, output voltage and version can be designated with user's request.

Product Name   Package Quantity per Reel
RP501Kxx1#-TR Consumter DFN(PLP)2527−10 5,000
  • xx … Designation of output voltage(VOUT):
    Designation is possible in the range from 1.0V to 3.3V with a step of 0.1V. (0.05V step is also available as a custom code.)
  • $ … Designation of Active Type
    A: without auto-discharge function
    B: with auto-discharge function

* Auto-discharge function quickly lowers the output voltage to 0 V, when the chip enable signal is switched from the active mode to the standby mode, by releasing the electrical charge accumulated in the external capacitor.

DOCUMENT/CONTACT

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Technical Support

Package *1 Marking Reliability *2
DFN(PLP)2527-10 RP501K RP501K

*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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