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RP504 Series
600mA PWM/VFM Step-down DCDC Converter with Synchronous Rectifier

Product Specifications

The RP504 Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP504K/L can be switched from two control types by inputting 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. (RP504N Series can be selected from forced PWM control or PWM/VFM auto switching control.)

RP504 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) and output capacitor (4.7µH) can be used by the switching of 2.25MHz. In addition to SOT-23-5 and DFN1616-6B packages, a 1.2mm × 1.6mm DFN(PLP)1216-6F package is also available.

FEATURES

Input Voltage Range (Maximum Rating) 2.3 V to 5.5 V (VOUT≥1.0V) (6.5V)
Supply Current Typ. 25 µA in VFM mode without any load
Standby Current Typ. 0 µA
Output Voltage Range 0.8 V to 3.3 V in 0.1 V step
Output Voltage Accuracy ±1.5% (VOUT ≥ 1.2 V), ±18 mV (VOUT < 1.2 V)
Temperature-Drift Coefficient of Output Voltage Typ. ±40 ppm/°C
Oscillator Frequency Typ. 2.25 MHz
Oscillator Maximum Duty Cycle Min. 100%
Built-in Driver ON Resistance Typ. Pch. 0.34 Ω, Nch. 0.43 Ω (VIN = 3.6 V)
UVLO Detector Threshold Typ. 2.0 V
Soft Start Time Typ. 0.15 ms
Lx Current Limit Typ. 900 mA
Latch-type Protection Circuit Typ. 1.5 ms
Auto-discharge Function Only for RP504xxxxD
Power Controlling Method forced PWM control or PWM/VFM auto switching control
MODE Pin* "H": forced PWM control,
"L": PWM/VFM auto switching control
Packages* DFN1616-6B, DFN(PLP)1216-6F, SOT-23-5

*) DFN(PLP)1216-6F, DFN1616-6B: forced PWM control by pulling MODE pin "H" or PWM/VFM auto switching control by pulling MODE pin "L"
SOT-23-5: forced PWM control for RP504xxxxC and PWM/VFM auto switching control for RP504xxxxB

APPLICATION INFORMATION

RP504L/K

TYPICAL CHARACTERISTICS

RP504x331x Efficiency vs. Output Current

PIN DESCRIPTION

DFN(PLP)1212-6F1.2 mm × 1.2 mm

DFN(PLP)1212-6F

1 VIN
2 MODE
3 CE
4 VOUT
5 GND
6 Lx
DFN1616-6B1.6 mm × 1.6 mm

DFN1616-6B

1 CE
2 MODE
3 VIN
4 Lx
5 GND
6 VOUT

*) The tab is substrate level (GND).

SOT-23-52.9 mm × 2.8 mm

SOT-23-5

1 VOUT
2 GND
3 Lx
4 VIN
5 CE

RP504 Series for Consumer

APPLICATIONS

  • Power source for battery-powered equipment
  • Power source for hand-held communication equipment, cameras, VCRs, camcorders
  • Power source for HDD, portable equipment

SELECTION GUIDE

The set output voltage, the package type, the MODE control pin function and the auto-discharge function are user-selectable options.

Product Name   Package Quantity per Reel
RP504Kxx1#-E2 Consumter DFN(PLP)1212-6F 5,000
RP504Lxx1#-TR Consumter DFN1616-6B 5,000
RP504Nxx1$-TR-FE Consumter SOT-23-5 3,000
  • 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.)
  • # … A: with MODE pin, without auto-discharge function
    D: with MODE pin, with auto-discharge function
  • $ … B: PWM/VFM auto switching control, without auto-discharge function
    C: forced PWM control, without 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)1212-6F RP504K RP504K
DFN1616-6B RP504L RP504L
SOT-23-5 RP504N RP504N (-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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