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RP550 Series
Dual 1A PWM/VFM Step-down DCDC Converter with Synchronous Rectifier

Product Specifications

The RP550 Series are dual output CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP550 can be selected from two control types by input signal to the MODE pin - forced PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current.

RP550 includes a soft start circuit, an under-voltage lockout circuit (UVLO), thermal shutdown circuit and a latch protection circuit. By simply using an inductor, resistors and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (2.2µH) and output capacitor (10µF) can be used by the switching of 2.25MHz. A 2.7mm×3.0mm square compact DFN(PLP)2730-12 package is available.

FEATURES

Input Voltage Range (Maximum Rating) 2.3 V to 5.5 V (VSET≥0.8 V) (6.5 V)
Supply Current Typ. 45 µA (VFM mode with no load/ 1 channel)
Standby Current Typ. 0 µA
Output Voltage Range Adjustable from 0.6 V (Recommended range is up to 3.3 V)
Feedback Voltage Accuracy ±9 mV (VFB=0.6V)
Output Voltage Temperature Coefficient ±100 ppm/°C
Oscillator Frequency Typ. 2.25 MHz
Oscillator Maximum Duty Min. 100%
Built-in Driver ON Resistance Typ. Pch. 0.25 Ω, Nch. 0.21 Ω (VIN=3.6V)
UVLO Detector Threshold Typ. 2.0 V
Soft Start Time Typ. 0.2 ms
Lx Current Limit Circuit Typ. 1700 mA/ channel
Latch Type Protection Circuit Typ. 1.5 ms
Package DFN(PLP)2730-12

APPLICATION INFORMATION

RP550K001A

TYPICAL CHARACTERISTICS

RP550K001A (VOUT=3.3V)
Efficiency vs. Output Current

PIN DESCRIPTION

DFN(PLP)2730-12

DFN(PLP)2730-122.7 mm × 3.0 mm
1 VFB2
2 MODE
3 VIN**
4 VIN**
5 AGND**
6 VFB1
7 CE1
8 Lx1
9 PGND1**
10 PGND2**
11 Lx2
12 CE2

*) The tab is substrate level (GND).
**) No.3 pin and No.4 pin, No.5 pin and No.9 pin and No.10 pin must be wired together when it is mounted on board.


RP550 Series for Consumer

APPLICATIONS

  • Power source for battery-powered equipment
  • Power source for hand-held communication equipment, cameras, and VCRs
  • Power source for Wireless LAN terminals

PRODUCT LONGEVITY PROGRAM

RP550 series operate PRODUCT LONGEVITY PROGRAM.
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


SELECTION GUIDE

Product Name   Package Quantity per Reel
RP550K001A-TR ConsumterPLP DFN(PLP)2730-12 5,000

Output voltage is adjustable with external divider resistors.
Recommended output voltage range is from 0.6V to 3.3V.

DOCUMENT/CONTACT

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Technical Support

Package *1 Marking Reliability *2
DFN(PLP)2730-12 RP550K RP550K

*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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