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RP508 Series
600mA 6MHz PWM/VFM Step-down DCDC Converter with Synchronous Rectifier

Product Specifications

The RP508 Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier featuring 600mA* output current. The power controlling method can be selected from forced PWM control type or PWM/VFM auto switching control type by inputting a signal to the MODE pin.

The RP508 includes a soft start circuit, an under-voltage lockout circuit (UVLO), a thermal shutdown circuit, and an auto-discharge function. The RP508 requires only a small numbers of external components to configure a high-efficiency step-up DC/DC converter: an inductor, capacitors and a diode as external components. The high-speed response corresponding to the high-speed switching frequency of 6MHz. The small-sized inductors (1.6 x 0.8 mm, 0.47µH) can be used. A 1.2-mm square compact DFN(PLP)1212-6F package is available.

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

FEATURES

Input Voltage Range (Maximum Rating) 2.3 V to 5.5 V (6.5V)
Output Voltage Range (VOUT) 0.8 V to 3.3 V (0.1 V steps)
Supply Current Typ. 15 µA (VFM Mode with No-load)
Standby Current Typ. 0 µA
Output Voltage Temperature Coefficient Typ. ±100 ppm/°C
Oscillator Frequency Typ. 6.0 MHz
Maximum Duty Cycle 100%
Built-in Driver ON Resistance Typ. Pch. 0.33 Ω, Nch. 0.24 Ω (VIN = 3.6 V)
UVLO Detector Threshold Typ. 2.0 V
Soft-start Time Typ. 90 µs
Lx Current Limit Circuit Typ. 1.1 A
Output Voltage Accuracy ±1.5% (VOUT ≥ 1.2V) or ±18 mV (VOUT < 1.2V)
Package DFN(PLP)1212-6F

APPLICATION INFORMATION

TYPICAL CHARACTERISTICS

Efficiency vs. Output Current
RP508K181x VOUT=1.8V

Efficiency vs. Output Current
RP508K181x VOUT=3.3V

PIN DESCRIPTION

DFN(PLP)1212-6F

DFN(PLP)1212-6F1.2 mm × 1.2 mm
1 VOUT
2 MODE
3 CE
4 VIN
5 Lx
6 GND

RP508 Series for Consumer

APPLICATIONS

  • Cellular Phones
  • Smartphones
  • Digital Still Camera
  • Notebook PCs, PDA’s
  • Li-ion Battery-used Equipment

PRODUCT LONGEVITY PROGRAM

RP508 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

The set output voltage and the auto discharge function are user-selectable options.

Product Name   Package Quantity per Reel
RP508Kxx1$-TR ConsumterPLP DFN(PLP)1212-6F 5,000
  • xx … Specify the set output voltage (VSET) within the range of 0.8 V (08) to 3.3 V (33) in 0.1 V steps. (0.05 V step is also available as a custom code.)
    If the set output voltage includes the 3rd digit, indicate the digit of 0.01.
    (1.05 V, 1.25 V, 1.35 V)
    Ex. If the set output voltage is 1.05 V: RP508K101$5
    If the set output voltage is 1.25 V: RP508K121$5
    If the set output voltage is 1.35 V: RP508K131$5
  • $ … Specify the auto-discharge option.
    A: Fixed output voltage type
    B: Fixed output voltage type, auto-discharge function in shutdown mode

* 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

Purchase

Technical Support

Package *1 Marking Reliability *2
DFN(PLP)1212-6F RP508K RP508K

*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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