The RP505 Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP505 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. The xx1A/B version with an internally fixed output voltage type and the 001C version with an externally adjustable output voltage type are available.
RP505 includes a soft start circuit, an under-voltage lockout circuit (UVLO), thermal shutdown circuit and a latch protection circuit. By simply using an inductor and capacitors (and resistors) 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 2mm square compact DFN(PLP)2020-8 package is available.
|Input Voltage Range (Maximum Rating)||2.3 V to 5.5 V (6.5V)|
|Supply Current||Typ. 40 µA (VFM mode with no-load)|
|Standby Current||Typ. 0 µA|
|Output Voltage Range||Ver.A,B||0.6 V to 3.3 V (Adjustable in 0.1 V steps.
Note: As for 0.8 V or less, input voltage range is limited.)
|Ver.C||0.8 V to 3.3 V|
|Output Voltage Accuracy||Ver.A,B||±1.5% (VOUT≥1.2V), ±18mV (VOUT<1.2V)|
|Feedback Voltage Accuracy||Ver.C||±9 mV (VFB=0.6V)|
|Temperature-Drift Coefficient of Output Voltage/ Feedback||±100 ppm/°C|
|Oscillator Frequency||Typ. 2.25 MHz|
|Oscillator Maximum Duty Cycle||Min. 100%|
|Built-in Driver ON Resistance||Typ. Pch. 0.23 Ω, Nch. 0.20 Ω (VIN=3.6V)|
|UVLO Detector Threshold||Typ. 2.0 V|
|Soft-start Time||Typ. 0.15 ms|
|Lx Current Limit Circuit||Typ. 1.7 A|
|Latch Type Protection Circuit||Typ. 1.5 ms|
RP505K331x Efficiency vs. Output Current
|8||VOUT or VFB|
*) The tab is substrate level (GND).
**) No.3 pin and No.4 pin, No.6 pin and No.7 pin must be wired together when it is mounted on board.
PRODUCT LONGEVITY PROGRAM
RP505 series operate PRODUCT LONGEVITY PROGRAM (ten-year supply is maintained as of January, 2016).
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.
In the RP505 Series, output voltage, and auto discharge function for the IC are selectable at the user’s request.
|Product Name||Package||Quantity per Reel|
* Auto-discharge function quickly lowers the output voltage to 0V, 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.