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RP502 Series
600mA PWM/VFM Step-down DCDC Converter with Synchronous Rectifier

Product Specifications

The RP502 Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP502 can be selected from two control types - fixed PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. RP502 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 (1.0µH/2.2µH) and small output capacitor (4.7µF) can be used by the switching of 3.3MHz.

FEATURES

Input Voltage Range (Maximum Rating) 2.5 V to 5.5 V (VOUT≥1.0V) (6.0V)
2.5 V to 4.5 V (VOUT<1.0V) (6.0V)
Supply Current Typ. 750 µA (at normal)
Typ. 180 µA (at light road)
Output Voltage Range 0.8 V to 3.3 V (0.1V steps)
Output Voltage Accuracy ±1.5% (VOUT≥1.6V), ±24 mV (VOUT<1.6V)
Oscillator Frequency Typ. 3.3 MHz
Maximum Duty Min. 100%
Built-in Driver ON Resistance Typ. Pch 0.5 Ω, Nch 0.5 Ω (VIN = 3.6V)
UVLO Detector Threshold Typ. 2.2 V
Soft Start Time Typ. 0.12 ms
Lx Current Limit Typ. 900 mA (VOUT≥1.2V), Typ. 800 mA (VOUT<1.2V)
Latch type Protection Circuit Typ. 1.5 ms
Packages WLCSP-6-P2, DFN1616-6

APPLICATION INFORMATION

RP502x

TYPICAL CHARACTERISTICS

RP502x291B/293B (PWM/VFM auto switching control)
Efficiency vs. Output Current

PIN DESCRIPTION

WLCSP-6-P21.29 mm × 0.87 mm

WLCSP-6-P2

A1 VOUT
B1 PGND
C1 Lx
A2 CE
B2 AGND
C2 VIN
DFN1616-61.6 mm × 1.6 mm

DFN1616-6

1 CE
2 AGND
3 VIN
4 Lx
5 PGND
6 VOUT

*) The tab is substrate level (GND).


RP502 Series for Consumer

APPLICATIONS

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

SELECTION GUIDE

In the RP502 Series, output voltage, switching mode, and auto discharge function for the ICs are selectable at the user’s request.

Product Name   Package Quantity per Reel
RP502Zxx#B-E2-F Consumter WLCSP-6-P2 5,000
RP502Lxx#B-TR Consumter DFN1616-6 5,000
  • xx … The output voltage can be designated in the range of 0.8V(08) to 3.3V(33) in 0.1V steps. (0.05 V step is also available as a custom code.)
  • # … The switching mode and auto discharge function can be designated.
    1: PWM/VFM auto switching control, without auto-discharge function
    2: fixed PWM control, without auto-discharge function
    3: PWM/VFM auto switching control, with auto-discharge function
    4: fixed PWM control, 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
WLCSP-6-P2 RP502Z RP502Z
DFN1616-6 RP502L RP502L

*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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